Comparable stake leader
BAKER BROS. ADVISORS LP
SEC ownership of SERA PROGNOSTICS, INC.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001534969.
Disclosed value leader
BAKER BROS. ADVISORS LP
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- SERA on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BAKER BROS. ADVISORS LP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BAKER BROS. ADVISORS LP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001534969
- Issuer location
- Salt Lake City, UT
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of SERA PROGNOSTICS, INC. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BAKER BROS. ADVISORS LP
Disclosed value leader
BAKER BROS. ADVISORS LP
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
3/4/5
13F
Lead comparable stake: 16%
13D/G row: BAKER BROS. ADVISORS LP
Showing 1-8 of 50 holder rows.
Quick read
BAKER BROS. ADVISORS LP leads the comparable SEC ownership view at 16%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BAKER BROS. ADVISORS LP's linked filing trail.
Comparable ownership
Top 5
BAKER BROS. ADVISORS LP
16%
Whetstone Capital Advisors, LLC
8.6%
Chione Ltd
7.6%
Aberdeen Group plc
6.1%
Vivo Capital IX, LLC
4.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BAKER BROS. ADVISORS LP |
13D/G
3/4/5
13F
10%+ Owner · Company
|
16%
|
$18,418,870
5,498,170 shares
|
$0 | 12 Feb 2025 |
| Whetstone Capital Advisors, LLC |
13D/G
13F
Company
|
8.6%
|
$7,341,294
3,306,889 shares
|
-$339,269 | 31 Mar 2026 |
| Chione Ltd |
13D/G
|
7.6%
|
$8,727,926
2,605,351 shares
|
$0 | 11 Feb 2025 |
| Aberdeen Group plc |
13D/G
13F
Company
|
6.1%
|
$6,325,722
2,227,367 shares
|
$0 | 30 Jun 2025 |
| Vivo Capital IX, LLC |
13D/G
|
4.5%
|
$5,528,974
1,650,440 shares
|
$0 | 31 Mar 2025 |
| Paul Kearney |
3/4/5
Chief Data Officer
|
0.43%
|
$334,480
163,961 shares
|
-$193,279 | 12 Mar 2026 |
| John J. Boniface |
3/4/5
Chief Scientific Officer
|
0.38%
|
$297,517
145,842 shares
|
-$56,193 | 12 Mar 2026 |
| Robert Gardner Harrison |
3/4/5
Chief Information Officer
|
0.2%
|
$156,492
76,712 shares
|
-$98,751 | 12 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$866,590.
Buys
$0
Insiders: 0
Sells
$866,590
Insiders: 10
Net
-$866,590
Shares: -329,986
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 329,986
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 44,062 | $0 | $90,617 | -$90,617 |
| 3-6 | 0 | 57,133 | $0 | $115,794 | -$115,794 |
| 6-9 | 0 | 131,389 | $0 | $380,277 | -$380,277 |
| 9-12 | 0 | 97,402 | $0 | $279,902 | -$279,902 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 26 reporting-owner rows connected to SERA PROGNOSTICS, INC.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
26
Largest Forms 3/4/5 holder
Gregory C. Critchfield
Net 12M change
-$866,589
Latest report
11 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Gregory C. Critchfield | Director | $1,826,762 | Mixed | 05 Jun 2025 | ||
| Zhenya Lindgardt | Chief Executive Officer, Director | $1,738,668 | -$334,780 | -16% | Filing P/S | 11 Jun 2026 |
| Blue Ox Healthcare Partners, LLC | 10%+ Owner | $1,339,791 | Mixed | 18 Jul 2022 | ||
| Douglas Carl Fisher | Chief Business Officer | $1,151,334 | Mixed | 10 Jan 2022 | ||
| Austin Aerts | Chief Financial Officer | $605,391 | -$99,949 | -14% | Filing P/S | 11 Jun 2026 |
| Paul Kearney | Chief Data Officer | $334,480 | -$193,279 | -37% | Filing P/S | 12 Mar 2026 |
| Benjamin G. Jackson | General Counsel | $325,129 | -$53,334 | -14% | Filing P/S | 11 Jun 2026 |
| John J. Boniface | Chief Scientific Officer | $297,517 | -$56,193 | -16% | Filing P/S | 12 Mar 2026 |
