DOSSIER · 13F Holders · Q1 2026
OABI

OMNIAB INC

134 institutions still hold OMNIAB INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 68218J103·134 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$80M
visible holders
Holders
134
filers reporting
Concentration
27.90%
Whitefort Capital Management, LP #1
top holder share
AI Holders Summary · Q1 2026

Mid-action, the only trade that moves OmniAb's institutional tape is Woodstock Corp cutting about $12.4k of share flow — a small number in absolute terms that is enormous relative to a $118k total tracked book across just five holders. Zoom out and Woodstock still owns about $72k (roughly 61% of reported institutional value) even after the trim, and the stake's dollar value is up $18k because marks more than offset the share reduction. Thrive Wealth Management is the largest buyer by flow (~$1.9k) and second holder at $44k. Farther Finance, Gamma Investing, and True Wealth Design round out a holder list measured in hundreds of dollars. This is not a crowded smart-money debate — it is a micro residual float with one advisor setting almost all the risk.

Mid-action, OmniAb's (OABI) institutional quarter collapses to one decision: Woodstock Corp sold about $12.4k of share flow in the period ending 2026-06-30. In a normal large-cap that would be noise. Here it is the market.

Zoom out to a five-name book

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Whitefort Capital Management, LP
CIK 0001884931
$22M14.2M6.59%Q1 2026
02
BlackRock, Inc.
CIK 0002012383
$13M8.1M0.00%Q1 2026
03
CADIAN CAPITAL MANAGEMENT, LP
CIK 0001423686
$7M4.2M0.79%Q1 2026
04
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$6M4.0M0.00%Q1 2026
05
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$5M2.9M0.00%Q1 2026
06
RICE HALL JAMES & ASSOCIATES, LLC
CIK 0001230765
$4M2.5M0.22%Q1 2026
07
PRIVATE MANAGEMENT GROUP INC
CIK 0001142031
$4M2.4M0.11%Q1 2026
08
STATE STREET CORP
CIK 0000093751
$3M2.1M0.00%Q1 2026
09
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$3M1.7M0.00%Q1 2026
10
ISTHMUS PARTNERS, LLC
CIK 0001639666
$2M803K0.19%Q2 2026
11
TOWERVIEW LLC
CIK 0001166573
$2M1.0M1.01%Q1 2026
12
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$2M960K0.00%Q1 2026
13
Vanguard Portfolio Management
CIK 0002100121· Index
$1M904K0.00%Q1 2026
14
NORTHERN TRUST CORP
CIK 0000073124· Index
$1M881K0.00%Q1 2026
15
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$1M726K0.00%Q1 2026
16
ADAR1 Capital Management, LLC
CIK 0001940272
$1M705K0.07%Q1 2026
17
NOMURA HOLDINGS INC
CIK 0001163653
$1M705K0.00%Q1 2026
18
Nuveen, LLC
CIK 0001871926
$979K624K0.00%Q1 2026
19
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$805K513K0.00%Q1 2026
20
Kent Lake PR LLC
CIK 0002037231
$800K500K0.40%Q3 2025
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Insiders at OMNIAB INC
Gotwals Philip JCrouse Steven C.Cochran Jennifer R.Bertozzi Carolyn RBerkman Charles SGustafson Kurt AFoehr Matthew WHiggins John L