Liu Curtis — SEC Form 4 filings
SEC reporting owner CIK 1883022. 15 Form 4 filings on record with FilingPulse; latest filed 2026-08-18.
Transaction summary — filings shown
Covers all 15 filings on record, filed 2024-02-05 to 2026-08-18. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 5 legs across 5 filings — 125,835 shares, $1,010,318 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 14.
- Largest priced transaction: sale of 33,201 shares @ $8.01 ($265,840) in Amplitude, Inc., filed 2026-03-10.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Amplitude, Inc. (AMPL) | Chief Technology Officer, Director, 10% owner | 15 | — | 5 legs · 125,835 sh · $1,010,318 | 14 |
Form 4 filings — Liu Curtis
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-18 | 4 | Amplitude, Inc. (AMPL) | Tax withholding (F): 53,878 @ $13.03 | EDGAR |
| 2026-07-10 | 4 | Amplitude, Inc. (AMPL) | Gift (G): 175,000 (derivative) @ $0 · Gift (G): 175,000 (derivative) @ $0 | EDGAR |
| 2026-06-16 | 4/A | Amplitude, Inc. (AMPL) | Sale (S): 22,786 @ $8.03 | EDGAR |
| 2026-06-03 | 4 | Amplitude, Inc. (AMPL) | Sale (S): 22,201 @ $8.03 | EDGAR |
| 2026-05-19 | 4 | Amplitude, Inc. (AMPL) | Tax withholding (F): 40,279 @ $6.06 | EDGAR |
| 2026-05-06 | 4 | Amplitude, Inc. (AMPL) | Sale (S): 17,586 @ $8.12 | EDGAR |
| 2026-04-17 | 4 | Amplitude, Inc. (AMPL) | Grant/award (A): 417,827 @ $0 | EDGAR |
| 2026-03-10 | 4 | Amplitude, Inc. (AMPL) | Sale (S): 33,201 @ $8.01 | EDGAR |
| 2026-03-09 | 4 | Amplitude, Inc. (AMPL) | Sale (S): 30,061 @ $8.00 | EDGAR |
| 2026-02-17 | 4 | Amplitude, Inc. (AMPL) | Tax withholding (F): 26,672 @ $6.34 | EDGAR |
| 2025-11-18 | 4 | Amplitude, Inc. (AMPL) | Tax withholding (F): 36,092 @ $10.73 | EDGAR |
| 2025-08-19 | 4 | Amplitude, Inc. (AMPL) | Tax withholding (F): 34,301 @ $11.47 | EDGAR |
| 2025-05-19 | 4 | Amplitude, Inc. (AMPL) | Tax withholding (F): 25,533 @ $12.14 | EDGAR |
| 2025-04-29 | 4 | Amplitude, Inc. (AMPL) | Grant/award (A): 852,878 @ $0 | EDGAR |
| 2024-02-05 | 4 | Amplitude, Inc. (AMPL) | Option exercise (M): 23,866 @ $4.19 · Conversion (C): 23,866 @ $0 · Option exercise (M): 23,866 (derivative) @ $0 · Conversion (C): 23,866 (derivative) @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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