ACELYRIN, INC.
ACELYRIN, INC. is a registered legal entity registered in United States under 4662317, and its current status with California Secretary of State — bizfile Online is active. The company was incorporated on 5 November 2020 and lists its registered address as AGOURA HILLS, United States. 5 shareholders are on record for ACELYRIN, INC., and since every one of them is a company rather than an individual, this particular filing does not on its own establish an ultimate beneficial owner (UBO) — identifying one would mean tracing the ownership of each shareholding company in turn. This profile is sourced directly from California Secretary of State — bizfile Online and was last updated on 4 October 2026.
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Shareholders
5
Five shareholders are currently on record for ACELYRIN, INC., reflecting the stock ledger maintained under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing.
The largest of these is Tang Capital Management, LLC, holding 14% — the largest recorded stake — followed by Ayurmaya Capital Management Company, LP at 13.3%; the remaining 3 shareholders shown hold smaller stakes.
The register reports 20 shareholders in total, though only the top 5 by holding are shown in this view.
Because every shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
| Shareholder | Type | Holding | Source Document |
|---|---|---|---|
| Tang Capital Management, LLC | 14% | California Secretary of State — bizfile Online | |
| Ayurmaya Capital Management Company, LP | 13.3% | California Secretary of State — bizfile Online | |
| Blackrock Inc. | 8.3% | California Secretary of State — bizfile Online | |
| T. Rowe Price Investment Management, Inc. | 6.6% | California Secretary of State — bizfile Online | |
| Madison Avenue Partners, LP | 5.9% | California Secretary of State — bizfile Online |
Officers
5
The Chief People Officer of ACELYRIN, INC. currently on record is Ron Oyston; five officers are currently on record for ACELYRIN, INC., filed with California Secretary of State — bizfile Online.
The register reports 22 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at ACELYRIN, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
The source filing doesn't specify representation authority — whether officers can act individually or must sign jointly to bind the company — so that detail isn't available here.
Group Structure
ACELYRIN, INC. sits 1 level below its ultimate parent, Alumis Inc., registered in United States. 1 subsidiary is recorded beneath it, across 1 jurisdiction. The full chain up to Alumis Inc. is derived by walking shareholder filings across jurisdictions; no link in it is independently corroborated by ACELYRIN, INC.'s own shareholder record. Each of these downward relationships is derived rather than filed: resolved by matching entities across the registry network, not stated directly in a single document.
Those 1 subsidiary spans United States jurisdiction, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear.
Alumis Inc.
United States
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Frequently Asked Questions
Who owns ACELYRIN, INC.?
Five shareholders are currently on record for ACELYRIN, INC., reflecting the stock ledger maintained under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing. The largest of these is Tang Capital Management, LLC, holding 14% — the largest recorded stake — followed by Ayurmaya Capital Management Company, LP at 13.3%; the remaining 3 shareholders shown hold smaller stakes. Because every shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
Who is ACELYRIN, INC.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for ACELYRIN, INC. is itself a company rather than a natural person, so no Ultimate Beneficial Owner (UBO) is identified at this level; establishing one would require tracing the ownership of each shareholding company in turn.
How many shareholders does ACELYRIN, INC. have on record?
5 shareholders are shown on record for ACELYRIN, INC.. The register reports 20 in total; only the top 5 by holding are shown here.
What is ACELYRIN, INC.'s company registration number?
ACELYRIN, INC.'s registration number is 4662317, filed with California Secretary of State — bizfile Online in United States. Its current status on the register is active.
Is ACELYRIN, INC. still an active company?
ACELYRIN, INC.'s status on California Secretary of State — bizfile Online is listed as active.
When was ACELYRIN, INC. incorporated?
ACELYRIN, INC. was incorporated on 5 November 2020, according to California Secretary of State — bizfile Online.
What is ACELYRIN, INC.'s registered address?
The registered address on file for ACELYRIN, INC. is AGOURA HILLS, United States.
Who are the officers/directors of ACELYRIN, INC.?
The Chief People Officer of ACELYRIN, INC. currently on record is Ron Oyston; five officers are currently on record for ACELYRIN, INC., filed with California Secretary of State — bizfile Online. Management authority at ACELYRIN, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does ACELYRIN, INC. have a parent company or subsidiaries?
ACELYRIN, INC. sits 1 level below its ultimate parent, Alumis Inc., registered in United States. 1 subsidiary is recorded beneath it, across 1 jurisdiction. Those 1 subsidiary spans United States jurisdiction, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear.
Can Zavia monitor changes to ACELYRIN, INC.'s ownership over time?
This profile reflects a point-in-time snapshot from California Secretary of State — bizfile Online. Zavia's monitoring API can track changes to ACELYRIN, INC.'s registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access ACELYRIN, INC.'s data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including United States, so records like ACELYRIN, INC.'s registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from California Secretary of State — bizfile Online and was last synced on 4 October 2026.