Comparable stake leader
BAKER BROS. ADVISORS LP
SEC ownership of Atreca, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001532346.
Disclosed value leader
BAKER BROS. ADVISORS LP
Comparable rows
0/16
Latest evidence
11 Apr 2024
- Parsed ownership sources
-
3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BAKER BROS. ADVISORS LP
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
11 Apr 2024
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001532346
- Issuer location
- San Carlos, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Atreca, 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
0/16
Latest evidence
11 Apr 2024
3/4/5
Highest disclosed value: $1,195,879
16 rows are not safely comparable across share classes.
Showing 1-8 of 16 holder rows.
Quick read
BAKER BROS. ADVISORS LP has the largest disclosed position value at $1.2M.
0 of 16 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.
Disclosed position value
Top 5
BAKER BROS. ADVISORS LP
$1.2M
Tito Serafini
$136.4K
Herb Cross
$29.3K
John A. Orwin
$29K
Courtney Phillips
$18.9K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 16 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BAKER BROS. ADVISORS LP |
3/4/5
Former 10% Owner
|
—
class O/S missing
|
$1,195,879
2,971,128 shares
|
— | 19 Oct 2023 |
| Tito Serafini |
3/4/5
Director
|
—
class O/S missing
|
$136,380
322,511 shares
|
— | 01 Apr 2024 |
| Herb Cross |
3/4/5
Chief Financial Officer
|
—
class O/S missing
|
$29,309
72,817 shares
|
— | 02 Aug 2023 |
| John A. Orwin |
3/4/5
PRESIDENT & CEO, Director
|
—
mixed-class rows
|
$29,047
77,542 shares
mixed-class rows
|
— | 11 Apr 2024 |
| Courtney Phillips |
3/4/5
GENERAL COUNSEL & SECRETARY
|
—
class O/S missing
|
$18,891
50,431 shares
|
— | 01 Sep 2023 |
| Roger Richard Ruiz |
3/4/5
VP of Finance
|
—
class O/S missing
|
$14,079
34,980 shares
|
— | 17 Sep 2023 |
| Stephen E. Gould |
3/4/5
Chief Scientific Officer
|
—
class O/S missing
|
$11,441
28,424 shares
|
— | 02 Aug 2023 |
| Philippe C. Bishop |
3/4/5
Chief Medical Officer
|
—
class O/S missing
|
—
350,000 shares
|
— | 09 Jan 2023 |
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
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 10 Aug 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-16 of 16 reporting-owner rows connected to Atreca, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
16
Largest Forms 3/4/5 holder
BAKER BROS. ADVISORS LP
Net 12M change
$0
Latest report
11 Apr 2024
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| BAKER BROS. ADVISORS LP | Former 10% Owner | $1,195,879 | Filing P/S | 19 Oct 2023 | ||
| Tito Serafini | Director | $136,380 | Mixed | 01 Apr 2024 | ||
| Herb Cross | Chief Financial Officer | $29,309 | Mixed | 02 Aug 2023 | ||
| John A. Orwin | PRESIDENT & CEO, Director | $29,047 | Mixed | 11 Apr 2024 | ||
| Courtney Phillips | General Counsel & Secretary | $18,891 | Filing P/S | 01 Sep 2023 | ||
| Roger Richard Ruiz | VP of Finance | $14,079 | Mixed | 17 Sep 2023 | ||
| Stephen E. Gould | Chief Scientific Officer | $11,441 | Mixed | 02 Aug 2023 | ||
| Brian G. Atwood | Director | Mixed | 13 Jun 2023 | |||
| Lindsey Rolfe | Director | Mixed | 13 Jun 2023 | |||
| Kristine M. Ball | Director | Mixed | 13 Jun 2023 | |||
| Franklin M. Berger | Director | Mixed | 13 Jun 2023 | |||
| David L. Lacey | Director | Mixed | 13 Jun 2023 | |||
| William Hewitt Robinson | Director | Mixed | 13 Jun 2023 | |||
| Stacey Ma | Director | Mixed | 13 Jun 2023 | |||
| Stephen R. Brady | Director | Mixed | 13 Jun 2023 | |||
| Philippe C. Bishop | Chief Medical Officer | Mixed | 09 Jan 2023 |
Recent insider transactions for Atreca, 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.