MERSANA THERAPEUTICS, INC.
MERSANA THERAPEUTICS, INC. is a Public Limited Company registered in United States under 000810816, and its current status with Massachusetts Secretary of the Commonwealth is active. The company was incorporated on 11 February 2002 and lists its registered address as United States. 5 shareholders are on record for MERSANA THERAPEUTICS, 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 Massachusetts Secretary of the Commonwealth and was last updated on 4 October 2026.
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Shareholders
5
Five shareholders are currently on record for MERSANA THERAPEUTICS, 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 Acadian Asset Management. LLC, holding 5.1% — the largest recorded stake — followed by VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund at 4.8%; the remaining 3 shareholders shown hold smaller stakes.
The register reports 10 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 |
|---|---|---|---|
| Acadian Asset Management. LLC | 5.1% | Massachusetts Secretary of the Commonwealth | |
| VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund | 4.8% | Massachusetts Secretary of the Commonwealth | |
| SilverArc Capital Management, LLC | 4.8% | Massachusetts Secretary of the Commonwealth | |
| 683 Capital Management LLC | 3.6% | Massachusetts Secretary of the Commonwealth | |
| VANGUARD INDEX FUNDS-Vanguard Extended Market Index Fund | 1.5% | Massachusetts Secretary of the Commonwealth |
Officers
5
The Exe. Director And Head Of Biology, Oncology, Antibody-drug Conjugate Adc Discovery & Develop. of MERSANA THERAPEUTICS, INC. currently on record is Marc Damelin; five officers are currently on record for MERSANA THERAPEUTICS, INC., filed with Massachusetts Secretary of the Commonwealth.
The register reports 25 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at MERSANA THERAPEUTICS, 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
MERSANA THERAPEUTICS, INC. sits 1 level below its ultimate parent, Stichting FIRS, registered in Netherlands. The full chain up to Stichting FIRS is derived by walking shareholder filings across jurisdictions; no link in it is independently corroborated by MERSANA THERAPEUTICS, INC.'s own shareholder record.
Stichting FIRS
Netherlands
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Frequently Asked Questions
Who owns MERSANA THERAPEUTICS, INC.?
Five shareholders are currently on record for MERSANA THERAPEUTICS, 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 Acadian Asset Management. LLC, holding 5.1% — the largest recorded stake — followed by VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund at 4.8%; 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 MERSANA THERAPEUTICS, INC.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for MERSANA THERAPEUTICS, 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 MERSANA THERAPEUTICS, INC. have on record?
5 shareholders are shown on record for MERSANA THERAPEUTICS, INC.. The register reports 10 in total; only the top 5 by holding are shown here.
What is MERSANA THERAPEUTICS, INC.'s company registration number?
MERSANA THERAPEUTICS, INC.'s registration number is 000810816, filed with Massachusetts Secretary of the Commonwealth in United States. Its current status on the register is active.
Is MERSANA THERAPEUTICS, INC. still an active company?
MERSANA THERAPEUTICS, INC.'s status on Massachusetts Secretary of the Commonwealth is listed as active.
When was MERSANA THERAPEUTICS, INC. incorporated?
MERSANA THERAPEUTICS, INC. was incorporated on 11 February 2002, according to Massachusetts Secretary of the Commonwealth.
What is MERSANA THERAPEUTICS, INC.'s registered address?
The registered address on file for MERSANA THERAPEUTICS, INC. is United States.
What legal structure is MERSANA THERAPEUTICS, INC. registered as?
MERSANA THERAPEUTICS, INC. is registered as a Public Limited Company in United States.
Who are the officers/directors of MERSANA THERAPEUTICS, INC.?
The Exe. Director And Head Of Biology, Oncology, Antibody-drug Conjugate Adc Discovery & Develop. of MERSANA THERAPEUTICS, INC. currently on record is Marc Damelin; five officers are currently on record for MERSANA THERAPEUTICS, INC., filed with Massachusetts Secretary of the Commonwealth. Management authority at MERSANA THERAPEUTICS, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does MERSANA THERAPEUTICS, INC. have a parent company or subsidiaries?
MERSANA THERAPEUTICS, INC. sits 1 level below its ultimate parent, Stichting FIRS, registered in Netherlands.
Can Zavia monitor changes to MERSANA THERAPEUTICS, INC.'s ownership over time?
This profile reflects a point-in-time snapshot from Massachusetts Secretary of the Commonwealth. Zavia's monitoring API can track changes to MERSANA THERAPEUTICS, 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 MERSANA THERAPEUTICS, 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 MERSANA THERAPEUTICS, 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 Massachusetts Secretary of the Commonwealth and was last synced on 4 October 2026.