Hennessy Advisors Inc’s Oceaneering OII Stock Holding History

Hennessy Advisors Inc’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 Q2	$10.8M	Buy	+267,086	New	+$10.1M	0.35%	66
2024 Q4	–	Sell	-1,275,800	Closed	-$31.7M	–	322
2024 Q3	$31.7M	Buy	1,275,800 +158,800	+14%	+$4.09M	1.02%	25
2024 Q2	$26.4M	Sell	1,117,000 -49,500	-4%	-$1.14M	1%	28
2024 Q1	$27.3M	Buy	1,166,500 +184,300	+19%	+$3.87M	1.15%	24
2023 Q4	$20.9M	Buy	982,200 +829,000	+541%	+$18.4M	1.05%	36
2023 Q3	$3.94M	Hold	153,200	–	–	0.28%	105
2023 Q2	$2.86M	Sell	153,200 -9,000	-6%	-$155K	0.21%	144
2023 Q1	$2.86M	Sell	162,200 -59,800	-27%	-$1.15M	0.21%	138
2022 Q4	$3.88M	Buy	222,000 +3,200	+1%	+$42.5K	0.26%	130
2022 Q3	$1.74M	Buy	218,800 +3,200	+1%	+$30.1K	0.12%	227
2022 Q2	$2.3M	Buy	215,600 +20,300	+10%	+$250K	0.14%	212
2022 Q1	$2.96M	Buy	+195,300	New	+$2.81M	0.16%	209

Other funds holding OII

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

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

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

Brown Advisory Baltimore, Maryland $64.6B AUM 18.98% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

EARNEST Partners Atlanta, Georgia $27.7B AUM 52.44% 1-Year Est. Return

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

Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return

MSIIA

Morgan Stanley Institutional Investment Advisors Greenwood Village, Colorado $1.07B AUM 29.17% 1-Year Est. Return

Hennessy Advisors Inc's OII Position: Q2 2026 in Review

Hennessy Advisors Inc opened a new position in Oceaneering (OII) in Q2 2026: 267,086 shares worth $10.8M. The stake represents 0.35% of the portfolio and ranks #66 among its holdings. This is a return to the name: Hennessy Advisors Inc previously reported a position in OII as recently as Q3 2024.

Hennessy Advisors Inc first reported a position in OII in Q1 2022 and has held it in 12 quarters since. The position peaked at $31.7M in Q3 2024. 376 funds tracked by Wall St. Rank hold OII as of Q2 2026.

Hennessy Advisors Inc held 267,086 shares of Oceaneering worth $10.8M as of Q2 2026.
Oceaneering was a new Hennessy Advisors Inc position in Q2 2026.
Oceaneering made up 0.35% of Hennessy Advisors Inc's portfolio in Q2 2026, its #66 holding.
Hennessy Advisors Inc first reported a position in Oceaneering in Q1 2022 and has held it in 12 quarters since.
Hennessy Advisors Inc's Oceaneering position peaked at $31.7M in Q3 2024.
376 funds tracked by Wall St. Rank held Oceaneering as of Q2 2026.

Based on Hennessy Advisors Inc's 13F filing for Q2 2026, filed 16 Jul 2026.