Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| Ambiq Micro, Inc.AMBQ · Entity 751 | Director | September 11, 2026 | September 15, 2026 |
| PTK Acquisition Corp.PTK.U · Entity 147841 | Director · Secretary | July 13, 2020 | July 14, 2020 |
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.
Ambiq Micro, Inc.
Report date September 11, 2026 · Filed September 15, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common StockSEC Table I · non-derivative | Direct | 20,366 |
Ending reported balance
After 2026-09-11 transaction · row 2
2 source rows · reconciled sequenceRow 1 · 2026-09-11 · Sale · Disposed 9,100 · Balance 21,266 F1: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.85 to $63.84 per share. 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 in this footnote. Row 2 · 2026-09-11 · Sale · Disposed 900 · Balance 20,366 F2: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $63.87 to $64.05 per share. 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 in this footnote. |
Filing footnotes · ownership attribution and instrument terms
F1: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.85 to $63.84 per share. 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 in this footnote.
F2: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $63.87 to $64.05 per share. 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 in this footnote.
PTK Acquisition Corp.
Report date July 13, 2020 · Filed July 14, 2020
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common StockSEC Table I · non-derivative | IndirectSee Footnote | 930,556 |
Reported balance
Holding disclosure · report date 2020-07-13 · row 1
Holding and transaction disclosures are not merged.
1 source rowRow 1 · Balance 930,556 F1: This total is the proportionate amount of shares owned by the Reporting Person. The shares are held in the name of PTK Holdings LLC. The Reporting Person disclaims beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly. |
Filing footnotes · ownership attribution and instrument terms
F1: This total is the proportionate amount of shares owned by the Reporting Person. The shares are held in the name of PTK Holdings LLC. The Reporting Person disclaims beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly.
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 |
|---|---|---|---|---|---|---|
| September 11, 2026 Filed Sep 15, 2026 22:58 UTC | Ambiq Micro, Inc. AMBQ · Entity 751 | SaleCommon Stock | 900 | $63.95 | $57,552.03 |
DisclosureSEC source: 0001266870-26-000006 · form4-09152026_100924.xml · nonDerivative · entry 2 ZHANG KER · CIK 0001266870 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 20,366 F2 · price: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $63.87 to $64.05 per share. 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 in this footnote. Read SEC document |
| September 11, 2026 Filed Sep 15, 2026 22:58 UTC | Ambiq Micro, Inc. AMBQ · Entity 751 | SaleCommon Stock | 9,100 | $63.39 | $576,808.96 |
DisclosureSEC source: 0001266870-26-000006 · form4-09152026_100924.xml · nonDerivative · entry 1 ZHANG KER · CIK 0001266870 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 21,266 F1 · price: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.85 to $63.84 per share. 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 in this footnote. Read SEC document |
| September 04, 2026 Filed Sep 9, 2026 21:08 UTC | Ambiq Micro, Inc. AMBQ · Entity 751 | Exercise / conversionStock Option (Right to Buy) · Derivative | 1,785 | $0.00 Strike: $5.88 | $0.00 |
DisclosureSEC source: 0001266870-26-000004 · form4-09092026_090917.xml · derivative · entry 3 ZHANG KER · CIK 0001266870 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 1,785 shares Expires 2026-09-07 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. F1 · derivative.exercise_date: 1/4 of the shares subject to the option vested on September 8, 2017, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service. Read SEC document |
| September 04, 2026 Filed Sep 9, 2026 21:08 UTC | Ambiq Micro, Inc. AMBQ · Entity 751 | SaleCommon Stock | 185 | $56.92 | $10,530.20 |
DisclosureSEC source: 0001266870-26-000004 · form4-09092026_090917.xml · nonDerivative · entry 2 ZHANG KER · CIK 0001266870 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 30,366 Read SEC document |
| September 04, 2026 Filed Sep 9, 2026 21:08 UTC | Ambiq Micro, Inc. AMBQ · Entity 751 | Exercise / conversionCommon Stock | 1,785 | $5.88 | $10,495.80 |
DisclosureSEC source: 0001266870-26-000004 · form4-09092026_090917.xml · nonDerivative · entry 1 ZHANG KER · CIK 0001266870 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 30,551 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 |
| June 08, 2026 Filed Jun 10, 2026 20:42 UTC | Ambiq Micro, Inc. AMBQ · Entity 751 | GrantCommon Stock | 4,957 | $0.00 | $0.00 |
DisclosureSEC source: 0001266870-26-000002 · form4-06102026_080615.xml · nonDerivative · entry 1 ZHANG KER · CIK 0001266870 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 28,766 F1 · shares: Represents the grant of restricted stock units ("RSUs"), each of which represents a contingent right to receive one share of the Issuer's common stock. The RSUs will vest in three equal annual installments following the date of grant, with each annual RSU vesting to occur on the earlier of: (i) the first, second, or third anniversary of the grant date, as applicable, or (ii) the date of the Company's first, second, or third annual stockholder meeting following the grant date, as applicable (or the date immediately prior to the applicable annual stockholder meeting if the Reporting Person's service as a director ends at such meeting due to the director's failure to be re-elected or the director not standing for re-election), subject to the Reporting Person's Continuous Service (as defined in the Issuer's 2025 Equity Incentive Plan). Read SEC document |
| July 29, 2025 Filed Jul 31, 2025 22:19 UTC | Ambiq Micro, Inc. AMBQ · Entity 751 | GrantCommon Stock | 23,809 | $0.00 | $0.00 |
DisclosureSEC source: 0001415889-25-020774 · form4-07312025_100733.xml · nonDerivative · entry 1 ZHANG KER · CIK 0001266870 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 23,809 F1 · shares: Consists of previously granted restricted stock units ("RSUs") for which the liquidity event-based vesting condition was satisfied upon the effectiveness of the registration statement on Form S-1 filed by the Issuer in connection with the Issuer's initial public offering. The RSUs remain subject to service-based vesting conditions. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock upon settlement. 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.