MarketPeel
Insider Trading Intelligence
AA

Arthur H. Amron

NEPH
DIRECTOR · NEPHROS INC · CIK 0001179697
FILING MIX · LIFETIME100%/0%
BUYS
33
SELLS
0
TOTAL VALUE
$111.9K
COMPANIES
2
ACTIVE SINCE
Jul 2020
HOLDINGS NOW
148,785
AVG SELL PX
TRADE KIND
SHOWING 33 / 33
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
8 backtested trades · 8 horizons · 3 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Arthur H. Amron, 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%-1.75%-0.07%-1.68%-2.01%
14d8+25.00%-1.08%+1.46%-2.54%-1.82%
30d8+12.50%-4.95%+1.75%-6.71%-8.29%
60d8+50.00%+3.49%+2.33%+1.16%-2.08%
90d8+37.50%-5.42%+3.20%-8.62%-7.60%
180d8+25.00%-1.03%+9.85%-10.88%-18.52%
1y8(1 pending)+28.57%-15.71%+12.24%-27.95%-40.14%
2y8(2 pending)+50.00%+20.50%+30.93%-19.38%-19.38%
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
NEPH · 138,456 shares · as of May 11, 2026
034,61469,228103,842138,45620222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 33 buys / 0 sellsCOVERAGE · 24 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
10,32910,329Jun 17, 2026Jun 22, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
19,12186,256Jun 17, 2026Jun 22, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
2,000$3.28$6.6K67,135Jun 12, 2026Jun 15, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
2,500$3.22$8.0K65,135Jun 11, 2026Jun 15, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
3,000$3.25$9.8K62,635May 28, 2026May 28, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
2,500$3.24$8.1K59,635May 26, 2026May 28, 2026View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
3,574138,456May 11, 2026Jun 12, 2026View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
3,610134,882Mar 16, 2026Mar 18, 2026View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
10,000$1.89$18.9K57,135Dec 11, 2025Dec 15, 2025View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
5,391131,272Nov 10, 2025Nov 13, 2025View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
7,0507,050Jan 1, 2025Jan 3, 2025View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
22,418125,881Jan 1, 2025Jan 3, 2025View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
1,000$2.97$3.0K47,135Dec 12, 2024Dec 16, 2024View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASEGRANT
Stock grant
27,85646,135Jun 12, 2024Jun 14, 2024View →
NEPH
NEPHROS INC
PURCHASE
3,000$2.24$6.7K103,463May 30, 2024May 30, 2024View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
3,000$3.65$10.9K18,279May 30, 2024May 30, 2024View →
NEPH
NEPHROS INC
PURCHASE
2,000$2.22$4.4K100,463May 28, 2024May 30, 2024View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
2,000$3.57$7.1K15,279May 28, 2024May 30, 2024View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
7,3237,323May 14, 2024May 16, 2024View →
NEPH
NEPHROS INC
PURCHASE
91,46398,463Mar 13, 2024Mar 14, 2024View →
NEPH
NEPHROS INC
PURCHASE
7,000$2.45$17.1K7,000Mar 12, 2024Mar 14, 2024View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASE
3,000$3.72$11.2K13,279Mar 12, 2024Mar 14, 2024View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
9,2919,291Dec 13, 2023Dec 15, 2023View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASEGRANT
Stock grant
23,81023,810Jun 7, 2023Jun 8, 2023View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
27,61327,613Jan 5, 2023Jan 9, 2023View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
7,0807,080Jan 5, 2023Jan 9, 2023View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASEGRANT
Stock grant
45,66245,662Jun 29, 2022Jun 30, 2022View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
7,0627,062Dec 14, 2021Dec 16, 2021View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
4,5824,582Dec 14, 2021Dec 16, 2021View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASEGRANT
Stock grant
25,64125,641Jun 2, 2021Jun 4, 2021View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
3,6663,666Jan 6, 2021Jan 8, 2021View →
NEPH
NEPHROS INC
PURCHASEGRANT
Stock grant
6,8506,850Jan 6, 2021Jan 8, 2021View →
TUSK
MAMMOTH ENERGY SERVICES, INC.
PURCHASEGRANT
Stock grant
86,95786,957Jul 2, 2020Jul 7, 2020View →
Other insiders · NEPH
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About this filer
CIK 0001179697
ROLE
Director
PRIMARY
NEPH
COMPANIES
2
ACTIVE SINCE
Jul 2020
MARKETPEEL · /INSIDER/0001179697DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

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