STOCK TITAN

[Form 4] NET Power Inc. Insider Trading Activity

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
4
Rhea-AI Filing Summary

Form 4 filing dated 31 Jul 2025 shows a complete exit by 10% owner SK Inc. from its indirect stake in NET Power Inc. (NPWR). On 30 Jul 2025 the reporting entity effected a Transaction Code “J” (other transfer) that removed ownership of 26,729,880 Class B common shares and an identical number of Class A units of NET Power Operations LLC.

The disposition occurred when SK Inc. sold 100% of its interests in three subsidiaries—Tillandsia, Areca and Chamaedorea— which collectively control approximately 68.5% of the voting units of 8 Rivers Capital, the manager that owns about 91.4% of NPEH, the direct holder of the NPWR securities. Following the transaction, SK Inc. reports zero derivative or non-derivative NPWR securities; beneficial ownership has shifted to the purchaser of the subsidiary stakes.

No price is listed, implying a non-market, privately negotiated transfer. The removal of a 26.7 million-share block — roughly a low-teens percentage of NPWR’s equity base — eliminates a major insider but may introduce supply-overhang risk if the new owner elects to monetize the position.

La dichiarazione Form 4 del 31 luglio 2025 mostra l'uscita completa del proprietario del 10%, SK Inc., dalla sua partecipazione indiretta in NET Power Inc. (NPWR). Il 30 luglio 2025 l'entità segnalante ha effettuato una Transazione Codice “J” (altro trasferimento) che ha rimosso la proprietà di 26.729.880 azioni ordinarie di Classe B e un numero identico di unità di Classe A di NET Power Operations LLC.

La cessione è avvenuta quando SK Inc. ha venduto il 100% delle sue partecipazioni in tre controllate — Tillandsia, Areca e Chamaedorea — che complessivamente controllano circa il 68,5% delle unità di voto di 8 Rivers Capital, il gestore che possiede circa il 91,4% di NPEH, il detentore diretto dei titoli NPWR. Dopo la transazione, SK Inc. dichiara di non possedere più titoli NPWR, né derivati né non derivati; la proprietà effettiva è passata all'acquirente delle partecipazioni nelle controllate.

Non è indicato alcun prezzo, il che suggerisce un trasferimento privato e non di mercato. La rimozione di un blocco di 26,7 milioni di azioni — circa una percentuale bassa a due cifre della base azionaria di NPWR — elimina un importante insider, ma potrebbe introdurre un rischio di eccesso di offerta se il nuovo proprietario decidesse di monetizzare la posizione.

La presentación del Formulario 4 con fecha 31 de julio de 2025 muestra la salida completa del propietario del 10%, SK Inc., de su participación indirecta en NET Power Inc. (NPWR). El 30 de julio de 2025, la entidad informante realizó una Transacción Código “J” (otra transferencia) que eliminó la propiedad de 26,729,880 acciones ordinarias Clase B y un número idéntico de unidades Clase A de NET Power Operations LLC.

La disposición ocurrió cuando SK Inc. vendió el 100% de sus intereses en tres subsidiarias — Tillandsia, Areca y Chamaedorea — que colectivamente controlan aproximadamente el 68.5% de las unidades con derecho a voto de 8 Rivers Capital, el administrador que posee cerca del 91.4% de NPEH, el titular directo de los valores de NPWR. Tras la transacción, SK Inc. reporta cero valores NPWR, ni derivados ni no derivados; la propiedad beneficiaria ha pasado al comprador de las participaciones en las subsidiarias.

No se indica precio, lo que implica una transferencia privada y no de mercado. La eliminación de un bloque de 26.7 millones de acciones — aproximadamente un porcentaje bajo de dos dígitos de la base accionaria de NPWR — elimina a un importante insider, pero podría introducir un riesgo de exceso de oferta si el nuevo propietario decide monetizar la posición.

2025년 7월 31일자 Form 4 제출서류에 따르면 10% 지분 보유자인 SK Inc.가 NET Power Inc. (NPWR)에 대한 간접 지분을 완전히 처분하였습니다. 2025년 7월 30일, 보고 주체는 거래 코드 “J”(기타 이전)를 통해 26,729,880주 클래스 B 보통주와 동일 수량의 NET Power Operations LLC 클래스 A 단위를 소유권에서 제외하였습니다.

이번 처분은 SK Inc.가 세 개 자회사인 Tillandsia, Areca, Chamaedorea에 대한 지분 100%를 매각하면서 이루어졌으며, 이들 자회사는 합쳐서 8 Rivers Capital의 의결권 단위 약 68.5%를 통제하고 있습니다. 8 Rivers Capital은 NPWR 증권의 직접 보유자인 NPEH의 약 91.4%를 소유하는 매니저입니다. 거래 후 SK Inc.는 NPWR 증권(파생상품 포함)을 전혀 보유하지 않음을 보고했으며, 실질적 소유권은 자회사 지분 매수자에게 이전되었습니다.

