person · Reporting owner
Stefan Constantin Ionel
Disclosed activity across 1 company
Sign in to followReported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| Amprius Technologies, Inc.AMPX · Entity 4742 | Chief Technology Officer | August 21, 2026 | August 25, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
Amprius Technologies, Inc.
Report date August 21, 2026 · Filed August 25, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common stockSEC Table I · non-derivative | Direct | 771,629 |
Reported balance
After 2026-08-21 transaction · row 1
Account or security details depend on footnotes; rows are not merged.
1 source rowRow 1 · 2026-08-21 · Sale · Disposed 29,681 · Balance 771,629 F1: This transaction was effected pursuant to non-discretionary, sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations in connection with the vesting of restricted stock units. F2: The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $10.10 to $10.48, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. F3: Includes 525,176 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit. |
Filing footnotes · ownership attribution and instrument terms
F1: This transaction was effected pursuant to non-discretionary, sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations in connection with the vesting of restricted stock units.
F2: The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $10.10 to $10.48, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
F3: Includes 525,176 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| December 14, 2022 Filed Dec 15, 2022 23:40 UTC | Amprius Technologies, Inc. AMPX · Entity 4742 | Exercise / conversionCommon stock | 30,000 | $0.05 | $1,500.00 |
DisclosureSEC source: 0001940928-22-000002 · wf-form4_167114761444644.xml · nonDerivative · entry 1 Stefan Constantin Ionel · CIK 0001940928 · Chief Technology Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 30,000 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. Read SEC document |
| December 14, 2022 Filed May 3, 2023 21:30 UTC | Amprius Technologies, Inc. AMPX · Entity 4742 | Tax withholdingCommon stock | 209 | $7.20 | $1,504.80 |
DisclosureSEC source: 0001940928-23-000002 · wf-form4_168314942961241.xml · nonDerivative · entry 1 Stefan Constantin Ionel · CIK 0001940928 · Chief Technology Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 29,791 F1 · shares: The reporting person received 29,791 shares of common stock on net exercise of option to purchase 30,000 shares of common stock. The issuer withheld 209 shares of common stock underlying the option for payment of the exercise price, using the closing stock price on December 14, 2022, pursuant to the terms of the issuer's 2022 Equity Incentive Plan. Read SEC document |
| September 14, 2022 Filed Sep 16, 2022 23:24 UTC | Amprius Technologies, Inc. AMPX · Entity 4742 | GrantStock Option (right to buy) · Derivative | 218,385 | Not disclosed Strike: $2.61 | Not disclosed |
DisclosureSEC source: 0000899243-22-031400 · doc4.xml · derivative · entry 5 Stefan Constantin Ionel · CIK 0001940928 · Chief Technology Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 218,385 Underlying: Common Stock · 218,385 shares Expires 2032-04-13 F1 · price: On September 14, 2022, the Issuer completed a business combination (the "Business Combination") pursuant to the Business Combination Agreement, by and among the Issuer, a wholly owned subsidiary of the Issuer, and Amprius Technologies Operating, Inc. ("Legacy Amprius") At the effective time of the Business Combination (the "Effective Time"), each Legacy Amprius option was converted into an option to purchase a number of shares of Common Stock of the Issuer equal to the product (rounded down to the nearest whole number) of (i) the number of shares of Legacy Amprius common stock subject to the Legacy Amprius option immediately prior to the Effective Time multiplied by (ii) an exchange ratio of approximately 1.45590, at an exercise price per share (rounded up to the nearest whole cent) equal to (A) the exercise price per share of such Legacy Amprius option immediately prior to the Effective Time divided by (B) the Exchange Ratio. F3 · derivative.exercise_date: 1/48 of the total number of shares issuable upon exercise of the option vested on February 1, 2023, and 1/48 of the total number of shares issuable upon exercise of the option vest monthly thereafter until fully vested on January 1, 2027. Read SEC document |
| September 14, 2022 Filed Sep 16, 2022 23:24 UTC | Amprius Technologies, Inc. AMPX · Entity 4742 | GrantStock Option (right to buy) · Derivative | 72,795 | Not disclosed Strike: $1.78 | Not disclosed |
