Latest Period
Q1 2026
Security Snapshot
OmniAb, Inc. - Common Stock, par value $0.0001 per share (OABI) Institutional Ownership
CUSIP: 68218J103
13F Institutional Holders and Ownership History from Q3 2022 to Q2 2026
Institutions Reporting
127
Shares (Excl. Options)
55,950,117
Price
$1.57
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- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Symbol
- OABI on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 55,950,117
- Total 13F value
- $87,691,678
- Portfolio coverage rank
- 0%
- Share change
- -1,393,347
- Value change
- -$2,354,051
- Number of holders
- 127
- Shares outstanding
- 144,611,435
- SEC-reported price per share
- $2.46
- Insider filing price
- $2.46
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- OABI - OmniAb, Inc. - Common Stock, par value $0.0001 per share is tracked under CUSIP 68218J103.
- 127 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 127 to 2 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $87,691,678 to $44,708.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 127 institutions filings for Q1 2026.
Security key
68218J103
Latest holder period
Q1 2026
13F holders
127
13D/G owners
3
CIK / CUSIP context first
Open Q1 2026 holders
OABI full holder history
OmniAb, Inc. SEC filings
OmniAb, Inc. company facts
OmniAb, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 68218J103:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
OABI
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Whitefort Capital Management, LP | 9.9% | +19% | $22,757,853 | +$6,373,619 | 14,223,658 | +39% | Whitefort Capital Management, LP | 30 Sep 2025 |
| Ash X LP | 8.5% | +21% | $22,740,148 | +$4,107,701 | 12,291,972 | +22% | Robert Goldstein | 31 Dec 2025 |
| JANUS HENDERSON GROUP PLC | 0.8% | -83% | $2,086,555 | -$15,655,944 | 948,434 | -88% | JANUS HENDERSON GROUP PLC | 30 Jun 2025 |
As of 31 Mar 2026, 127 institutional investors reported holding 55,950,117 shares of OmniAb, Inc. - Common Stock, par value $0.0001 per share (OABI). This represents 39% of the company’s total 144,611,435 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
36%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Whitefort Capital Management, LP | 9.8% | 14,223,658 | 0% | 6.8% | $22,331,143 |
| BlackRock, Inc. | 5.6% | 8,106,881 | +0.52% | 0% | $12,727,803 |
| CADIAN CAPITAL MANAGEMENT, LP | 2.9% | 4,157,129 | -6.3% | 0.79% | $6,526,693 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.8% | 3,993,652 | 0% | 0% | $6,270,034 |
| GEODE CAPITAL MANAGEMENT, LLC | 2% | 2,925,579 | +7.5% | 0% | $4,594,230 |
| RICE HALL JAMES & ASSOCIATES, LLC | 1.8% | 2,547,255 | +6.1% | 0.22% | $3,999,190 |
| PRIVATE MANAGEMENT GROUP INC | 1.7% | 2,429,166 | +0.36% | 0.11% | $3,813,791 |
| STATE STREET CORP | 1.4% | 2,067,143 | +0.89% | 0% | $3,245,415 |
| DIMENSIONAL FUND ADVISORS LP | 1.2% | 1,745,248 | -19% | 0% | $2,739,965 |
| TOWERVIEW LLC | 0.69% | 1,000,000 | 0% | 1% | $1,570,000 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.66% | 959,573 | -0.67% | 0% | $1,506,530 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.62% | 903,799 | 0% | 0% | $1,418,964 |
| NORTHERN TRUST CORP | 0.61% | 880,895 | +6.3% | 0% | $1,383,005 |
| ISTHMUS PARTNERS, LLC | 0.52% | 756,674 | +4.9% | 0.12% | $1,187,978 |
| VANGUARD FIDUCIARY TRUST CO | 0.5% | 725,608 | 0% | 0% | $1,139,205 |
| ADAR1 Capital Management, LLC | 0.49% | 705,190 | +0.43% | 0.07% | $1,107,148 |
| NOMURA HOLDINGS INC | 0.49% | 705,048 | +355% | 0.01% | $1,106,925 |
| Nuveen, LLC | 0.43% | 623,876 | -29% | 0% | $979,485 |
| MILLENNIUM MANAGEMENT LLC | 0.36% | 523,918 | -22% | 0% | $629,731 |
| TWO SIGMA INVESTMENTS, LP | 0.35% | 512,741 | +21% | 0% | $805,003 |
| GOLDMAN SACHS GROUP INC | 0.29% | 419,024 | -22% | 0% | $657,867 |
| MORGAN STANLEY | 0.28% | 407,933 | +4.7% | 0% | $640,454 |
| D. E. Shaw & Co., Inc. | 0.26% | 380,254 | -0.76% | 0% | $596,999 |
| Bank of New York Mellon Corp | 0.19% | 274,451 | +2.2% | 0% | $430,888 |
| RENAISSANCE TECHNOLOGIES LLC | 0.19% | 269,600 | +11% | 0% | $423,272 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
16
Latest
Q1 2026
Rows shown
1-16 of 16
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 18,174 | $44,708 | -$97 | $2.46 | 2 |
| 2026 Q1 | 55,950,117 | $87,691,678 | -$2,354,051 | $1.57 | 127 |
| 2025 Q4 | 57,293,183 | $105,777,712 | -$9,466,573 | $1.85 | 129 |
| 2025 Q3 | 62,966,561 | $100,537,605 | +$12,809,155 | $1.60 | 139 |
| 2025 Q2 | 55,028,248 | $95,538,152 | -$30,177,530 | $1.74 | 142 |
| 2025 Q1 | 63,239,232 | $151,919,353 | -$2,099,490 | $2.40 | 148 |
| 2024 Q4 | 63,382,072 | $224,374,988 | -$2,204,897 | $3.54 | 161 |
| 2024 Q3 | 79,658,040 | $334,361,661 | +$4,940,077 | $4.23 | 160 |
| 2024 Q2 | 79,082,289 | $293,789,491 | -$22,676,741 | $3.75 | 154 |
| 2024 Q1 | 83,603,596 | $450,161,135 | -$1,041,679 | $5.42 | 151 |
| 2023 Q4 | 83,756,153 | $513,879,428 | -$6,358,794 | $6.17 | 155 |
| 2023 Q3 | 68,671,481 | $355,812,525 | +$6,545,772 | $5.19 | 146 |
| 2023 Q2 | 67,366,149 | $338,275,965 | +$9,139,522 | $5.03 | 139 |
| 2023 Q1 | 66,221,011 | $243,264,177 | +$5,201,932 | $3.68 | 138 |
| 2022 Q4 | 65,164,685 | $234,990,736 | +$222,348,609 | $3.60 | 145 |
| 2022 Q3 | 1,101,548 | $11,247,000 | +$11,247,000 | $10.21 | 1 |