Backblaze, Inc.

Rule 10b5-1 Trading Plans

During the quarter ended September 30, 2026, the individuals listed below adopted, modified, orterminated trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

On September 11, 2026, Marc Suidan, our Chief Financial Officer (“CFO”), entered into a trading plan that provides for the sale of an aggregate of up to 144,456 shares of our Class A common stock. Trades may commence as early as March 8, 2027. The plan will terminate on November 23, 2027, subject to early termination for certain specified events set forth in the plan.

On September 15, 2026, Gleb Budman, our Chief Executive Officer (“CEO”), Director and Chairman of the Board, entered into a trading plan that provides for the sale of an aggregate of up to 500,000 shares of our Class A common stock. Trades may commence as early as March 8, 2027. The plan will terminate on November 26, 2027, subject to early termination for certain specified events set forth in the plan.

On September 15, 2026, Barbara Nelson, a Director, entered into a trading plan that provides for the sale of 6,757 shares of our Class A common stock. Trades may commence as early as the first trading date after our 2027 Annual Meeting of Stockholders. The plan will terminate on June 7, 2027, subject to early termination for certain specified events set forth in the plan.

Effective August 15, 2025, the Company adopted stock ownership guidelines (the "Guidelines") to align the interests of our executives with those of our stockholders. Minimum ownership requirements include: (i) five times their annual cash retainer in connection with their Board and committee service; (ii) five times the annual base salary for the CEO; (iii) three times the annual base salary for the CFO; and (iv) one times the annual base salary for all executives directly reporting to the CEO. Each executive has five years from the effective date of the Guidelines or their date of appointment to achieve the applicable ownership requirement. Assuming all planned sales are completed under the respective plan, Messrs. Budman and Suidan, and Ms. Nelson will continue to meet the Company’s Guidelines and their stake in the Company will remain significant.