DisclosureSEC source: 0000899243-22-031400 · doc4.xml · derivative · entry 4 Stefan Constantin Ionel · CIK 0001940928 · Chief Technology Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 72,795 Underlying: Common Stock · 72,795 shares Expires 2031-06-16 F1 · price: On September 14, 2022, the Issuer completed a business combination (the "Business Combination") pursuant to the Business Combination Agreement, by and among the Issuer, a wholly owned subsidiary of the Issuer, and Amprius Technologies Operating, Inc. ("Legacy Amprius") At the effective time of the Business Combination (the "Effective Time"), each Legacy Amprius option was converted into an option to purchase a number of shares of Common Stock of the Issuer equal to the product (rounded down to the nearest whole number) of (i) the number of shares of Legacy Amprius common stock subject to the Legacy Amprius option immediately prior to the Effective Time multiplied by (ii) an exchange ratio of approximately 1.45590, at an exercise price per share (rounded up to the nearest whole cent) equal to (A) the exercise price per share of such Legacy Amprius option immediately prior to the Effective Time divided by (B) the Exchange Ratio. F2 · derivative.exercise_date: 1/48 of the total number of shares issuable upon exercise of the option vested on July 17, 2021, and 1/48 of the total number of shares issuable upon exercise of the option vest monthly thereafter until fully vested on June 17, 2025. Read SEC document |
| September 14, 2022 Filed Sep 16, 2022 23:24 UTC | Amprius Technologies, Inc. AMPX · Entity 4742 | GrantStock Option (right to buy) · Derivative | 72,795 | Not disclosed Strike: $0.45 | Not disclosed |
DisclosureSEC source: 0000899243-22-031400 · doc4.xml · derivative · entry 3 Stefan Constantin Ionel · CIK 0001940928 · Chief Technology Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 72,795 Underlying: Common Stock · 72,795 shares Expires 2028-03-19 F1 · price: On September 14, 2022, the Issuer completed a business combination (the "Business Combination") pursuant to the Business Combination Agreement, by and among the Issuer, a wholly owned subsidiary of the Issuer, and Amprius Technologies Operating, Inc. ("Legacy Amprius") At the effective time of the Business Combination (the "Effective Time"), each Legacy Amprius option was converted into an option to purchase a number of shares of Common Stock of the Issuer equal to the product (rounded down to the nearest whole number) of (i) the number of shares of Legacy Amprius common stock subject to the Legacy Amprius option immediately prior to the Effective Time multiplied by (ii) an exchange ratio of approximately 1.45590, at an exercise price per share (rounded up to the nearest whole cent) equal to (A) the exercise price per share of such Legacy Amprius option immediately prior to the Effective Time divided by (B) the Exchange Ratio. Read SEC document |
| September 14, 2022 Filed Sep 16, 2022 23:24 UTC | Amprius Technologies, Inc. AMPX · Entity 4742 | GrantStock Option (right to buy) · Derivative | 181,987 | Not disclosed Strike: $0.05 | Not disclosed |
DisclosureSEC source: 0000899243-22-031400 · doc4.xml · derivative · entry 2 Stefan Constantin Ionel · CIK 0001940928 · Chief Technology Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 181,987 Underlying: Common Stock · 181,987 shares Expires 2027-07-11 F1 · price: On September 14, 2022, the Issuer completed a business combination (the "Business Combination") pursuant to the Business Combination Agreement, by and among the Issuer, a wholly owned subsidiary of the Issuer, and Amprius Technologies Operating, Inc. ("Legacy Amprius") At the effective time of the Business Combination (the "Effective Time"), each Legacy Amprius option was converted into an option to purchase a number of shares of Common Stock of the Issuer equal to the product (rounded down to the nearest whole number) of (i) the number of shares of Legacy Amprius common stock subject to the Legacy Amprius option immediately prior to the Effective Time multiplied by (ii) an exchange ratio of approximately 1.45590, at an exercise price per share (rounded up to the nearest whole cent) equal to (A) the exercise price per share of such Legacy Amprius option immediately prior to the Effective Time divided by (B) the Exchange Ratio. Read SEC document |
| September 14, 2022 Filed Sep 16, 2022 23:24 UTC | Amprius Technologies, Inc. AMPX · Entity 4742 | GrantStock Option (right to buy) · Derivative | 545,962 | Not disclosed Strike: $0.05 | Not disclosed |
DisclosureSEC source: 0000899243-22-031400 · doc4.xml · derivative · entry 1 Stefan Constantin Ionel · CIK 0001940928 · Chief Technology Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 545,962 Underlying: Common Stock · 545,962 shares Expires 2024-03-15 F1 · price: On September 14, 2022, the Issuer completed a business combination (the "Business Combination") pursuant to the Business Combination Agreement, by and among the Issuer, a wholly owned subsidiary of the Issuer, and Amprius Technologies Operating, Inc. ("Legacy Amprius") At the effective time of the Business Combination (the "Effective Time"), each Legacy Amprius option was converted into an option to purchase a number of shares of Common Stock of the Issuer equal to the product (rounded down to the nearest whole number) of (i) the number of shares of Legacy Amprius common stock subject to the Legacy Amprius option immediately prior to the Effective Time multiplied by (ii) an exchange ratio of approximately 1.45590, at an exercise price per share (rounded up to the nearest whole cent) equal to (A) the exercise price per share of such Legacy Amprius option immediately prior to the Effective Time divided by (B) the Exchange Ratio. Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.