| Jay M. Moyes | Chief Financial Officer | $185,989 | Mixed | 07 Jun 2023 | ||
| Tiffany Eul Davis Inglis | Chief Medical Officer | $185,070 | -$728 | -0.39% | Filing P/S | 11 Jun 2026 |
| Mansoor Raza Mirza | Director | $176,107 | -$4,138 | -2.3% | Filing P/S | 05 Dec 2025 |
| Dyaarl Lee Anderson Jr. | Chief Commercial Officer | $156,775 | -$9,525 | -5.7% | Filing P/S | 11 Jun 2026 |
| Robert Gardner Harrison | Chief Information Officer | $156,492 | -$98,751 | -39% | Filing P/S | 12 Mar 2026 |
| Michael R. Foley | Chief Medical Officer | $140,940 | Mixed | 12 Jul 2023 | ||
| Jeffrey Thomas Elliott | Director | $127,021 | Mixed | 04 Jun 2026 | ||
| Joshua Phillips | Director | $126,551 | Mixed | 05 Jun 2025 | ||
| Kim P. Kamdar | Director | $96,096 | Mixed | 04 Feb 2026 | ||
| Nadia Altomare | Chief Commercial Officer | $95,526 | Mixed | 09 Jun 2023 | ||
| Marcus Dean Wilson | Director | $57,719 | Mixed | 05 Jun 2025 | ||
| Jane F. Barlow | Director | $50,422 | Mixed | 05 Jun 2025 |
Recent insider transactions for SERA PROGNOSTICS, INC.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Dyaarl Lee Anderson Jr. | SERA | Class A Common Stock | Sale | -5.73% | $9,525 | $2.01 | -4,739 | 77,998 | 11 Jun 2026 | Direct |
| Austin Aerts | SERA | Class A Common Stock | Sale | -0.67% | $4,094 | $2.01 | -2,037 | 301,190 | 11 Jun 2026 | Direct |
| Zhenya Lindgardt | SERA | Class A Common Stock | Sale | -0.8% | $14,050 | $2.01 | -6,990 | 865,009 | 11 Jun 2026 | Direct |
| Tiffany Eul Davis Inglis | SERA | Class A Common Stock | Sale | -0.39% | $728 | $2.01 | -362 | 92,075 | 11 Jun 2026 | Direct |
| Benjamin G. Jackson | SERA | Class A Common Stock | Sale | -1.33% | $4,380 | $2.01 | -2,179 | 161,756 | 11 Jun 2026 | Direct |
| Zhenya Lindgardt | SERA | Class A Common Stock | Sale | -2.32% | $43,170 | $2.08 | -20,755 | 871,999 | 09 Jun 2026 | Direct |
| Austin Aerts | SERA | Class A Common Stock | Sale | -1.76% | $11,315 | $2.08 | -5,440 | 303,227 | 09 Jun 2026 | Direct |
| Sandra Aj Lawrence | SERA | Class A Common Stock | Sale | -8.65% | $3,354 | $2.15 | -1,560 | 16,473 | 08 Jun 2026 | Direct |
| Benjamin G. Jackson | SERA | Class A Common Stock | Award | 3.15% | 5,000 | 163,935 | 29 May 2026 | Direct | ||
| Dyaarl Lee Anderson Jr. | SERA | Class A Common Stock | Award | 3.98% | 3,168 | 82,737 | 29 May 2026 | Direct | ||
| Zhenya Lindgardt | SERA | Class A Common Stock | Award | 20.9% | 154,440 | 892,754 | 12 Mar 2026 | Direct | ||
| Zhenya Lindgardt | SERA | Stock Option (right to buy) | Award | 239,442 | 239,442 | 12 Mar 2026 | Direct | |||
| Benjamin G. Jackson | SERA | Class A Common Stock | Award | 38.5% | 44,215 | 158,935 | 12 Mar 2026 | Direct | ||
| Benjamin G. Jackson | SERA | Stock Option (right to buy) | Award | 68,550 | 68,550 | 12 Mar 2026 | Direct | |||
| Tiffany Eul Davis Inglis | SERA | Class A Common Stock | Award | 23.2% | 17,437 | 92,437 | 12 Mar 2026 | Direct | ||
| Tiffany Eul Davis Inglis | SERA | Stock Option (right to buy) | Award | 27,034 | 27,034 | 12 Mar 2026 | Direct | |||
| Dyaarl Lee Anderson Jr. | SERA | Class A Common Stock | Award | 18.6% | 12,455 | 79,569 | 12 Mar 2026 | Direct | ||
| Dyaarl Lee Anderson Jr. | SERA | Stock Option (right to buy) | Award | 19,310 | 19,310 | 12 Mar 2026 | Direct | |||
| Austin Aerts | SERA | Class A Common Stock | Award | 16.7% | 44,215 | 308,667 | 12 Mar 2026 | Direct | ||
| Austin Aerts | SERA | Stock Option (right to buy) | Award | 68,550 | 68,550 | 12 Mar 2026 | Direct | |||
| Zhenya Lindgardt | SERA | Class A Common Stock | Sale | -0.4% | $6,065 | $2.04 | -2,973 | 738,314 | 11 Mar 2026 | Direct |
| Paul Kearney | SERA | Class A Common Stock | Sale | -0.84% | $2,848 | $2.04 | -1,396 | 163,961 | 11 Mar 2026 | Direct |
