HawkEye 360, Inc.

Rule 10b5-1 Trading Arrangements

During the three months ended June 30, 2026, none of our directors or officers (as defined in Rule 16a-1(f) under the Exchange Act)adopted orterminated any “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Item 408 of Regulation S-K, except as set forth below.

On May 21, 2026, Chris Herndon, the Company’s Chief Information Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Herndon’s trading plan provides for the potential sale of up to 118,125 shares of the Company’s common stock. The trading plan will expire on the earlier of May 1, 2027 and the date when all shares under the trading plan are sold.

On May 21, 2026, Arthur Money, a member of the Company’s Board of Directors, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Money’s trading plan provides for the potential sale of up to 117,136 shares of the Company’s common stock. The trading plan will expire on the earlier of December 31, 2026 and the date when all shares under the trading plan are sold.

On May 21, 2026, Todd Probert, the Company’s Chief Operating Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Probert’s trading plan provides for the potential sale of up to 250,000 shares of the Company’s common stock. The trading plan will expire on the earlier of December 31, 2026 and the date when all shares under the trading plan are sold.

On May 21, 2026, Craig Searle, the Company’s Chief Financial Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Searle’s trading plan provides for the potential sale of up to 91,697 shares of the Company’s common stock, plus an indeterminate number of shares received upon the vesting of restricted stock units during the period covered by the trading plan, net of any shares withheld to satisfy tax withholding obligations. The trading plan will expire on the earlier of December 31, 2027 and the date when all shares under the trading plan are sold.

On May 21, 2026, John Serafini, the Company’s President and Chief Executive Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Serafini’s trading plan provides for the potential sale of up to 137,202 shares of the Company’s common stock, plus an indeterminate number of shares received upon the vesting of restricted stock units during the period covered by the trading plan, net of any shares withheld to satisfy tax withholding obligations. The trading plan will expire on the earlier of March 31, 2027 and the date when all shares under the trading plan are sold.

On May 21, 2026, Michael Turner, the Company’s Chief Legal Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Turner’s trading plan provides for the potential sale of up to 149,500 shares of the Company’s common stock, plus an indeterminate number of shares received upon the vesting of restricted stock units during the period covered by the trading plan, net of any shares withheld to satisfy tax withholding obligations. The trading plan will expire on the earlier of January 31, 2028 and the date when all shares under the trading plan are sold.

On May 21, 2026, James Winnefeld, a member of the Company’s Board of Directors, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Winnefeld’s trading plan provides for the potential sale of up to 103,714 shares of the Company’s common stock. The trading plan will expire on the earlier of March 30, 2028 and the date when all shares under the trading plan are sold.

On May 21, 2026, Patrick Zeitouni, the Company’s Chief Strategy Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Zeitouni’s trading plan provides for the potential sale of up to 220,000 shares of the Company’s common stock. The trading plan will expire on the earlier of December 15, 2026 and the date when all shares under the trading plan are sold.

On May 22, 2026, Alex Fox, the Company’s President of HawkEye 360 International, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Fox’s trading plan provides for the potential sale of up to 203,019 shares of the Company’s common stock. The trading plan will expire on the earlier of December 31, 2026 and the date when all shares under the trading plan are sold.

On May 22, 2026, Janine Sweeney, the Company’s Chief Human Resources Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Ms. Sweeney’s trading plan provides for the potential sale of up to 125,218 shares of the Company’s common stock, plus an indeterminate number of shares received upon the vesting of restricted stock units during the period covered by the trading plan, net of any shares withheld to satisfy tax withholding obligations. The trading plan will expire on the earlier of February 22, 2027 and the date when all shares under the trading plan are sold.