William Blair & Company’s Oceaneering OII Stock Holding History

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

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$352K	Sell	9,910 -20	-0.2%	-$647	﹤0.01%	1272
2025 Q4	$239K	Sell	9,930 -34	-0.3%	-$821	﹤0.01%	1396
2025 Q3	$247K	Buy	+9,964	New	+$229K	﹤0.01%	1385
2015 Q2	–	Sell	-439,749	Closed	-$23.7M	–	2226
2015 Q1	$23.7M	Buy	439,749 +9,903	+2%	+$528K	0.04%	537
2014 Q4	$25.3M	Buy	429,846 +27,634	+7%	+$1.77M	0.04%	518
2014 Q3	$26.2M	Sell	402,212 -47,838	-11%	-$3.31M	0.04%	472
2014 Q2	$35.2M	Sell	450,050 -13,474	-3%	-$988K	0.06%	407
2014 Q1	$33.3M	Sell	463,524 -7,602	-2%	-$544K	0.06%	407
2013 Q4	$37.2M	Sell	471,126 -317,539	-40%	-$25.8M	0.06%	396
2013 Q3	$64.1M	Sell	788,665 -286,498	-27%	-$23M	0.11%	267
2013 Q2	$77.6M	Buy	+1,075,163	New	+$75.1M	0.15%	198

Other funds holding OII

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Brown Advisory Baltimore, Maryland $60.9B AUM 15.24% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

EARNEST Partners Atlanta, Georgia $24.3B AUM 34.41% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

MSIIA

Morgan Stanley Institutional Investment Advisors Greenwood Village, Colorado $1.04B AUM 22.76% 1-Year Est. Return

Neuberger Berman Group New York $131B AUM 28.36% 1-Year Est. Return

William Blair & Company's OII Position: Q1 2026 in Review

William Blair & Company reduced its Oceaneering (OII) stake by 0.2% in Q1 2026, selling an estimated $647 and leaving 9,910 shares worth $352K. The position accounts for ﹤0.01% of the portfolio, ranked #1272.

William Blair & Company first reported a position in OII in Q2 2013 and has held it in 11 quarters since. The position peaked at $77.6M in Q2 2013. 366 funds tracked by Wall St. Rank hold OII as of Q1 2026.

William Blair & Company held 9,910 shares of Oceaneering worth $352K as of Q1 2026.
William Blair & Company sold 20 Oceaneering shares in Q1 2026, an estimated $647.
Oceaneering made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1272 holding.
William Blair & Company first reported a position in Oceaneering in Q2 2013 and has held it in 11 quarters since.
William Blair & Company's Oceaneering position peaked at $77.6M in Q2 2013.
366 funds tracked by Wall St. Rank held Oceaneering as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.