Energy Vault (NRGV) CEO adds 7,500 shares at $3.255 price

Rhea-AI Filing Summary

Energy Vault Holdings, Inc. Chief Executive Officer Robert Piconi reported an open-market purchase of 7,500 shares of common stock on February 26, 2026 at a price of $3.255 per share. This filing reflects a net increase in his directly held stake.

After the transaction, Piconi directly owns 20,090,637 common shares. He is also investment advisor to 2021 Delaware trusts that hold an additional 4,307,946 shares indirectly, as disclosed in the footnotes.

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

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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^*

Piconi Robert

(Last) (First) (Middle)

4165 EAST THOUSAND OAKS BLVD, SUITE 100

(Street)

WESTLAKE VILLAGE CA 91362

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Energy Vault Holdings, Inc. [ NRGV ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/26/2026

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
Common Stock	02/26/2026		P		7,500	A	$3.255(1)	20,090,637	D
Common Stock								4,307,946	I	See Footnote(2)
Common Stock								4,307,946	I	See Footnote(3)

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

Explanation of Responses:

1. The shares are purchased in one transaction at a price given in Column 4.

2. Held by Piconi 2021 Delaware Trust for which the Reporting Person serves as investment advisor.

3. Held by Piconi Family 2021 Delaware Trust for which the Reporting Person serves as investment advisor.

Remarks:

	/s/ Brad Eastman, Chief Legal Officer	02/26/2026
	** 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

What did NRGV CEO Robert Piconi report in this Form 4 filing?

Robert Piconi reported buying additional Energy Vault (NRGV) common shares. He executed an open-market purchase of 7,500 shares and updated his direct and indirect ownership positions, including large stakes held through 2021 Delaware trusts where he serves as investment advisor.

How many Energy Vault (NRGV) shares did Robert Piconi buy and at what price?

Robert Piconi bought 7,500 shares of Energy Vault common stock. The open-market purchase on February 26, 2026 was executed at a price of $3.255 per share, according to the transaction details disclosed in the Form 4 filing.

What are Robert Piconi’s direct Energy Vault shareholdings after this transaction?

After the reported purchase, Robert Piconi directly holds 20,090,637 shares of Energy Vault common stock. This figure reflects his ownership following the 7,500-share open-market acquisition disclosed for February 26, 2026 in the Form 4 filing.

What indirect Energy Vault (NRGV) holdings are associated with Robert Piconi?

The filing shows 4,307,946 shares of Energy Vault common stock held indirectly. These shares are held by the Piconi 2021 Delaware Trust and the Piconi Family 2021 Delaware Trust, where Robert Piconi serves as investment advisor, as described in the footnotes.

Does this Energy Vault Form 4 show any insider stock sales?

No insider stock sales are reported in this Form 4. The filing records a single open-market purchase of 7,500 shares by Robert Piconi and lists his direct and indirect holdings, with no transactions coded as sales or dispositions during the reported period.