Insider · CIK 0001981100
8 Rivers Capital, LLC
owner
Files at NPWR (NET Power Inc.). First filing Oct 11, 2024, latest Sep 10, 2026.
In brief
8 Rivers Capital, LLC files SEC Form 4 as 10% owner at NPWR (NET Power Inc.). Since Oct 11, 2024, 8 Rivers Capital, LLC has reported 0 open-market buys worth $0 and 32 open-market sells worth $45M, the latest filed on Sep 10, 2026.
A track record needs three past buys with six months of prices behind them; 8 Rivers Capital, LLC has 0, so none is measured yet.
The newest scored trade: sold $470k of NPWR on Sep 8, 2026, filed Sep 10, 2026, scored 47 (moderate). In the last 12 months: 0 buys worth $0 and 28 sells worth $22M.
Track record
Not enough history
Fewer than three past buys with six months of prices.
Median 6-month excess
-
after past buys, n = 0
Hit rate
-
past buys that beat the index over 6 months
Open-market trades
0 / 32
$0 bought, $45M sold
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
NPWR: NET Power Inc.
NPWROct 9, 2026 · close 1.23
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 47Moderate | NET Power Inc. | $470k 250,000 shares | -25% | +40% from low-61% from high | |
| 42Moderate | NET Power Inc. | $463k 242,900 shares | -20% | +43% from low-60% from high | |
| 55Moderate | NET Power Inc. | $1.4M 757,100 shares | -38% | +20% from low-66% from high | |
| 33Weak | NET Power Inc. | $234k 150,745 shares | -7% | +12% from low-69% from high | |
| 43Moderate | NET Power Inc. | $531k 349,255 shares | -14% | +13% from low-68% from high | |
| 35Weak | NET Power Inc. | $367k 255,858 shares | -9% | +1% from low-71% from high | |
| 34Weak | NET Power Inc. | $319k 209,142 shares | -7% | +6% from low-68% from high | |
| 50Moderate | NET Power Inc. | $1.1M 435,000 shares | -13% | +66% from low-49% from high | |
| 37Weak | NET Power Inc. | $204k 100,000 shares | -20% | +35% from low-71% from high | |
| 37Weak | NET Power Inc. | $177k 86,483 shares | -15% | +31% from low-74% from high | |
| 41Moderate | NET Power Inc. | $397k 188,517 shares | -24% | +45% from low-73% from high | |
| 40Moderate | NET Power Inc. | $369k 175,000 shares | -18% | +42% from low-74% from high | |
| 43Moderate | NET Power Inc. | $509k 250,000 shares | -21% | +35% from low-76% from high | |
| 31Weak | NET Power Inc. | $129k 54,780 shares | -4% | +60% from low-72% from high | |
| 46Moderate | NET Power Inc. | $700k 295,220 shares | -19% | +57% from low-73% from high | |
| 50Moderate | NET Power Inc. | $1.3M 500,000 shares | -24% | +83% from low-73% from high | |
| 36Weak | NET Power Inc. | $376k 170,000 shares | -8% | +48% from low-80% from high | |
| 46Moderate | NET Power Inc. | $742k 330,000 shares | -13% | +55% from low-79% from high | |
| 30Weak | NET Power Inc. | $113k 40,000 shares | -2% | +86% from low-75% from high | |
| 48Moderate | NET Power Inc. | $890k 310,000 shares | -11% | +95% from low-74% from high | |
| 39Weak | NET Power Inc. | $587k 200,000 shares | -6% | +93% from low-77% from high | |
| 36Weak | NET Power Inc. | $388k 150,000 shares | -5% | +63% from low-82% from high | |
| 50Moderate | NET Power Inc. | $1.6M 588,653 shares | -15% | +85% from low-79% from high | |
| 37Weak | NET Power Inc. | $107k 26,593 shares | -1% | +155% from low-71% from high | |
| 62Notable | NET Power Inc. | $3.7M 902,171 shares | -33% | +130% from low-74% from high | |
| 57Moderate | NET Power Inc. | $1.9M 516,683 shares | -16% | +139% from low-73% from high | |
| 57Moderate | NET Power Inc. | $1.7M 479,300 shares | -13% | +135% from low-74% from high | |
| 45Moderate | NET Power Inc. | $1.1M 236,600 shares | -6% | +223% from low-64% from high | |
