CDP

cdp-202602050000860546false00008605462026-02-052026-02-05

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 5, 2026

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On February 5, 2026, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended December 31, 2025 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended December 31, 2025.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:February 5, 2026

cdp-202510300000860546false00008605462025-10-302025-10-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 30, 2025

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On October 30, 2025, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended September 30, 2025 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended September 30, 2025.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:October 30, 2025

ofc-202507280000860546false00008605462025-07-282025-07-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 28, 2025

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On July 28, 2025, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended June 30, 2025 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended June 30, 2025.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:July 28, 2025

ofc-202504280000860546false00008605462025-04-282025-04-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 28, 2025

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On April 28, 2025, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended March 31, 2025 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended March 31, 2025.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:April 28, 2025

ofc-202502060000860546false00008605462025-02-062025-02-06

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 6, 2025

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On February 6, 2025, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended December 31, 2024 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended December 31, 2024.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:February 6, 2025

ofc-202410280000860546false00008605462024-10-282024-10-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): October 28, 2024

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On October 28, 2024, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended September 30, 2024 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended September 30, 2024.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:October 28, 2024

ofc-202407290000860546false00008605462024-07-292024-07-29

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): July 29, 2024

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On July 29, 2024, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended June 30, 2024 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended June 30, 2024.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:July 29, 2024

ofc-202404250000860546false00008605462024-04-252024-04-25

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): April 25, 2024

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On April 25, 2024, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended March 31, 2024 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended March 31, 2024.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:April 25, 2024

ofc-202402080000860546false00008605462024-02-082024-02-08

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): February 8, 2024

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On February 8, 2024, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended December 31, 2023 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended December 31, 2023.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:February 8, 2024

ofc-202310260000860546false00008605462023-10-262023-10-26

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): October 26, 2023

COPT DEFENSE PROPERTIES

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

CORPORATE OFFICE PROPERTIES TRUST

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueCDPNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On October 26, 2023, COPT Defense Properties (the “Company”) issued a press release relating to its financial results for the period ended September 30, 2023 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 COPT Defense Properties earnings release and supplemental information for the period ended September 30, 2023.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

COPT DEFENSE PROPERTIES

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:October 26, 2023

ofc-202307270000860546false00008605462023-07-272023-07-27

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): July 27, 2023

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On July 27, 2023, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the period ended June 30, 2023 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended June 30, 2023.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:July 27, 2023

ofc-202304270000860546false00008605462023-04-272023-04-27

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): April 27, 2023

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On April 27, 2023, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the period ended March 31, 2023 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended March 31, 2023.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:April 27, 2023

ofc-202302090000860546false00008605462023-02-092023-02-09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): February 9, 2023

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On February 9, 2023, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the period ended December 31, 2022 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended December 31, 2022.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:February 9, 2023

ofc-202210270000860546false00008605462022-10-272022-10-27

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): October 27, 2022

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On October 27, 2022, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the period ended September 30, 2022 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended September 30, 2022.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:October 27, 2022

ofc-202207280000860546false00008605462022-07-282022-07-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): July 28, 2022

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On July 28, 2022, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the six months ended June 30, 2022 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations as of and for the period ended June 30, 2022.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended June 30, 2022.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:July 28, 2022

ofc-202204280000860546false00008605462022-04-282022-04-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): April 28, 2022

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On April 28, 2022, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the three months ended March 31, 2022 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations as of and for the period ended March 31, 2022.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended March 31, 2022.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:April 28, 2022

ofc-202202100000860546false00008605462022-02-102022-02-10

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): February 10, 2022

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction (Commission File(IRS Employer of incorporation) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD 21046 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code:  (443) 285-5400

Not applicable (Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On February 10, 2022, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the three months and year ended December 31, 2021 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations as of and for the period ended December 31, 2021.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

(d)     Exhibits.

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended December 31, 2021.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Date:February 10, 2022

ofc-202110280000860546false00008605462021-10-282021-10-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 28, 2021

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction of (Commission File(IRS Employer incorporation or organization) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300 Columbia, Maryland 21046 (Address of principal executive offices) (443) 285-5400 (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On October 28, 2021, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the three and nine months ended September 30, 2021 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations as of and for the period ended September 30, 2021.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended September 30, 2021.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Dated:October 28, 2021

ofc-202107290000860546false00008605462021-07-292021-07-29

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 29, 2021

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction of (Commission File(IRS Employer incorporation or organization) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300 Columbia, Maryland 21046 (Address of principal executive offices) (443) 285-5400 (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On July 29, 2021, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the three and six months ended June 30, 2021 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations as of and for the period ended June 30, 2021.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended June 30, 2021.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Dated:July 29, 2021

ofc-202104290000860546false00008605462021-04-292021-04-29

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 29, 2021

CORPORATE OFFICE PROPERTIES TRUST

(Exact name of registrant as specified in its charter)

Maryland 1-1402323-2947217 (State or other jurisdiction of (Commission File(IRS Employer incorporation or organization) Number)Identification No.)

6711 Columbia Gateway Drive, Suite 300 Columbia, Maryland 21046 (Address of principal executive offices) (443) 285-5400 (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Shares of beneficial interest, $0.01 par valueOFCNew York Stock Exchange

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02.             Results of Operations and Financial Condition

On April 29, 2021, Corporate Office Properties Trust (the “Company”) issued a press release relating to its financial results for the three months ended March 31, 2021 and, in connection with this release, is making available certain supplemental information pertaining to its properties and operations as of and for the period ended March 31, 2021.  The earnings release and supplemental information are included as Exhibit 99.1 to this report and are incorporated herein by reference.

The information included herein, including the exhibits, shall not be deemed “filed” for any purpose, including the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to liabilities of that Section.  The information included herein, including the exhibits, shall also not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in such filing.

Item 9.01.             Financial Statements and Exhibits

Exhibit Number Exhibit Title 99.1 Corporate Office Properties Trust earnings release and supplemental information for the period ended March 31, 2021.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CORPORATE OFFICE PROPERTIES TRUST

/s/ Anthony Mifsud Anthony Mifsud Executive Vice President and Chief Financial Officer

Dated:April 29, 2021