Comparable stake leader
Ash X LP
SEC ownership of OmniAb, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001846253.
Disclosed value leader
Whitefort Capital Management, LP
Comparable rows
50/50
Latest evidence
30 Jun 2026
- Public ticker
- OABIW, OABI on Nasdaq
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Ash X LP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Ash X LP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001846253
- Issuer location
- Emeryville, CA
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 OmniAb, 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
Ash X LP
Disclosed value leader
Whitefort Capital Managem...
Comparable rows
50/50
Latest evidence
30 Jun 2026
13D/G
13F
Lead comparable stake: 8.5%
13D/G row: Ash X LP
Showing 1-8 of 50 holder rows.
Quick read
Ash X LP leads the comparable SEC ownership view at 8.5%.
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 Ash X LP's linked filing trail.
Comparable ownership
Top 5
Ash X LP
8.5%
Whitefort Capital Management, LP
7.1%
Janus Henderson Group Ltd.
0.8%
BlackRock, Inc.
6.2%
NOMURA HOLDINGS INC
3.5%
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 |
|---|---|---|---|---|---|
| Ash X LP |
13D/G
Robert Goldstein
|
8.5%
|
$22,740,148
12,291,972 shares
|
+$4,107,701 | 31 Dec 2025 |
| Whitefort Capital Management, LP |
13F
13D/G
Company
|
7.1%
from 13D/G
|
$25,211,699
10,248,658 shares
|
— | 30 Jun 2026 |
| Janus Henderson Group Ltd. |
13D/G
JANUS HENDERSON GROUP PLC
|
0.8%
|
$2,086,555
948,434 shares
|
-$15,655,944 | 30 Jun 2025 |
| BlackRock, Inc. |
13F
Company
|
6.2%
|
$21,887,827
8,897,490 shares
|
— | 30 Jun 2026 |
| NOMURA HOLDINGS INC |
13F
Company
|
3.5%
|
$12,369,274
5,028,160 shares
|
— | 30 Jun 2026 |
| CADIAN CAPITAL MANAGEMENT, LP |
13F
Company
|
2.9%
|
$10,361,080
4,211,821 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
2.7%
|
$9,476,796
3,852,356 shares
|
— | 30 Jun 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
2%
|
$7,096,381
2,883,978 shares
|
— | 30 Jun 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: -$175,329.
Buys
$107,707
Insiders: 1
Sells
$283,036
Insiders: 3
Net
-$175,329
Shares: -86,074
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 77,261
Shares: 163,335
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 33,314 | $0 | $49,638 | -$49,638 |
| 6-9 | 0 | 84,389 | $0 | $143,959 | -$143,959 |
| 9-12 | 77,261 | 45,632 | $107,707 | $89,439 | +$18,268 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 25 reporting-owner rows connected to OmniAb, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
25
Largest Forms 3/4/5 holder
Avista Acquisition GP LLC II
Net 12M change
-$175,329
Latest report
01 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Avista Acquisition GP LLC II | Director, 10%+ Owner | $85,344,500 | Mixed | 09 Dec 2022 | ||
| Avista Capital Managing Member V, LLC | 10%+ Owner | $59,485,556 | Mixed | 28 Jun 2024 | ||
| Matthew W. Foehr | President and CEO, Director | $6,586,533 | -$143,482 | -2.1% | Filing P/S | 07 Apr 2026 |
| John L. Higgins | Director | $4,650,842 | +$107,707 | +2.4% | Mixed | 17 Jun 2026 |
| BARCLAYS PLC | Not a 10% owner | $1,343,440 | Mixed | 04 Nov 2022 | ||
| Charles S. Berkman | Chief Legal Officer | $594,636 | -$54,854 | -8.4% | Filing P/S | 07 Apr 2026 |
| Kurt A. Gustafson | Executive VP, Finance and CFO | $389,609 | -$84,700 | -18% | Filing P/S | 07 Apr 2026 |
