OIS Institutional Ownership & Shareholders
OIL STATES INTERNATIONAL INC (OIS) is currently held by 200 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $425.26M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of OIS tracked by InsiderSet, reporting ownership valued at approximately $54.61M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $65.46M, representing an estimated gain of +19.85% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% of the total disclosed OIS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Dimensional Fund Advisors Lp, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in OIL STATES INTERNATIONAL INC (OIS).
This page ranks the largest institutional OIS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
200
Total Reported Value
$425.26M
Largest Holder
Blackrock, Inc.
Largest Position
$54.61M
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
63
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 6,818,282 | $54,614,438 | $65,455,507 | +$10,841,069 | +19.85% | |
| Dimensional Fund Advisors Lp | 0.00% | 3,006,491 | $24,081,944 | $28,862,314 | +$4,780,370 | +19.85% | |
| Vanguard Capital Management Llc | 0.00% | 2,418,106 | $19,369,029 | $23,213,818 | +$3,844,789 | +19.85% | |
| American Century Companies Inc | 0.01% | 2,213,177 | $17,727,548 | $21,246,499 | +$3,518,951 | +19.85% | |
| Acadian Asset Management Llc | 0.02% | 2,042,288 | $16,350,000 | $19,605,965 | +$3,255,965 | +19.91% | |
| D. E. Shaw & Co., Inc. | 0.01% | 2,017,956 | $16,163,828 | $19,372,378 | +$3,208,550 | +19.85% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.03% | 2,005,677 | $16,065,473 | $19,254,499 | +$3,189,026 | +19.85% |
| State Street Corp | 0.00% | 1,980,909 | $15,866,856 | $19,016,726 | +$3,149,870 | +19.85% | |
| Aqr Capital Management Llc | 0.00% | 1,736,910 | $13,912,648 | $16,674,336 | +$2,761,688 | +19.85% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,625,098 | $13,017,035 | $15,600,941 | +$2,583,906 | +19.85% | |
| Geode Capital Management, Llc | 0.00% | 1,445,708 | $11,583,122 | $13,878,797 | +$2,295,675 | +19.82% | |
| Two Sigma Investments, Lp | 0.01% | 1,444,776 | $11,572,656 | $13,869,850 | +$2,297,194 | +19.85% | |
| Kennedy Capital Management Llc | 0.18% | 1,291,140 | $10,342,031 | $12,394,944 | +$2,052,913 | +19.85% | |
| Morgan Stanley | 0.00% | 1,206,130 | $9,661,102 | $11,578,848 | +$1,917,746 | +19.85% | |
| Qube Research & Technologies Ltd | 0.01% | 1,122,386 | $8,990,312 | $10,774,906 | +$1,784,594 | +19.85% | |
| Hotchkis & Wiley Capital Management Llc | 0.03% | 1,100,201 | $8,812,610 | $10,561,930 | +$1,749,320 | +19.85% | |
| Charles Schwab Investment Management Inc | 0.00% | 1,083,987 | $8,682,736 | $10,406,275 | +$1,723,539 | +19.85% | |
| Bridgeway Capital Management, Llc | 0.12% | 840,237 | $6,730,298 | $8,066,275 | +$1,335,977 | +19.85% | |
| Algert Global Llc | 0.08% | 813,971 | $6,519,908 | $7,814,122 | +$1,294,214 | +19.85% | |
| Millennium Management Llc | 0.00% | 667,842 | $5,349,414 | $6,411,283 | +$1,061,869 | +19.85% | |
| Federated Hermes, Inc. | 0.01% | 651,708 | $5,220,181 | $6,256,397 | +$1,036,216 | +19.85% | |
| Panagora Asset Management Inc | 0.02% | 650,275 | $5,208,703 | $6,242,640 | +$1,033,937 | +19.85% | |
| Ubs Group Ag | 0.00% | 646,012 | $5,174,557 | $6,201,715 | +$1,027,158 | +19.85% | |
| Trexquant Investment Lp | 0.03% | 602,932 | $4,829,485 | $5,788,147 | +$958,662 | +19.85% | |
| Fmr Llc | 0.00% | 558,454 | $4,473,214 | $5,361,158 | +$887,944 | +19.85% | |
| Goldman Sachs Group Inc | 0.00% | 542,442 | $4,344,960 | $5,207,443 | +$862,483 | +19.85% | |
| Northern Trust Corp | 0.00% | 498,126 | $3,989,989 | $4,782,010 | +$792,021 | +19.85% | |
| Ameriprise Financial Inc | 0.00% | 459,434 | $3,680,067 | $4,410,566 | +$730,499 | +19.85% | |