| 72Notable | NET Power Inc. | $5.5M 431,009 shares | -100% | - | |
| 72Notable | NET Power Inc. | $11M 829,411 shares | -66% | - | |
| 65Notable | NET Power Inc. | $5.1M 716,987 shares | -100% | - | |
| 55Moderate | NET Power Inc. | $1.7M 243,091 shares | -25% | - |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Nov 19, 2024 | NPWR NET Power Inc. | 1,260,420 1.68% of outstanding | $11M | Nov 19, 2024 | $18M |
Transactions
The newest 50 of 87 rows this insider has filed.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 8, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -100,000 | $1.94 | $194k | 900,000 | 34 d ago |
| Sep 9, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -150,000 | $1.84 | $276k | 750,000 | 34 d ago |
| Aug 25, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -201,550 | $1.91 | $384k | 1,041,350 | Aug 27, 2026 |
| Aug 26, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -41,350 | $1.91 | $79k | 1,000,000 | Aug 27, 2026 |
| Aug 12, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -50,000 | $1.63 | $82k | 1,950,000 | Aug 14, 2026 |
| Aug 13, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -200,000 | $1.62 | $324k | 1,750,000 | Aug 14, 2026 |
| Aug 14, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -507,100 | $1.95 | $991k | 1,242,900 | Aug 14, 2026 |
| Aug 7, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -60,345 | $1.53 | $92k | 2,090,400 | Aug 11, 2026 |
| Aug 10, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -55,400 | $1.55 | $86k | 2,035,000 | Aug 11, 2026 |
| Aug 11, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -35,000 | $1.60 | $56k | 2,000,000 | Aug 11, 2026 |
| Aug 4, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -120,000 | $1.54 | $185k | 2,380,000 | Aug 6, 2026 |
| Aug 5, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -140,000 | $1.51 | $211k | 2,240,000 | Aug 6, 2026 |
| Aug 6, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -89,255 | $1.51 | $134k | 2,150,745 | Aug 6, 2026 |
| Jul 28, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -55,858 | $1.47 | $82k | 2,700,000 | Jul 30, 2026 |
| Jul 29, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -45,000 | $1.41 | $63k | 2,655,000 | Jul 30, 2026 |
| Jul 30, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -155,000 | $1.43 | $221k | 2,500,000 | Jul 30, 2026 |
| Jul 21, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -80,000 | $1.53 | $122k | 2,885,000 | Jul 23, 2026 |
| Jul 22, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -90,000 | $1.53 | $137k | 2,795,000 | Jul 23, 2026 |
| Jul 23, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -39,142 | $1.51 | $59k | 2,755,858 | Jul 23, 2026 |
| May 12, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -400,000 | $2.44 | $976k | 3,000,000 | May 14, 2026 |
| May 13, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -35,000 | $2.43 | $85k | 2,965,000 | May 14, 2026 |
| Mar 6, 2026 | NPWR NET Power Inc. | CConversion Class A Common Stockindirect: By: NPEH, LLC | +3,000,000 | - | - | 3,400,000 | May 13, 2026 |
| Mar 6, 2026 | NPWR NET Power Inc. | JOther Class B Common Stockindirect: By: NPEH, LLC | -3,000,000 | - | - | 17,729,880 | May 13, 2026 |
| Mar 6, 2026 | NPWR NET Power Inc. | CConversion Class A Units of NET Power Operations LLCderivativeindirect: By: NPEH, LLC | -3,000,000 | - | - | 17,729,880 | May 13, 2026 |
| Mar 6, 2026 | NPWR NET Power Inc. | CConversion Class A Common Stockindirect: By: NPEH, LLC | +3,000,000 | - | - | 3,400,000 | Mar 10, 2026 |
