The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
| Date | Insider | Role | Action | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jul 6, 2026 | Beer Michael Thomas | Chief Financial Officer | Option exercise(M) | 50K | — | $0 |
| Jul 6, 2026 | Beer Michael Thomas | Chief Financial Officer | Sell(S) | 65K | $4.08 | $265K |
| Jul 6, 2026 | Beer Michael Thomas | Chief Financial Officer | Option exercise(M) | 50K | $1.17 | $59K |
| Jun 30, 2026 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 53K | $4.71 | $248K |
| Jun 30, 2026 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 142K | $4.71 | $667K |
| Jun 30, 2026 | Beer Michael Thomas | Chief Financial Officer | Tax withholding(F) | 24K | $4.71 | $114K |
| Jun 25, 2026 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Grant(A) | 3.9M | — | $0 |
| May 29, 2026 | Hixon Dylan | Director | Grant(A) | 19K | — | $0 |
| May 29, 2026 | Unwin Stephanie | Director | Grant(A) | 19K | — | $0 |
| May 29, 2026 | Mandanas Mary Beth | Director | Grant(A) | 22K | — | $0 |
| May 29, 2026 | Fariello Theresa M | Director | Grant(A) | 19K | — | $0 |
| May 29, 2026 | Paulson Larry | Director | Grant(A) | 22K | — | $0 |
| May 29, 2026 | Ertel Thomas R | Director | Grant(A) | 22K | — | $0 |
| Apr 6, 2026 | Beer Michael Thomas | Chief Financial Officer | Option exercise(M) | 50K | — | $0 |
| Apr 6, 2026 | Beer Michael Thomas | Chief Financial Officer | Sell(S) | 65K | $3.18 | $207K |
| Apr 6, 2026 | Beer Michael Thomas | Chief Financial Officer | Option exercise(M) | 50K | $1.17 | $59K |
| Mar 31, 2026 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 330K | $3.30 | $1.1M |
| Mar 31, 2026 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 148K | $3.30 | $488K |
| Mar 31, 2026 | Beer Michael Thomas | Chief Financial Officer | Tax withholding(F) | 29K | $3.30 | $95K |
| Mar 31, 2026 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Buy(P) | 13K | $3.21 | $40K |
| Mar 25, 2026 | Mandanas Mary Beth | Director | Buy(P) | 5K | $3.65 | $18K |
| Mar 12, 2026 | Beer Michael Thomas | Chief Financial Officer | Grant(A) | 150K | — | $0 |
| Mar 12, 2026 | Ladwa Akshay | Chief Operations Officer | Grant(A) | 475K | — | $0 |
| Mar 5, 2026 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 69K | $3.00 | $206K |
| Mar 5, 2026 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 10K | $3.00 | $30K |
| Mar 4, 2026 | Ertel Thomas R | Director | Buy(P) | 5K | $3.37 | $18K |
| Mar 2, 2026 | Ladwa Akshay | Chief Operations Officer | Buy(P) | 4K | $3.09 | $12K |
| Feb 27, 2026 | Paulson Larry | Director | Buy(P) | 5K | $3.15 | $16K |
| Feb 26, 2026 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Buy(P) | 8K | $3.26 | $24K |
| Jan 30, 2026 | Beer Michael Thomas | Chief Financial Officer | Tax withholding(F) | 103K | $5.43 | $560K |
| Jan 30, 2026 | Beer Michael Thomas | Chief Financial Officer | Grant(A) | 200K | — | $0 |
| Jan 30, 2026 | Beer Michael Thomas | Chief Financial Officer | Tax withholding(F) | 77K | $4.61 | $355K |
| Jan 30, 2026 | Beer Michael Thomas | Chief Financial Officer | Grant(A) | 200K | — | $0 |
| Jan 22, 2026 | Wiese Christopher | President, Energy Vault Labs | Tax withholding(F) | 7K | $4.61 | $31K |
| Jan 22, 2026 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 16K | $4.61 | $72K |
| Jan 22, 2026 | Beer Michael Thomas | Chief Financial Officer | Tax withholding(F) | 16K | $4.61 | $72K |
| Jan 22, 2026 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 91K | $4.61 | $421K |
| Jan 15, 2026 | SB Investment Advisers (UK) Ltd | 10% Owner | Sell(S) | 3.0M | $5.65 | $16.9M |
| Dec 23, 2025 | Beer Michael Thomas | Chief Financial Officer | Sell(S) | 50K | $4.91 | $246K |
| Dec 12, 2025 | Wiese Christopher | President, Energy Vault Labs | Tax withholding(F) | 9K | $3.44 | $30K |
| Dec 11, 2025 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 22K | $3.44 | $74K |
| Dec 11, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 9K | $3.44 | $30K |
| Nov 14, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Buy(P) | 10K | $3.00 | $30K |
| Nov 13, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 3K | $3.54 | $9K |
| Nov 13, 2025 | Wiese Christopher | President, Energy Vault Labs | Tax withholding(F) | 3K | $3.54 | $9K |
| Nov 13, 2025 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 10K | $3.54 | $35K |
| Oct 15, 2025 | Ladwa Akshay | Chief Operations Officer | Gift(G) | 50K | — | $0 |
| Oct 10, 2025 | Wiese Christopher | President, Energy Vault Labs | Tax withholding(F) | 6K | $2.97 | $17K |
| Oct 10, 2025 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 17K | $2.97 | $51K |