가격은 명시되어 있지 않아 비시장성의 사적 협상 이전임을 시사합니다. 약 2,670만 주 규모의 지분 블록 제거는 NPWR 지분 기반의 약 두 자릿수 초반 비율에 해당하며, 주요 내부자가 사라지게 되지만 신규 소유자가 해당 지분을 현금화할 경우 공급 과잉 위험이 발생할 수 있습니다.

Le dépôt du formulaire 4 daté du 31 juillet 2025 montre une sortie complète du propriétaire à 10%, SK Inc., de sa participation indirecte dans NET Power Inc. (NPWR). Le 30 juillet 2025, l’entité déclarante a effectué une Transaction Code « J » (autre transfert) qui a supprimé la propriété de 26 729 880 actions ordinaires de Classe B ainsi qu’un nombre identique d’unités de Classe A de NET Power Operations LLC.

La cession a eu lieu lorsque SK Inc. a vendu 100 % de ses intérêts dans trois filiales — Tillandsia, Areca et Chamaedorea — qui contrôlent collectivement environ 68,5 % des unités de vote de 8 Rivers Capital, le gestionnaire qui détient environ 91,4 % de NPEH, le détenteur direct des titres NPWR. Suite à la transaction, SK Inc. déclare ne plus détenir aucun titre NPWR, dérivé ou non dérivé ; la propriété bénéficiaire est passée à l’acheteur des participations dans les filiales.

Aucun prix n’est indiqué, ce qui laisse supposer un transfert privé, négocié en dehors du marché. Le retrait d’un bloc de 26,7 millions d’actions — soit environ un pourcentage bas à deux chiffres de la base des capitaux propres de NPWR — élimine un initié majeur mais pourrait introduire un risque de surabondance d’offre si le nouveau propriétaire choisit de monétiser la position.

Die Form 4-Meldung vom 31. Juli 2025 zeigt den vollständigen Ausstieg des 10%-Eigentümers SK Inc. aus seiner indirekten Beteiligung an NET Power Inc. (NPWR). Am 30. Juli 2025 führte die meldende Einheit eine Transaktion mit Code „J“ (sonstige Übertragung) durch, die den Besitz von 26.729.880 Class-B-Stammaktien sowie der gleichen Anzahl von Class-A-Einheiten der NET Power Operations LLC entfernte.

Die Veräußerung erfolgte, als SK Inc. 100 % seiner Anteile an drei Tochtergesellschaften – Tillandsia, Areca und Chamaedorea – verkaufte, die zusammen etwa 68,5 % der Stimmrechte an 8 Rivers Capital kontrollieren. 8 Rivers Capital ist der Manager, der etwa 91,4 % von NPEH hält, dem direkten Inhaber der NPWR-Wertpapiere. Nach der Transaktion meldet SK Inc., keine derivativen oder nicht derivativen NPWR-Wertpapiere mehr zu besitzen; das wirtschaftliche Eigentum ging auf den Käufer der Tochtergesellschaftsanteile über.

Es ist kein Preis angegeben, was auf eine nicht marktübliche, privat ausgehandelte Übertragung hindeutet. Die Entfernung eines Blocks von 26,7 Millionen Aktien – etwa ein niedriger zweistelliger Prozentsatz der NPWR-Eigenkapitalbasis – beseitigt einen bedeutenden Insider, könnte jedoch ein Risiko eines Überangebots darstellen, falls der neue Eigentümer die Position monetarisieren möchte.

Positive
  • None.
Negative
  • 26.7 million shares disposed by 10% owner: large insider exit can pressure sentiment and raise liquidity overhang concerns.
  • Loss of strategic partner: SK Inc. had been a significant backer; its departure may signal reduced strategic alignment or confidence.

Insights

TL;DR: 10% holder SK Inc. exits 26.7 m-share stake; potential sentiment headwind.

The filing confirms that SK Inc. no longer holds any Class B common stock or corresponding LLC units after divesting its indirect interest via a subsidiary sale. A block of 26.7 million exchangeable shares—likely >10% of float—has shifted to an unidentified buyer. While no cash price is disclosed, the loss of a strategic shareholder removes governance alignment and may foreshadow secondary liquidity if the new owner is financially, not strategically, motivated. This is typically viewed as bearish near-term, though it does cleanse cap-table complexity tied to SK’s layered ownership. Impact: material; watch for future Schedule 13D/G by the acquirer.

La dichiarazione Form 4 del 31 luglio 2025 mostra l'uscita completa del proprietario del 10%, SK Inc., dalla sua partecipazione indiretta in NET Power Inc. (NPWR). Il 30 luglio 2025 l'entità segnalante ha effettuato una Transazione Codice “J” (altro trasferimento) che ha rimosso la proprietà di 26.729.880 azioni ordinarie di Classe B e un numero identico di unità di Classe A di NET Power Operations LLC.

