OIL STATES INTERNATIONAL INC (OIS) Top Institutional Shareholders
OIL STATES INTERNATIONAL INC (OIS) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $585.96M in OIS holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of OIS tracked by InsiderSet, reporting ownership valued at approximately $73.44M in its March 31, 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 $50.79M, representing an estimated loss of -30.84% 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
212
Total Reported Value
$585.96M
Largest Holder
Blackrock, Inc.
Largest Position
$73.44M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
164
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% | 6,309,631 | $73,444,103 | $50,792,530 | -$22,651,573 | -30.84% | |
| Dimensional Fund Advisors Lp | 0.01% | 3,522,143 | $40,997,966 | $28,353,251 | -$12,644,715 | -30.84% | |
| Vanguard Capital Management Llc | 0.00% | 2,417,559 | $28,140,387 | $19,461,350 | -$8,679,037 | -30.84% | |
| D. E. Shaw & Co., Inc. | 0.02% | 2,167,272 | $25,227,046 | $17,446,540 | -$7,780,506 | -30.84% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.03% | 2,043,709 | $23,788,772 | $16,451,857 | -$7,336,915 | -30.84% |
| American Century Companies Inc | 0.01% | 1,848,308 | $21,514,305 | $14,878,879 | -$6,635,426 | -30.84% | |
| Aqr Capital Management Llc | 0.01% | 1,824,715 | $21,239,683 | $14,688,956 | -$6,550,727 | -30.84% | |
| State Street Corp | 0.00% | 1,733,499 | $20,177,928 | $13,954,667 | -$6,223,261 | -30.84% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,636,824 | $19,052,631 | $13,176,433 | -$5,876,198 | -30.84% | |
| Geode Capital Management, Llc | 0.00% | 1,357,790 | $15,808,754 | $10,930,210 | -$4,878,544 | -30.86% | |
| Morgan Stanley | 0.00% | 1,350,160 | $15,715,862 | $10,868,788 | -$4,847,074 | -30.84% | |
| Driehaus Capital Management Llc | 0.11% | 1,328,078 | $15,458,828 | $10,691,028 | -$4,767,800 | -30.84% | |
| Charles Schwab Investment Management Inc | 0.00% | 1,131,609 | $13,171,929 | $9,109,452 | -$4,062,477 | -30.84% | |
| Kennedy Capital Management Llc | 0.27% | 1,078,399 | $12,552,564 | $8,681,112 | -$3,871,452 | -30.84% | |
| Two Sigma Investments, Lp | 0.01% | 1,073,304 | $12,493,259 | $8,640,097 | -$3,853,162 | -30.84% | |
| Hotchkis & Wiley Capital Management Llc | 0.04% | 1,001,051 | $11,652,234 | $8,058,461 | -$3,593,773 | -30.84% | |
| Marshall Wace, Llp | 0.01% | 932,772 | $10,857,467 | $7,508,815 | -$3,348,652 | -30.84% | |
| Ubs Group Ag | 0.00% | 853,474 | $9,934,438 | $6,870,466 | -$3,063,972 | -30.84% | |
| Bridgeway Capital Management, Llc | 0.19% | 832,905 | $9,695,014 | $6,704,885 | -$2,990,129 | -30.84% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 721,401 | $8,397,108 | $5,807,278 | -$2,589,830 | -30.84% | |
| Millennium Management Llc | 0.01% | 704,411 | $8,199,344 | $5,670,509 | -$2,528,835 | -30.84% | |
| Goldman Sachs Group Inc | 0.00% | 702,085 | $8,172,269 | $5,651,784 | -$2,520,485 | -30.84% | |
| Trexquant Investment Lp | 0.05% | 551,183 | $6,415,770 | $4,437,023 | -$1,978,747 | -30.84% | |
