Heritage Insurance Holdings, Inc.

Rule 10b5-1 Trading Plans

On August 19, 2026, Tim Moura, President of NBIC, adopted a “Rule 10b5-1 trading arrangement” as defined in Regulation S-K Item 408, providing for the sale of the Company’s common stock that is intended to satisfy the affirmative defense conditions of Exchange Act Rule 10b5-1(c). Mr. Moura’s Rule 10b5-1 trading plan provides for the sale of up to 53,256 shares of the Company’s common stock pursuant to one or more limit orders from and after December 23, 2026 and expires on August 31, 2027. Mr. Moura’s 10b5-1 trading plan expires on August 31, 2027 or upon the earlier completion of all authorized transactions under the plan.

No other officers or directors, as defined in Rule 16a-1(f), adopted orterminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” as defined in Regulation S-K Item 408, during the quarter ended September 30, 2026.

In addition, in the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2026, filed with the SEC on August 7, 2026, the Company inadvertently omitted disclosure regarding the early termination of a Rule 10b5-1 trading plan by Ernesto Garateix, the Company’s Chief Executive Officer, on May 20, 2026. As previously disclosed, Mr. Garateix’s Rule 10b5-1 trading plan wasadopted on June 13, 2025 and provided for the sale of up to 100,000 shares of the Company’s common stock pursuant to one or more limit orders until September 19, 2026. Mr. Garateix has not subsequently entered into another Rule 10b5-1 trading plan.