DIBS · 1stdibs.com, Inc.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 12 equal quarterly installments starting on June 8, 2026, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2024, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

These shares were retained by Issuer via settlement on a net withholding basis in order to meet the tax withholding obligations of the reporting person in connection with the vesting of an installment of restricted stock units ("RSUs") granted to the reporting person on March 15, 2024, March 13, 2025, and March 16, 2025. None of these shares were sold in an open market transaction.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 12 equal quarterly installments starting on June 8, 2024, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 12 equal quarterly installments starting on June 8, 2026, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2025, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 12 equal quarterly installments starting on June 8, 2026, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Twenty-five percent (25%) of the restricted stock units shall vest on June 8, 2023, provided the Reporting Person continues to have a service relationship with the Issuer at such time. Thereafter, the remaining seventy-five percent (75%) of the restricted stock units shall vest in 12 equal quarterly installments starting on September 8, 2023, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 12 equal quarterly installments starting on June 8, 2025, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2025, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2023, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

These shares were retained by Issuer via settlement on a net withholding basis in order to meet the tax withholding obligations of the reporting person in connection with the vesting of an installment of restricted stock units ("RSUs") granted to the reporting person on March 15, 2023, March 8, 2024, March 14, 2025 and March 16, 2026. None of these shares were sold in an open market transaction.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2024, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

These shares were retained by Issuer via settlement on a net withholding basis in order to meet the tax withholding obligations of the reporting person in connection with the vesting of an installment of restricted stock units ("RSUs") granted to the reporting person on June 2, 2022, March 14, 2023, March 15, 2025, and March 16, 2026. None of these shares were sold in an open market transaction.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units have no expiration date.

This transaction was effected pursuant to a Rule 10b5-1 trading plan, adopted December 9, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.50 to $5.54, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 12 equal quarterly installments starting on June 8, 2026, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.

This transaction was effected pursuant to a Rule 10b5-1 trading plan, adopted December 9, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.50 to $5.51, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The initial number of restricted stock units granted shall vest in 12 equal quarterly installments starting on June 8, 2026, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.