| Mar 6, 2026 | NPWR NET Power Inc. | JOther Class B Common Stockindirect: By: NPEH, LLC | -3,000,000 | - | - | 17,729,880 | Mar 10, 2026 |
| Mar 3, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -100,000 | $2.04 | $204k | 400,000 | Mar 5, 2026 |
| Feb 26, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -1,881 | $2.00 | $3,762 | 584,602 | Mar 2, 2026 |
| Feb 27, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -4,744 | $2.00 | $9,489 | 579,858 | Mar 2, 2026 |
| Mar 2, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -79,858 | $2.05 | $164k | 500,000 | Mar 2, 2026 |
| Feb 19, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -125,000 | $2.14 | $268k | 650,000 | Feb 23, 2026 |
| Feb 20, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -63,517 | $2.03 | $129k | 586,483 | Feb 23, 2026 |
| Feb 13, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -100,000 | $2.14 | $214k | 850,000 | Feb 18, 2026 |
| Feb 18, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -75,000 | $2.07 | $155k | 775,000 | Feb 18, 2026 |
| Feb 10, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -40,000 | $2.08 | $83k | 1,160,000 | Feb 12, 2026 |
| Feb 11, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -60,000 | $2.02 | $121k | 1,100,000 | Feb 12, 2026 |
| Feb 12, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -150,000 | $2.03 | $305k | 950,000 | Feb 12, 2026 |
| Jan 29, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -54,780 | $2.35 | $129k | 1,200,000 | Feb 2, 2026 |
| Jan 26, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -130,000 | $2.35 | $306k | 1,420,000 | Jan 28, 2026 |
| Jan 27, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -100,000 | $2.38 | $238k | 1,320,000 | Jan 28, 2026 |
| Jan 28, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -65,220 | $2.38 | $155k | 1,254,780 | Jan 28, 2026 |
| Jan 14, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -135,000 | $2.74 | $370k | 1,915,000 | Jan 16, 2026 |
| Jan 15, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -135,000 | $2.57 | $347k | 1,780,000 | Jan 16, 2026 |
| Jan 16, 2026 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -230,000 | $2.63 | $605k | 1,550,000 | Jan 16, 2026 |
| Dec 24, 2025 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -170,000 | $2.21 | $376k | 2,050,000 | Dec 29, 2025 |
| Dec 19, 2025 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -100,000 | $2.34 | $234k | 2,450,000 | Dec 23, 2025 |
| Dec 22, 2025 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -100,000 | $2.26 | $226k | 2,350,000 | Dec 23, 2025 |
| Dec 23, 2025 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -130,000 | $2.17 | $282k | 2,220,000 | Dec 23, 2025 |
| Dec 9, 2025 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -40,000 | $2.82 | $113k | 2,550,000 | Dec 11, 2025 |
| Dec 4, 2025 | NPWR NET Power Inc. | SOpen-market sale Class A Common Stockindirect: By: NPEH, LLC | -65,000 | $2.94 | $191k | 2,835,000 | Dec 8, 2025 |
50 of 87 rows shown.
Questions about 8 Rivers Capital, LLC
Answered from the filings on this page, as of the latest one.
Is 8 Rivers Capital, LLC buying or selling?
In the last 12 months 8 Rivers Capital, LLC reported 0 open-market buys worth $0 and 28 open-market sells worth $22M on SEC Form 4; the latest was sold $470k of NPWR on Sep 8, 2026. Grants, option exercises and tax withholding are not counted.
How did 8 Rivers Capital, LLC's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and 8 Rivers Capital, LLC has 0.
Where does 8 Rivers Capital, LLC file Form 4?
8 Rivers Capital, LLC has filed Form 4 at NPWR (NET Power Inc.). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.