La cessione è avvenuta quando SK Inc. ha venduto il 100% delle sue partecipazioni in tre controllate — Tillandsia, Areca e Chamaedorea — che complessivamente controllano circa il 68,5% delle unità di voto di 8 Rivers Capital, il gestore che possiede circa il 91,4% di NPEH, il detentore diretto dei titoli NPWR. Dopo la transazione, SK Inc. dichiara di non possedere più titoli NPWR, né derivati né non derivati; la proprietà effettiva è passata all'acquirente delle partecipazioni nelle controllate.

Non è indicato alcun prezzo, il che suggerisce un trasferimento privato e non di mercato. La rimozione di un blocco di 26,7 milioni di azioni — circa una percentuale bassa a due cifre della base azionaria di NPWR — elimina un importante insider, ma potrebbe introdurre un rischio di eccesso di offerta se il nuovo proprietario decidesse di monetizzare la posizione.

La presentación del Formulario 4 con fecha 31 de julio de 2025 muestra la salida completa del propietario del 10%, SK Inc., de su participación indirecta en NET Power Inc. (NPWR). El 30 de julio de 2025, la entidad informante realizó una Transacción Código “J” (otra transferencia) que eliminó la propiedad de 26,729,880 acciones ordinarias Clase B y un número idéntico de unidades Clase A de NET Power Operations LLC.

La disposición ocurrió cuando SK Inc. vendió el 100% de sus intereses en tres subsidiarias — Tillandsia, Areca y Chamaedorea — que colectivamente controlan aproximadamente el 68.5% de las unidades con derecho a voto de 8 Rivers Capital, el administrador que posee cerca del 91.4% de NPEH, el titular directo de los valores de NPWR. Tras la transacción, SK Inc. reporta cero valores NPWR, ni derivados ni no derivados; la propiedad beneficiaria ha pasado al comprador de las participaciones en las subsidiarias.

No se indica precio, lo que implica una transferencia privada y no de mercado. La eliminación de un bloque de 26.7 millones de acciones — aproximadamente un porcentaje bajo de dos dígitos de la base accionaria de NPWR — elimina a un importante insider, pero podría introducir un riesgo de exceso de oferta si el nuevo propietario decide monetizar la posición.

2025년 7월 31일자 Form 4 제출서류에 따르면 10% 지분 보유자인 SK Inc.가 NET Power Inc. (NPWR)에 대한 간접 지분을 완전히 처분하였습니다. 2025년 7월 30일, 보고 주체는 거래 코드 “J”(기타 이전)를 통해 26,729,880주 클래스 B 보통주와 동일 수량의 NET Power Operations LLC 클래스 A 단위를 소유권에서 제외하였습니다.

이번 처분은 SK Inc.가 세 개 자회사인 Tillandsia, Areca, Chamaedorea에 대한 지분 100%를 매각하면서 이루어졌으며, 이들 자회사는 합쳐서 8 Rivers Capital의 의결권 단위 약 68.5%를 통제하고 있습니다. 8 Rivers Capital은 NPWR 증권의 직접 보유자인 NPEH의 약 91.4%를 소유하는 매니저입니다. 거래 후 SK Inc.는 NPWR 증권(파생상품 포함)을 전혀 보유하지 않음을 보고했으며, 실질적 소유권은 자회사 지분 매수자에게 이전되었습니다.

가격은 명시되어 있지 않아 비시장성의 사적 협상 이전임을 시사합니다. 약 2,670만 주 규모의 지분 블록 제거는 NPWR 지분 기반의 약 두 자릿수 초반 비율에 해당하며, 주요 내부자가 사라지게 되지만 신규 소유자가 해당 지분을 현금화할 경우 공급 과잉 위험이 발생할 수 있습니다.

Le dépôt du formulaire 4 daté du 31 juillet 2025 montre une sortie complète du propriétaire à 10%, SK Inc., de sa participation indirecte dans NET Power Inc. (NPWR). Le 30 juillet 2025, l’entité déclarante a effectué une Transaction Code « J » (autre transfert) qui a supprimé la propriété de 26 729 880 actions ordinaires de Classe B ainsi qu’un nombre identique d’unités de Classe A de NET Power Operations LLC.

La cession a eu lieu lorsque SK Inc. a vendu 100 % de ses intérêts dans trois filiales — Tillandsia, Areca et Chamaedorea — qui contrôlent collectivement environ 68,5 % des unités de vote de 8 Rivers Capital, le gestionnaire qui détient environ 91,4 % de NPEH, le détenteur direct des titres NPWR. Suite à la transaction, SK Inc. déclare ne plus détenir aucun titre NPWR, dérivé ou non dérivé ; la propriété bénéficiaire est passée à l’acheteur des participations dans les filiales.

