CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Position in TUSK — Mammoth Energy Services, Inc.
CIK 884546
SAN FRANCISCO, CA
Position in TUSK
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$144,209
+$13,463 QoQ
Shares Held
58,861
-16.7% QoQ
Ownership
0.122%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
22 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in TUSK Over Time
Shares Held
Position Value (USD)
Position in Conglomerates
Industrials · as of Mar 31, 2026CHARLES SCHWAB INVESTMENT MANAGEMENT INC holds $1,755,315,864 across 19 Conglomerates names. TUSK ranks #18 (0.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | HON |
Honeywell International Inc
|
4,037,643 | $957,135,386 | |
| 2 | MMM |
3M Co
|
3,431,930 | $498,419,193 | |
| 3 | VMI |
Valmont Industries Inc
|
255,049 | $101,909,928 | |
| 4 | GHC |
Graham Holdings Co
|
44,148 | $46,675,914 | |
| 5 | OTTR |
Otter Tail Corp
|
524,121 | $46,002,100 | |
| 6 | SEB |
Seaboard Corp /De/
|
6,036 | $34,127,664 | |
| 7 | DLX |
Deluxe Corp
|
1,068,025 | $29,413,408 | |
| 8 | MATW |
Matthews International Corp
|
590,357 | $15,243,017 |
All Filings in TUSK
Export CSV
22 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $144,209 | 58,861 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $130,746 | 70,674 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $161,843 | 70,674 | Shares | Sole | 2025-11-10 | |
| 2025-06-30 | $197,887 | 70,674 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $144,174 | 70,674 | Shares | Sole | 2025-09-15 | |
| 2024-12-31 | $212,022 | 70,674 | Shares | Sole | 2025-02-06 | |
| 2024-09-30 | $260,164 | 63,610 | Shares | Sole | 2024-11-12 | |
| 2024-06-30 | $209,857 | 63,981 | Shares | Sole | 2024-08-12 | |
| 2024-03-31 | $232,890 | 63,981 | Shares | Sole | 2024-05-09 | |
| 2023-12-31 | $285,355 | 63,981 | Shares | Sole | 2024-02-06 | |
| 2023-09-30 | $296,871 | 63,981 | Shares | Sole | 2023-11-08 | |
| 2023-06-30 | $309,028 | 63,981 | Shares | Sole | 2023-08-10 | |
| 2023-03-31 | $45,318 | 10,739 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $92,892 | 10,739 | Shares | Sole | 2023-02-13 | |
| 2022-09-30 | $36,619 | 10,739 | Shares | Sole | 2022-11-14 | |
| 2021-12-31 | $28,834 | 15,843 | Shares | Sole | 2022-02-11 | |
| 2021-09-30 | $46,103 | 15,843 | Shares | Sole | 2021-11-16 | |
| 2021-06-30 | $72,719 | 15,843 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $84,284 | 15,843 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $70,501 | 15,843 | Shares | Sole | 2021-02-16 | |
| 2020-06-30 | $61,572 | 52,180 | Shares | Sole | 2020-08-20 | |
| 2020-03-31 | $53,678 | 71,667 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||