​

  ​ ​ ​

June 30, 

  ​ ​ ​

December 31, 

​

​

2026

​

2025

Stock options issued and outstanding

21,486,374

20,353,098

RSUs issued and outstanding

​

3,263,275

​

2,527,377

Shares available for grant under the 2024 Equity Incentive Plan

​

927,409

​

597,112

Shares available for grant under the 2024 Employee Stock Purchase Plan

​

1,599,251

​

805,334

Shares available for grant under the ACELYRIN, Inc. 2023 Equity Incentive Plan

​

6,372,372

​

6,585,521

Shares available for grant under the 2024 Performance Option Plan

​

201,202

​

200,208

Total

33,849,883

31,068,650