Amplitude CTO sells 22,786 shares under 10b5-1 plan

Rhea-AI Filing Summary

Amplitude, Inc. Chief Technology Officer Curtis Liu reported an open-market sale of 22,786 shares of Class A common stock on June 1, 2026 at a weighted average price of $8.0259 per share, executed under a pre-arranged Rule 10b5-1 trading plan adopted on November 26, 2025.

Due to a broker administrative error, 585 fewer shares were actually sold than required by the plan; the broker corrected this through its error account, crediting Liu for 585 shares at the June 1, 2026 sale price and absorbing the cost, with no additional open-market sale.

Following the transaction, Liu directly owns 1,004,194 shares, which include 880,520 restricted stock units.

Insider Trade Summary 10b5-1

Net Seller: 22,786 shares

Net Sell 1 txn

Insider Liu Curtis

Role Chief Technology Officer

Sold 22,786 shs ($183K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	22,786	$8.0259	$183K

Holdings After Transaction: Class A Common Stock — 1,004,194 shares (Direct)

Footnotes (4)

1. F1. The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 26, 2025.
2. 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.
3. 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.
4. F4. Includes 880,520 restricted stock units.

Key Figures

Shares sold: 22,786 shares Weighted average sale price: $8.0259 per share Shares held after transaction: 1,004,194 shares +2 more

5 metrics

Shares sold 22,786 shares Class A Common Stock sold on June 1, 2026

Weighted average sale price $8.0259 per share Open-market sale on June 1, 2026

Shares held after transaction 1,004,194 shares Direct ownership following June 1, 2026 sale

Restricted stock units held 880,520 RSUs Included within post-transaction holdings

Broker error share difference 585 shares Fewer shares sold than plan required; corrected via broker error account

Key Terms

Rule 10b5-1 trading plan, weighted average sale price, restricted stock units, error account

4 terms

Rule 10b5-1 trading plan regulatory

"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 26, 2025."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average sale price financial

"The price reported in Column 4 above reflects the weighted average sale price."

restricted stock units financial

"Includes 880,520 restricted stock units."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

error account financial

"The error was corrected through the broker's error account, with the broker crediting the Reporting Person for the additional 585 shares..."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Amplitude (AMPL) CTO Curtis Liu report?

Curtis Liu reported selling 22,786 shares of Amplitude Class A common stock. The sale occurred on June 1, 2026 as an open-market transaction under a pre-arranged Rule 10b5-1 trading plan adopted on November 26, 2025, using a weighted average sale price.

At what price did Amplitude (AMPL) CTO Curtis Liu sell his shares?

The reported weighted average sale price was $8.0259 per share. The transaction was executed in multiple trades at prices ranging from $8.0000 to $8.0600, with the single figure disclosed representing the weighted average across all those trades.

How many Amplitude (AMPL) shares does Curtis Liu hold after this Form 4/A?

After the reported transaction, Curtis Liu holds 1,004,194 shares. This total reflects his direct ownership in Amplitude Class A common stock and includes 880,520 restricted stock units as part of his overall equity position.

Was the Amplitude (AMPL) insider sale by Curtis Liu under a 10b5-1 plan?

Yes, the sale was executed under a Rule 10b5-1 trading plan. The plan was adopted on November 26, 2025 and governed the June 1, 2026 open-market sale, indicating the trades were pre-arranged rather than timed at discretion.

What broker error is described in the Amplitude (AMPL) Form 4/A footnotes?

A broker administrative error caused 585 fewer shares to be sold than planned. The broker corrected this through its error account, crediting Liu for 585 shares at the June 1, 2026 sale price and absorbing the cost, without any additional open-market sale.

How many restricted stock units does Amplitude (AMPL) CTO Curtis Liu hold?

Curtis Liu’s reported holdings include 880,520 restricted stock units. These RSUs form a substantial part of his total 1,004,194-share position following the June 1, 2026 transaction reported in the amended Form 4/A.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/16/2026 - 05:15 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Liu Curtis

(Last) (First) (Middle)

C/O AMPLITUDE, INC.

201 THIRD STREET, SUITE 200

(Street)

SAN FRANCISCO CALIFORNIA 94103

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Amplitude, Inc. [ AMPL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Technology Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)
06/03/2026

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	06/01/2026		S		22,786(1)(2)	D	$8.0259(3)	1,004,194(4)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 26, 2025.

2. 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.

3. 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.

4. Includes 880,520 restricted stock units.

	/s/ Elizabeth Fisher, as attorney in fact for Curtis Liu	06/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)