Mersana Therapeutics, Inc.
Total Trades
105
Buys
9
Sells
48
Largest Trade
N/A
Insiders
10
Institutional Funds
39
Inst. Value
$1M+
Activist Filings
46
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Lowinger Timothy B | Chief Science & Te… | SELL | $15K–$50K | 5K | $5.92 | Jan 19, 2022 |
| Mandelia Ashish | VP, Controller | SELL | $1K–$15K | 2K | $5.92 | Jan 19, 2022 |
| Mandelia Ashish | VP, Controller | EXERCISE | N/A | 5K | — | Jan 19, 2022 |
| Hack Andrew A. F. | Director | BUY | $1M+ | 815K | $6.15 | Jan 4, 2022 |
| Hack Andrew A. F. | Director | BUY | $1M+ | 875K | $5.75 | Jan 3, 2022 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 39 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| Nextech Invest, Ltd. | 483K | $1M+ | SH |
| Bain Capital Life Sciences Investors, LLC | 347K | $1M+ | SH |
| Alamea Verwaltungs GmbH | 24K | $1M+ | SH |
| ACADIAN ASSET MANAGEMENT LLC | 111K | $1M+ | SH |
| Affinity Asset Advisors, LLC | 100K | $1M+ | SH |
| Groupe la Francaise | 61K | $1M+ | SH |
| GABELLI FUNDS LLC | 47K | $1M+ | SH |
| CREDIT INDUSTRIEL ET COMMERCIAL | 41K | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 36K | $1M+ | SH |
| MACKENZIE FINANCIAL CORP | 34K | $500K+ | SH |
| Yakira Capital Management, Inc. | 33K | $500K+ | SH |
| VANGUARD GROUP INC | 25K | $500K+ | SH |
| STATE STREET CORP | 20K | $500K+ | SH |
| DELTEC ASSET MANAGEMENT LLC | 18K | $500K+ | SH |
| IEQ CAPITAL, LLC | 13K | $100K–$500K | SH |
| Point72 Asset Management, L.P. | 10K | $100K–$500K | SH |
| GAMCO INVESTORS, INC. ET AL | 10K | $100K–$500K | SH |
| Knott David M Jr | 10K | $100K–$500K | SH |
| OMERS ADMINISTRATION Corp | 8K | $100K–$500K | SH |
| EQUITEC PROPRIETARY MARKETS, LLC | 6K | $100K–$500K | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Jan 30, 2026
4.2%
210K shares
Nextech Crossover I GP S.a. r.l.
SC 13G/A · Jan 9, 2026
0.0%
0 shares
Bain Capital Life Sciences Fund II, L.P.
SC 13D/A · Jan 8, 2026
0.0%
0 shares
SC 13G · Nov 24, 2025
5.5%
273K shares
Schonfeld Strategic Advisors LLC
SC 13G · Nov 14, 2025
5.5%
274K shares
Bain Capital Life Sciences Fund II, L.P.
SC 13D/A · Nov 13, 2025
2.6%
132K shares
Schonfeld Strategic Advisors LLC
SC 13G/A · Aug 14, 2025
4.5%
5.7M shares
SC 13G/A · Jul 17, 2025
3.0%
3.8M shares
Venrock Healthcare Capital Partners III, L.P.
SC 13G/A · May 15, 2025
2.9%
3.6M shares
Schonfeld Strategic Advisors LLC
SC 13G · May 15, 2025
6.1%
7.6M shares
SC 13G/A · May 15, 2025
0.0%
0 shares
SC 13G/A · Apr 30, 2025
6.7%
8.4M shares
SC 13G/A · Apr 17, 2025
6.7%
8.3M shares
Venrock Healthcare Capital Partners III, L.P.
SC 13G/A · Feb 14, 2025
8.3%
10.3M shares
SC 13G/A · Feb 5, 2025
8.0%
9.2M shares
Nextech Crossover I GP S.a. r.l.
SC 13G/A · Dec 26, 2024
10.4%
12.1M shares
SC 13G/A · Dec 24, 2024
10.0%
11.6M shares
Bain Capital Life Sciences Fund II, L.P. 2
SC 13D/A · Nov 15, 2024
2.7%
3.3M shares
SC 13G/A · Nov 14, 2024
9.8%
12.1M shares
Balyasny Asset Management L.P. 2
SC 13G/A · Nov 14, 2024
0.4%
536K shares
SilverArc Capital Management, LLC
SC 13G/A · Oct 15, 2024
1.4%
1.8M shares
SC 13G · May 17, 2024
5.1%
6.2M shares
Venrock Healthcare Capital Partners III, L.P.
SC 13G/A · Feb 15, 2024
9.4%
11.3M shares
SilverArc Capital Management, LLC
SC 13G · Feb 15, 2024
5.3%
6.4M shares
SC 13G/A · Feb 14, 2024
0.0%
0 shares
SC 13G/A · Feb 14, 2024
0.0%
0 shares
Balyasny Asset Management L.P. 2
SC 13G · Feb 14, 2024
8.0%
9.7M shares
The Vanguard Group - 23-1945930
SC 13G · Feb 13, 2024
5.2%
6.2M shares
SC 13G/A · Jan 29, 2024
6.5%
7.8M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G/A · Jan 22, 2024
1.9%
0 shares
Venrock Healthcare Capital Partners III, L.P.
SC 13G · Aug 7, 2023
8.5%
9.7M shares
SC 13G · Jul 27, 2023
16.9%
19.4M shares
SC 13G · Feb 14, 2023
7.1%
7.1M shares
SC 13G/A · Feb 14, 2023
4.1%
4.1M shares
SC 13G/A · Feb 14, 2023
7.6%
7.5M shares
SC 13G/A · Feb 13, 2023
0.0%
0 shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G/A · Feb 3, 2023
5.9%
0 shares
SC 13G/A · Jan 31, 2023
7.5%
7.5M shares
SC 13G/A · Jan 19, 2023
3.7%
3.7M shares
Bain Capital Life Sciences Fund II, L.P.
SC 13D/A · May 11, 2022
3.4%
3.3M shares
Bain Capital Life Sciences Fund II, L.P.
SC 13D/A · Apr 14, 2022
3.9%
3.3M shares
SC 13G · Feb 17, 2022
5.2%
3.7M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G · Feb 11, 2022
5.9%
0 shares
SC 13G · Jan 27, 2022
10.4%
7.5M shares
SC 13G/A · Jan 26, 2022
10.4%
7.5M shares
Bain Capital Life Sciences Fund II, L.P.
SC 13D/A · Jan 3, 2022
4.5%
3.3M shares