| Sarah Boyce | Director | $301,970 | Mixed | 18 Jun 2024 | ||
| Jennifer R. Cochran | Director | $290,880 | Mixed | 17 Jun 2026 | ||
| Carolyn R. Bertozzi | Director | $177,893 | Mixed | 17 Jun 2026 | ||
| Steven Love | Director | $143,915 | Mixed | 17 Jun 2026 | ||
| Philip J. Gotwals | Director | $52,332 | Mixed | 17 Jun 2026 | ||
| Steven C. Crouse | Director | $52,332 | Mixed | 17 Jun 2026 | ||
| Benjamin Silbert | General Counsel | Mixed | 09 Aug 2021 | |||
| Sriram Venkataraman | Executive Vice President | Mixed | 09 Aug 2021 | |||
| Charles C. Harwood Jr. | Director | Mixed | 24 Aug 2022 | |||
| John Cafasso | Chief Financial Officer | Mixed | 09 Aug 2021 | |||
| Robert Girardi | Executive Vice President | Mixed | 09 Aug 2021 | |||
| Amanda N. Heravi | Investor Relations Officer | Mixed | 09 Aug 2021 | |||
| Lale White | Director | Mixed | 09 Aug 2021 |
Recent insider transactions for OmniAb, 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Amechi Ekeke Nwachuku | OABI | Stock Option (right to buy) | Award | 800,000 | 800,000 | 01 Aug 2026 | Direct | |||
| Carolyn R. Bertozzi | OABI | Common Stock | Options Exercise | 21.4% | 20,000 | 113,308 | 17 Jun 2026 | Direct | ||
| Carolyn R. Bertozzi | OABI | Stock Option (right to buy) | Award | 40,000 | 40,000 | 17 Jun 2026 | Direct | |||
| Carolyn R. Bertozzi | OABI | Restricted Stock Units | Award | 20,000 | 20,000 | 17 Jun 2026 | Direct | |||
| Carolyn R. Bertozzi | OABI | Restricted Stock Units | Options Exercise | -100% | -20,000 | 0 | 17 Jun 2026 | Direct | ||
| Jennifer R. Cochran | OABI | Common Stock | Options Exercise | 12.1% | 20,000 | 185,274 | 17 Jun 2026 | Direct | ||
| Jennifer R. Cochran | OABI | Stock Option (right to buy) | Award | 40,000 | 40,000 | 17 Jun 2026 | Direct | |||
| Jennifer R. Cochran | OABI | Restricted Stock Units | Award | 20,000 | 20,000 | 17 Jun 2026 | Direct | |||
| Jennifer R. Cochran | OABI | Restricted Stock Units | Options Exercise | -100% | -20,000 | 0 | 17 Jun 2026 | Direct | ||
| Steven C. Crouse | OABI | Common Stock | Options Exercise | 150% | 20,000 | 33,333 | 17 Jun 2026 | Direct | ||
| Steven C. Crouse | OABI | Stock Option (right to buy) | Award | 40,000 | 40,000 | 17 Jun 2026 | Direct | |||
| Steven C. Crouse | OABI | Restricted Stock Units | Award | 75% | 20,000 | 46,667 | 17 Jun 2026 | Direct | ||
| Steven C. Crouse | OABI | Restricted Stock Units | Options Exercise | -42.9% | -20,000 | 26,667 | 17 Jun 2026 | Direct | ||
| Philip J. Gotwals | OABI | Common Stock | Options Exercise | 150% | 20,000 | 33,333 | 17 Jun 2026 | Direct | ||
| Philip J. Gotwals | OABI | Stock Option (right to buy) | Award | 40,000 | 40,000 | 17 Jun 2026 | Direct | |||
| Philip J. Gotwals | OABI | Restricted Stock Units | Award | 75% | 20,000 | 46,667 | 17 Jun 2026 | Direct | ||
| Philip J. Gotwals | OABI | Restricted Stock Units | Options Exercise | -42.9% | -20,000 | 26,667 | 17 Jun 2026 | Direct | ||
| John L. Higgins | OABI | Common Stock | Options Exercise | 0.68% | 20,000 | 2,962,320 | 17 Jun 2026 | Direct | ||
| John L. Higgins | OABI | Stock Option (right to buy) | Award | 40,000 | 40,000 | 17 Jun 2026 | Direct | |||
| John L. Higgins | OABI | Restricted Stock Units | Award | 20,000 | 20,000 | 17 Jun 2026 | Direct | |||
| John L. Higgins | OABI | Restricted Stock Units | Options Exercise | -100% | -20,000 | 0 | 17 Jun 2026 | Direct | ||
