48% buyers of institutions opening or closing positions this quarter
1 more exits than new buyers, ownership fell 14.03 percentage points vs the prior quarter, and 1 well-known fund manager in the top 25.
48% buyers of institutions opening or closing positions this quarter
50.5% institutional ownership
PSP Research LLC portfolio allocation
Institutional ownership vs Medical - Diagnostics & Research peers
No Form 4 insider transactions on file
Latest positioning in SERA across 13F flow, ownership shift, marquee holders, and holder-count growth.
Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in SERA held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BAKER BROS. ADVISORS LP | 5.5M | $11.2M | 0.0% | 14.397% | 0.06% |
| 2 | Whetstone Capital Advisors, LLC | 3.3M | $6.7M | -4.4% | 8.659% | 2.33% |
| 3 | abrdn plc | 2.6M | $5.2M | +11.9% | 6.679% | 0.01% |
| 4 | PSP Research LLC | 2.4M | $4.9M | β | 6.276% | 3.44% |
| 5 | Vivo Capital, LLC | 1.7M | $3.4M | 0.0% | 4.322% | 0.28% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 1.2M | $2.4M | β | 3.153% | 0.00% |
| 7 | CAPTRUST FINANCIAL ADVISORS | 537K | $1.1M | 0.0% | 1.405% | 0.00% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 364K | $739K | +8.7% | 0.952% | 0.00% |
| 9 | SANDERS MORRIS HARRIS LLC | 315K | $639K | β | 0.825% | 0.10% |
| 10 | CITADEL ADVISORS LLC | 264K | $535K | -62.7% | 0.691% | 0.00% |
| 11 | AWM Investment Company, Inc. | 207K | $421K | 0.0% | 0.543% | 0.05% |
| 12 | BlackRock, Inc. | 196K | $398K | +5.0% | 0.513% | 0.00% |
| 13 | VANGUARD FIDUCIARY TRUST CO | 170K | $344K | β | 0.444% | 0.00% |
| 14 | STATE STREET CORP | 125K | $253K | 0.0% | 0.327% | 0.00% |
| 15 | MORGAN STANLEY | 105K | $213K | +29.7% | 0.275% | 0.00% |
| 16 | NORTHERN TRUST CORP | 97K | $196K | 0.0% | 0.253% | 0.00% |
| 17 | SEGALL BRYANT & HAMILL, LLC | 100K | $193K | β | 0.262% | 0.00% |
| 18 | MILLENNIUM MANAGEMENT LLC | 92K | $186K | -19.1% | 0.240% | 0.00% |
| 19 | Perigon Wealth Management, LLC | 73K | $148K | 0.0% | 0.190% | 0.00% |
| 20 | Bank of New York Mellon Corp | 61K | $124K | -19.1% | 0.160% | 0.00% |
| 21 | Requisite Capital Management, LLC | 56K | $113K | 0.0% | 0.146% | 0.02% |
| 22 | JANE STREET GROUP, LLC | 54K | $109K | -21.7% | 0.141% | 0.00% |
| 23 | Ballentine Partners, LLC | 50K | $101K | 0.0% | 0.130% | 0.00% |
| 24 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 46K | $93K | 0.0% | 0.120% | 0.00% |
| 25 | Twelve Points Wealth Management LLC | 43K | $88K | 0.0% | 0.114% | 0.02% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in SERA β a direct measure of their conviction.
Filings activity in SERA during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 56 | 1.8% | 50.49% | 14.03 pp | $40M | 22% |
| Q4 2025 | 57 | 8.1% | 64.52% | 4.51 pp | $52M | 6.5% |
| Q3 2025 | 62 | +3.3% | 69.03% | +5.09 pp | $55M | +8.0% |
| Q2 2025 | 60 | 15% | 63.94% | 25.62 pp | $51M | 29% |
| Q1 2025 | 71 | 4.1% | 89.56% | 91.52 pp | $72M | 51% |
| Q4 2024 | 74 | +21% | 181.08% | +6.07 pp | $145M | +3.5% |
| Q3 2024 | 61 | 4.7% | 175.01% | +54.77 pp | $140M | +46% |
| Q2 2024 | 64 | β | 120.24% | β | $96M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
No recent Form 4 insider transactions on file for SERA.
Quick answers to the most common questions about buying SERA stock.
Based on Q1 2026 13F filings, institutional ownership of Sera Prognostics, Inc. stands at 50.5%, held across 56 reporting institutions.
BAKER BROS. ADVISORS LP is the largest reported institutional holder of SERA, with approximately 5,498,170 shares worth $0.01B as of Q1 2026.
Yes β 1 widely-followed marquee investor appear among the top 25 institutional holders of SERA, including CITADEL ADVISORS LLC.
Our composite Smart Money Score for SERA is 36 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
12 institutions opened new positions in SERA during Q1 2026, while 13 fully exited. 1 added to existing positions and 42 trimmed.
SERA institutional ownership fell by 14.03 percentage points quarter-over-quarter, with a net change of β holders.
The top 10 institutions account for 90.7% of all reported 13F value in SERA, and the top 25 account for 98.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.