Sera Prognostics, Inc. (SERA) shareholders
SERANasdaqServices-Medical LaboratoriesFiscal year ends December 31
$2.01+0.03 (+1.52%)
Close on Nov 13, 2026Market cap $79.29MP/E –Yield –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
43.2%
17M of 39M shares
Institutional holders
46
1 new, 9 sold out
Net institutional buying
-3M
In Q2 2026
Insider trades, 12 months
0 buys · 44 sales
Net sold $530.87K
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Julian C. Baker Joint filing with Baker Bros. Advisors LP (16.10%), Baker Bros. Advisors (GP) LLC (16.10%) and 1 more | 5,498,170 | 16.10% | 13D (active) | Feb 12, 2025 |
| David Atterbury Joint filing with Whetstone Capital Advisors, LLC (9.90%) | 3,632,371 | 9.90% | 13G (passive) | Jun 30, 2025 |
| Whetstone Capital Advisors, LLC Joint filing with David Atterbury (8.60%) | 3,306,889 | 8.60% | 13G (passive) amendment | Mar 31, 2026 |
| Aberdeen Group plc Joint filing with abrdn Inc. (7.21%) | 2,753,525 | 7.21% | 13G (passive) amendment | Jun 30, 2026 |
| Andreas Hadjimichael Joint filing with Chione Ltd. (7.60%), Marcin Czernik (7.60%) and 2 more | 2,605,351 | 7.60% | 13D (active) amendment | Feb 11, 2025 |
| abrdn Inc. Joint filing with Aberdeen Group plc (6.07%) | 2,227,367 | 6.07% | 13G (passive) | Jun 30, 2025 |
| Dr. Yair C. Schindel Joint filing with aMoon Growth Fund Limited Partnership (5.73%), aMoon Growth Fund G.P. Limited Partnership (5.73%) and 1 more | 1,911,332 | 5.73% | 13G (passive) amendment | Sep 30, 2024 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of SERA | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Baker Bros. Advisors LP | 5,498,170 | 13.94% | $10.01M | – | 0.05% |
| Whetstone Capital Advisors, LLC | 3,306,889 | 8.38% | $6.02M | – | 1.58% |
| abrdn plc | 2,753,525 | 6.98% | $5.01M | +202,750 | 0.01% |
| Vivo Capital, LLC | 1,650,440 | 4.18% | $3.00M | – | 0.27% |
| Vanguard Capital Management LLC | 1,297,792 | 3.29% | $2.36M | +93,677 | 0.00% |
| Captrust Financial Advisors | 535,755 | 1.36% | $975.07K | −1,006 | 0.00% |
| Geode Capital Management, LLC | 348,967 | 0.88% | $635.47K | −14,650 | 0.00% |
| BlackRock, Inc. | 221,369 | 0.56% | $402.89K | +25,264 | 0.00% |
| AWM Investment Company, Inc. | 207,382 | 0.53% | $377.44K | – | 0.03% |
| Vanguard Fiduciary Trust Co | 170,908 | 0.43% | $311.05K | +1,247 | 0.00% |
| State Street Corp | 124,792 | 0.32% | $227.12K | – | 0.00% |
| Millennium Management LLC | 73,986 | 0.19% | $134.66K | −17,518 | 0.00% |
| Perigon Wealth Management, LLC | 72,685 | 0.18% | $132.29K | – | 0.00% |
| Northern Trust Corp | 68,595 | 0.17% | $124.84K | −27,940 | 0.00% |
| Bank of New York Mellon Corp | 60,927 | 0.15% | $110.89K | – | 0.00% |
| Bridgeway Capital Management, LLC | 55,705 | 0.14% | $101.38K | +10,000 | 0.00% |
| Requisite Capital Management, LLC | 55,648 | 0.14% | $101.28K | – | 0.02% |
| Morgan Stanley | 50,972 | 0.13% | $92.77K | −54,045 | 0.00% |
| Qube Research & Technologies Ltd | 50,871 | 0.13% | $92.59K | +30,954 | 0.00% |
