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Insider · CIK 0001079818

William Gross

directorownerceoofficer

Files at NRGV (Energy Vault Holdings, Inc.), HLGN (Heliogen, Inc.). First filing Oct 12, 2022, latest Feb 20, 2024.

In brief

William Gross files SEC Form 4 as director, 10% owner and CEO at NRGV (Energy Vault Holdings, Inc.), and also at HLGN (Heliogen, Inc.). Since Oct 12, 2022, William Gross has reported 1 open-market buy worth $50k and 4 open-market sells worth $1.3M, the latest filed on Feb 20, 2024.

A track record needs three past buys with six months of prices behind them; William Gross has 0, so none is measured yet.

The newest scored trade: sold $672k of HLGN on Feb 15, 2024, filed Feb 20, 2024, scored 52 (moderate).

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
1 / 4
$50k bought, $1.3M 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.

NRGV: Energy Vault Holdings, Inc.

NRGVOct 12, 2026 · close 3.11

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.

ScoreCompanyValueHoldingsPrice contextFiled
52Moderate
HLGNsell
Heliogen, Inc.
$672k
442,298 shares
-100%-
32Weak
HLGNbuy
Heliogen, Inc.
$50k
50,000 shares
+3%-
5Weak
NRGVsell10b5-1
Energy Vault Holdings, Inc.
$120k
32,500 shares
-2%0% from low-83% from high
10Weak
NRGVsell10b5-1
Energy Vault Holdings, Inc.
$337k
80,000 shares
-2%+2% from low-81% from high
7Weak
NRGVsell10b5-1
Energy Vault Holdings, Inc.
$176k
32,500 shares
-2%+38% from low-74% from high

Transactions

Every row this insider has filed, 11 in all, newest first.

DateCompanyTransactionSharesPriceValueHoldings afterFiled
May 24, 2024NRGV
Energy Vault Holdings, Inc.
AGrant or award
Common Stock
+68,989$0.00$0154,740May 29, 2024
Mar 13, 2024NRGV
Energy Vault Holdings, Inc.
JOther
Common Stockindirect: Held by Idealab Holdings, LLC
+130,000$1.65$215k1,406,355Mar 15, 2024
Feb 15, 2024HLGN
Heliogen, Inc.
SOpen-market sale
Common Stock
-442,298$1.52$672k0Feb 20, 2024
Dec 18, 2023NRGV
Energy Vault Holdings, Inc.
GGift
Common Stockindirect: Held by Gross Goodstein Living Trust dated April 18, 2006
-100,000$0.00$04,511,086Dec 20, 2023
Dec 30, 2022NRGV
Energy Vault Holdings, Inc.
GGift
Common Stockindirect: Held by Gross Goodstein Living Trust dated April 18, 2006
-211,864$0.00$04,611,086Dec 30, 2022
Nov 18, 2022HLGN
Heliogen, Inc.
POpen-market purchase
Common Stock
+50,000$1.00$50k1,672,612Nov 22, 2022
Oct 24, 2022NRGV
Energy Vault Holdings, Inc.
SOpen-market sale
Common Stockindirect: Held by Idealab Studio, LLC10b5-1
-16,250$3.61$59k1,607,247Oct 26, 2022
Oct 25, 2022NRGV
Energy Vault Holdings, Inc.
SOpen-market sale
Common Stockindirect: Held by Idealab Studio, LLC10b5-1
-16,250$3.78$61k1,590,997Oct 26, 2022
Oct 20, 2022NRGV
Energy Vault Holdings, Inc.
SOpen-market sale
Common Stockindirect: Held by Gross Goodstein Living Trust dated April 18, 200610b5-1
-80,000$4.22$337k4,822,950Oct 24, 2022
Oct 10, 2022NRGV
Energy Vault Holdings, Inc.
SOpen-market sale
Common Stockindirect: Held by Idealab Studio, LLC10b5-1
-16,250$5.46$89k1,639,747Oct 12, 2022
Oct 11, 2022NRGV
Energy Vault Holdings, Inc.
SOpen-market sale
Common Stockindirect: Held by Idealab Studio, LLC10b5-1
-16,250$5.34$87k1,623,497Oct 12, 2022

Questions about William Gross

Answered from the filings on this page, as of the latest one.

Is William Gross buying or selling?

Not in the last 12 months. William Gross's latest open-market trade on SEC Form 4 was sold $672k of HLGN on Feb 15, 2024.

How did William Gross's past buys perform?

Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and William Gross has 0.

Where does William Gross file Form 4?

William Gross has filed Form 4 at NRGV (Energy Vault Holdings, Inc.); HLGN (Heliogen, Inc.) as CHIEF EXECUTIVE OFFICER. 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.

William Gross: insider trades and track record | InsiderTell