Insider holders · CIK 0001442836
Mersana Therapeutics, Inc. · MRSN
Every insider with a reported Table I holding at this company, ranked by their last-reported share count. A balance is only as fresh as its filing — the report date sits next to every row on purpose. ← Back to activity
| Insider | Direct shares | Indirect shares | Total reported | Last report (ET) | From |
|---|---|---|---|---|---|
| Anthony A. Florence Jr.10% Owner | 11,890,138 | 8,140,138 | 20,030,276 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| Peter W. Sonsini10% Owner | 11,890,138 | 8,140,138 | 20,030,276 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| Forest Baskett10% Owner | 11,890,138 | 8,140,138 | 20,030,276 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| Scott D Sandell10% Owner | 11,890,138 | 8,140,138 | 20,030,276 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| Patrick J Kerins10% Owner | 11,890,138 | 8,140,138 | 20,030,276 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| Peter J Barris10% Owner | 11,890,138 | 8,140,138 | 20,030,276 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| NEA 14 GP, LTD10% Owner | 11,890,138 | — | 11,890,138 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| NEA Partners 14, L.P.10% Owner | 11,890,138 | — | 11,890,138 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| New Enterprise Associates 14, L.P.10% Owner | 11,890,138 | — | 11,890,138 | Mar 6, 2019 · 4:38 pm EST | Form 4 |
| David M MottDirector | — | 11,890,138 | 11,890,138 | Mar 6, 2019 · 4:39 pm EST | Form 4 |
| Ravi Viswanathan10% Owner | — | 8,140,138 | 8,140,138 | Jul 6, 2017 · 5:20 pm EDT | Form 4 |
| M James Barrett10% Owner | — | 8,140,138 | 8,140,138 | Jul 6, 2017 · 5:16 pm EDT | Form 4 |
| Anna ProtopapasPresident and CEO | 130,719 | 72,263 | 202,982 | Dec 21, 2017 · 4:06 pm EST | Form 4 |
| Wayne FosterVice President of Finance | 71,083 | — | 71,083 | Feb 1, 2018 · 4:01 pm EST | Form 4 |
| Timothy B LowingerChief Scientific Officer | 12,491 | — | 12,491 | Sep 25, 2018 · 5:07 pm EDT | Form 4 |
| FMR LLCrelationship not stated | — | 2,597 | 2,597 | Jul 6, 2017 · 10:41 am EDT | Form 4 |
Balances come from each insider’s most recent filing that reports a Table I holding; an insider who left the company years ago still appears with their last-known figure and its date. Indirect totals collapse multiple vehicles (trusts, LLCs) into one number — open the filing for the breakdown. Shares as filed, not split-adjusted.