MarketPeel
Insider Trading Intelligence
CD

Charles E. Davidson

TUSK
CHIEF BUSINESS OFFICER · MAMMOTH ENERGY SERVICES, INC. · CIK 0001001391
FILING MIX · LIFETIME74%/26%
BUYS
20
SELLS
7
TOTAL VALUE
$12.35M
COMPANIES
2
ACTIVE SINCE
Oct 2020
HOLDINGS NOW
6,657,275
AVG SELL PX
$2.70
TRADE KIND
SHOWING 27 / 27
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
8 backtested trades · 8 horizonsHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Charles E. Davidson, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d8+25.00%-5.05%-1.46%-3.59%-3.15%
14d8+12.50%-5.95%+0.14%-6.09%-4.42%
30d8+12.50%-5.25%+0.75%-6.00%-6.07%
60d8+100.00%+68.00%+10.97%+57.03%+58.45%
90d8+100.00%+94.47%+4.68%+89.79%+91.86%
180d8+100.00%+148.82%+4.79%+144.03%+140.46%
1y8+100.00%+88.50%+15.96%+72.54%+77.19%
2y8+100.00%+49.11%+45.70%+3.40%+3.85%
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
TUSK · 6,601,215 shares · as of Jun 17, 2026
05,608,53111,217,06316,825,59422,434,1252023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 20 buys / 7 sellsCOVERAGE · 23 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
Chief Business Officer
6,354,6676,601,215Jun 17, 2026Jun 22, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
2,403,8312,403,831Jun 17, 2026Jun 22, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
4,066,6104,066,610Jun 17, 2026Jun 22, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
Chief Business Officer
1,072,8961,451,034Jun 17, 2026Jun 22, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
Chief Business Officer
4,019,574$2.60$10.47M10,620,789Jun 17, 2026Jun 22, 2026View →
NEPH
NEPHROS INC
SALE
91,46356,060Mar 13, 2024Mar 14, 2024View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
SALE
535,36621,690,075Mar 12, 2024Mar 14, 2024View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
10,382$2.17$22.6K22,434,125Jun 17, 2022Jun 21, 2022View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
35,000$2.13$74.4K22,423,743Jun 16, 2022Jun 21, 2022View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
5,100$2.23$11.4K22,388,743Jun 15, 2022Jun 15, 2022View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
20,600$2.28$47.0K22,383,643Jun 14, 2022Jun 15, 2022View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
25,102$2.35$59.0K22,363,043Jun 13, 2022Jun 15, 2022View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
54,779$2.46$134.5K22,337,941Jun 10, 2022Jun 10, 2022View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
27,489$2.48$68.2K22,283,162Jun 9, 2022Jun 10, 2022View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
15,500$2.50$38.7K22,255,673Jun 8, 2022Jun 10, 2022View →
NEPH
NEPHROS INC
SALE
66,667$2.70$180.0K0Jun 1, 2021Jun 3, 2021View →
NEPH
NEPHROS INC
PURCHASE
66,667$2.70$180.0K3,544,492Jun 1, 2021Jun 3, 2021View →
NEPH
NEPHROS INC
SALE
4,4774,477Jan 27, 2021Jan 29, 2021View →
NEPH
NEPHROS INC
PURCHASE
3,765$3.60$13.6K101,560Jan 27, 2021Jan 29, 2021View →
NEPH
NEPHROS INC
PURCHASE
3,556$4.59$16.3K94,839Jan 27, 2021Jan 29, 2021View →
NEPH
NEPHROS INC
SALE
3,7653,765Jan 27, 2021Jan 29, 2021View →
NEPH
NEPHROS INC
PURCHASE
4,477$4.50$20.1K106,037Jan 27, 2021Jan 29, 2021View →
NEPH
NEPHROS INC
SALE
3,5563,556Jan 27, 2021Jan 29, 2021View →
NEPH
NEPHROS INC
SALE
2,9562,956Jan 27, 2021Jan 29, 2021View →
NEPH
NEPHROS INC
PURCHASE
2,956$4.14$12.2K97,795Jan 27, 2021Jan 29, 2021View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
3,1963,196Jan 6, 2021Jan 8, 2021View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
166,667$6.00$1.00M3,605,471Oct 15, 2020Oct 16, 2020View →
Other insiders · TUSK
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About this filer
CIK 0001001391
ROLE
Chief Business Officer
PRIMARY
TUSK
COMPANIES
2
ACTIVE SINCE
Oct 2020
MARKETPEEL · /INSIDER/0001001391DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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