DOSSIER · 13F Holders · Q1 2026
OIS

OIL STS INTL INC

220 institutions still hold OIL STS INTL INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 678026105·220 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$420M
visible holders
Holders
220
filers reporting
Concentration
17.50%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

220 institutions reported OIS in Q1 2026. BlackRock, Inc. leads at 17.5% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$73M6.3M0.00%Q1 2026
02
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$41M3.5M0.01%Q1 2026
03
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$28M2.4M0.00%Q1 2026
04
ACADIAN ASSET MANAGEMENT LLC
CIK 0000916542
$27M2.4M0.04%Q1 2026
05
First Eagle Investment Management, LLC
CIK 0001325447
$24M2.0M0.04%Q1 2026
06
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$22M1.8M0.01%Q1 2026
07
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$21M1.8M0.01%Q1 2026
08
STATE STREET CORP
CIK 0000093751
$20M1.7M0.00%Q1 2026
09
Vanguard Portfolio Management
CIK 0002100121· Index
$19M1.6M0.00%Q1 2026
10
D. E. Shaw & Co., Inc.
CIK 0001009207
$18M2.6M0.01%Q4 2025
11
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$16M1.4M0.00%Q1 2026
12
MORGAN STANLEY
CIK 0000895421
$16M1.4M0.00%Q1 2026
13
DRIEHAUS CAPITAL MANAGEMENT LLC
CIK 0000938206
$15M1.3M0.11%Q1 2026
14
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$13M1.1M0.00%Q1 2026
15
KENNEDY CAPITAL MANAGEMENT LLC
CIK 0000884589
$13M1.1M0.27%Q1 2026
16
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$12M1.1M0.01%Q1 2026
17
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC
CIK 0001164833
$12M1.0M0.04%Q1 2026
18
UBS Group AG
CIK 0001610520
$10M853K0.00%Q1 2026
19
BRIDGEWAY CAPITAL MANAGEMENT, LLC
CIK 0001107261
$10M833K0.20%Q1 2026
20
JPMORGAN CHASE & CO
CIK 0000019617
$10M822K0.00%Q1 2026
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Insiders at OIL STS INTL INC
Potter Robert LHollek Darrell EVanderhider Hallie A.Wright E JosephCastillo-Rhodes DeniseDickerson Lawrence RAutenrieth Matthew EarlHajdik Lloyd A