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Reference ID: 0.e618d017.1785585905.2ef2ca25

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SEC.gov | Request Rate Threshold Exceeded

U.S. Securities and Exchange Commission

You’ve Exceeded the SEC’s Traffic Limit

Your request rate has exceeded the SEC’s maximum allowable requests per second. Your access to SEC.gov will be limited for 10 minutes.

Current guidelines limit each user to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests. To ensure that SEC.gov remains available to all users, we reserve the right to block IP addresses that submit excessive requests.

The block will be lifted automatically by waiting 10 minutes. Continuing to exceed the SEC’s maximum allowable request rate during the time-out period will extend the duration of the time-out period. To ensure fair access for all users, please reduce the rate of your requests and visit SEC.gov again after the 10 minute time-out period has passed.

For best practices on efficiently downloading information from SEC.gov, including the latest EDGAR filings, visit sec.gov/developer. You can also sign up for email updates on the SEC open data program, including best practices that make it more efficient to download data, and SEC.gov enhancements that may impact scripted downloading processes. For more information, contact opendata@sec.gov.

For more information, please see the SEC’s Web Site Privacy and Security Policy. Thank you for your interest in the U.S. Securities and Exchange Commission.

Reference ID: 0.c706d217.1784381764.d6240834

More Information

Internet Security Policy

By using this site, you are agreeing to security monitoring and auditing. For security purposes, and to ensure that the public service remains available to users, this government computer system employs programs to monitor network traffic to identify unauthorized attempts to upload or change information or to otherwise cause damage, including attempts to deny service to users.

Unauthorized attempts to upload information and/or change information on any portion of this site are strictly prohibited and are subject to prosecution under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act of 1996 (see Title 18 U.S.C. §§ 1001 and 1030).

To ensure our website performs well for all users, the SEC monitors the frequency of requests for SEC.gov content to ensure automated searches do not impact the ability of others to access SEC.gov content. We reserve the right to block IP addresses that submit excessive requests. Current guidelines limit users to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests.

If a user or application submits more than 10 requests per second, further requests from the IP address(es) may be limited for a brief period. Once the rate of requests has dropped below the threshold for 10 minutes, the user may resume accessing content on SEC.gov. This SEC practice is designed to limit excessive automated searches on SEC.gov and is not intended or expected to impact individuals browsing the SEC.gov website.

Note that this policy may change as the SEC manages SEC.gov to ensure that the website performs efficiently and remains available to all users.

Note: We do not offer technical support for developing or debugging scripted downloading processes.

adp-202601281/28/20260000008670FALSE00000086702026-01-282026-01-28

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): January 28, 2026

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On January 28, 2026, the Registrant issued a press release announcing that the Registrant's financial results for the second quarter ended December 31, 2025 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated January 28, 2026 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Peter Hadley Date: January 28, 2026Name: Peter Hadley Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated January 28, 2026 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-2025102910/29/20250000008670FALSE00000086702025-10-292025-10-29

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): October 29, 2025

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On October 29, 2025, the Registrant issued a press release announcing that the Registrant's financial results for the first quarter ended September 30, 2025 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated October 29, 2025 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Peter Hadley Date: October 29, 2025Name: Peter Hadley Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated October 29, 2025 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202507307/30/20250000008670FALSE00000086702025-07-302025-07-30

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): July 30, 2025

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On July 30, 2025, the Registrant issued a press release announcing that the Registrant's financial results for the fourth quarter and fiscal year ended June 30, 2025 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated July 30, 2025 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Peter Hadley Date: July 30, 2025Name: Peter Hadley Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated July 30, 2025 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202504304/30/20250000008670FALSE00000086702025-04-302025-04-30

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): April 30, 2025

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On April 30, 2025, the Registrant issued a press release announcing that the Registrant's financial results for the third quarter ended March 31, 2025 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated April 30, 2025 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: April 30, 2025Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated April 30, 2025 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202501291/29/20250000008670FALSE00000086702025-01-292025-01-29

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): January 29, 2025

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On January 29, 2025, the Registrant issued a press release announcing that the Registrant's financial results for the second quarter ended December 31, 2024 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated January 29, 2025 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: January 29, 2025Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated January 29, 2025 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-2024103010/30/20240000008670FALSE00000086702024-10-302024-10-30

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, 2024

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On October 30, 2024, the Registrant issued a press release announcing that the Registrant's financial results for the first quarter ended September 30, 2024 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated October 30, 2024 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: October 30, 2024Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated October 30, 2024 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202407317/31/20240000008670FALSE00000086702024-07-312024-07-31

