Spero Therapeutics (SPRO)
Develops SP001 while retaining economics linked to GSK-marketed Utebzi.
$1.22
At close+0.02 (+1.67%)
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Breakdown13F · 13D/G · Form 4
| Institutions55 holders · as of Mar 31, 2026 | 35.45% | 20.64M shares | |
| Insiders12 holders · as of Aug 6, 2026 | 8.49% | 4.94M shares | |
| Otherremainder | 56.06% | 32.65M shares |
58.23M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing
Institutions13F, as of Mar 31, 2026
55 holders · 20.64M shares · 8 new positions · 20 increased · 11 reduced · 14 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| GSK PLC | 9.19M | 15.78% | 0 | May 14, 2026 |
| Pfizer Inc | 2.36M | 4.06% | 0 | May 12, 2026 |
| Vanguard Capital Management LLC | 1.80M | 3.09% | +1.80Mnew | May 15, 2026 |
| Renaissance Technologies LLC | 1.19M | 2.04% | −90.3K | May 14, 2026 |
| Alphabet Inc. | 890.0K | 1.53% | 0 | May 8, 2026 |
| Two Sigma Investments, LP | 885.6K | 1.52% | +513.1K | May 15, 2026 |
| Geode Capital Management, LLC | 519.9K | 0.89% | −9.3K | May 15, 2026 |
| BlackRock, Inc. | 433.2K | 0.74% | −414 | May 13, 2026 |
Ownership statements13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| GSK PLC | 16.40% | 9.19M | 13D | Mar 28, 2025 ↗ |
Insider tradesForm 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| May 4, 2026 | Esther Rajaveluofficer: See Remarks | Sale | 25,240 | $2.51 | 986,851 |
| Feb 6, 2026 | Timothy Keutzerofficer: Chief Operating Officer | Sale | 18,652 | $2.36 | 742,506 |
| Feb 6, 2026 | Esther Rajaveluofficer: See Remarks | Sale · 2 lots | 87,917 | $2.36 | 1,012,091 |
| Feb 4, 2026 | Timothy Keutzerofficer: Chief Operating Officer | Sale | 3,471 | $2.24 | 761,158 |
| Feb 3, 2026 | Timothy Keutzerofficer: Chief Operating Officer | Sale | 24,224 | $2.14 | 764,629 |
| Feb 2, 2026 | Timothy Keutzerofficer: Chief Operating Officer | Sale | 18,891 | $2.20 | 788,853 |
| Feb 2, 2026 | Esther Rajaveluofficer: See Remarks | Sale | 18,442 | $2.20 | 1,100,008 |
| Nov 7, 2025 | Esther Rajaveluofficer: See Remarks | Sale | 40,270 | $2.37 | 869,450 |
| Aug 28, 2025 | Timothy Keutzerofficer: Chief Operating Officer | Sale | 1,695 | $1.97 | 739,744 |
| Aug 28, 2025 | Ankit Mahadeviadirector | Sale | 6,572 | $1.97 | 703,294 |
CongressHouse and Senate disclosures
Not reported.