| Ballentine Partners, LLC | 49,664 | 0.13% | $90.39K | – | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 46 | 17M | 43.2% | 1 / 11 | 13 / 9 | 0M | 3M |
| Q1 2026 | 56 | 20M | 50.6% | 11 / 6 | 17 / 11 | 4M | 1M |
| Q4 2025 | 57 | 18M | 45.0% | 6 / 15 | 15 / 8 | 0M | 1M |
| Q3 2025 | 62 | 18M | 46.0% | 12 / 17 | 11 / 9 | 0M | 1M |
| Q2 2025 | 59 | 19M | 47.2% | 13 / 14 | 26 / 24 | 5M | 7M |
| Q1 2025 | 71 | 20M | 51.3% | 9 / 24 | 21 / 10 | 3M | 1M |
| Q4 2024 | 73 | 18M | 45.9% | 18 / 28 | 12 / 6 | 1M | 2M |
| Q3 2024 | 61 | 19M | 47.9% | 14 / 18 | 12 / 17 | 4M | 1M |
| Q2 2024 | 65 | 17M | 42.1% | 25 / 18 | 15 / 12 | 4M | 2M |
| Q1 2024 | 52 | 15M | 37.5% | 17 / 18 | 8 / 11 | 5M | 1M |
| Q4 2023 | 47 | 11M | 28.2% | 23 / 13 | 7 / 3 | 6M | 1M |
| Q3 2023 | 28 | 9M | 22.5% | 1 / 7 | 6 / 6 | 0M | 1M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
19 funds held SERA in Q2 2026, 76% of their shares through ETFs. Each fund counts once per quarter, from its quarter-end report.
| Fund | Shares | % of SERA | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 887,016 | 2.25% | $1.61M | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 380,212 | 0.96% | $691.99K | 0.00% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 172,649 | 0.44% | $372.92K | 0.00% | May 31, 2026 |
| iShares Micro-Cap ETF | 102,359 | 0.26% | $186.29K | 0.01% | Jun 30, 2026 |
| Ultra-Small Company Market Fund | 51,105 | 0.13% | $93.01K | 0.06% | Jun 30, 2026 |
| Fidelity Total Market Index Fund | 50,639 | 0.13% | $109.38K | 0.00% | May 31, 2026 |
| Fidelity Series Total Market Index Fund | 43,469 | 0.11% | $93.89K | 0.00% | May 31, 2026 |
| Fidelity Nasdaq Composite Index Fund | 23,191 | 0.06% | $50.09K | 0.00% | May 31, 2026 |
| Goldman Sachs Absolute Return Tracker Fund | 21,836 | 0.06% | $39.74K | 0.00% | Jun 30, 2026 |
| Vanguard Institutional Total Stock Market Index Fund | 18,716 | 0.05% | $34.06K | 0.00% | Jun 30, 2026 |
| Vanguard Balanced Index Fund | 11,848 | 0.03% | $21.56K | 0.00% | Jun 30, 2026 |
| 1290 VT Micro Cap Portfolio | 6,968 | 0.02% | $12.68K | 0.01% | Jun 30, 2026 |
| Avantis U.S. Small Cap Equity ETF | 5,403 | 0.01% | $11.67K | 0.00% | May 31, 2026 |
| Dimensional US Core Equity 1 ETF | 5,101 | 0.01% | $10.41K | 0.00% | Jul 31, 2026 |
| JNL/DFA U.S. Small Cap Fund | 3,288 | 0.01% | $5.98K | 0.00% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Zhenya Lindgardt | Chief Executive Officer, Director | 837,848 | 2.12% | Sep 11, 2026 |
| Tiffany Eul Davis Inglis | Chief Medical Officer | 83,565 | 0.21% | Oct 13, 2026 |
| Benjamin Jackson | General Counsel | 159,566 | 0.40% | Sep 11, 2026 |
| Dyaarl Lee Anderson Jr. | Chief Commercial Officer | 76,198 | 0.19% | Sep 11, 2026 |
| Austin Aerts | Chief Financial Officer | 301,190 | 0.76% | Sep 2, 2026 |
| Scott Gleason | Chief Financial Officer | 117,924 | 0.30% | Sep 1, 2026 |
| John J. Boniface | Chief Scientific Officer | 145,842 | 0.37% | May 6, 2026 |
| Robert Gardner Harrison | Chief Information Officer | 76,712 | 0.19% | May 6, 2026 |
