Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in OIS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 6.3M | $73.4M | -5.2% | 10.481% | 0.00% |
| 2 | DIMENSIONAL FUND ADVISORS LP | 3.5M | $41.0M | +2.6% | 5.851% | 0.01% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 2.4M | $28.1M | — | 4.016% | 0.00% |
| 4 | D. E. Shaw & Co., Inc. | 2.2M | $25.2M | -18.2% | 3.600% | 0.02% |
| 5 | First Eagle Investment Management, LLC | 2.0M | $23.8M | -20.8% | 3.395% | 0.03% |
| 6 | AMERICAN CENTURY COMPANIES INC | 1.8M | $21.5M | +14.4% | 3.070% | 0.01% |
| 7 | AQR CAPITAL MANAGEMENT LLC | 1.8M | $21.2M | +2.5% | 3.031% | 0.01% |
| 8 | STATE STREET CORP | 1.7M | $20.2M | +19.6% | 2.880% | 0.00% |
| 9 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.6M | $19.1M | — | 2.719% | 0.00% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 1.4M | $15.8M | +2.7% | 2.256% | 0.00% |
| 11 | MORGAN STANLEY | 1.4M | $15.7M | +37.5% | 2.243% | 0.00% |
| 12 | DRIEHAUS CAPITAL MANAGEMENT LLC | 1.3M | $15.5M | — | 2.206% | 0.11% |
| 13 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1M | $13.2M | -1.3% | 1.880% | 0.00% |
| 14 | KENNEDY CAPITAL MANAGEMENT, INC. | 1.1M | $12.6M | -25.8% | 1.791% | 0.27% |
| 15 | TWO SIGMA INVESTMENTS, LP | 1.1M | $12.5M | +79.6% | 1.783% | 0.01% |
| 16 | HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | 1.0M | $11.7M | -41.3% | 1.663% | 0.04% |
| 17 | MARSHALL WACE, LLP | 933K | $10.9M | — | 1.550% | 0.01% |
| 18 | UBS Group AG | 853K | $9.9M | +67.4% | 1.418% | 0.00% |
| 19 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 833K | $9.7M | -8.8% | 1.384% | 0.19% |
| 20 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 721K | $8.4M | +69.5% | 1.198% | 0.00% |
| 21 | MILLENNIUM MANAGEMENT LLC | 704K | $8.2M | +5587.1% | 1.170% | 0.01% |
| 22 | GOLDMAN SACHS GROUP INC | 702K | $8.2M | +44.4% | 1.166% | 0.00% |
| 23 | Trexquant Investment LP | 551K | $6.4M | +70.9% | 0.916% | 0.06% |
| 24 | PANAGORA ASSET MANAGEMENT INC | 540K | $6.3M | -19.1% | 0.897% | 0.02% |
| 25 | NORTHERN TRUST CORP | 462K | $5.4M | +4.8% | 0.767% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in OIS — a direct measure of their conviction.
Filings activity in OIS during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 210 | +17% | 113.52% | +49.21 pp | $581M | +77% |
| Q4 2025 | 180 | +15% | 64.31% | +5.19 pp | $329M | +8.8% |
| Q3 2025 | 156 | +3.3% | 59.12% | +8.11 pp | $303M | +16% |
| Q2 2025 | 151 | 2.6% | 51.01% | +3.56 pp | $261M | +7.5% |
| Q1 2025 | 155 | +5.4% | 47.45% | +2.71 pp | $243M | +6.1% |
| Q4 2024 | 147 | 3.3% | 44.74% | +3.93 pp | $229M | +9.6% |
| Q3 2024 | 152 | +4.1% | 40.81% | 1.48 pp | $209M | 3.5% |
| Q2 2024 | 146 | — | 42.29% | — | $216M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying OIS stock.
Based on Q1 2026 13F filings, institutional ownership of Oil States International, Inc. stands at 113.5%, held across 210 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of OIS, with approximately 6,309,631 shares worth $0.07B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of OIS, including TWO SIGMA INVESTMENTS, LP, MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for OIS is 75 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
55 institutions opened new positions in OIS during Q1 2026, while 25 fully exited. 137 added to existing positions and 18 trimmed.
OIS institutional ownership rose by 49.21 percentage points quarter-over-quarter, with a net change of +30 holders.
The top 10 institutions account for 49.8% of all reported 13F value in OIS, and the top 25 account for 76.4%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Oil States International, Inc. (OIS) Institutional Ownership