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ASSEMBLY BIO (ASMB)
NASDAQ
$24.54-$0.04 (-0.14%)
Price as of Jun 03, 2026 4:15 PM EDT- $548.1MMarket Cap
- 61.12%1-Year Change
- BiotechnologyIndustry
ASSEMBLY BIO (ASMB)
$24.54-$0.04 (-0.14%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
GILEAD SCIENCES, INC. | 28.35% | 4.5M | 0 (0.00%) | Mar 31, 2026 |
SATTER MANAGEMENT CO., L.P. | 14.02% | 2.2M | 0 (0.00%) | Jun 30, 2022 |
CANDRIAM LUXEMBOURG S.C.A. | 11.57% | 1.8M | +369,375 (+20.09%) | Dec 31, 2021 |
FARALLON CAPITAL MANAGEMENT LLC | 7.72% | 1.2M | 0 (0.00%) | Mar 31, 2026 |
RA CAPITAL MANAGEMENT, L.P. | 6.42% | 1.0M | 0 (0.00%) | Mar 31, 2026 |
COMMODORE CAPITAL LP | 6.29% | 1.0M | 0 (0.00%) | Mar 31, 2026 |
JANUS HENDERSON GROUP PLC | 5.34% | 849,309 | +11,384 (+1.34%) | Mar 31, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD INDEX FUNDS | 17.85% | 2.8M | 0 (0.00%) | Mar 31, 2026 |
PRUDENTIAL SECTOR FUNDS, INC. | 10.23% | 1.6M | 0 (0.00%) | Aug 30, 2024 |
FIDELITY CONCORD STREET TRUST | 4.08% | 648,485 | 0 (0.00%) | Feb 28, 2026 |
SPDR SERIES TRUST | 3.65% | 579,311 | 0 (0.00%) | Jan 31, 2026 |
VANGUARD HORIZON FUNDS | 2.68% | 425,352 | 0 (0.00%) | Mar 31, 2026 |
FRANKLIN STRATEGIC SERIES | 2.40% | 381,295 | 0 (0.00%) | Jan 31, 2026 |
Federated Hermes MDT Series | 1.92% | 304,735 | 0 (0.00%) | Jan 31, 2026 |
Current Ownership Distribution
- Institutions185.5M (62.78%)
- Mutual Funds101.7M (34.43%)
- Insiders8.2M (2.79%)
- Other0 (0.00%)
Insider Transactions
- 2.79% (8.2M)Current InsiderOwnership (%, shares)
- 1Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 1Number of InsiderSelling (last 12 months)
- $592,032.38Amount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
GILEAD SCIENCES INC | Award | May 26, 2026 | $12.5M | 471,698 | $26.50 | 5.0M |
Bjorkquist Jeanette M PFO and PAO | Sell | Mar 30, 2026 | $8,314.86 | 312 | $26.65 | 11,105 |
Bjorkquist Jeanette M PFO and PAO | Sell | Mar 30, 2026 | $439.84 | 16 | $27.49 | 11,089 |
Okazaki Jason A CEO and President | Award | Mar 29, 2026 | $0.00 | 94,250 | $0.00 | 111,916 |
Delaney William E IV Chief Scientific Officer | Award | Mar 29, 2026 | $0.00 | 26,000 | $0.00 | 45,642 |
Gaggar Anuj Chief Medical Officer | Award | Mar 29, 2026 | $0.00 | 26,000 | $0.00 | 28,000 |
Bjorkquist Jeanette M PFO and PAO | Award | Mar 29, 2026 | $0.00 | 6,500 | $0.00 | 11,417 |
GILEAD SCIENCES INC | Buy | Aug 08, 2025 | $0.00 | 1.1M | $0.00 | 1.1M |
GILEAD SCIENCES INC | Buy | Aug 08, 2025 | $0.00 | 1.1M | $0.00 | 1.1M |
GILEAD SCIENCES INC | Buy | Aug 08, 2025 | $0.00 | 2.3M | $0.00 | 4.5M |
Bjorkquist Jeanette M PFO and PAO | Award | Jun 16, 2025 | $0.00 | 600 | $0.00 | 600 |
Bjorkquist Jeanette M PFO and PAO | Award | Jun 16, 2025 | $0.00 | 300 | $0.00 | 5,097 |
ALTIG ANTHONY E | Award | Jun 05, 2025 | $0.00 | 3,500 | $0.00 | 3,500 |
Houghton Michael | Award | Jun 05, 2025 | $0.00 | 3,500 | $0.00 | 3,500 |
Johnson-Pratt Lisa | Award | Jun 05, 2025 | $0.00 | 3,500 | $0.00 | 3,500 |
Consylman Gina | Award | Jun 05, 2025 | $0.00 | 3,500 | $0.00 | 3,500 |
Mahony Susan | Award | Jun 05, 2025 | $0.00 | 3,500 | $0.00 | 3,500 |
RINGO WILLIAM R | Award | Jun 05, 2025 | $0.00 | 3,500 | $0.00 | 3,500 |
McHutchison John G | Award | Jun 05, 2025 | $0.00 | 3,500 | $0.00 | 3,500 |
McHutchison John G | Sell | Mar 31, 2025 | $7,455.01 | 757 | $9.85 | 18,347 |
Okazaki Jason A CEO and President | Sell | Mar 31, 2025 | $3,496.08 | 355 | $9.85 | 14,757 |
White Nicole S Chief Manufacturing Officer | Sell | Mar 31, 2025 | $1,940.08 | 197 | $9.85 | 11,674 |
Bjorkquist Jeanette M Principal Accounting Officer | Sell | Mar 31, 2025 | $1,772.66 | 180 | $9.85 | 4,617 |
Gaggar Anuj Chief Medical Officer | Award | Mar 29, 2025 | $0.00 | 24,200 | $0.00 | 24,200 |
Delaney William E IV Chief Scientific Officer | Award | Mar 29, 2025 | $0.00 | 25,500 | $0.00 | 25,500 |
White Nicole S Chief Manufacturing Officer | Award | Mar 29, 2025 | $0.00 | 20,400 | $0.00 | 20,400 |
Okazaki Jason A CEO and President | Award | Mar 29, 2025 | $0.00 | 71,100 | $0.00 | 71,100 |
Bjorkquist Jeanette M Principal Accounting Officer | Award | Mar 29, 2025 | $0.00 | 1,900 | $0.00 | 1,900 |
Bjorkquist Jeanette M Principal Accounting Officer | Award | Mar 29, 2025 | $0.00 | 1,655 | $0.00 | 4,797 |
GILEAD SCIENCES INC | Buy | Dec 19, 2024 | $20.1M | 940,499 | $21.37 | 2.2M |