KRONOS BIO, INC.
KRONOS BIO, INC. is a registered legal entity registered in United States under 4288373, and its current status with California Secretary of State — bizfile Online is active. The company was incorporated on 14 June 2019 and lists its registered address as SAN MATEO, United States. 5 shareholders are on record for KRONOS BIO, 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 5 October 2026.
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Shareholders
5
Five shareholders are currently on record for KRONOS BIO, 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 Vida Ventures Advisors, LLC, holding 15.9% — the largest recorded stake — followed by Vanguard Group Inc at 11.1%; 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 |
|---|---|---|---|
| Vida Ventures Advisors, LLC | 15.9% | California Secretary of State — bizfile Online | |
| Vanguard Group Inc | 11.1% | California Secretary of State — bizfile Online | |
| Partners Capital Investment Group, LLP | 8.3% | California Secretary of State — bizfile Online | |
| Alphabet Inc. | 8.3% | California Secretary of State — bizfile Online | |
| Millennium Management Llc | 8.2% | California Secretary of State — bizfile Online |
Officers
5
The President, Ceo & Director of KRONOS BIO, INC. currently on record is Norbert W. Bischofberger Ph.d.; five officers are currently on record for KRONOS BIO, INC., filed with California Secretary of State — bizfile Online.
The register reports 17 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at KRONOS BIO, 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
KRONOS BIO, INC. sits 1 level below its ultimate parent, Concentra Biosciences, LLC, registered in United States. 1 subsidiary is recorded beneath it, across 1 jurisdiction. The full chain up to Concentra Biosciences, LLC is derived by walking shareholder filings across jurisdictions; no link in it is independently corroborated by KRONOS BIO, 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.
Concentra Biosciences, LLC
United States
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Frequently Asked Questions
Who owns KRONOS BIO, INC.?
Five shareholders are currently on record for KRONOS BIO, 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 Vida Ventures Advisors, LLC, holding 15.9% — the largest recorded stake — followed by Vanguard Group Inc at 11.1%; 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 KRONOS BIO, INC.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for KRONOS BIO, 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 KRONOS BIO, INC. have on record?
5 shareholders are shown on record for KRONOS BIO, INC.. The register reports 20 in total; only the top 5 by holding are shown here.
What is KRONOS BIO, INC.'s company registration number?
KRONOS BIO, INC.'s registration number is 4288373, filed with California Secretary of State — bizfile Online in United States. Its current status on the register is active.
Is KRONOS BIO, INC. still an active company?
KRONOS BIO, INC.'s status on California Secretary of State — bizfile Online is listed as active.
When was KRONOS BIO, INC. incorporated?
KRONOS BIO, INC. was incorporated on 14 June 2019, according to California Secretary of State — bizfile Online.
What is KRONOS BIO, INC.'s registered address?
The registered address on file for KRONOS BIO, INC. is SAN MATEO, United States.
Who are the officers/directors of KRONOS BIO, INC.?
The President, Ceo & Director of KRONOS BIO, INC. currently on record is Norbert W. Bischofberger Ph.d.; five officers are currently on record for KRONOS BIO, INC., filed with California Secretary of State — bizfile Online. Management authority at KRONOS BIO, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does KRONOS BIO, INC. have a parent company or subsidiaries?
KRONOS BIO, INC. sits 1 level below its ultimate parent, Concentra Biosciences, LLC, 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 KRONOS BIO, 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 KRONOS BIO, 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 KRONOS BIO, 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 KRONOS BIO, 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 5 October 2026.