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Livermore
Livermore
ZHEN

OmniAb, Inc.

OABI
Exchange
Nasdaq
Industry
Services-Commercial Physical & Biological Research
SEC CIK
0001846253

No open-market purchases or sales by OmniAb, Inc. insiders were filed in the last 90 days; 131 institutions reported holding it in 13F filings for Q2 2026, worth $144.2M in total; no superinvestor holds it.

Other share classesOABIW

Holders of 5% or more of OABI

Holders whose latest Schedule 13D or 13G filing reports 5% or more of OmniAb, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of OABI
HolderLatest formStakeChangeFirst filedLatest filingFiling
Ash X LP13G/A8.50%12.3M shares+1.50 ppfrom 7.00%Jul 1, 20253 filingsFeb 10, 2026SEC
Whitefort Capital Management, LP13G/A7.10%10.2M shares−2.80 ppfrom 9.90%Jun 6, 20254 filingsAug 14, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

30 Schedule 13D and 13G filings on OmniAb, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on OABI
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 14, 20264:48 PM ETWhitefort Capital Management, LPand 2 others13G/A7.10%10.2M shares−2.80 ppfrom 9.90%Jun 30, 2026SEC
Feb 10, 20266:37 PM ETAsh X LPand 7 others13G/A8.50%12.3M shares+1.50 ppfrom 7.00%Dec 31, 2025SEC
Nov 14, 20254:50 PM ETWhitefort Capital Management, LPand 2 others13G/A9.90%14.2M shares+1.50 ppfrom 8.40%Sep 30, 2025SEC
Aug 27, 202510:30 AM ETAsh X LPand 4 others13G/A7.00%10.1M shares+1.70 ppfrom 5.30%Aug 26, 2025SEC
Aug 14, 20254:20 PM ETWhitefort Capital Management, LPand 2 others13G/A8.40%10.2M shares+2.40 ppfrom 6.00%Jun 30, 2025SEC
Aug 14, 202510:47 AM ETJanus Henderson Group PLC13G/A0.80%948.4K shares−5.80 ppfrom 6.60%Below 5%Jun 30, 2025SEC
Jul 1, 20252:49 PM ETAsh X LPand 3 others13G5.30%6.50M sharesNewJun 12, 2025SEC
Jun 6, 20256:42 PM ETWhitefort Capital Management, LPand 2 others13G6.00%7.31M sharesNewMay 30, 2025SEC
May 14, 202512:32 PM ETJanus Henderson Group PLC13G/A6.60%8.06M shares–Mar 31, 2025SEC
Nov 14, 2024Janus Henderson Group PLC13G/AOld format–––SEC
Jul 2, 2024Avista Capital Managing Member V, LLC13D/AOld format–––SEC
Feb 13, 2024Janus Henderson Group PLC13G/AOld format–––SEC
Jan 29, 20243:26 PM ETBlackRock Inc.13GOld format–––SEC
Mar 8, 20232:15 PM ETBlackRock Inc.13G/AOld format–––SEC
Mar 7, 202312:40 PM ETBlackRock Inc.13GOld format–New–SEC
Feb 14, 2023Citadel Advisors LLC13G/AOld format–––SEC
Feb 13, 2023Polar Asset Management Partners Inc.13G/AOld format–––SEC
Feb 13, 2023Integrated Core Strategies (US) LLC13G/AOld format–––SEC
Feb 13, 2023Janus Henderson Group PLC13GOld format–New–SEC
Feb 10, 2023Beryl Capital Management LLC13G/AOld format–––SEC
Dec 13, 2022Avista Acquisition LP II13D/AOld format–––SEC
Nov 14, 2022Avista Acquisition LP II13DOld format–––SEC
Feb 14, 2022Citadel Advisors LLC13G/AOld format–––SEC
Feb 14, 2022HGC Investment Management Inc.13GOld format–New–SEC
Feb 14, 2022Beryl Capital Management LLC13G/AOld format–––SEC
Feb 11, 2022Avista Acquisition LP II13GOld format–New–SEC
Feb 7, 2022Polar Asset Management Partners Inc.13GOld format–New–SEC
Aug 23, 2021Citadel Advisors LLC13GOld format–New–SEC
Aug 20, 2021Beryl Capital Management LLC13GOld format–New–SEC
Aug 16, 2021Integrated Core Strategies (US) LLC13GOld format–New–SEC

Form 144: proposed insider sales

1 notice from officers, directors and other affiliates planning to sell OmniAb, Inc. shares, newest first.

Form 144 notices for OABI
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
May 18, 20234:31 PM ETHiggins John LDirector61.4K$238.1KMay 18, 2023Piper Sandler & Co.SEC