INSMED Inc
Total Trades
214
Buys
5
Sells
140
Largest Trade
N/A
Insiders
12
Institutional Funds
551
Inst. Value
$1M+
Activist Filings
27
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Smith Michael Alexander | Chief Legal Officer | EXERCISE | $100K–$500K | 13K | $30.46 | Sep 4, 2025 |
| Flammer Martina M.D. | Chief Medical Offi… | EXERCISE | $1M+ | 187K | $23.40 | Sep 4, 2025 |
| Flammer Martina M.D. | Chief Medical Offi… | SELL | $1M+ | 187K | $144.34 | Sep 4, 2025 |
| Bonstein Sara | CFO | EXERCISE | $1M+ | 48K | $30.63 | Jul 23, 2025 |
| Bonstein Sara | CFO | SELL | $1M+ | 58K | $102.67 | Jul 23, 2025 |
| Lewis William | Chair and CEO | EXERCISE | $50K–$100K | 7K | $10.85 | Jul 15, 2025 |
| Lewis William | Chair and CEO | SELL | $500K+ | 7K | $102.37 | Jul 15, 2025 |
| Smith Michael Alexander | Chief Legal Officer | SELL | $100K–$500K | 2K | $99.80 | Jul 15, 2025 |
| Bonstein Sara | CFO | EXERCISE | $1M+ | 48K | $25.41 | Jul 9, 2025 |
| Bonstein Sara | CFO | SELL | $1M+ | 58K | $95.86 | Jul 9, 2025 |
| Lewis William | Chair and CEO | EXERCISE | $50K–$100K | 7K | $10.85 | Jul 2, 2025 |
| Lewis William | Chair and CEO | SELL | $500K+ | 7K | $98.33 | Jul 2, 2025 |
| Bonstein Sara | CFO | EXERCISE | $500K+ | 48K | $19.16 | Jun 25, 2025 |
| Bonstein Sara | CFO | SELL | $1M+ | 58K | $101.78 | Jun 25, 2025 |
| Lewis William | Chair and CEO | SELL | $1M+ | 135K | $100.39 | Jun 18, 2025 |
| Lewis William | Chair and CEO | EXERCISE | $1M+ | 130K | $10.85 | Jun 18, 2025 |
| Adsett Roger | COO | SELL | $1M+ | 11K | $98.82 | Jun 18, 2025 |
| Flammer Martina M.D. | Chief Medical Offi… | EXERCISE | $1M+ | 45K | $22.42 | Jun 12, 2025 |
| Flammer Martina M.D. | Chief Medical Offi… | SELL | $1M+ | 45K | $91.16 | Jun 12, 2025 |
| Schaeffer Orlov S Nicole | Chief People Strat… | EXERCISE | $1M+ | 108K | $15.06 | Jun 12, 2025 |
| Schaeffer Orlov S Nicole | Chief People Strat… | SELL | $1M+ | 137K | $92.09 | Jun 12, 2025 |
| Bonstein Sara | CFO | EXERCISE | $500K+ | 48K | $18.02 | Jun 12, 2025 |
| Bonstein Sara | CFO | SELL | $1M+ | 58K | $89.12 | Jun 12, 2025 |
| Smith Michael Alexander | Chief Legal Officer | SELL | $100K–$500K | 2K | $73.50 | Jun 6, 2025 |
| Smith Michael Alexander | Chief Legal Officer | SELL | $100K–$500K | 1K | $71.50 | Jun 4, 2025 |
| Flammer Martina M.D. | Chief Medical Offi… | SELL | $100K–$500K | 2K | $71.50 | Jun 4, 2025 |
| Adsett Roger | COO | SELL | $100K–$500K | 2K | $71.50 | Jun 4, 2025 |
| Bonstein Sara | CFO | SELL | $100K–$500K | 2K | $71.50 | Jun 4, 2025 |
| Schaeffer Orlov S Nicole | Chief People Strat… | SELL | $100K–$500K | 2K | $71.50 | Jun 4, 2025 |
| MCGIRR DAVID W J | Director | SELL | $100K–$500K | 6K | $72.25 | Jun 4, 2025 |
| Lewis William | Chair and CEO | SELL | $500K+ | 12K | $71.39 | Jun 4, 2025 |
| Lewis William | Chair and CEO | EXERCISE | $50K–$100K | 7K | $10.85 | Jun 4, 2025 |
| Smith Michael Alexander | Chief Legal Officer | SELL | $1M+ | 26K | $69.65 | Jun 3, 2025 |
| Desjardins Clarissa | Director | BUY | $100K–$500K | 3K | $66.68 | May 22, 2025 |
| Lewis William | Chair and CEO | SELL | $1M+ | 28K | $67.66 | May 22, 2025 |
| Lewis William | Chair and CEO | EXERCISE | $50K–$100K | 7K | $10.85 | May 22, 2025 |
| Flammer Martina M.D. | Chief Medical Offi… | SELL | $500K+ | 12K | $65.79 | May 19, 2025 |
| Flammer Martina M.D. | Chief Medical Offi… | GRANT | N/A | 7K | — | May 19, 2025 |
| Smith Michael Alexander | Chief Legal Officer | SELL | $100K–$500K | 5K | $67.62 | May 15, 2025 |
| Schaeffer Orlov S Nicole | Chief People Strat… | SELL | $100K–$500K | 6K | $67.37 | May 15, 2025 |
| Lewis William | Chair and CEO | SELL | $1M+ | 21K | $66.73 | May 15, 2025 |
