SCHEDULE 13D

ACELYRIN INC

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

Event date: 2025-02-18

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: 5,298,328.00 · Class: 5.3%

• KEVIN TANGReported CIK 0001178579

  Shares: 5,298,328.00 · Class: 5.3%

• TANG CAPITAL PARTNERS, LPReported CIK 0001191935

  Shares: 2,979,781.00 · Class: 3.0%

• TANG CAPITAL PARTNERS INTERNATIONAL, LP

  Shares: 2,318,547.00 · Class: 2.3%

• TANG CAPITAL PARTNERS III, INC

  Shares: 0.00 · Class: 0.00%

• TANG CAPITAL PARTNERS IV, INC

  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.