Sera Prognostics, Inc.: which funds bought and sold

Institutions that bought and sold Sera Prognostics shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 10 institutions that filed 13F reports for both quarters added to or opened positions in Sera Prognostics, and 22 cut or closed them. Together they sold a net 2.9M shares, −14.5% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 225K shares (−3.8%); index fund managers were net buyers of 66K shares (+3.0%). 0 opened a new position and 9 sold out entirely.

Bought, Q2 2026 10 institutions, 0 of them new holders Sold, Q2 2026 22 institutions, 9 of them sold out

Net change, all compared −2.9M shares (−14.5%)

Net change, active managers −225K shares (−3.8%), 2 bought, 5 sold

Buyers versus sellers

institutions compared, 53

10 bought 21 22 sold

Active managers and hedge funds 2 bought · 5 sold · −225K

Index fund managers 3 bought · 3 sold · +66K

Other institutions 5 bought · 14 sold · −2.7M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Aberdeen Group PLC	+203K +7.9%	2.8M	$5M
Vanguard Capital Management LLC Index funds	+94K +7.8%	1.3M	$2.4M
Qube Research & Technologies Ltd Hedge fund	+31K +155.4%	51K	$92,585
Blackrock, Inc. Index funds	+25K +12.9%	221K	$402,891
Catalyst Funds Management Pty Ltd	+15K +65.0%	39K	$70,780
Goldman Sachs Group Inc	+14K +76.2%	33K	$59,225
Bridgeway Capital Management, LLC Active manager	+10K +21.9%	56K	$101,383
Dimensional Fund Advisors LP	+9,964 +51.0%	29K	$53,652
Vanguard Fiduciary Trust Co Index funds	+1,247 +0.7%	171K	$311,053
Xtx Topco Ltd	+317 +1.9%	17K	$30,591

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Qube Research & Technologies Ltd Hedge fund	+31K +155.4%	51K	$92,585
Bridgeway Capital Management, LLC Active manager	+10K +21.9%	56K	$101,383

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
PSP Research LLC	−2.4M Sold out	0	—
Sanders Morris Harris LLC	−315K Sold out	0	—
Citadel Advisors LLC Hedge fund	−207K −83.4%	41K	$75,368
Gsa Capital Partners LLP	−105K Sold out	0	—
Morgan Stanley	−54K −51.5%	51K	$92,769
Jane Street Group, LLC	−54K Sold out	0	—
Squarepoint Ops LLC Hedge fund	−31K Sold out	0	—
Barclays PLC	−29K −90.1%	3,179	$5,786
Northern Trust Corp Index funds	−28K −28.9%	69K	$124,843
Millennium Management LLC Hedge fund	−18K −19.1%	74K	$134,655
Geode Capital Management, LLC Index funds	−15K −4.0%	349K	$635,473
Arkadios Wealth Advisors	−12K Sold out	0	—
Charles Schwab Investment Management Inc Index funds	−12K Sold out	0	—
Two Sigma Investments, LP Hedge fund	−5,743 −26.1%	16K	$29,522
FMR LLC Active manager	−4,034 −61.4%	2,539	$4,621
UBS Group AG	−3,560 −23.9%	11K	$20,583
Captrust Financial Advisors	−1,006 −0.2%	536K	$975,074
Optiver Holding B.V.	−412 Sold out	0	—
Wealth Enhancement Advisory Services, LLC	−54 −0.5%	11K	$20,693
BNP Paribas Financial Markets	−50 −21.2%	186	$339

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Citadel Advisors LLC Hedge fund	−207K −83.4%	41K	$75,368
Squarepoint Ops LLC Hedge fund	−31K Sold out	0	—
Millennium Management LLC Hedge fund	−18K −19.1%	74K	$134,655
Two Sigma Investments, LP Hedge fund	−5,743 −26.1%	16K	$29,522
FMR LLC Active manager	−4,034 −61.4%	2,539	$4,621

New positions

largest by value

Institution	Shares	Value June 30, 2026
No institution opened a new position.

Sold out

largest by value

Institution	Shares	Value March 31, 2026
PSP Research LLC	2.4M	$4.9M
Sanders Morris Harris LLC	315K	$639,349
Gsa Capital Partners LLP	105K	$213,000
Jane Street Group, LLC	54K	$109,433
Squarepoint Ops LLCHedge fund	31K	$63,799
Arkadios Wealth Advisors	12K	$25,172
Charles Schwab Investment Management IncIndex funds	12K	$24,533
Optiver Holding B.V.	412	$836
Advisory Services Network, LLC	19	$39

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 45
Ten largest holders: 93.8%
Index fund managers: 13.1%
Active managers and hedge funds: 33.6%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	Sold out	Net change in shares	Net %
Active managers and hedge funds	2	5	1	−225K	−3.8%
Index fund managers	3	3	1	+66K	+3.0%
Other institutions	5	14	7	−2.7M	−23.1%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Sera Prognostics.

Only managers that filed a holdings report for both quarters are compared (53 here). 3 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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