SEC Form 4 reporting owner

Liu Curtis

Liu Curtis has filed 9 Form 4 transactions reported between February 15, 2026 and August 17, 2026, as Chief Technology Officer of Amplitude, Inc..

Name as filed: Liu Curtis

Open-market buys, 24 mo

None

reported

Open-market sales, 24 mo

$827K

4 lines

Companies

with Form 4 filings

Latest transaction

Aug 17, 2026

transaction date

Roles and reported holdings

AMPLAmplitude, Inc.
Feb 15, 2026 – Aug 17, 2026
Chief Technology Officer
Held directly950,316 sh as of Aug 17, 2026 · Form 4
Held indirectly (latest line)7,207,208 sh as of Jul 8, 2026 · Form 4
24 months: $827K sold

Transaction history

All 9 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

Date	Company	Type	Shares	Price	Value	Owned after	Filing
Aug 17, 2026	AMPLChief Technology Officer	Shares withheld for tax or exercise priceCode F · direct	53,878	$13.03	$702K@ $13.03	950,316	Form 4
Jul 8, 2026	AMPLChief Technology Officer	GiftCode G · indirect	175,000	—	—	7,207,208	Form 4
Jun 1, 2026	AMPLChief Technology Officer	Open-market saleCode S · direct	22,201	$8.03	$178K@ $8.03	1,004,779	Form 4
May 15, 2026	AMPLChief Technology Officer	Shares withheld for tax or exercise priceCode F · direct	40,279	$6.06	$244K@ $6.06	1,026,980	Form 4
May 4, 2026	AMPLChief Technology Officer	Open-market saleCode S · direct	17,586	$8.12	$143K@ $8.12	1,067,259	Form 4
Apr 15, 2026	AMPLChief Technology Officer	Grant or awardCode A · direct	417,827	—	—	1,084,845	Form 4
Mar 6, 2026	AMPLChief Technology Officer	Open-market saleCode S · direct	33,201	$8.01	$266K@ $8.01	603,756	Form 4
Mar 5, 2026	AMPLChief Technology Officer	Open-market saleCode S · direct	30,061	$8.00	$241K@ $8.00	636,957	Form 4
Feb 15, 2026	AMPLChief Technology Officer	Shares withheld for tax or exercise priceCode F · direct	26,672	$6.34	$169K@ $6.34	730,280	Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.