MERSANA THERAPEUTICS, INC. is a South Dakota corporation, registered on March 28, 2023. It is based at 840 MEMORIAL DRIVE, CAMBRIDGE, MA, 02139. The company has since been marked inactive on the South Dakota register, is registered under company number FB247484 and carries EIN 043562403. Public records for the company include 1 SoS registration, 1 license, 9 H-1B filings and 15 Form 5500 filings. Every fact here is republished from an official public register and traces back to a primary source document.
| Legal entity name | MERSANA THERAPEUTICS, INC. |
|---|---|
| Principal address | 840 MEMORIAL DRIVECAMBRIDGE02139MAUnited States |
| Registration state | South Dakota |
| Status | Inactive |
| Formed in | Delaware (foreign registration) |
| Home company | MERSANA THERAPEUTICS, INC. |
| Registered | 28 March 2023 (over 3 years ago) |
| Entity type | Corporation |
| Standing | not compliant |
| Company number | FB247484 |
| EIN | 043562403 |
| LEI | 529900VWD5VDZ7PVOS22 |
| Employees (modeled) |
| ≈47 employees2025 |
| H-1B filings | 9 LCA filings, FY 2011–2024 |
|---|
| Registered agent | C T CORPORATION SYSTEM |
|---|
| Source registry | South Dakota Secretary of State · updated 15 June 2026 |
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| Public records | 1 SoS registration |
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| Est. revenue (modeled) | $28.8M2025 |
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| State | Business name | Filed | Registered agent | Officers | Status | |
|---|---|---|---|---|---|---|
| South DakotaTHIS | MERSANA THERAPEUTICS, INC. | 2023-03-28 | C T CORPORATION SYSTEM | — | Inactive | |
Filing ID FB247484 Jurisdiction Foreign · CorporationFormed in Delaware Principal address 840 MEMORIAL DRIVE, CAMBRIDGE, MA, 02139 Registered agent C T CORPORATION SYSTEM319 S COTEAU ST, PIERRE, SD, 57501-3187 Officers Not reported | ||||||
| Alaska | MERSANA THERAPEUTICS, INC. | 2023-04-19 | C T Corporation System | MARTIN HUBORDirectorKRISTEN HEGEDirector9 more | Active | |
| Alabama | Mersana Therapeutics, Inc. | 2023-04-05 | C T CORPORATION SYSTEM | — | Withdrawn | |
| Colorado | MERSANA THERAPEUTICS, INC. | 2022-10-25 | C T CORPORATION SYSTEM | — | Withdrawn | |
| District of Columbia | Mersana Therapeutics, Inc. | 2001-01-04 | C T CORPORATION SYSTEM | DeSchuytner, BrianOfficerDiaz, AlleneOfficer9 more | Withdrawn | |
| Delaware | MERSANA THERAPEUTICS, INC. | 2001-01-04 | THE CORPORATION TRUST COMPANY | — | Unknown | |
| Florida | MERSANA THERAPEUTICS, INC. | 2023-04-17 | C T CORPORATION SYSTEM | ANNA PROTOPAPASOfficer, DirectorLAWRENCE ALLEVADirector3 more | Inactive | |
| Iowa | MERSANA THERAPEUTICS, INC. | 2023-03-28 | IOWA SECRETARY OF STATE | ALEJANDRA CARVAJALOfficerANNA PROTOPAPASOfficer1 more | Inactive | |
| Indiana | MERSANA THERAPEUTICS, INC | 2022-11-10 | C T CORPORATION SYSTEM | Brian DeSchuytnerOfficerDAVID MOTTOfficer9 more | Active | |
| Massachusetts | MERSANA THERAPEUTICS, INC. | 2002-02-11 | C T CORPORATION SYSTEM | MARTIN HUBEROfficer, DirectorASHISH MANDELIAOfficer9 more | Active | |
| Maryland | MERSANA THERAPEUTICS, INC | 2022-11-10 | THE CORPORATION TRUST INCORPORATED | — | Active | |
| Mississippi | Mersana Therapeutics, Inc. | 2023-03-28 | C T CORPORATION SYSTEM | Ashish MandeliaOfficer | Withdrawn | |
| Montana | Mersana Therapeutics, Inc. | 2023-03-28 | — | Andrew HackDirectorAnna ProtopapasDirector9 more | Withdrawn | |
| North Dakota | Mersana Therapeutics, Inc. | 2023-03-31 | ND Secretary of State (N.D.C.C. § 10-01.1-13) | — | Dissolved | |
| New York | MERSANA THERAPEUTICS, INC. | 2021-12-29 | C T CORPORATION SYSTEM | — | Active | |
| Oregon | MERSANA THERAPEUTICS, INC. | 2023-03-29 | C T CORPORATION SYSTEM | ANNA PROTOPAPASOfficerALEJANDRA CARVAJALOfficer | Inactive | |
| Utah | MERSANA THERAPEUTICS, INC. | 2023-03-28 | CT CORPORATION SYSTEM | ALLENE DIAZDirectorANDREW HACKDirector8 more | Inactive | |
| Vermont | MERSANA THERAPEUTICS, INC. | 2023-04-17 | C T CORPORATION SYSTEM | Andrew HackDirectorAnna ProtopapasDirector9 more | Withdrawn | |
| Washington | MERSANA THERAPEUTICS, INC. | 2023-03-30 | C T CORPORATION SYSTEM | ANNA PROTOPAPASDirectorKRISTEN HEGEDirector8 more | Withdrawn | |
Companies and people linked to MERSANA THERAPEUTICS, INC. in the state registers through shared officers, a shared registered agent, shared filing contacts or a shared address. Service companies file for many unrelated businesses — a shared agent, address or contact alone does not prove affiliation.
