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qlys-202602050001107843false00011078432026-02-052026-02-05

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

QUALYS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3566277-0534145 (State or other jurisdiction of incorporation)(Commission File Number) (IRS Employer Identification No.)

919 E. Hillsdale Boulevard, 4th Floor Foster City, California 94404 (Address of principal executive offices, including zip code) (650) 801-6100 (Registrant’s telephone number, including area code) (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:

oWritten communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

oSoliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

oPre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

oPre-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, $0.001 par value per shareQLYSThe NASDAQ Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2 of this chapter). Emerging growth company o 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 February 5, 2026, Qualys, Inc. (“Qualys”) issued a press release announcing its financial results for the quarter and fiscal year ended December 31, 2025. In the press release, Qualys also announced that it will hold a conference call on February 5, 2026, to discuss its financial results for the quarter and fiscal year ended December 31, 2025. The full text of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. This information is intended to be furnished under Item 2.02 of Form 8-K, “Results of Operations and Financial Condition” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01           Financial Statements and Exhibits. (d)Exhibits.

Exhibit No.Description

99.1Press release issued by Qualys, Inc. dated February 5, 2026

104Cover Page Interactive Data File (the cover page XBRL tags are 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.

QUALYS, INC.

By:/s/ JOO MI KIM

Name: Joo Mi Kim Title: Chief Financial Officer

Date: February 5, 2026

qlys-202511040001107843false00011078432025-11-042025-11-04

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) November 4, 2025

QUALYS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3566277-0534145 (State or other jurisdiction of incorporation)(Commission File Number) (IRS Employer Identification No.)

919 E. Hillsdale Boulevard, 4th Floor Foster City, California 94404 (Address of principal executive offices, including zip code) (650) 801-6100 (Registrant’s telephone number, including area code) (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:

oWritten communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

oSoliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

oPre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

oPre-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, $0.001 par value per shareQLYSThe NASDAQ Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2 of this chapter). Emerging growth company o 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 November 4, 2025, Qualys, Inc. (“Qualys”) issued a press release announcing its financial results for the quarter ended September 30, 2025. In the press release, Qualys also announced that it will hold a conference call on November 4, 2025, to discuss its financial results for the quarter ended September 30, 2025. The full text of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. This information is intended to be furnished under Item 2.02 of Form 8-K, “Results of Operations and Financial Condition” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01                                  Financial Statements and Exhibits. (d)Exhibits.

Exhibit No.Description

99.1Press release issued by Qualys, Inc. dated November 4, 2025

104Cover Page Interactive Data File (the cover page XBRL tags are 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.

QUALYS, INC.

By:/s/ JOO MI KIM

Name: Joo Mi Kim Title: Chief Financial Officer

Date: November 4, 2025