Aucun prix n’est indiqué, ce qui laisse supposer un transfert privé, négocié en dehors du marché. Le retrait d’un bloc de 26,7 millions d’actions — soit environ un pourcentage bas à deux chiffres de la base des capitaux propres de NPWR — élimine un initié majeur mais pourrait introduire un risque de surabondance d’offre si le nouveau propriétaire choisit de monétiser la position.

Die Form 4-Meldung vom 31. Juli 2025 zeigt den vollständigen Ausstieg des 10%-Eigentümers SK Inc. aus seiner indirekten Beteiligung an NET Power Inc. (NPWR). Am 30. Juli 2025 führte die meldende Einheit eine Transaktion mit Code „J“ (sonstige Übertragung) durch, die den Besitz von 26.729.880 Class-B-Stammaktien sowie der gleichen Anzahl von Class-A-Einheiten der NET Power Operations LLC entfernte.

Die Veräußerung erfolgte, als SK Inc. 100 % seiner Anteile an drei Tochtergesellschaften – Tillandsia, Areca und Chamaedorea – verkaufte, die zusammen etwa 68,5 % der Stimmrechte an 8 Rivers Capital kontrollieren. 8 Rivers Capital ist der Manager, der etwa 91,4 % von NPEH hält, dem direkten Inhaber der NPWR-Wertpapiere. Nach der Transaktion meldet SK Inc., keine derivativen oder nicht derivativen NPWR-Wertpapiere mehr zu besitzen; das wirtschaftliche Eigentum ging auf den Käufer der Tochtergesellschaftsanteile über.

Es ist kein Preis angegeben, was auf eine nicht marktübliche, privat ausgehandelte Übertragung hindeutet. Die Entfernung eines Blocks von 26,7 Millionen Aktien – etwa ein niedriger zweistelliger Prozentsatz der NPWR-Eigenkapitalbasis – beseitigt einen bedeutenden Insider, könnte jedoch ein Risiko eines Überangebots darstellen, falls der neue Eigentümer die Position monetarisieren möchte.

SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
X
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
SK INC.

(Last) (First) (Middle)
26, JONG-RO, JONGNO-GU

(Street)
SEOUL M5 03188

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
NET Power Inc. [ NPWR ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
07/30/2025
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Class B Common Stock 07/30/2025 J(1) 26,729,880 D (1) 0 I See Footnotes(1)(2)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Class A Units of NET Power Operations LLC (2) 07/30/2025 J(1) 26,729,880 (2) (2) Class A Common Stock 26,729,880 (1) 0 I See Footnotes(1)(2)
Explanation of Responses:
1. The securities reported in this Form 4 are directly held by NPEH, LLC ("NPEH"), a limited liability company of which the Reporting Person was the indirect majority owner. On July 30, 2025, the Reporting Person sold 100% of the equity interests of each of Tillandsia, Inc. ("Tillandsia"), Areca, Inc. ("Areca") and Chamaedorea, Inc. ("Chamaedoria"). Tillandsia, Areca and Chamaedorea own approximately 18.6%, 25.77% and 24.11%, respectively, of the voting units of 8 Rivers Capital, LLC ("8 Rivers"). 8 Rivers is the manager and owns approximately 91.4% of NPEH.
2. For each Class A Unit of Net Power Operations LLC, NPEH owns one corresponding share of Class B Common Stock of the Issuer. The Class A Units of NET Power Operations LLC are exchangeable (together with the cancellation of a corresponding number of shares of the Issuer's Class B Common Stock) into shares of the Issuer's Class A Common Stock on a one-for-one basis or, at the Issuer's election, cash, and have no expiration date.
/s/ Munhyuk Jang, Head of Corporate Management Department of SK Inc. 07/31/2025
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

How many NPWR shares did SK Inc. dispose of?

The filing shows 26,729,880 Class B shares (and the same number of LLC units) were removed from SK Inc.’s beneficial ownership.

Does SK Inc. still hold any NET Power stock after this Form 4?

No. Column 5 indicates zero securities owned following the transaction; SK Inc. is no longer an NPWR shareholder.

What triggered the disposition reported in the Form 4?

SK Inc. sold 100% of its equity in three subsidiaries that indirectly controlled NPEH, the vehicle holding the NPWR securities.

Was this a market sale or private transfer?

Transaction Code “J” and the absence of a price suggest a non-market, private transfer, likely part of the subsidiary sale.

Could the new owner sell these shares into the market?

Yes. The 26.7 m shares are exchangeable into Class A common stock on a 1-for-1 basis, so the new holder could seek liquidity.
NET POWER INC

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236.29M
70.33M
12.78%
86.54%
4.38%
Specialty Industrial Machinery
Electrical Industrial Apparatus
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