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 31, 2024

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On July 31, 2024, the Registrant issued a press release announcing that the Registrant's financial results for the fourth quarter and fiscal year ended June 30, 2024 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated July 31, 2024 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: July 31, 2024Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated July 31, 2024 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202405015/1/20240000008670FALSE00000086702024-05-012024-05-01

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): May 1, 2024

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On May 1, 2024, the Registrant issued a press release announcing that the Registrant's financial results for the third quarter ended March 31, 2024 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated May 1, 2024 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: May 1, 2024Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated May 1, 2024 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202401311/31/20240000008670FALSE00000086702024-01-312024-01-31

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): January 31, 2024

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On January 31, 2024, the Registrant issued a press release announcing that the Registrant's financial results for the second quarter ended December 31, 2023 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated January 31, 2024 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: January 31, 2024Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated January 31, 2024 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-2023102510/25/20230000008670FALSE00000086702023-10-252023-10-25

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): October 25, 2023

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On October 25, 2023, the Registrant issued a press release announcing that the Registrant's financial results for the first quarter ended September 30, 2023 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated October 25, 2023 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: October 25, 2023Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated October 25, 2023 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202307267/26/20230000008670FALSE00000086702023-07-262023-07-26

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): July 26, 2023

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On July 26, 2023, the Registrant issued a press release announcing that the Registrant's financial results for the fourth quarter and fiscal year ended June 30, 2023 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated July 26, 2023 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: July 26, 2023Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated July 26, 2023 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202304264/26/20230000008670FALSE00000086702023-04-262023-04-26

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): April 26, 2023

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On April 26, 2023, the Registrant issued a press release announcing that the Registrant's financial results for the third quarter ended March 31, 2023 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated April 26, 2023 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: April 26, 2023Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated April 26, 2023 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202301251/25/20230000008670FALSE00000086702023-01-252023-01-25

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): January 25, 2023

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On January 25, 2023, the Registrant issued a press release announcing that the Registrant's financial results for the second quarter ended December 31, 2022 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated January 25, 2023 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: January 25, 2023Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated January 25, 2023 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-2022102610/26/20220000008670FALSE00000086702022-10-262022-10-26

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, 2022

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On October 26, 2022, the Registrant issued a press release announcing that the Registrant's financial results for the first quarter ended September 30, 2022 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated October 26, 2022 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: October 26, 2022Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated October 26, 2022 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202207277/27/20220000008670FALSE00000086702022-07-272022-07-27

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, 2022

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On July 27, 2022, the Registrant issued a press release announcing that the Registrant's financial results for the fourth quarter and fiscal year ended June 30, 2022 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated July 27, 2022 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: July 27, 2022Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated July 27, 2022 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202204274/27/20220000008670FALSE00000086702022-04-272022-04-27

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, 2022

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On April 27, 2022, the Registrant issued a press release announcing that the Registrant's financial results for the third quarter ended March 31, 2022 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated April 27, 2022 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: April 27, 2022Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated April 27, 2022 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-202201261/26/20220000008670FALSE00000086702022-01-262022-01-26

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): January 26, 2022

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On January 26, 2022, the Registrant issued a press release announcing that the Registrant's financial results for the second quarter ended December 31, 2021 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated January 26, 2022 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: January 26, 2022Name: Don McGuire Title: Chief Financial Officer

3

Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated January 26, 2022 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

4

adp-2021102710/27/20210000008670FALSE00000086702021-10-272021-10-27

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, 2021

Automatic Data Processing, Inc.

(Exact name of registrant as specified in charter)

Delaware1-539722-1467904 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)

One ADP Boulevard, Roseland, New Jersey                07068 (Address of principal executive offices)                 (Zip Code)

(973) 974-5000 (Registrant's telephone number, including area code) N/A (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: ☐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 Stock, $0.10 Par Value (voting)ADPNASDAQ Global Select Market

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. o

Item 2.02. Results of Operations and Financial Condition.

On October 27, 2021 the Registrant issued a press release announcing that the Registrant's financial results for the first quarter ended September 30, 2021 were available through an earnings release available on the Registrant's website. A copy of the Registrant's earnings release is attached hereto as Exhibit 99 and is hereby incorporated by reference.

Item 9.01. Financial Statements and Exhibits. (d)Exhibit 99 Earnings Release dated October 27, 2021 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

SIGNATURE

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.

AUTOMATIC DATA PROCESSING, INC.

(Registrant)

By:/s/ Don McGuire Date: October 27, 2021Name: Don McGuire Title: Chief Financial Officer

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Exhibit Index

Exhibit NumberDescription 99 Earnings Release dated October 27, 2021 issued by Automatic Data Processing, Inc.

104Cover Page Interactive Data File, embedded in Inline XBRL.

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