Comparable stake leader
SK INC.
SEC ownership of Net Power Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001845437.
Disclosed value leader
SK INC.
Comparable rows
50/50
Latest evidence
13 Aug 2026
- Public ticker
- NPWR, NPWR-WT on NYSE
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
SK INC.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
SK INC.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
13 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001845437
- Issuer location
- Houston, TX
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Net Power Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
SK INC.
Disclosed value leader
SK INC.
Comparable rows
50/50
Latest evidence
13 Aug 2026
13D/G
3/4/5
13F
Lead comparable stake: 26%
13D/G row: SK INC.
Showing 1-8 of 50 holder rows.
Quick read
SK INC. leads the comparable SEC ownership view at 26%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens SK INC.'s linked filing trail.
Comparable ownership
Top 5
SK INC.
26%
8 Rivers Capital, LLC
18%
Andrew L. Share
9.2%
HITE Hedge Asset Management LLC
2.7%
ADAGE CAPITAL PARTNERS GP, L.L.C.
2.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| SK INC. |
13D/G
8 RIVERS CAPITAL, LLC
|
26%
|
$88,475,903
26,729,880 shares
|
$0 | 30 Jul 2025 |
| 8 Rivers Capital, LLC |
13D/G
3/4/5
10%+ Owner
|
18%
|
$31,684,543
18,972,780 shares
|
-$2,875,907 | 13 Aug 2026 |
| Andrew L. Share |
13F
Individual
|
9.2%
|
$16,311,725
9,767,500 shares
|
— | 30 Jun 2026 |
| HITE Hedge Asset Management LLC |
13F
Company
|
2.7%
|
$4,763,959
2,852,670 shares
|
— | 30 Jun 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. |
13F
Company
|
2.7%
|
$4,742,800
2,840,000 shares
|
— | 30 Jun 2026 |
| BlackRock, Inc. |
13F
Company
|
2.3%
|
$4,035,211
2,416,294 shares
|
— | 30 Jun 2026 |
| PEAK6 LLC |
13F
Company
|
1.9%
|
$3,316,209
1,985,754 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
1.7%
|
$3,009,961
1,802,372 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$45,911,034.
Buys
$0
Insiders: 0
Sells
$45,911,034
Insiders: 4
Net
-$45,911,034
Shares: -17,689,416
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 17,689,416
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 5,166,300 | $0 | $8,539,052 | -$8,539,052 |
| 3-6 | 0 | 1,674,204 | $0 | $3,937,159 | -$3,937,159 |
| 6-9 | 0 | 5,030,796 | $0 | $12,275,544 | -$12,275,544 |
| 9-12 | 0 | 5,818,116 | $0 | $21,159,280 | -$21,159,280 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 30 reporting-owner rows connected to Net Power Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
30
Largest Forms 3/4/5 holder
Kyle Derham
Net 12M change
-$45,911,035
Latest report
12 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Kyle Derham | Director | $13,217,341 | Mixed | 16 Aug 2023 | ||
| Akash S. Patel | Chief Financial Officer | $10,073,392 | Mixed | 02 Apr 2025 | ||
| CONSTELLATION ENERGY GENERATION LLC | 10%+ Owner | $7,559,050 | Mixed | 08 Jun 2023 | ||
| Brock Forrest | Chief Technology Officer | $4,705,556 | Mixed | 08 Jun 2023 | ||
| James Mahon | General Counsel and Secretary | $4,674,899 | Mixed | 12 Sep 2023 | ||
| 8 Rivers Capital, LLC | 10%+ Owner | $2,427,756 | -$20,965,277 | -90% | Filing P/S | 12 Aug 2026 |
| NPEH, LLC | 10%+ Owner | $2,427,756 | -$20,965,277 | -90% | Filing P/S | 12 Aug 2026 |
| Damian R. Beauchamp | 10%+ Owner | $2,427,756 | -$3,907,062 | -62% | Filing P/S | 12 Aug 2026 |
| Brian F. Allen | COO and President | $2,169,145 | Mixed | 02 Apr 2025 | ||
| Kelliher Joseph T. | Director | $67,605 | Mixed | 03 Jun 2025 | ||
| Daniel J. Rice IV | Chief Executive Officer, Director, 10%+ Owner | $38,583 | Mixed | 08 Jun 2023 | ||
| Kelly Rosser | Chief Accounting Officer | $5,684 | Filing P/S | 02 Apr 2025 | ||
| Marc Horstman | Chief Operating Officer | $3,560 | Mixed | 02 Jun 2025 | ||
| Cynda Beauchamp | 10%+ Owner | $0 | -$73,419 | -100% | Mixed | 31 Oct 2025 |
| SK INC. | 10%+ Owner | $0 | Mixed | 30 Jul 2025 | ||
| Rice Acquisition Sponsor II LLC | Former Director and 10% owner | Mixed | 30 Jun 2023 | |||
| Jide Famuagun | Director | Mixed | 08 Jun 2023 | |||
| Brad Pollack | Director | Mixed | 08 Jun 2023 | |||
| Alejandra Veltmann | Director | Mixed | 03 Jun 2025 | |||
| Carrie M. Fox | Director | Mixed | 08 Jun 2023 |
