Reporting owner · CIK 0001179697
Amron Arthur H
SEC Form 4 history across 2 companies, 5 transactions and 2 filings.
DIRNEPHROS INC
Open-market transaction mix100% buys2 buys · 0 sales
Available history · May 26, 2026 – Sep 14, 2026
Latest insider transactions
Form 4 filings from available history.| Company | Insider | Activity | Disclosed value | Filed (ET) |
|---|---|---|---|---|
NEPHNEPHROS INC | Amron Arthur HDIR | J · otherSEC filing ↗ | $89.7kView disclosure → | |
NEPHNEPHROS INC | Amron Arthur HDIR | J · otherSEC filing ↗ | $0View disclosure → | |
NEPHNEPHROS INC | Amron Arthur HDIR | J · otherSEC filing ↗ | $0View disclosure → | |
TUSKMAMMOTH ENERGY SERVICES, INC. | Amron Arthur HDIR | P · buySEC filing ↗ | $9.75kView disclosure → | |
TUSKMAMMOTH ENERGY SERVICES, INC. | Amron Arthur HDIR | P · buySEC filing ↗ | $8.09kView disclosure → |
Latest Form 4 facts
Quick context from source filings
Latest open-market transaction
buy at MAMMOTH ENERGY SERVICES, INC. on May 28, 2026 valued at $9,750.
Review SEC filingLatest sale
No open-market insider sale is available.
Monthly open-market activity
Last 2 reported months · purchases and sales
View exact monthly values
| Month | Purchases | Sales | Buy value | Sale value | Net value |
|---|---|---|---|---|---|
| May 2026 | 2 | 0 | $17,849.75 | $0.00 | $17,849.75 |
| Sep 2026 | 0 | 0 | $0.00 | $0.00 | $0.00 |
Net value is disclosed purchases minus sales, not profit. A dash means the value is unavailable.
Ownership and transaction size
Ownership and ticket size
Average P/S size$8.9K
Median P/S size$8.9K
Direct3
Indirect2
Sep 14, 2026other
Filing-only signals
Deterministic matches in this insider's history
Associated companies
Companies in the disclosed reporting history
Open-market buy performance
90-day forward return on this insider's open-market purchases
For every open-market buy (Form 4 code P, acquisition A) in the selected window, we take the closing price on the transaction date and 90 calendar days later, then compute the percentage change. The figures shown are the simple average and median of those per-buy returns.
- Scope is the available history shown in this profile.
- Only buys with a resolved price context are counted.
- Includes both positive and negative outcomes; gains and losses net out at the per-buy level.
Disclosed ownership
How reported shareholdings evolved
Non-derivative shares held after reported transactions—not stock prices or a complete portfolio.
1 observations · Sep 14, 2026 – Sep 14, 2026. Window ends at the latest available report, not today.
Selected observation · Sep 14, 2026158,623 shares reported
Inspect transaction View exact observations and source transactions
| Transaction date | Shares held after | Filed | Source |
|---|---|---|---|
| Sep 14, 2026 | 158,623 | Sep 16, 2026 | View transaction |
Securities and direct/indirect ownership contexts are kept separate and never summed. Joint filings may associate the same disclosed row with multiple owners. Unknown values are omitted, not treated as zero. Lines connect observations for readability; they do not establish holdings between filings, cost basis, or current ownership. Amendments and stock splits require reviewing the source.
Amron Arthur H Insider Activity FAQ
SEC Form 4 context
Who is Amron Arthur H?
Amron Arthur H is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001179697.
Which companies has Amron Arthur H reported transactions for?
NEPHROS INC, MAMMOTH ENERGY SERVICES, INC.
When was Amron Arthur H's latest insider buy?
buy at MAMMOTH ENERGY SERVICES, INC. on May 28, 2026 valued at $9,750.
When was Amron Arthur H's latest insider sale?
No open-market insider sale is available for this period.
Where can I see the original SEC filings?
Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.
Are performance metrics included?
The profile shows average and median 90-day stock returns after open-market purchases when price coverage is available. These are unadjusted stock returns, not realized trading gains. Win rates, benchmark-adjusted returns and conviction scores are not calculated.