Energy Vault (NRGV) CEO Piconi has 329,921 shares withheld for RSU taxes

Rhea-AI Filing Summary

Energy Vault Holdings, Inc. Chief Executive Officer Robert Piconi reported a tax-related share disposition tied to equity compensation. On the vesting of restricted stock units, 329,921 shares of common stock were withheld by the company at $3.30 per share to cover his tax liability. This was described as a tax-withholding mechanism and not a market sale, meaning the shares were not sold on an exchange. After this withholding, Piconi directly holds 16,591,673 shares of common stock, indicating he retains a large equity position in the company.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Piconi Robert

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	329,921	$3.30	$1.09M

Holdings After Transaction: Common Stock — 16,591,673 shares (Direct)

Footnotes (1)

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Key Figures

Tax-withheld shares: 329,921 shares Withholding price: $3.30 per share Post-transaction holdings: 16,591,673 shares +1 more

4 metrics

Tax-withheld shares 329,921 shares Shares withheld to satisfy tax liability on RSU vesting

Withholding price $3.30 per share Value per Energy Vault common share used for tax withholding

Post-transaction holdings 16,591,673 shares Common shares directly held by Robert Piconi after withholding

Transaction date 2026-03-31 Date of tax-withholding disposition related to RSU vesting

Key Terms

restricted stock units, tax-withholding disposition, Form 4, Chief Executive Officer, +1 more

5 terms

restricted stock units financial

"tax liability on vesting of restricted stock units. Not a market sale."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Chief Executive Officer financial

""officer_title": "Chief Executive Officer""

A chief executive officer (CEO) is the top leader of a company, responsible for making major decisions, setting goals, and guiding the organization’s overall direction. Think of the CEO as the captain of a ship, steering it toward success. Investors pay close attention to the CEO because their leadership and strategy can significantly influence the company's performance and future growth.

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 Insider Transactions: What Each Field Means →

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

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 CALIFORNIA 91362

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/31/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	03/31/2026		F		329,921(1)	D	$3.3	16,591,673	D

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. Represents shares withheld by the Issuer to satisfy the reporting person's tax liability on vesting of restricted stock units. Not a market sale.

Remarks:

	/s/ Amy Blakeway, Chief Legal Officer	04/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What did Energy Vault (NRGV) CEO Robert Piconi report in this Form 4?

Robert Piconi reported a tax-withholding disposition of Energy Vault common stock. The company withheld shares that were vesting from restricted stock units to cover his tax liability, rather than executing an open-market sale of shares.

How many Energy Vault (NRGV) shares were withheld for Robert Piconi’s taxes?

The company withheld 329,921 shares of Energy Vault common stock. These shares came from vesting restricted stock units and were used to satisfy the CEO’s tax obligation associated with the vesting event, according to the Form 4 disclosure.

At what price were the withheld Energy Vault (NRGV) shares valued?

The withheld shares were valued at $3.30 per share. This price was used to determine how many shares of Energy Vault common stock were needed to satisfy Robert Piconi’s tax liability on the vesting restricted stock units reported in the filing.

Is Robert Piconi’s Energy Vault (NRGV) tax-withholding transaction a market sale?

No, the filing states it is not a market sale. The shares were withheld by Energy Vault to cover taxes on vesting restricted stock units, rather than sold on a stock exchange, which makes it an administrative tax-withholding transaction.

How many Energy Vault (NRGV) shares does Robert Piconi hold after this transaction?

After the tax-withholding disposition, Robert Piconi directly holds 16,591,673 shares of Energy Vault common stock. This figure, reported in the Form 4, reflects his remaining direct ownership following the withholding of shares for tax obligations.

What does a tax-withholding disposition mean for Energy Vault (NRGV) shareholders?

A tax-withholding disposition means shares are used to pay taxes on equity awards, not sold in the market. For Energy Vault shareholders, this represents a routine administrative step related to executive compensation rather than a discretionary buy or sell decision.