As of the latest Form 4 filed May 14, 2026.
What NET Power Inc. insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 34 most recent filings for NPWR.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-05-14 | 2026-05-13 | NPEH, LLC 10% owner | SSale | −35.0K | $2.43 | $85.2K | No | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | 8 Rivers Capital, LLC 10% owner | SSale | −35.0K | $2.43 | $85.2K | No | Form 4 ↗ |
| 2026-05-14 | 2026-05-12 | NPEH, LLC 10% owner | SSale | −400K | $2.44 | $976K | No | Form 4 ↗ |
| 2026-05-14 | 2026-05-12 | 8 Rivers Capital, LLC 10% owner | SSale | −400K | $2.44 | $976K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-12 | 8 Rivers Capital, LLC 10% owner | SSale | −150K | $2.03 | $305K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-12 | NPEH, LLC 10% owner | SSale | −150K | $2.03 | $305K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-11 | 8 Rivers Capital, LLC 10% owner | SSale | −60.0K | $2.02 | $121K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-11 | NPEH, LLC 10% owner | SSale | −60.0K | $2.02 | $121K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-10 | 8 Rivers Capital, LLC 10% owner | SSale | −40.0K | $2.08 | $83.2K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-10 | NPEH, LLC 10% owner | SSale | −40.0K | $2.08 | $83.2K | No | Form 4 ↗ |
| 2026-02-02 | 2026-01-29 | NPEH, LLC 10% owner | SSale | −54.8K | $2.35 | $129K | No | Form 4 ↗ |
| 2026-02-02 | 2026-01-29 | 8 Rivers Capital, LLC 10% owner | SSale | −54.8K | $2.35 | $129K | No | Form 4 ↗ |
| 2026-01-28 | 2026-01-28 | 8 Rivers Capital, LLC 10% owner | SSale | −65.2K | $2.38 | $155K | No | Form 4 ↗ |
| 2026-01-28 | 2026-01-28 | NPEH, LLC 10% owner | SSale | −65.2K | $2.38 | $155K | No | Form 4 ↗ |
| 2026-01-28 | 2026-01-27 | 8 Rivers Capital, LLC 10% owner | SSale | −100K | $2.38 | $238K | No | Form 4 ↗ |
| 2026-01-28 | 2026-01-27 | NPEH, LLC 10% owner | SSale | −100K | $2.38 | $238K | No | Form 4 ↗ |
| 2026-01-28 | 2026-01-26 | 8 Rivers Capital, LLC 10% owner | SSale | −130K | $2.35 | $306K | No | Form 4 ↗ |
| 2026-01-28 | 2026-01-26 | NPEH, LLC 10% owner | SSale | −130K | $2.35 | $306K | No | Form 4 ↗ |
| 2026-01-16 | 2026-01-16 | 8 Rivers Capital, LLC 10% owner | SSale | −230K | $2.63 | $605K | No | Form 4 ↗ |
| 2026-01-16 | 2026-01-16 | NPEH, LLC 10% owner | SSale | −230K | $2.63 | $605K | No | Form 4 ↗ |
| 2026-01-16 | 2026-01-15 | 8 Rivers Capital, LLC 10% owner | SSale | −135K | $2.57 | $347K | No | Form 4 ↗ |
| 2026-01-16 | 2026-01-15 | NPEH, LLC 10% owner | SSale | −135K | $2.57 | $347K | No | Form 4 ↗ |
| 2026-01-16 | 2026-01-14 | 8 Rivers Capital, LLC 10% owner | SSale | −135K | $2.74 | $370K | No | Form 4 ↗ |
| 2026-01-16 | 2026-01-14 | NPEH, LLC 10% owner | SSale | −135K | $2.74 | $370K | No | Form 4 ↗ |
| 2025-12-29 | 2025-12-24 | NPEH, LLC 10% owner | SSale | −170K | $2.21 | $376K | No | Form 4 ↗ |
| 2025-12-29 | 2025-12-24 | 8 Rivers Capital, LLC 10% owner | SSale | −170K | $2.21 | $376K | No | Form 4 ↗ |
| 2025-12-23 | 2025-12-23 | NPEH, LLC 10% owner | SSale | −130K | $2.17 | $282K | No | Form 4 ↗ |
| 2025-12-23 | 2025-12-23 | 8 Rivers Capital, LLC 10% owner | SSale | −130K | $2.17 | $282K | No | Form 4 ↗ |
| 2025-12-23 | 2025-12-22 | NPEH, LLC 10% owner | SSale | −100K | $2.26 | $226K | No | Form 4 ↗ |
| 2025-12-23 | 2025-12-22 | 8 Rivers Capital, LLC 10% owner | SSale | −100K | $2.26 | $226K | No | Form 4 ↗ |
| 2025-12-23 | 2025-12-19 | NPEH, LLC 10% owner | SSale | −100K | $2.34 | $234K | No | Form 4 ↗ |
| 2025-12-23 | 2025-12-19 | 8 Rivers Capital, LLC 10% owner | SSale | −100K | $2.34 | $234K | No | Form 4 ↗ |
| 2025-12-11 | 2025-12-09 | NPEH, LLC 10% owner | SSale | −40.0K | $2.82 | $113K | No | Form 4 ↗ |
| 2025-12-11 | 2025-12-09 | 8 Rivers Capital, LLC 10% owner | SSale | −40.0K | $2.82 | $113K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also NPWR’s full analysis or the market-wide insider trading feed. The tabs above jump to NPWR’s other SEC data.
Source: SEC Form 4 filings for NPWR, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.