Seer
Provides the Proteograph platform for deep, unbiased proteomics research.
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Breakdown13F · Form 4
Institutions 38.81%21.34M sharesInsiders 13.71%7.54M sharesOther 47.48%26.11M shares
Shares outstanding 54.98M · Float 40.14M · 73.0% free float
Institutions13F, as of Mar 31, 2026
58 holders · 21.34M shares · 10 new positions · 20 increased · 21 reduced · 15 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| SoftBank Group Corp. | 5.14M | 9.34% | 0 | May 15, 2026 |
| Siren, L.L.C. | 2.46M | 4.47% | −1.54M | May 14, 2026 |
| Acadian Asset Management LLC | 2.07M | 3.77% | +33.5K | May 13, 2026 |
| Vanguard Capital Management LLC | 1.96M | 3.56% | +1.96Mnew | May 15, 2026 |
| BlackRock, Inc. | 1.82M | 3.31% | −5.5K | May 13, 2026 |
| Renaissance Technologies LLC | 976.7K | 1.78% | −74.7K | May 14, 2026 |
| Nano Cap New Millennium Growth Fund L P | 825.0K | 1.50% | 0 | May 15, 2026 |
| Aju Ib Investment Co., Ltd. | 816.4K | 1.48% | 0 | May 8, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Omid Farokhzad | 12.00% | 6.92M | 13G | May 15, 2026 ↗ |
| Schindel Yair Chaim | 8.35% | 4.92M | 13G | Jan 8, 2025 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Omid Farokhzad | director, officer: CEO AND CHAIR | 5.47M | 9.94% | Feb 19, 2026 |
| Robert Langer | director | 821.0K | 1.49% | Jul 30, 2026 |
| David R. Horn | officer: PRESIDENT & CFO | 486.7K | 0.89% | Aug 19, 2026 |
| Terrance Mcguire | director | 343.6K | 0.63% | Jul 30, 2026 |
| Meeta Gulyani | director | 124.0K | 0.23% | Jul 30, 2026 |
| Nicolas H. PHD Roelofs | director | 91.5K | 0.17% | Jul 30, 2026 |
| Dipchand Nishar | director | 75.5K | 0.14% | Jul 30, 2026 |
| Anthony R. Bazarko | officer: Chief Commercial Officer | 75.0K | 0.14% | May 11, 2026 |
| Isaac Ro | director | 53.4K | 0.10% | Jul 30, 2026 |
5 ten-percent owners hold 14.19M shares by Form 4, outside the officers-and-directors figure above · 8 people have not refiled in the last 18 months (3.52M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 18, 2026 | David R. Hornofficer: PRESIDENT & CFO | Sale | 7,309 | $2.03 | 486,650 |
| Jul 8, 2026 | Dipchand Nishardirector | Sale | 10,660 | $2.18 | 59,044 |
| May 20, 2026 | David R. Hornofficer: PRESIDENT & CFO | Sale | 7,303 | $1.69 | 493,959 |
| Feb 18, 2026 | Omid Farokhzaddirector, officer: CEO AND CHAIR | Sale | 24,385 | $1.99 | 3,349,064 |
| Feb 18, 2026 | David R. Hornofficer: PRESIDENT & CFO | Sale | 7,743 | $1.99 | 501,262 |
| Nov 19, 2025 | Omid Farokhzaddirector, officer: CEO AND CHAIR | Sale | 33,838 | $1.97 | 1,238,230 |
| Nov 19, 2025 | David R. Hornofficer: PRESIDENT & CFO | Sale | 6,797 | $1.97 | 436,802 |
CongressHouse and Senate disclosures
Not reported.