| Paul Kearney | Chief Data Officer | 163,961 | 0.42% | May 6, 2026 |
| Kim P. Kamdar | Director | 54,999 | 0.14% | Jul 14, 2026 |
| Mark Christopher Capone | Director | 42,404 | 0.11% | Jul 14, 2026 |
| Gregory C. Critchfield | Director | 1,477,718 | 3.75% | Jul 14, 2026 |
| Sandra AJ Lawrence | Director | 38,899 | 0.10% | Jul 14, 2026 |
| Joshua Phillips | Director | 81,691 | 0.21% | Jul 14, 2026 |
| Jane F. Barlow | Director | 45,139 | 0.11% | Jul 14, 2026 |
| Mansoor Raza Mirza | Director | 80,166 | 0.20% | Jul 14, 2026 |
| Jeffrey Thomas Elliott | Director | 30,534 | 0.08% | Jun 4, 2026 |
| Ryan Trimble | Director | 74,557 | 0.19% | Jun 30, 2025 |
| Marcus Dean Wilson | Director | 7,117 | 0.02% | Jun 6, 2025 |
| Bros. Advisors (GP) LLC Baker | 10% owner | – | – | Feb 14, 2025 |
| Bros. Advisors Lp Baker | 10% owner | – | – | Feb 14, 2025 |
| Felix Baker | 10% owner | 5,065,736 | 12.84% | Feb 14, 2025 |
| Julian Baker | 10% owner | – | – | Feb 14, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Tiffany Eul Davis Inglis Chief Medical Officer | Oct 12, 2026 | Sale | −8,024 | $2.03 | $16.29K | 83,565 |
| Dyaarl Lee Anderson Jr. Chief Commercial Officer | Sep 10, 2026 | Sale | −1,800 | $2.00 | $3.60K | 76,198 |
| Benjamin Jackson General Counsel | Sep 10, 2026 | Sale | −2,190 | $2.00 | $4.38K | 159,566 |
| Zhenya Lindgardt Chief Executive Officer, Director | Sep 10, 2026 | Sale | −7,022 | $2.00 | $14.04K | 837,848 |
| Tiffany Eul Davis Inglis Chief Medical Officer | Sep 10, 2026 | Sale | −486 | $2.00 | $972 | 91,589 |
| Zhenya Lindgardt Chief Executive Officer, Director | Sep 8, 2026 | Sale | −20,139 | $2.00 | $40.28K | 844,870 |
| Scott Gleason Chief Financial Officer | Aug 31, 2026 | Award | +117,924 | – | – | 117,924 |
| Kim P. Kamdar Director | Jul 10, 2026 | Award | +22,426 | – | – | 54,999 |
| Kim P. Kamdar Director | Jul 10, 2026 | Award | +3,421 | – | – | 58,420 |
| Mansoor Raza Mirza Director | Jul 10, 2026 | Award | +22,426 | – | – | 80,166 |
| Mansoor Raza Mirza Director | Jul 10, 2026 | Award | +1,771 | – | – | 81,937 |
| Jane F. Barlow Director | Jul 10, 2026 | Award | +22,426 | – | – | 45,139 |
| Jane F. Barlow Director | Jul 10, 2026 | Award | +1,949 | – | – | 47,088 |
| Joshua Phillips Director | Jul 10, 2026 | Award | +2,260 | – | – | 81,691 |
| Joshua Phillips Director | Jul 10, 2026 | Award | +22,426 | – | – | 79,431 |
| Sandra AJ Lawrence Director | Jul 10, 2026 | Award | +22,426 | – | – | 38,899 |
| Sandra AJ Lawrence Director | Jul 10, 2026 | Award | +2,276 | – | – | 41,175 |
| Mark Christopher Capone Director | Jul 10, 2026 | Award | +42,404 | – | – | 42,404 |
| Mark Christopher Capone Director | Jul 10, 2026 | Award | +1,975 | – | – | 44,379 |
| Gregory C. Critchfield Director | Jul 10, 2026 | Award | +1,594 | – | – | 846,886 |
| Gregory C. Critchfield Director | Jul 10, 2026 | Award | +22,426 | – | – | 845,292 |
| Benjamin Jackson General Counsel | Jun 11, 2026 | Sale | −2,179 | $2.01 | $4.38K | 161,756 |
