Amplitude: Anne L. Skates proposes 48-share sale

Anne L. Skates’s account also appears in prior sale records, including 185,000 shares sold on September 10, 2026, for gross proceeds of $2,275,219.06.

Available on EDGAR 11/09/2026 - 04:29 PM EST Accepted by SEC EDGAR 11/09/2026 - 04:28 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Amplitude, Inc. is identified as the issuer in a notice reporting a proposed sale of 48 Class A shares, with an aggregate market value of $838.77 and an approximate sale date of November 9, 2026. The remarks identify Anne L. Skates’s account as the account for the sale; she is the spouse of Spenser J. Skates, an officer and director. The notice gives June 11, 2026 as the Rule 10b5-1 plan adoption date.

Key Figures

Proposed sale: 48 Class A shares Aggregate market value: $838.77 Shares outstanding: 104,103,514 shares +3 more

6 metrics

Proposed sale 48 Class A shares Approximate sale date: November 9, 2026

Aggregate market value $838.77 For the 48 Class A shares proposed for sale

Shares outstanding 104,103,514 shares Reported in the securities information section

Prior sale 185,000 shares September 10, 2026

Gross proceeds $2,275,219.06 Prior sale on September 10, 2026

Rule 10b5-1 plan adoption date June 11, 2026 Date stated for the plan

Key Terms

Rule 10b5-1, Pre-IPO Shares, Aggregate Market Value

3 terms

Rule 10b5-1 regulatory

"Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

Pre-IPO Shares financial

"Nature of Acquisition Transaction | Pre-IPO Shares"

Aggregate Market Value financial

"Number of Shares or Other Units To Be Sold | Aggregate Market Value"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

How many AMPL shares are proposed for sale?

The notice lists 48 Class A shares with an aggregate market value of $838.77 and an approximate sale date of November 9, 2026.

What recent AMPL sales are listed for Anne L. Skates’s account?

The listed sales include 185,000 shares on September 10, 2026, for gross proceeds of $2,275,219.06, and 107,136 shares on October 23, 2026, for gross proceeds of $1,876,822.62.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001882913
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Amplitude, Inc.
SEC File Number	001-40817
Address of Issuer	201 THIRD STREET, SUITE 200 SAN FRANCISCO CALIFORNIA 94103
Phone	(415) 231-2353
Name of Person for Whose Account the Securities are To Be Sold	Skates Spenser
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Member of immediate family of any of the foregoing

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Class A	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	48	838.77	104103514	11/09/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Class A	12/07/2011	Pre-IPO Shares	Issuer			48	12/07/2011	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Anne L. Skates 201 Third Street Suite 200 San Francisco CA 94103	Class A	09/10/2026	185000	2275219.06
Anne L. Skates 201 Third Street Suite 200 San Francisco CA 94103	Class A	09/30/2026	1374	19857.42
Anne L. Skates 201 Third Street Suite 200 San Francisco CA 94103	Class A	10/01/2026	3539	51138.55
Anne L. Skates 201 Third Street Suite 200 San Francisco CA 94103	Class A	10/02/2026	70087	1017553.05
Anne L. Skates 201 Third Street Suite 200 San Francisco CA 94103	Class A	10/23/2026	107136	1876822.62
Anne L. Skates 201 Third Street, Suite 200 San Francisco CA 94103	Class A	10/26/2026	300	5239.00
Anne L. Skates 201 Third StreeT Suite 200 San Francisco CA 94103	Class A	10/28/2026	16499	288472.75
Anne L. Skates 201 Third Street Suite 200 San Francisco CA 94103	Class A	11/04/2026	901	15734.05
Anne L. Skates 201 Third Street Suite 200 San Francisco CA 94103	Class A	11/05/2026	61	1105.49

144: Remarks and Signature

Remarks	Today's sale and the securities sold in the past 3 months took place in the account of Anne L. Skates, who is the spouse of Spenser J. Skates, an Officer and Director of the company.
Date of Notice	11/09/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/11/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Spenser Skates
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)