William Blair & Company’s OmniAb OABI Stock Holding History

William Blair & Company’s Portfolio OABI Stock Details OABI Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$107K	Buy	43,394 +178	+0.4%	+$353	﹤0.01%	1674
2026 Q1	$67.8K	Buy	43,216 +5	+0%	+$9	﹤0.01%	1654
2025 Q4	$79.9K	Sell	43,211 -1,960	-4%	-$3.41K	﹤0.01%	1604
2025 Q3	$72.3K	Hold	45,171	–	–	﹤0.01%	1599
2025 Q2	$78.6K	Hold	45,171	–	–	﹤0.01%	1552
2025 Q1	$108K	Hold	45,171	–	–	﹤0.01%	1488
2024 Q4	$160K	Sell	45,171 -1,960	-4%	-$7.75K	﹤0.01%	1478
2024 Q3	$199K	Sell	47,131 -220	-0.5%	-$951	﹤0.01%	1442
2024 Q2	$178K	Sell	47,351 -49	-0.1%	-$223	﹤0.01%	1439
2024 Q1	$257K	Sell	47,400 -1,960	-4%	-$11.3K	﹤0.01%	1312
2023 Q4	$305K	Sell	49,360 -279	-0.6%	-$1.37K	﹤0.01%	1241
2023 Q3	$258K	Hold	49,639	–	–	﹤0.01%	1298
2023 Q2	$250K	Sell	49,639 -466	-0.9%	-$1.89K	﹤0.01%	1324
2023 Q1	$184K	Sell	50,105 -24	-0%	-$91	﹤0.01%	1415
2022 Q4	$180K	Buy	+50,129	New	+$263K	﹤0.01%	1388

Other funds holding OABI

WCM

Whitefort Capital Management New York $406M AUM 84.26% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Nomura Holdings Tokyo, Japan $85.4B AUM 91.09% 1-Year Est. Return

CCM

Cadian Capital Management New York $1.32B AUM 4.19% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

RHJA

Rice Hall James & Associates San Diego, California $2.05B AUM 43.16% 1-Year Est. Return

PMG

Private Management Group Irvine, California $3.8B AUM 23.19% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

William Blair & Company's OABI Position: Q2 2026 in Review

William Blair & Company increased its OmniAb (OABI) stake by 0.41% in Q2 2026, buying an estimated $353 and bringing the position to 43,394 shares worth $107K. The position accounts for ﹤0.01% of the portfolio, ranked #1674.

William Blair & Company first reported a position in OABI in Q4 2022 and has held it in 15 quarters since. The position peaked at $305K in Q4 2023. 131 funds tracked by Wall St. Rank hold OABI as of Q2 2026.

William Blair & Company held 43,394 shares of OmniAb worth $107K as of Q2 2026.
William Blair & Company bought 178 OmniAb shares in Q2 2026, an estimated $353.
OmniAb made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1674 holding.
William Blair & Company first reported a position in OmniAb in Q4 2022 and has held it in 15 quarters since.
William Blair & Company's OmniAb position peaked at $305K in Q4 2023.
131 funds tracked by Wall St. Rank held OmniAb as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.