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SPERO THERAPETCS (SPRO)
NASDAQ
$2.17+$0.02 (+0.70%)
Price as of Jun 23, 2026 7:50 PM EDT- $128.0MMarket Cap
- -25.35%1-Year Change
- BiotechnologyIndustry
SPERO THERAPETCS (SPRO)
$2.17+$0.02 (+0.70%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
GSK PLC | 15.87% | 9.2M | 0 (0.00%) | Mar 31, 2026 |
PFIZER INC | 4.08% | 2.4M | 0 (0.00%) | Mar 31, 2026 |
VANGUARD GROUP INC | 3.60% | 2.1M | +93,607 (+4.49%) | Dec 31, 2025 |
N/A | 3.11% | 1.8M | +1.8M (+100.00%) | Mar 31, 2026 |
ATLAS VENTURE ASSOCIATES XI, LLC | 2.38% | 1.4M | +1.4M (+100.00%) | Dec 31, 2020 |
ATLAS VENTURE ASSOCIATES IX, LLC | 2.34% | 1.4M | 0 (0.00%) | Sep 30, 2023 |
RENAISSANCE TECHNOLOGIES LLC | 2.05% | 1.2M | -90,287 (-7.59%) | Mar 31, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
JOHN HANCOCK SOVEREIGN BOND FUND | 18.38% | 10.6M | -27,148 (-0.26%) | Feb 28, 2026 |
JOHN HANCOCK BOND TRUST | 5.93% | 3.4M | -9,015 (-0.26%) | Feb 28, 2026 |
JACKSON VARIABLE SERIES TRUST | 5.17% | 3.0M | -7,500 (-0.25%) | Mar 31, 2020 |
NUVEEN INVESTMENT FUNDS INC | 3.08% | 1.8M | 0 (0.00%) | Mar 31, 2026 |
John Hancock Exchange-Traded Fund Trust | 3.04% | 1.8M | +1.8M (+100.00%) | Mar 31, 2026 |
VANGUARD INDEX FUNDS | 3.03% | 1.8M | 0 (0.00%) | Mar 31, 2026 |
JOHN HANCOCK VARIABLE INSURANCE TRUST | 2.75% | 1.6M | -1.3M (-81.45%) | Mar 31, 2026 |
Current Ownership Distribution
- Mutual Funds324.2M (50.04%)
- Institutions296.4M (45.76%)
- Insiders27.2M (4.19%)
- Other0 (0.00%)
Insider Transactions
- 4.19% (27.2M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 3Number of InsiderSelling (last 12 months)
- $16.6MAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
Keutzer Timothy Chief Operating Officer | Sell | Feb 06, 2026 | $44,018.72 | 18,652 | $2.36 | 742,506 |
Rajavelu Esther See Remarks | Sell | Feb 06, 2026 | $87,558.36 | 37,101 | $2.36 | 1.1M |
Rajavelu Esther See Remarks | Sell | Feb 06, 2026 | $119,925.76 | 50,816 | $2.36 | 1.0M |
Keutzer Timothy Chief Operating Officer | Sell | Feb 04, 2026 | $7,775.04 | 3,471 | $2.24 | 761,158 |
Keutzer Timothy Chief Operating Officer | Sell | Feb 03, 2026 | $51,839.36 | 24,224 | $2.14 | 764,629 |
Rajavelu Esther See Remarks | Award | Feb 02, 2026 | $0.00 | 498,000 | $0.00 | 498,000 |
Keutzer Timothy Chief Operating Officer | Award | Feb 02, 2026 | $0.00 | 137,000 | $0.00 | 137,000 |
Rajavelu Esther See Remarks | Award | Feb 02, 2026 | $0.00 | 249,000 | $0.00 | 1.1M |
Keutzer Timothy Chief Operating Officer | Award | Feb 02, 2026 | $0.00 | 68,000 | $0.00 | 807,744 |
Rajavelu Esther See Remarks | Sell | Feb 02, 2026 | $40,572.40 | 18,442 | $2.20 | 1.1M |
Keutzer Timothy Chief Operating Officer | Sell | Feb 02, 2026 | $41,560.20 | 18,891 | $2.20 | 788,853 |
Mahadevia Ankit | Sell | Aug 28, 2025 | $12,946.84 | 6,572 | $1.97 | 703,294 |
Keutzer Timothy Chief Operating Officer | Sell | Aug 28, 2025 | $3,339.15 | 1,695 | $1.97 | 739,744 |
THOMAS FRANK E | Award | Jun 12, 2025 | $0.00 | 20,000 | $0.00 | 75,000 |
Tregoning Kathleen | Award | Jun 12, 2025 | $0.00 | 20,000 | $0.00 | 75,000 |
Pottage John C Jr | Award | Jun 12, 2025 | $0.00 | 20,000 | $0.00 | 75,000 |
Smith Cynthia | Award | Jun 12, 2025 | $0.00 | 20,000 | $0.00 | 75,000 |
VINK PATRICK V.J.J. | Award | Jun 12, 2025 | $0.00 | 20,000 | $0.00 | 75,000 |
Deshpande Milind | Award | Jun 12, 2025 | $0.00 | 20,000 | $0.00 | 91,454 |
Mahadevia Ankit | Award | Jun 12, 2025 | $0.00 | 20,000 | $0.00 | 709,866 |
Rajavelu Esther See Remarks | Award | May 02, 2025 | $0.00 | 185,000 | $0.00 | 909,720 |
Keutzer Timothy Chief Operating Officer | Sell | Feb 05, 2025 | $3,099.72 | 3,974 | $0.78 | 794,002 |
Shukla Sath CEO & President | Sell | Feb 05, 2025 | $4,788.42 | 6,139 | $0.78 | 1.9M |
Mahadevia Ankit | Sell | Feb 05, 2025 | $10,888.02 | 13,959 | $0.78 | 745,126 |
Rajavelu Esther CFO & CBO | Sell | Feb 05, 2025 | $16,137.42 | 20,689 | $0.78 | 724,720 |
Keutzer Timothy Chief Operating Officer | Sell | Feb 05, 2025 | $21,561.54 | 27,643 | $0.78 | 766,359 |
Shukla Sath CEO & President | Sell | Feb 05, 2025 | $33,373.08 | 42,786 | $0.78 | 1.8M |
Mahadevia Ankit | Sell | Feb 05, 2025 | $43,102.80 | 55,260 | $0.78 | 689,866 |
Shukla Sath CEO & President | Sell | Feb 05, 2025 | $82,998.24 | 106,408 | $0.78 | 1.7M |
Keutzer Timothy Chief Operating Officer | Sell | Feb 05, 2025 | $19,437.60 | 24,920 | $0.78 | 741,439 |