Results of Operations and Financial Condition. On August 6, 2026, Castellum, Inc. (the “Company”) issued a press release announcing second quarter and first half 2026 financial results. The full text of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

The filing appears to be about compensatory arrangements or other non-management matters mis-filed under Item 5.02.

Entry into a material definitive agreement. On July 1, 2026, (the "Effective Date") Castellum, Inc. (the "Company") amended the terms of the employment agreement dated July 1, 2024 by and between the Company and its President and Chief Executive Officer, Glen R. Ives (the "Ives Employment Agreement"), to extend the term for an eighteen month period (the "Extended Renewal Term"), expiring on December 31, 2027 (the "Ives Second Amendment"). In consideration of the Extended Renewal Term, Mr. Ive…

Other Events. On June 15, 2026, Castellum, Inc. issued a press release announcing its joint venture has won a position on a $250 million U.S. Navy logistics IT multiple award contract. The full text of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

and this Item 7.01, including Exhibit 99.1 and 99.2, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing made by the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

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.

The filing details changes in employment arrangements and compensation for existing officers.

Executive Vice-President Strategy, General Counsel, and Secretary — Jay O. Wright: Jay O. Wright resigned from multiple senior roles and the board of directors.

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.

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.

Entry into a Material Definitive Agreement On August 4, 2025 Castellum, Inc. (the "Company") and Emil Kaunitz executed a a letter agreement dated August 1, 2025 to extend the maturity date of a note payable in the principal amount of $400,000 (the "Note") to March 1, 2026, at which time the principal amount will amortize at $50,000 per month for eight months. All other terms of the Note remain unchanged.

Entry into a Material Definitive Agreement. On June 12, 2025 Castellum, Inc. (the “Company”), entered into a securities purchase agreement (the “Purchase Agreement”) with two institutional investors named on the signature pages thereto (the “Purchasers”), pursuant to which the Company agreed to sell and issue to the Purchasers, in a public offering that included certain additional other purchasers, an aggregate of 4,166,667 units (the "Units" with each Unit consisting of one (1) share of comm…

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.

Entry into a Material Definitive Agreement. On April 17, 2025, Castellum, Inc. (the "Company") entered into an amendment to the letter agreement dated February 24, 2024 with Robert Eisiminger (the "Amended Letter Agreement") pursuant to which Mr. Eisiminger agreed to accept a $2 million principal payment (the "Principal Payment") from the Company on two notes payable. As a result of the Principal Payment, the principal balance on the note payable with a principal balance of $400,000 dated Feb…

Other Events. As previously disclosed, on March 16, 2025 Castellum, Inc. (the “Company”), entered into a securities purchase agreement (the “Purchase Agreement”) with several institutional investors named on the signature pages thereto (the “Purchasers”), pursuant to which the Company agreed to sell and issue to the Purchasers, in a public offering that included certain additional other purchasers, an aggregate of 4,500,000 units (the "Units") with each Unit consisting of one (1) share of com…

The filing appears to be about compensatory arrangements or other non-management matters mis-filed under Item 5.02.

Entry into a material definitive agreement. On March 31, 2025, Castellum, Inc. (the "Company") amended the terms of the employment agreement dated July 1, 2024 by and between the Company and its Executive Vice President Strategy and General Counsel, Jay O. Wright (the "Wright Employment Agreement"), to extend the term for a nine-month period, expiring on December 31, 2025 (the "Wright Amendment"). All other terms of the Wright Employment Agreement remain unchanged. As previously disclosed by…

Entry into a Material Definitive Agreement. On March 16, 2025 Castellum, Inc. (the “Company”), entered into a securities purchase agreement (the “Purchase Agreement”) with several institutional investors named on the signature pages thereto (the “Purchasers”), pursuant to which the Company agreed to sell and issue to the Purchasers, in a public offering that included certain additional other purchasers, an aggregate of 4,500,000 units (the "Units" with each Unit consisting of one (1) share of…

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. The Company is making reference to certain Non-GAAP financial information in the press release. A reconciliation of…

Entry into a Material Definitive Agreement. On December 27, 2024, Castellum, Inc. (the “Company”), entered into a securities purchase agreement (the “Purchase Agreement”) with the several institutional investors named on the signature pages thereto (the “Purchasers”), pursuant to which the Company agreed to sell and issue to the Purchasers, in a public offering that included certain additional other purchasers, an aggregate of 4,355,000 shares of common stock (the “Shares”) of the Company’s c…

Entry into a Material Definitive Agreement. On December 22, 2024, Castellum, Inc. (the “Company”), entered into a securities purchase agreement (the “Purchase Agreement”) with the several institutional investors named on the signature pages thereto (the “Purchasers”), pursuant to which the Company agreed to sell and issue, in a registered direct offering, an aggregate of 9,473,700 shares of common stock (the “Shares”) of the Company’s common stock (“Common Stock”), par value $0.0001, at a pur…

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.

Entry into a Material Definitive Agreement On September 2, 2024, Castellum, Inc. (the "Company") and its subsidiaries entered into a loan modification agreement effective August 15, 2024 (the "Loan Modification Agreement") with Live Oak Banking Company (the "Lender") to modify certain terms of the revolving line of credit promissory note dated February 22, 2024 (the "Original Note"). Among other things, the Loan Modification Agreement (i) modified the definition of the term contained in the O…

COO — Andrew "Drew" Merriman: The filing discloses the appointment of a new Chief Operating Officer, which is a senior management addition rather than a departure.

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. The Company is making reference to certain Non-GAAP financial information in the press release. A reconciliation of…