| Panagora Asset Management Inc | 0.02% | 539,920 | $6,284,669 | $4,346,356 | -$1,938,313 | -30.84% | |
| Northern Trust Corp | 0.00% | 461,591 | $5,372,919 | $3,715,808 | -$1,657,111 | -30.84% | |
| Ameriprise Financial Inc | 0.00% | 456,119 | $5,309,224 | $3,671,758 | -$1,637,466 | -30.84% | |
| Jane Street Group, Llc | 0.01% | 454,245 | $5,287,412 | $3,656,672 | -$1,630,740 | -30.84% | |
| Sei Investments Co | 0.00% | 441,725 | $5,141,677 | $3,555,886 | -$1,585,791 | -30.84% | |
| Federated Hermes, Inc. | 0.01% | 414,123 | $4,820,392 | $3,333,690 | -$1,486,702 | -30.84% | |
| Empowered Funds, Llc | 0.03% | 402,205 | $4,681,666 | $3,237,750 | -$1,443,916 | -30.84% | |
| Franklin Resources Inc | 0.00% | 395,901 | $4,608,288 | $3,187,003 | -$1,421,285 | -30.84% | |
| Vanguard Fiduciary Trust Co | 0.00% | 365,048 | $4,249,159 | $2,938,636 | -$1,310,523 | -30.84% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | 361,554 | $4,208,489 | $2,910,510 | -$1,297,979 | -30.84% | |
| Hara Capital Llc | 1.96% | 336,828 | $3,920,678 | $2,711,465 | -$1,209,213 | -30.84% | |
| Bank Of New York Mellon Corp | 0.00% | 324,428 | $3,776,343 | $2,611,645 | -$1,164,698 | -30.84% | |
| Invesco Ltd. | 0.00% | 311,490 | $3,625,744 | $2,507,495 | -$1,118,250 | -30.84% | |
| Russell Investments Group, Ltd. | 0.00% | 309,464 | $3,602,158 | $2,491,185 | -$1,110,973 | -30.84% | |
| Deutsche Bank Ag\ | 0.00% | 301,566 | $3,510,228 | $2,427,606 | -$1,082,622 | -30.84% | |
| Massachusetts Financial Services Co | 0.00% | 299,371 | $3,484,679 | $2,409,937 | -$1,074,742 | -30.84% | |
| Gendell Jeffrey L | 0.05% | 298,317 | $3,472,410 | $2,401,452 | -$1,070,958 | -30.84% | |
| Fmr Llc | 0.00% | 266,603 | $3,103,255 | $2,146,154 | -$957,101 | -30.84% | |
| Eversource Wealth Advisors, Llc | 0.09% | 59,647 | $2,792,709 | $480,158 | -$2,312,551 | -82.81% | |
| State Board Of Administration Of Florida Retirement System | 0.00% | 222,793 | $2,593,311 | $1,793,484 | -$799,827 | -30.84% | |
| Qube Research & Technologies Ltd | 0.00% | 198,511 | $2,310,668 | $1,598,014 | -$712,654 | -30.84% | |
| Fisher Asset Management, Llc | 0.00% | 198,305 | $2,308,270 | $1,596,355 | -$711,915 | -30.84% | |
| Raymond James Financial Inc | 0.00% | 193,930 | $2,257,345 | $1,561,137 | -$696,208 | -30.84% | |
| State Of Wisconsin Investment Board | 0.00% | 160,815 | $1,871,887 | $1,294,561 | -$577,326 | -30.84% | |
| Creative Planning | 0.00% | 157,809 | $1,836,897 | $1,270,362 | -$566,535 | -30.84% | |
| O'Shaughnessy Asset Management, Llc | 0.01% | 157,731 | $1,835,989 | $1,269,735 | -$566,254 | -30.84% | |
| Los Angeles Capital Management Llc | 0.01% | 155,815 | $1,813,687 | $1,254,311 | -$559,376 | -30.84% |
Frequently asked questions about OIS
Who owns the most OIS stock?
The largest holders of OIS are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for OIL STATES INTERNATIONAL INC (OIS).
Is OIS widely held by superinvestors?
Many widely followed stocks like OIS appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly OIS is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.