| Zhenya Lindgardt Chief Executive Officer, Director | Jun 11, 2026 | Sale | −6,990 | $2.01 | $14.05K | 865,009 |
| Dyaarl Lee Anderson Jr. Chief Commercial Officer | Jun 11, 2026 | Sale | −4,739 | $2.01 | $9.53K | 77,998 |
| Austin Aerts Chief Financial Officer | Jun 11, 2026 | Sale | −2,037 | $2.01 | $4.09K | 301,190 |
| Tiffany Eul Davis Inglis Chief Medical Officer | Jun 11, 2026 | Sale | −362 | $2.01 | $728 | 92,075 |
| Austin Aerts Chief Financial Officer | Jun 9, 2026 | Sale | −5,440 | $2.08 | $11.32K | 303,227 |
| Zhenya Lindgardt Chief Executive Officer, Director | Jun 9, 2026 | Sale | −20,755 | $2.08 | $43.17K | 871,999 |
| Sandra AJ Lawrence Director | Jun 8, 2026 | Sale(10b5-1 plan) | −1,560 | $2.15 | $3.35K | 16,473 |
| Dyaarl Lee Anderson Jr. Chief Commercial Officer | May 29, 2026 | Award | +3,168 | $1.84 | $5.83K | 82,737 |
| Benjamin Jackson General Counsel | May 29, 2026 | Award | +5,000 | $1.84 | $9.20K | 163,935 |
| Zhenya Lindgardt Chief Executive Officer, Director | Mar 12, 2026 | Award | +154,440 | – | – | 892,754 |
| Austin Aerts Chief Financial Officer | Mar 12, 2026 | Award | +44,215 | – | – | 308,667 |
| Dyaarl Lee Anderson Jr. Chief Commercial Officer | Mar 12, 2026 | Award | +12,455 | – | – | 79,569 |
| Benjamin Jackson General Counsel | Mar 12, 2026 | Award | +44,215 | – | – | 158,935 |
| Tiffany Eul Davis Inglis Chief Medical Officer | Mar 12, 2026 | Award | +17,437 | – | – | 92,437 |
| Zhenya Lindgardt Chief Executive Officer, Director | Mar 11, 2026 | Sale | −2,973 | $2.04 | $6.06K | 738,314 |
| Benjamin Jackson General Counsel | Mar 11, 2026 | Sale | −1,027 | $2.04 | $2.10K | 114,720 |
| John J. Boniface Chief Scientific Officer | Mar 11, 2026 | Sale | −1,517 | $2.04 | $3.09K | 145,842 |
| Paul Kearney Chief Data Officer | Mar 11, 2026 | Sale | −1,396 | $2.04 | $2.85K | 163,961 |
| Robert Gardner Harrison Chief Information Officer | Mar 11, 2026 | Sale | −716 | $2.04 | $1.46K | 76,712 |
| Austin Aerts Chief Financial Officer | Mar 11, 2026 | Sale | −1,019 | $2.04 | $2.08K | 264,452 |
| Zhenya Lindgardt Chief Executive Officer, Director | Mar 10, 2026 | Sale | −22,639 | $1.90 | $43.01K | 741,287 |
| Austin Aerts Chief Financial Officer | Mar 10, 2026 | Sale | −6,069 | $1.90 | $11.53K | 265,471 |
| Austin Aerts Chief Financial Officer | Mar 9, 2026 | Sale | −674 | $1.96 | $1.32K | 271,540 |
| Paul Kearney Chief Data Officer | Mar 9, 2026 | Sale | −2,026 | $1.96 | $3.97K | 165,357 |
| Benjamin Jackson General Counsel | Mar 9, 2026 | Sale | −3,119 | $1.96 | $6.11K | 115,747 |
| John J. Boniface Chief Scientific Officer | Mar 9, 2026 | Sale | −3,038 | $1.96 | $5.95K | 147,359 |
| Robert Gardner Harrison Chief Information Officer | Mar 9, 2026 | Sale | −3,360 | $1.96 | $6.59K | 77,428 |
| Sandra AJ Lawrence Director | Mar 6, 2026 | Sale(10b5-1 plan) | −1,560 | $1.95 | $3.04K | 18,033 |
| Robert Gardner Harrison Chief Information Officer | Feb 24, 2026 | Sale(10b5-1 plan) | −2,000 | $2.34 | $4.68K | 80,788 |
| Kim P. Kamdar Director | Feb 4, 2026 | Other | +3,231 | – | – | 32,573 |