| Flammer Martina M.D. | Chief Medical Offi… | SELL | $500K+ | 10K | $67.43 | May 15, 2025 |
| Bonstein Sara | CFO | SELL | $500K+ | 11K | $67.47 | May 15, 2025 |
| Adsett Roger | COO | SELL | $500K+ | 9K | $67.36 | May 15, 2025 |
| Lewis William | Chair and CEO | SELL | $100K–$500K | 7K | $72.57 | May 2, 2025 |
| Lewis William | Chair and CEO | EXERCISE | $50K–$100K | 7K | $10.85 | May 2, 2025 |
| Lewis William | Chair and CEO | SELL | $100K–$500K | 7K | $70.16 | Apr 16, 2025 |
| Lewis William | Chair and CEO | EXERCISE | $50K–$100K | 7K | $10.85 | Apr 16, 2025 |
| Lewis William | Chair and CEO | EXERCISE | $50K–$100K | 7K | $10.85 | Apr 3, 2025 |
| Lewis William | Chair and CEO | SELL | $500K+ | 7K | $73.58 | Apr 3, 2025 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 551 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| Darwin Global Management, Ltd. | 20.9M | $1M+ | SH |
| STATE STREET CORP | 5.2M | $1M+ | SH |
| Capital International Investors | 5.2M | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 3.8M | $1M+ | SH |
| NORGES BANK | 2.9M | $1M+ | SH |
| Duquesne Family Office LLC | 1.5M | $1M+ | SH |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1.2M | $1M+ | SH |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.2M | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.0M | $1M+ | SH |
| Pictet Asset Management Holding SA | 959K | $1M+ | SH |
| Jefferies Financial Group Inc. | 926K | $1M+ | SH |
| BNP PARIBAS FINANCIAL MARKETS | 915K | $1M+ | SH |
| Clearbridge Investments, LLC | 819K | $1M+ | SH |
| PRINCIPAL FINANCIAL GROUP INC | 767K | $1M+ | SH |
| LORD, ABBETT & CO. LLC | 715K | $1M+ | SH |
| Artia Global Partners LP | 682K | $1M+ | SH |
| VICTORY CAPITAL MANAGEMENT INC | 647K | $1M+ | SH |
| ALLIANCEBERNSTEIN L.P. | 643K | $1M+ | SH |
| Fiera Capital Corp | 589K | $1M+ | SH |
| Swiss National Bank | 579K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Jan 21, 2026
6.6%
14.1M shares
Darwin Global Management, Ltd.
SC 13G/A · Nov 14, 2025
9.7%
20.5M shares
T. Rowe Price Associates, Inc.
SC 13G/A · Nov 14, 2025
3.3%
6.9M shares
T. Rowe Price Associates, Inc.
SC 13G/A · Aug 14, 2025
5.9%
11.2M shares
SC 13G · Jul 30, 2025
7.9%
15.2M shares
SC 13G/A · Jul 18, 2025
5.1%
9.7M shares
Darwin Global Management, Ltd.
SC 13G/A · May 15, 2025
8.5%
15.4M shares
Darwin Global Management, Ltd.
SC 13G/A · Feb 14, 2025
7.2%
13.0M shares
SC 13G/A · Jan 8, 2025
10.2%
18.2M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Nov 14, 2024
7.3%
12.6M shares
Darwin Global Management, Ltd.
SC 13G · Sep 3, 2024
5.7%
9.7M shares
T. Rowe Price Investment Management, Inc. 85-4328500
SC 13G/A · Feb 16, 2024
4.1%
5.9M shares
T. Rowe Price Investment Management, Inc. 85-4328500
SC 13G · Feb 14, 2024
4.1%
5.9M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Feb 14, 2024
7.5%
10.8M shares
The Vanguard Group - 23-1945930
SC 13G/A · Feb 13, 2024
9.9%
14.1M shares
SC 13G/A · Jan 25, 2024
8.0%
11.5M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G/A · Jan 22, 2024
4.2%
0 shares
The Vanguard Group - 23-1945930
SC 13G/A · Nov 13, 2023
10.1%
14.4M shares
SC 13G/A · Feb 14, 2023
4.3%
5.9M shares
T. Rowe Price Investment Management, Inc. 85-4328500
SC 13G · Feb 14, 2023
6.2%
8.4M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Feb 14, 2023
7.4%
10.0M shares
SC 13G/A · Feb 3, 2023
8.2%
11.1M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G · Feb 3, 2023
5.1%
0 shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Aug 10, 2022
7.7%
9.2M shares
SC 13G/A · Feb 14, 2022
5.1%
6.0M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Feb 14, 2022
12.9%
15.3M shares
Janus Henderson Group plc EIN #00-0000000
SC 13G/A · Feb 10, 2022
6.7%
7.9M shares