Form 4/A for AMPL Amplitude, Inc.

Accepted 2026-06-16 17:15:11 ET · period of report 2026-06-01 · accession 0001610717-26-000228 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
AT	2026-06-16 17:15	2026-06-01	AMPL	Liu Curtis	CTO, Dir, 10%	S - Sale	$8.03	-22.8K	1.00M	-2%	-$182.9K

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Class A Common Stock	2026-06-01	S	D	22,786	$8.03	1,004,194	D	—	—	(F1) The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 26, 2025. (F2) This Form 4/A is being filed solely to correct the number of shares reported as sold on June 1, 2026 and the total number of shares owned following the transaction. Due to a broker administrative error, 585 fewer shares were sold than were required pursuant to the Reporting Person's Rule 10b5-1 trading plan. The error was corrected through the broker's error account, with the broker crediting the Reporting Person for the additional 585 shares at the applicable June 1, 2026 sale price and absorbing the cost of the correction. No additional open-market sale was effected in connection with the correction. (F3) This transaction was executed in multiple trades at prices ranging from $8.0000 to $8.0600. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. (F4) Includes 880,520 restricted stock units.