| Steven Love | OABI | Common Stock | Options Exercise | 27.9% | 20,000 | 91,666 | 17 Jun 2026 | Direct | ||
| Steven Love | OABI | Stock Option (right to buy) | Award | 40,000 | 40,000 | 17 Jun 2026 | Direct | |||
| Steven Love | OABI | Restricted Stock Units | Award | 150% | 20,000 | 33,334 | 17 Jun 2026 | Direct | ||
| Steven Love | OABI | Restricted Stock Units | Options Exercise | -60% | -20,000 | 13,334 | 17 Jun 2026 | Direct | ||
| Philip J. Gotwals | OABI | Common Stock | Options Exercise | 13,333 | 13,333 | 21 Apr 2026 | Direct | |||
| Philip J. Gotwals | OABI | Restricted Stock Units | Options Exercise | -22.2% | -13,333 | 46,667 | 21 Apr 2026 | Direct | ||
| Steven C. Crouse | OABI | Common Stock | Options Exercise | 13,333 | 13,333 | 21 Apr 2026 | Direct | |||
| Steven C. Crouse | OABI | Restricted Stock Units | Options Exercise | -22.2% | -13,333 | 46,667 | 21 Apr 2026 | Direct | ||
| Matthew W. Foehr | OABI | Common Stock | Sale | -0.43% | $28,674 | $1.49 | -19,244 | 4,420,492 | 07 Apr 2026 | Direct |
| Matthew W. Foehr | OABI | Common Stock | Options Exercise | 0.83% | 36,459 | 4,439,736 | 07 Apr 2026 | Direct | ||
| Matthew W. Foehr | OABI | Restricted Stock Units | Options Exercise | -10.5% | -36,459 | 309,376 | 07 Apr 2026 | Direct | ||
| Kurt A. Gustafson | OABI | Common Stock | Sale | -2.58% | $10,300 | $1.49 | -6,913 | 261,483 | 07 Apr 2026 | Direct |
| Kurt A. Gustafson | OABI | Common Stock | Options Exercise | 5.31% | 13,542 | 268,396 | 07 Apr 2026 | Direct | ||
| Kurt A. Gustafson | OABI | Restricted Stock Units | Options Exercise | -10.9% | -13,542 | 111,042 | 07 Apr 2026 | Direct | ||
| Charles S. Berkman | OABI | Common Stock | Sale | -1.76% | $10,664 | $1.49 | -7,157 | 399,085 | 07 Apr 2026 | Direct |
| Charles S. Berkman | OABI | Common Stock | Options Exercise | 3.45% | 13,542 | 406,242 | 07 Apr 2026 | Direct | ||
| Charles S. Berkman | OABI | Restricted Stock Units | Options Exercise | -10.9% | -13,542 | 111,042 | 07 Apr 2026 | Direct | ||
| Charles S. Berkman | OABI | Common Stock | Sale | -2.4% | $16,541 | $1.71 | -9,673 | 392,700 | 18 Feb 2026 | Direct |
| Charles S. Berkman | OABI | Common Stock | Options Exercise | 4.89% | 18,750 | 402,373 | 18 Feb 2026 | Direct | ||
| Charles S. Berkman | OABI | Stock Option | Award | 600,000 | 600,000 | 18 Feb 2026 | Direct | |||
| Charles S. Berkman | OABI | Restricted Stock Units | Award | 92.9% | 60,000 | 124,584 | 18 Feb 2026 | Direct | ||
| Charles S. Berkman | OABI | Restricted Stock Units | Options Exercise | -22.5% | -18,750 | 64,584 | 18 Feb 2026 | Direct | ||
| Kurt A. Gustafson | OABI | Common Stock | Sale | -3.34% | $15,905 | $1.71 | -9,301 | 268,851 | 18 Feb 2026 | Direct |
| Kurt A. Gustafson | OABI | Common Stock | Options Exercise | 7.23% | 18,750 | 278,152 | 18 Feb 2026 | Direct | ||
| Kurt A. Gustafson | OABI | Stock Option | Award | 600,000 | 600,000 | 18 Feb 2026 | Direct | |||
| Kurt A. Gustafson | OABI | Restricted Stock Units | Award | 92.9% | 60,000 | 124,584 | 18 Feb 2026 | Direct | ||
| Kurt A. Gustafson | OABI | Restricted Stock Units | Options Exercise | -22.5% | -18,750 | 64,584 | 18 Feb 2026 | Direct | ||
| Matthew W. Foehr | OABI | Common Stock | Sale | -0.7% | $52,742 | $1.71 | -30,843 | 4,403,277 | 18 Feb 2026 | Direct |
| Matthew W. Foehr | OABI | Common Stock | Options Exercise | 1.33% | 58,333 | 4,434,120 | 18 Feb 2026 | Direct |
* marks a reported price that did not pass the local price check.