Boston Partners
- SEC CIK
- 0001386060
- Latest filing
- Aug 4, 2026
TUSK holding history
Mammoth Energy Services, Inc. in every 13F filed by Boston Partners, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.
TUSK overviewAll 13F holders of TUSKFull Q2 2026 holdings
- Shares (Q2 2026)
- 68,935
- Value
- $224.0K
- % of portfolio
- <0.1%
- Quarters held
- 12
- Since Q2 2021
| Quarter | Shares | Value | % of portfolio | Share change | Action | All holders |
|---|---|---|---|---|---|---|
| Q2 2026 | 68,935 | $224.0K | <0.1% | −85,453−55.3% | Reduced | Holders |
| Q1 2026 | 154,388 | $378.3K | <0.1% | +154,388 | New | Holders |
| Q4 2023 | 0 | $0 | 0.0% | −35,093−100.0% | Sold out | Holders |
| Q3 2023 | 35,093 | $162.8K | <0.1% | −27,093−43.6% | Reduced | Holders |
| Q2 2023 | 62,186 | $300.4K | <0.1% | +21,758+53.8% | Added | Holders |
| Q1 2023 | 40,428 | $170.6K | <0.1% | −4,645−10.3% | Reduced | Holders |
| Q4 2022 | 45,073 | $389.9K | <0.1% | 00.0% | Unchanged | Holders |
| Q3 2022 | 45,073 | $154.0K | <0.1% | −27,079−37.5% | Reduced | Holders |
| Q2 2022 | 72,152 | $159.0K | <0.1% | −70,110−49.3% | Reduced | Holders |
| Q1 2022 | 142,262 | $303.0K | <0.1% | +79,561+126.9% | Added | Holders |
| Q4 2021 | 62,701 | $114.0K | <0.1% | −13,677−17.9% | Reduced | Holders |
| Q3 2021 | 76,378 | $222.0K | <0.1% | +28,653+60.0% | Added | Holders |
| Q2 2021 | 47,725 | $219.0K | <0.1% | +47,725 | New | Holders |