HENNESSY ADVISORS INC

Position in OII — Oceaneering International Inc

CIK 1145255 NOVATO, CA

Position in OII

as of Jun 30, 2026 · filed Jul 16, 2026 Compact

Position Value

$10,822,324

-$20,906,822 QoQ

Shares Held

267,086

-79.1% QoQ

Ownership

0.268%

of shares outstanding

% of Portfolio

0.35%

of 13F equity value

Holder Rank

#53

of 374 holders

Holding Since

Mar 2022

12 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Energy · as of Jun 30, 2026

HENNESSY ADVISORS INC holds $27,957,720 across 7 Oil & Gas Equipment & Services names. OII ranks #1 (38.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	OII	Oceaneering International Inc This page	267,086	$10,822,324
2	EFXT	Enerflex Ltd.	346,800	$8,500,068
3	SLB	Slb Limited/Nv	136,080	$6,326,359
4	NOV	NOV Inc.	38,458	$713,395
5	HAL	Halliburton Co	20,063	$681,138
6	TS	Tenaris SA	11,958	$663,549
7	ACDC	ProFrac Holding Corp.	43,182	$250,887

12 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$10,822,324	267,086	-79.1%	Shares	Sole	2026-07-16
2024-09-30	$31,729,146	1,275,800	+14.2%	Shares	Sole	2024-10-16
2024-06-30	$26,428,220	1,117,000	-4.2%	Shares	Sole	2024-07-23
2024-03-31	$27,296,100	1,166,500	+18.8%	Shares	Sole	2024-04-16
2023-12-31	$20,901,216	982,200	+541.1%	Shares	Sole	2024-01-18
2023-09-30	$3,940,304	153,200	0.0%	Shares	Sole	2023-10-18
2023-06-30	$2,864,840	153,200	-5.5%	Shares	Sole	2023-07-17
2023-03-31	$2,859,586	162,200	-26.9%	Shares	Sole	2023-04-14
2022-12-31	$3,882,780	222,000	+1.5%	Shares	Sole	2023-01-20
2022-09-30	$1,741,648	218,800	+1.5%	Shares	Sole	2022-11-08
2022-06-30	$2,302,608	215,600	+10.4%	Shares	Sole	2022-08-12
2022-03-31	$2,960,748	195,300	—	Shares	Sole	2022-05-12
No filing history on record for this holder in this stock.