| Oct 10, 2025 | Beer Michael Thomas | Chief Financial Officer | Tax withholding(F) | 16K | $2.97 | $46K |
| Oct 10, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 14K | $2.97 | $41K |
| Sep 25, 2025 | Ladwa Akshay | Chief Operations Officer | Sell(S) | 75K | $3.11 | $233K |
| Sep 24, 2025 | Ladwa Akshay | Chief Operations Officer | Sell(S) | 75K | $2.98 | $224K |
| Sep 23, 2025 | Ladwa Akshay | Chief Operations Officer | Sell(S) | 75K | $3.24 | $243K |
| Sep 22, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 10K | $2.02 | $21K |
| Sep 22, 2025 | Wiese Christopher | President, Energy Vault Labs | Tax withholding(F) | 9K | $2.02 | $18K |
| Sep 22, 2025 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 13K | $2.02 | $27K |
| Sep 19, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Buy(P) | 18K | $3.02 | $53K |
| Sep 18, 2025 | Paulson Larry | Director | Buy(P) | 20K | $2.40 | $48K |
| Sep 17, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Buy(P) | 50K | $2.30 | $115K |
| Sep 16, 2025 | Paulson Larry | Director | Grant(A) | 161K | — | $0 |
| Sep 16, 2025 | Ertel Thomas R | Director | Grant(A) | 161K | — | $0 |
| Sep 16, 2025 | Mandanas Mary Beth | Director | Grant(A) | 161K | — | $0 |
| Sep 16, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Buy(P) | 25K | $2.21 | $55K |
| Sep 16, 2025 | Fariello Theresa M | Director | Grant(A) | 140K | — | $0 |
| Sep 16, 2025 | Unwin Stephanie | Director | Grant(A) | 140K | — | $0 |
| Sep 16, 2025 | Hixon Dylan | Director | Grant(A) | 98K | — | $0 |
| Sep 12, 2025 | Beer Michael Thomas | Chief Financial Officer | Sell(S) | 50K | $2.17 | $109K |
| Sep 11, 2025 | Mandanas Mary Beth | Director | Buy(P) | 10K | $2.05 | $21K |
| Sep 4, 2025 | Ladwa Akshay | Chief Operations Officer | Tax withholding(F) | 8K | $1.14 | $9K |
| Sep 4, 2025 | Wiese Christopher | President, Energy Vault Labs | Tax withholding(F) | 3K | $1.14 | $3K |
| Sep 4, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Tax withholding(F) | 3K | $1.14 | $3K |
| Aug 29, 2025 | Hixon Dylan | Director | Buy(P) | 20K | $1.92 | $38K |
| Aug 29, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Buy(P) | 23K | $1.92 | $43K |
| Aug 28, 2025 | Paulson Larry | Director | Buy(P) | 20K | $1.78 | $36K |
| Aug 28, 2025 | Ertel Thomas R | Director | Buy(P) | 11K | $1.81 | $20K |
| Aug 28, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Buy(P) | 55K | $1.71 | $94K |
| Aug 26, 2025 | Fariello Theresa M | Director | Buy(P) | 5K | $1.71 | $9K |
| Aug 21, 2025 | Wiese Christopher | President, Energy Vault Labs | Buy(P) | 6K | $1.59 | $10K |
| Aug 14, 2025 | Hixon Dylan | Director | Buy(P) | 20K | $1.50 | $30K |
| Aug 13, 2025 | Paulson Larry | Director | Buy(P) | 20K | $1.38 | $28K |
| Aug 11, 2025 | Ertel Thomas R | Director | Buy(P) | 13K | $1.44 | $19K |
| Jul 18, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Sell(S) | 12K | $0.81 | $10K |
| Jul 18, 2025 | Wiese Christopher | Chief Operating Officer | Sell(S) | 5K | $0.81 | $4K |
| Jul 18, 2025 | Beer Michael Thomas | Chief Financial Officer | Sell(S) | 34K | $0.81 | $27K |
| Jul 18, 2025 | Ladwa Akshay | Chief Engineering Officer | Sell(S) | 15K | $0.81 | $12K |
| Jun 6, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Sell(S) | 9K | $0.98 | $9K |
| Jun 6, 2025 | Wiese Christopher | Chief Operating Officer | Sell(S) | 9K | $0.98 | $9K |
| Jun 6, 2025 | Ladwa Akshay | Chief Engineering Officer | Sell(S) | 18K | $0.98 | $17K |
| May 16, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Sell(S) | 40K | $0.94 | $38K |
| Apr 29, 2025 | Wiese Christopher | Chief Operating Officer | Sell(S) | 22K | $0.71 | $15K |
| Apr 29, 2025 | Ladwa Akshay | Chief Engineering Officer | Sell(S) | 57K | $0.71 | $40K |
| Apr 4, 2025 | Wiese Christopher | Chief Operating Officer | Sell(S) | 21K | $0.71 | $15K |
| Apr 4, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Sell(S) | 17K | $0.71 | $12K |
| Apr 4, 2025 | Ladwa Akshay | Chief Engineering Officer | Sell(S) | 27K | $0.71 | $19K |
| Mar 24, 2025 | Wiese Christopher | Chief Operating Officer | Grant(A) | 250K | — | $0 |
| Mar 24, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Grant(A) | 2.5M | — | $0 |
| Mar 24, 2025 | Ladwa Akshay | Chief Engineering Officer | Grant(A) | 850K | — | $0 |
| Mar 24, 2025 | Beer Michael Thomas | Chief Financial Officer | Grant(A) | 100K | — | $0 |
| Feb 7, 2025 | Piconi Robert | Chief Executive Officer, Director, 10% Owner | Sell(S) | 3K | $1.64 | $5K |
Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.
Coverage: Form 4 filings indexed 2021-04-26 → 2026-07-11. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).