AGIO · Agios Pharmaceuticals, Inc.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on July 8, 2025. Beginning on July 8, 2026, the shares underlying the restricted stock units will vest in three equal annual installments.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on July 1, 2023. Beginning on July 1, 2024, the shares underlying the restricted stock units will vest in three equal annual installments.

Shares sold to cover the tax withholding obligation in respect of vesting of the reporting person's restricted stock units. This transaction was effected pursuant to durable automatic sale instructions consistent with the affirmative defense to liability under Section 10(b) of the Securities Exchange Act of 1934 under Rule 10b5-1(c) promulgated under such Act. Such instructions were included in the reporting person's restricted stock unit agreement dated July 1, 2023.

Each performance stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

Each performance stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2025. The shares underlying the stock units will vest in full on June 18, 2026. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each performance stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 5, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2025. The shares underlying the stock units will vest in full on June 18, 2026. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2025. The shares underlying the stock units will vest in full on June 18, 2026. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2025. The shares underlying the stock units will vest in full on June 18, 2026. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2025. The shares underlying the stock units will vest in full on June 18, 2026. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2025. The shares underlying the stock units will vest in full on June 18, 2026. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

These options were granted on June 18, 2026. The shares underlying these options vest as to 100% of the underlying shares on June 18, 2027.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2025. The shares underlying the stock units will vest in full on June 18, 2026. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2025. The shares underlying the stock units will vest in full on June 18, 2026. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each performance stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 5, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each performance stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

The restricted stock units were granted on June 18, 2026. The shares underlying the stock units will vest in full on June 18, 2027. Vested shares will be delivered to the reporting person within three business days after such shares become vested.

Each performance stock unit represents a contingent right to receive one share of the issuer's common stock.

Performance stock units were granted on March 1, 2025, and provide for the vesting of underlying shares upon the achievement of three specified clinical and research milestones established by the compensation & people committee, or board of directors, as applicable. The performance criteria for the specified research milestone was determined by the compensation & people committee to be met as of June 18, 2026. The shares related to such milestone will vest on December 31, 2027, subject to the recipient's continued service.