Curtis Liu

CIK: 0001883022

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)5 (33.3%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)2 (13.3%)

Compensation grants

Other (G, F, J, C, D, …)8 (53.3%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

AMPL

Amplitude, Inc.

DirectorOfficer10% Owner

Discretionary Trading P&L

Holdings

Transaction History (15 total)

AMPL
Amplitude, Inc.
Aug 17, 2026
Tax Payment(F)
Direct
53.9K shares at avg. $13.03$702K
AMPL
Amplitude, Inc.
Jul 8, 2026
Gift(G)
Class B Common Stock
Indirect
175K shares-
AMPL
Amplitude, Inc.
Jul 8, 2026
Gift(G)
Class B Common Stock
Indirect
175K shares-
AMPL
Amplitude, Inc.
Jun 1, 2026
Sale(S)
Direct
22.8K shares at avg. $8.03$183K
AMPL
Amplitude, Inc.
Jun 1, 2026
Sale(S)
Direct
22.2K shares at avg. $8.03$178K
AMPL
Amplitude, Inc.
May 15, 2026
Tax Payment(F)
Direct
40.3K shares at avg. $6.06$244K
AMPL
Amplitude, Inc.
May 4, 2026
Sale(S)
Direct
17.6K shares at avg. $8.12$143K
AMPL
Amplitude, Inc.
Apr 15, 2026
Award(A)
Direct
417.8K shares-
AMPL
Amplitude, Inc.
Mar 6, 2026
Sale(S)
Direct
33.2K shares at avg. $8.01$266K
AMPL
Amplitude, Inc.
Mar 5, 2026
Sale(S)
Direct
30.1K shares at avg. $8.00$241K
AMPL
Amplitude, Inc.
Feb 15, 2026
Tax Payment(F)
Direct
26.7K shares at avg. $6.34$169K
AMPL
Amplitude, Inc.
Nov 15, 2025
Tax Payment(F)
Direct
36.1K shares at avg. $10.73$387K
AMPL
Amplitude, Inc.
Aug 15, 2025
Tax Payment(F)
Direct
34.3K shares at avg. $11.47$393K
AMPL
Amplitude, Inc.
May 15, 2025
Tax Payment(F)
Direct
25.5K shares at avg. $12.14$310K
AMPL
Amplitude, Inc.
Apr 25, 2025
Award(A)
Direct
852.9K shares-

		Type	Shares	Price		Ownership
Aug 17, 2026	AMPL Amplitude, Inc.	Tax Payment(F)	53,878	$13.03	$702,030	Direct
Jul 8, 2026	AMPL Amplitude, Inc.	Gift(G) Class B Common Stock	175,000	-	-	Indirect
Jul 8, 2026	AMPL Amplitude, Inc.	Gift(G) Class B Common Stock	175,000	-	-	Indirect
Jun 1, 2026	AMPL Amplitude, Inc.	Sale(S)	22,786	$8.03	$182,878	Direct
Jun 1, 2026	AMPL Amplitude, Inc.	Sale(S)	22,201	$8.03	$178,183	Direct
May 15, 2026	AMPL Amplitude, Inc.	Tax Payment(F)	40,279	$6.06	$244,091	Direct
May 4, 2026	AMPL Amplitude, Inc.	Sale(S)	17,586	$8.12	$142,877	Direct
Apr 15, 2026	AMPL Amplitude, Inc.	Award(A)	417,827	-	$0	Direct
Mar 6, 2026	AMPL Amplitude, Inc.	Sale(S)	33,201	$8.01	$265,840	Direct
Mar 5, 2026	AMPL Amplitude, Inc.	Sale(S)	30,061	$8.00	$240,539	Direct
Feb 15, 2026	AMPL Amplitude, Inc.	Tax Payment(F)	26,672	$6.34	$169,100	Direct
Nov 15, 2025	AMPL Amplitude, Inc.	Tax Payment(F)	36,092	$10.73	$387,267	Direct
Aug 15, 2025	AMPL Amplitude, Inc.	Tax Payment(F)	34,301	$11.47	$393,432	Direct
May 15, 2025	AMPL Amplitude, Inc.	Tax Payment(F)	25,533	$12.14	$309,971	Direct
Apr 25, 2025	AMPL Amplitude, Inc.	Award(A)	852,878	-	-	Direct

1-15 of 15 transactions

About Liu Curtis

Liu Curtis (SEC CIK 0001883022) files insider reports with the SEC as Chief Technology Officer of Amplitude, Inc. (AMPL).

Signal8 holds 14 ownership filings by Liu Curtis, all Form 4s, filed between Apr 29, 2025 and Aug 18, 2026. Those filings report 15 transactions, from Apr 25, 2025 to Aug 17, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Liu Curtis's filings is in SAN FRANCISCO, CA.

Recent filings by Liu Curtis

Aug 17, 2026: Tax withholding of AMPL shares (Form 4, code F).
Jul 8, 2026: Gifts of AMPL derivative securities (2 lines, Form 4, code G).
Jun 1, 2026: Open-market sales of AMPL shares (2 lines, Form 4, code S).
May 15, 2026: Tax withholding of AMPL shares (Form 4, code F).
May 4, 2026: Open-market sale of AMPL shares (Form 4, code S).

Other insiders filing for Amplitude, Inc. (AMPL)

Skates Spenser, CEO and President
Raji Vijaye Ganesh, Director
Schultz Erica, Director
Tzuo Tien, Director
Crook Nathaniel Glenn, Chief Commercial Officer
Casey Andrew, Chief Financial Officer

How to read Form 4 transaction codes