| Norges Bank | 0.00% | 445,100 | $3,565,251 | $4,272,960 | +$707,709 | +19.85% | |
| Empowered Funds, Llc | 0.02% | 409,537 | $3,280,391 | $3,931,555 | +$651,164 | +19.85% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | 404,650 | $3,241,247 | $3,884,640 | +$643,393 | +19.85% | |
| Squarepoint Ops Llc | 0.01% | 399,706 | $3,201,645 | $3,837,178 | +$635,533 | +19.85% | |
| Russell Investments Group, Ltd. | 0.00% | 378,012 | $3,027,882 | $3,628,915 | +$601,033 | +19.85% | |
| Vanguard Fiduciary Trust Co | 0.00% | 369,431 | $2,959,142 | $3,546,538 | +$587,396 | +19.85% | |
| Hara Capital Llc | 1.28% | 335,818 | $2,669,753 | $3,223,853 | +$554,100 | +20.75% | |
| Bank Of New York Mellon Corp | 0.00% | 329,168 | $2,636,635 | $3,160,013 | +$523,378 | +19.85% | |
| Deutsche Bank Ag\ | 0.00% | 309,870 | $2,482,059 | $2,974,752 | +$492,693 | +19.85% | |
| Gendell Jeffrey L | 0.02% | 298,317 | $2,389,520 | $2,863,843 | +$474,323 | +19.85% | |
| Massachusetts Financial Services Co | 0.00% | 293,356 | $2,349,782 | $2,816,218 | +$466,436 | +19.85% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 278,957 | $2,234,446 | $2,677,987 | +$443,541 | +19.85% | |
| Marshall Wace, Llp | 0.00% | 241,635 | $1,935,497 | $2,319,696 | +$384,199 | +19.85% | |
| State Of Wisconsin Investment Board | 0.00% | 220,231 | $1,764,050 | $2,114,218 | +$350,168 | +19.85% | |
| Lsv Asset Management | 0.00% | 201,400 | $1,613,000 | $1,933,440 | +$320,440 | +19.87% | |
| Fisher Asset Management, Llc | 0.00% | 198,305 | $1,588,423 | $1,903,728 | +$315,305 | +19.85% | |
| Invesco Ltd. | 0.00% | 197,254 | $1,580,005 | $1,893,638 | +$313,633 | +19.85% | |
| Raymond James Financial Inc | 0.00% | 179,343 | $1,436,537 | $1,721,693 | +$285,156 | +19.85% | |
| Jpmorgan Chase & Co | 0.00% | 174,170 | $1,393,360 | $1,672,032 | +$278,672 | +20.00% | |
| Wedge Capital Management L L P/Nc | 0.02% | 174,740 | $1,389,183 | $1,677,504 | +$288,321 | +20.75% | |
| O'Shaughnessy Asset Management, Llc | 0.01% | 172,626 | $1,382,734 | $1,657,210 | +$274,476 | +19.85% | |
| Vanguard Global Advisers, Llc | 0.00% | 163,468 | $1,309,379 | $1,569,293 | +$259,914 | +19.85% |
Frequently asked questions about OIS
Who are the largest institutional holders of OIS?
The largest institutional holders of OIS reported in the latest SEC Form 13F filings include Blackrock, Inc., Dimensional Fund Advisors Lp, Vanguard Capital Management Llc, American Century Companies Inc, and Acadian Asset Management Llc. InsiderSet ranks institutional holders by their latest reported OIS position.
What is OIS institutional ownership?
This page tracks OIS positions reported by institutional investment managers through SEC Form 13F. OIL STATES INTERNATIONAL INC (OIS) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own OIS?
InsiderSet currently tracks 200 institutional managers reporting OIS holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of OIS shareholders.
How much OIS stock do institutions own?
Institutional investment managers disclosed approximately $425.26M in OIS holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was OIS institutional ownership last updated?
The latest OIS institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional OIS holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its OIS position after the reporting date.
Are institutions buying or selling OIS?
Institutional buying and selling can be analyzed by comparing OIS positions across consecutive 13F reporting periods. InsiderSet's OIS Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View OIS ownership changes.
How has OIS institutional ownership changed over time?
InsiderSet tracks OIS institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.