Recent insider transactions for Net Power Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -29% | $990,518 | $1.95 | -507,100 | 1,242,900 | 14 Aug 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -29% | $990,518 | $1.95 | -507,100 | 1,242,900 | 14 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -29% | $990,518 | $1.95 | -507,100 | 1,242,900 | 14 Aug 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -10.3% | $323,840 | $1.62 | -200,000 | 1,750,000 | 13 Aug 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -10.3% | $323,840 | $1.62 | -200,000 | 1,750,000 | 13 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -10.3% | $323,840 | $1.62 | -200,000 | 1,750,000 | 13 Aug 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -2.5% | $81,575 | $1.63 | -50,000 | 1,950,000 | 12 Aug 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.5% | $81,575 | $1.63 | -50,000 | 1,950,000 | 12 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.5% | $81,575 | $1.63 | -50,000 | 1,950,000 | 12 Aug 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -1.72% | $55,990 | $1.60 | -35,000 | 2,000,000 | 11 Aug 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -1.72% | $55,990 | $1.60 | -35,000 | 2,000,000 | 11 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -1.72% | $55,990 | $1.60 | -35,000 | 2,000,000 | 11 Aug 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -2.65% | $86,075 | $1.55 | -55,400 | 2,035,000 | 10 Aug 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.65% | $86,075 | $1.55 | -55,400 | 2,035,000 | 10 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.65% | $86,075 | $1.55 | -55,400 | 2,035,000 | 10 Aug 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -2.81% | $92,080 | $1.53 | -60,345 | 2,090,400 | 07 Aug 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.81% | $92,080 | $1.53 | -60,345 | 2,090,400 | 07 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.81% | $92,080 | $1.53 | -60,345 | 2,090,400 | 07 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -3.98% | $134,436 | $1.51 | -89,255 | 2,150,745 | 06 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -3.98% | $134,436 | $1.51 | -89,255 | 2,150,745 | 06 Aug 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -3.98% | $134,436 | $1.51 | -89,255 | 2,150,745 | 06 Aug 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -5.88% | $211,456 | $1.51 | -140,000 | 2,240,000 | 05 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -5.88% | $211,456 | $1.51 | -140,000 | 2,240,000 | 05 Aug 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -5.88% | $211,456 | $1.51 | -140,000 | 2,240,000 | 05 Aug 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -4.8% | $184,728 | $1.54 | -120,000 | 2,380,000 | 04 Aug 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -4.8% | $184,728 | $1.54 | -120,000 | 2,380,000 | 04 Aug 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -4.8% | $184,728 | $1.54 | -120,000 | 2,380,000 | 04 Aug 2026 | Direct |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -5.84% | $221,402 | $1.43 | -155,000 | 2,500,000 | 30 Jul 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -5.84% | $221,402 | $1.43 | -155,000 | 2,500,000 | 30 Jul 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -5.84% | $221,402 | $1.43 | -155,000 | 2,500,000 | 30 Jul 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -1.67% | $63,328 | $1.41 | -45,000 | 2,655,000 | 29 Jul 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -1.67% | $63,328 | $1.41 | -45,000 | 2,655,000 | 29 Jul 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -1.67% | $63,328 | $1.41 | -45,000 | 2,655,000 | 29 Jul 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -2.03% | $82,229 | $1.47 | -55,858 | 2,700,000 | 28 Jul 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.03% | $82,229 | $1.47 | -55,858 | 2,700,000 | 28 Jul 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.03% | $82,229 | $1.47 | -55,858 | 2,700,000 | 28 Jul 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -1.4% | $58,971 | $1.51 | -39,142 | 2,755,858 | 23 Jul 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -1.4% | $58,971 | $1.51 | -39,142 | 2,755,858 | 23 Jul 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -1.4% | $58,971 | $1.51 | -39,142 | 2,755,858 | 23 Jul 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -3.12% | $137,322 | $1.53 | -90,000 | 2,795,000 | 22 Jul 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -3.12% | $137,322 | $1.53 | -90,000 | 2,795,000 | 22 Jul 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -3.12% | $137,322 | $1.53 | -90,000 | 2,795,000 | 22 Jul 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.7% | $122,400 | $1.53 | -80,000 | 2,885,000 | 21 Jul 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -2.7% | $122,400 | $1.53 | -80,000 | 2,885,000 | 21 Jul 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -2.7% | $122,400 | $1.53 | -80,000 | 2,885,000 | 21 Jul 2026 | Direct |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -1.17% | $85,152 | $2.43 | -35,000 | 2,965,000 | 13 May 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -1.17% | $85,152 | $2.43 | -35,000 | 2,965,000 | 13 May 2026 | By: NPEH, LLC |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -1.17% | $85,152 | $2.43 | -35,000 | 2,965,000 | 13 May 2026 | By: NPEH, LLC |
| Npeh, Llc | NPWR | Class A Common Stock | Sale | -11.8% | $975,560 | $2.44 | -400,000 | 3,000,000 | 12 May 2026 | Direct |
| 8 Rivers Capital, LLC | NPWR | Class A Common Stock | Sale | -11.8% | $975,560 | $2.44 | -400,000 | 3,000,000 | 12 May 2026 | By: NPEH, LLC |
* marks a reported price that did not pass the local price check.