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Equibles

SERA

Sera Prognostics, Inc.

Company with tickers: SERA

CIK
1534969
CUSIP
81749D107
Shares Outstanding
38,190,966
13F Activity (30d)
5 filings 4 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 56
Total Value: $40,518,127
Total Shares: 19,959,681

Institutional Ownership Trend

21 quarters

Holder Concentration

Across 56 13F filers · Δ vs Dec 31, 2025
Top Holder
27.5%
Dec 2023 → Mar 2026 · range 27.2% – 49.2%
−3.6 pts
Top 5
77.2%
Dec 2023 → Mar 2026 · range 64.2% – 80.1%
−2.9 pts
Top 10
90.6%
Dec 2023 → Mar 2026 · range 84.2% – 91.3%
−0.7 pts
HHI
1,465
Dec 2023 → Mar 2026 · range 1,232 – 2,759
Broadly held−230

Quarterly Activity

vs Dec 31, 2025
New
11
Increased
6
Decreased
17
Sold Out
12
Unchanged
22
Holder count: -1
Institutional value: -34.9%
Shares held: -5.4%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Large Aberdeen Group plc +271,076 2,550,775
Mega GEODE CAPITAL MANAGEMENT, LLC +28,978 363,617
Mega MORGAN STANLEY +24,049 105,017
Mega BlackRock, Inc. +9,354 196,105
Mid Geneos Wealth Management Inc. +3,000 10,800

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Small Whetstone Capital Advisors, LLC −3,612,537 3,306,889
Mega CITADEL ADVISORS LLC −443,905 263,709
Mega MILLENNIUM MANAGEMENT LLC −21,674 91,504
Mega JANE STREET GROUP, LLC −14,918 53,908
Mega Bank of New York Mellon Corp −14,340 60,927

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Micro PSP Research LLC 2,396,685 $4,865,270
Mega VANGUARD CAPITAL MANAGEMENT LLC 1,204,115 $2,444,353
Small SANDERS MORRIS HARRIS LLC 314,950 $639,348
Mega VANGUARD FIDUCIARY TRUST CO 169,661 $344,411
Small Catalyst Funds Management Pty Ltd 23,564 $47,834

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 1,239,449 $3,656,373
Large Corient Private Wealth LLC 100,000 $295,000
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP 71,532 $211,019
Large Lido Advisors, LLC 16,623 $49,037
Large Point72 Asset Management, L.P. 11,403 $33,638
Filter: New 11 Increased 6 Reduced 17 Sold out 12 Unchanged 22
Showing 57 of 57
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Large BAKER BROS. ADVISORS LP $11,161,285 27.55% 5,498,170
Small Whetstone Capital Advisors, LLC $6,712,984 16.57% 3,306,889
Large Aberdeen Group plc $5,178,073 12.78% 2,550,775
Micro PSP Research LLC $4,865,270 12.01% 2,396,685
Mid Vivo Capital, LLC $3,350,393 8.27% 1,650,440
Mega VANGUARD CAPITAL MANAGEMENT LLC $2,444,353 6.03% 1,204,115
Large CAPTRUST FINANCIAL ADVISORS $1,089,624 2.69% 536,761
Mega GEODE CAPITAL MANAGEMENT, LLC $738,142 1.82% 363,617
Small SANDERS MORRIS HARRIS LLC $639,348 1.58% 314,950
Mega CITADEL ADVISORS LLC $505,285 1.25% 248,909
Small AWM Investment Company, Inc. $420,985 1.04% 207,382
Mega BlackRock, Inc. $398,092 0.98% 196,105
Mega VANGUARD FIDUCIARY TRUST CO Bank $344,411 0.85% 169,661
Mega STATE STREET CORP $253,327 0.63% 124,792
Mega MORGAN STANLEY $213,184 0.53% 105,017
Mid GSA CAPITAL PARTNERS LLP $213,095 0.53% 104,973
Mega NORTHERN TRUST CORP Bank $195,966 0.48% 96,535
Mega MILLENNIUM MANAGEMENT LLC $185,753 0.46% 91,504
Mid Perigon Wealth Management, LLC $147,550 0.36% 72,685
Mega Bank of New York Mellon Corp Bank $123,681 0.31% 60,927
Small Requisite Capital Management, LLC $112,965 0.28% 55,648
Mega JANE STREET GROUP, LLC $109,432 0.27% 53,908
Mid Ballentine Partners, LLC $100,817 0.25% 49,664
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $92,781 0.23% 45,705
Small Twelve Points Wealth Management LLC $88,077 0.22% 43,388
Large HighTower Advisors, LLC $85,735 0.21% 42,234
Mega BARCLAYS PLC $64,893 0.16% 31,967
Large Squarepoint Ops LLC $63,798 0.16% 31,428
Mid Birch Hill Investment Advisors LLC $55,404 0.14% 27,293
Large Cetera Investment Advisers $50,750 0.13% 25,000
Small Catalyst Funds Management Pty Ltd $47,834 0.12% 23,564
Mega TWO SIGMA INVESTMENTS, LP $44,586 0.11% 21,964
Large Qube Research & Technologies Ltd $40,431 0.10% 19,917
Mega DIMENSIONAL FUND ADVISORS LP $39,655 0.10% 19,535
Mega GOLDMAN SACHS GROUP INC $37,498 0.09% 18,472
Mid XTX Topco Ltd $33,476 0.08% 16,491
Mega UBS Group AG $30,184 0.07% 14,869
Mega CITADEL ADVISORS LLC $30,044 0.07% 14,800
Small Riverview Capital Advisers, LLC $25,718 0.06% 12,669
Mid Arkadios Wealth Advisors $25,172 0.06% 12,400
Small Wagner Wealth Management, LLC $25,172 0.06% 12,400
Large Focus Partners Wealth $24,676 0.06% 12,156
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $24,532 0.06% 12,085
Mega Vanguard Global Advisers, LLC $22,673 0.06% 11,169
Mid Geneos Wealth Management Inc. $21,924 0.05% 10,800
Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $21,432 0.05% 10,558
Mega FMR LLC $13,343 0.03% 6,573
Large CWM, LLC $2,036 0.01% 1,003
Mid Optiver Holding B.V. $836 0.00% 412
Mega BNP PARIBAS ARBITRAGE, SA $479 0.00% 236
Mega JPMORGAN CHASE & CO $450 0.00% 222
Large NISA INVESTMENT ADVISORS, LLC $261 0.00% 129
Small Silicon Valley Capital Partners $115 0.00% 57
Mega ROYAL BANK OF CANADA Bank $87 0.00% 43
Mid Advisory Services Network, LLC $38 0.00% 19
Mid SBI Securities Co., Ltd. Broker-Dealer $14 0.00% 7
Small Caitong International Asset Management Co., Ltd $8 0.00% 4

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