SCHEDULE 13D/A

ACELYRIN INC

Common Stock, par value $0.00001 per share · CUSIP: 00445A100

Event date: 2025-03-10

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• TANG CAPITAL MANAGEMENT, LLCReported CIK 0001232621

  Shares: 8,824,693.00 · Class: 8.8%

• KEVIN TANGReported CIK 0001178579

  Shares: 8,824,693.00 · Class: 8.8%

• TANG CAPITAL PARTNERS, LPReported CIK 0001191935

  Shares: 4,963,009.00 · Class: 5.0%

• TANG CAPITAL PARTNERS INTERNATIONAL, LP

  Shares: 3,861,684.00 · Class: 3.8%

• TANG CAPITAL PARTNERS III, INCReported CIK 0002036763

  Shares: 0.00 · Class: 0%

• TANG CAPITAL PARTNERS IV, INCReported CIK 0002036770

  Shares: 0.00 · Class: 0%

• CONCENTRA BIOSCIENCES, LLCReported CIK 0001970065

  Shares: 0.00 · Class: 0%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.