| Benjamin G. Jackson | SERA | Class A Common Stock | Sale | -0.89% | $2,095 | $2.04 | -1,027 | 114,720 | 11 Mar 2026 | Direct |
| Robert Gardner Harrison | SERA | Class A Common Stock | Sale | -0.92% | $1,461 | $2.04 | -716 | 76,712 | 11 Mar 2026 | Direct |
| John J. Boniface | SERA | Class A Common Stock | Sale | -1.03% | $3,095 | $2.04 | -1,517 | 145,842 | 11 Mar 2026 | Direct |
| Austin Aerts | SERA | Class A Common Stock | Sale | -0.38% | $2,079 | $2.04 | -1,019 | 264,452 | 11 Mar 2026 | Direct |
| Zhenya Lindgardt | SERA | Class A Common Stock | Sale | -2.96% | $43,014 | $1.90 | -22,639 | 741,287 | 10 Mar 2026 | Direct |
| Austin Aerts | SERA | Class A Common Stock | Sale | -2.24% | $11,531 | $1.90 | -6,069 | 265,471 | 10 Mar 2026 | Direct |
| Paul Kearney | SERA | Class A Common Stock | Sale | -1.21% | $3,971 | $1.96 | -2,026 | 165,357 | 09 Mar 2026 | Direct |
| Benjamin G. Jackson | SERA | Class A Common Stock | Sale | -2.62% | $6,113 | $1.96 | -3,119 | 115,747 | 09 Mar 2026 | Direct |
| Robert Gardner Harrison | SERA | Class A Common Stock | Sale | -4.16% | $6,586 | $1.96 | -3,360 | 77,428 | 09 Mar 2026 | Direct |
| John J. Boniface | SERA | Class A Common Stock | Sale | -2.02% | $5,954 | $1.96 | -3,038 | 147,359 | 09 Mar 2026 | Direct |
| Austin Aerts | SERA | Class A Common Stock | Sale | -0.25% | $1,321 | $1.96 | -674 | 271,540 | 09 Mar 2026 | Direct |
| Sandra Aj Lawrence | SERA | Class A Common Stock | Sale | -7.96% | $3,042 | $1.95 | -1,560 | 18,033 | 06 Mar 2026 | Direct |
| Robert Gardner Harrison | SERA | Class A Common Stock | Sale | -2.42% | $4,680 | $2.34 | -2,000 | 80,788 | 24 Feb 2026 | Direct |
| Kim P. Kamdar | SERA | Class A Common Stock | Other | 11% | 3,231 | 32,573 | 04 Feb 2026 | Direct | ||
| Kim P. Kamdar | SERA | Class A Common Stock | Other | -100% | -30,920 | 0 | 04 Feb 2026 | Held by Domain Associates, LLC | ||
| Robert Gardner Harrison | SERA | Class A Common Stock | Sale | -2.36% | $5,940 | $2.97 | -2,000 | 82,788 | 27 Jan 2026 | Direct |
| Robert Gardner Harrison | SERA | Class A Common Stock | Sale | -2.3% | $6,000 | $3.00 | -2,000 | 84,788 | 30 Dec 2025 | Direct |
| Zhenya Lindgardt | SERA | Class A Common Stock | Sale | -0.54% | $13,753 | $3.31 | -4,155 | 763,926 | 10 Dec 2025 | Direct |
| Paul Kearney | SERA | Class A Common Stock | Sale | -0.72% | $4,015 | $3.31 | -1,213 | 167,383 | 10 Dec 2025 | Direct |
| Benjamin G. Jackson | SERA | Class A Common Stock | Sale | -0.74% | $2,953 | $3.31 | -892 | 118,866 | 10 Dec 2025 | Direct |
| Robert Gardner Harrison | SERA | Class A Common Stock | Sale | -0.7% | $2,039 | $3.31 | -616 | 86,788 | 10 Dec 2025 | Direct |
| John J. Boniface | SERA | Class A Common Stock | Sale | -0.88% | $4,409 | $3.31 | -1,332 | 150,397 | 10 Dec 2025 | Direct |
| Austin Aerts | SERA | Class A Common Stock | Sale | -0.32% | $2,890 | $3.31 | -873 | 272,214 | 10 Dec 2025 | Direct |
| Zhenya Lindgardt | SERA | Class A Common Stock | Sale | -3.54% | $85,774 | $3.04 | -28,215 | 768,081 | 09 Dec 2025 | Direct |
| Austin Aerts | SERA | Class A Common Stock | Sale | -1.88% | $15,905 | $3.04 | -5,232 | 273,087 | 09 Dec 2025 | Direct |
| Sandra Aj Lawrence | SERA | Class A Common Stock | Sale | -7.37% | $4,758 | $3.05 | -1,560 | 19,593 | 08 Dec 2025 | Direct |
| Mansoor Raza Mirza | SERA | Class A Common Stock | Sale | -0.5% | $891 | $3.05 | -292 | 57,740 | 05 Dec 2025 | Direct |
| Robert Gardner Harrison | SERA | Class A Common Stock | Sale | -2.24% | $5,860 | $2.93 | -2,000 | 87,404 | 02 Dec 2025 | Direct |
* marks a reported price that did not pass the local price check.