company person group former role
Browse the indexed registries by state, or look up any debtor name free, at UCC lien search.
| State | License / ID | Type | Issued | Status | |
|---|---|---|---|---|---|
| Connecticut | — | CORPORATION | — | CLOSED | |
| Case | Filed | Job title | Wage | Worksite | Status | |
|---|---|---|---|---|---|---|
| I-200-24198-199413 | 2024-07-16 | Principal Associate Scientist, Biology/Immuno-Oncology | $121,275/yr | Cambridge | Certified | |
| I-200-23240-302392 | 2023-08-28 | Senior Associate Scientist, Biology/Immuno-Oncology | $110,000/yr | Cambridge | Certified | |
| I-200-22126-143633 | 2022-05-06 | Associate Director, Statistical Programming | $210,000/yr | Cambridge | Certified - Withdrawn | |
| I-200-21237-543581 | 2021-08-25 | Senior Associate Scientist | $87,000/yr | Cambridge | Certified | |
| I-200-21235-538959 | 2021-08-23 | Senior Associate Scientist | $87,000/yr | Cambridge | Certified | |
| I-200-21214-496866 | 2021-08-02 | Senior Associate Scientist, Biology/Immuno-Oncology | $100,000/yr | Cambridge | Certified | |
| I-200-21194-459748 | 2021-07-13 | Senior Associate Scientist, Biology/Immuno-Oncology | $100,000/yr | Cambridge | Certified | |
| I-200-19071-785505 | 2019-03-14 | ACCOUNTING MANAGER | $124,200/yr | Cambridge | CERTIFIED | |
| I-200-11224-711324 | 2011-08-12 | ASSOCIATE DIRECTOR, CLINICAL OPERATIONS | $126,922/yr | CAMBRIDGE | CERTIFIED | |
Employee-benefit plan filings by MERSANA THERAPEUTICS, INC. with the Department of Labor. Employee and revenue figures are modeled estimates derived from retirement-plan participant counts and industry ratios — not official headcount or reported revenue.
| Employees (modeled) | ≈47 · plan year 2025 |
|---|---|
| Est. annual revenue (modeled) | $28.8M |
| Retirement plan assets | $32.6M |
| Benefit plans | 401(k) plan on file |
| Filing history | 20 plan years filed, 2006–2025 |
| Sponsor EIN | 04-3562403 |
| Plan year | Employees (est.) | Participants | Plan assets | Revenue (est.) | 401(k) | |
|---|---|---|---|---|---|---|
| 2025 | ≈47 | 223 (42 active) | $32.6M | $28.8M | 401(k) | |
| 2024 | ≈116 | 264 (104 active) | $31.5M | $54.7M | 401(k) | |
| 2023 | ≈136 | 285 (122 active) | $29.1M | $76.4M | 401(k) | |
| 2022 | ≈280 | 206 (252 active) | $22M | $99.5M | 401(k) | |
| 2021 | ≈218 | 137 (196 active) | $20.1M | $70.9M | 401(k) | |
| 2020 | ≈113 | 117 (102 active) | $14.4M | $41.4M | 401(k) | |
| 2019 | ≈93 | 108 (84 active) | $11.7M | $36.7M | 401(k) | |
| 2018 | ≈99 | 87 (89 active) | $8.1M | $36.9M | 401(k) | |
| 2017 | ≈84 | 66 (76 active) | $6.7M | $31.5M | 401(k) | |
| 2016 | ≈66 | 47 (59 active) | $4.5M | $23.3M | 401(k) | |
Matched Form 5500 filing records:
| Plan | Plan year | Participants | EIN | |
|---|---|---|---|---|
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
| MERSANA THERAPEUTICS, INC. 401(K) PROFIT SHARING PLAN TRUST | — | — | — | |
Federal court records load when you reach this section.
Companies adjacent to MERSANA THERAPEUTICS, INC. in the South Dakota Secretary of State register, in alphabetical order.
17 companies are registered at 840 MEMORIAL DRIVE, CAMBRIDGE — shared registered-office and agent addresses are common; a shared address alone does not link businesses.
Netstate aggregates public records from federal, state and municipal sources; records are matched to this company by its registered legal names. Latest source snapshot 2026-06-07. Document getpalm-companies/2862-1327-7153.