| Kim P. Kamdar Director | Feb 4, 2026 | Other | −30,920 | – | – | 0 |
| Robert Gardner Harrison Chief Information Officer | Jan 27, 2026 | Sale(10b5-1 plan) | −2,000 | $2.97 | $5.94K | 82,788 |
| Robert Gardner Harrison Chief Information Officer | Dec 30, 2025 | Sale(10b5-1 plan) | −2,000 | $3.00 | $6.00K | 84,788 |
| Austin Aerts Chief Financial Officer | Dec 10, 2025 | Sale | −873 | $3.31 | $2.89K | 272,214 |
| Zhenya Lindgardt Chief Executive Officer, Director | Dec 10, 2025 | Sale | −4,155 | $3.31 | $13.75K | 763,926 |
| Robert Gardner Harrison Chief Information Officer | Dec 10, 2025 | Sale | −616 | $3.31 | $2.04K | 86,788 |
| Paul Kearney Chief Data Officer | Dec 10, 2025 | Sale | −1,213 | $3.31 | $4.02K | 167,383 |
| John J. Boniface Chief Scientific Officer | Dec 10, 2025 | Sale | −1,332 | $3.31 | $4.41K | 150,397 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of float
0.80%
0M shares short
Days to cover
9.1
At 0M shares a day
Change since last report
-1.3%
From 0M shares
Short volume, 20 days
38.7%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of Sera Prognostics's stock actually held short. Settlement fails (shares not delivered on time) peaked at 505 shares on Sep 22, 2026 over the last 90 days.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Tiffany Eul Davis Inglis Officer | Oct 13, 2026 | 8,024 | $16.29K | Oct 12, 2026 | Restricted Stock Unit Vesting |
| Tiffany Eul Davis Inglis Officer | Sep 11, 2026 | 486 | $972 | Sep 10, 2026 | Restricted Stock Unit Vesting |
| Dyaarl Lee Anderson Jr. Officer | Sep 11, 2026 | 1,800 | $3.60K | Sep 10, 2026 | Restricted Stock Unit Vesting |
| Austin Aerts Officer | Sep 11, 2026 | 1,509 | $3.02K | Sep 10, 2026 | Restricted Stock Unit Vesting |
| Zhenya Lindgardt Officer, Director | Sep 11, 2026 | 7,022 | $14.05K | Sep 10, 2026 | Restricted Stock Unit Vesting |
| Benjamin Jackson Officer | Sep 11, 2026 | 2,190 | $4.38K | Sep 10, 2026 | Restricted Stock Unit Vesting |
| Austin Aerts Officer | Sep 9, 2026 | 13,591 | $27.20K | Sep 8, 2026 | Restricted Stock Unit Vesting |
| Zhenya Lindgardt Officer, Director | Sep 9, 2026 | 20,139 | $40.29K | Sep 8, 2026 | Restricted Stock Unit Vesting |
| Tiffany Eul Davis Inglis Officer | Jun 15, 2026 | 362 | $726 | Jun 11, 2026 | Restricted Stock Unit Vesting |
| Dyaarl Lee Anderson Jr. Officer | Jun 15, 2026 | 4,739 | $9.50K | Jun 11, 2026 | Restricted Stock Unit Vesting |
| Austin Aerts Officer | Jun 15, 2026 | 2,037 | $4.09K | Jun 11, 2026 | Restricted Stock Unit Vesting |
| Zhenya Lindgardt Officer, Director | Jun 15, 2026 | 6,990 | $14.02K | Jun 11, 2026 | Restricted Stock Unit Vesting |
| Benjamin Jackson Officer | Jun 15, 2026 | 2,179 | $4.37K | Jun 11, 2026 | Restricted Stock Unit Vesting |
| Zhenya Lindgardt Officer, Director | Jun 10, 2026 | 20,755 | $43.20K | Jun 9, 2026 | Restricted Stock Unit Vesting |
| Austin Aerts Officer | Jun 10, 2026 | 5,440 | $11.32K | Jun 9, 2026 | Restricted Stock Unit Vesting |
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