AllianceBernstein (AMPL) holds 317,618 shares of Amplitude (0.3%) — Schedule 13G/A

Rhea-AI Filing Summary

AllianceBernstein L.P. filed an amendment to a Schedule 13G to report beneficial ownership of 317,618 shares of Amplitude Inc. (CUSIP 03213A104) representing 0.3% of the class as of 03/31/2026. The filing states these shares are held for client discretionary investment advisory accounts.

AllianceBernstein reports 315,918 shares of sole voting power and 317,618 shares of sole dispositive power. The filing notes AllianceBernstein is a majority‑owned subsidiary of Equitable Holdings, Inc., but operates under independent management. The reporter certifies ownership of 5% or less of the class.

Insights

Institutional Ownership Analyst

Minor passive stake reported by a major asset manager.

AllianceBernstein reports 317,618 shares or 0.3% of Amplitude common stock, held in discretionary client accounts as of 03/31/2026. The position size is below the 5% reporting threshold used for Schedule 13G disclosures.

The filing clarifies voting and dispositive powers: 315,918 sole votes and 317,618 sole dispositive. Subsequent institutional activity will depend on client mandates and portfolio rebalancing; timing and cash‑flow treatment are not specified in the excerpt.

Regulatory Compliance Officer

Amendment aligns with passive investor disclosure requirements.

The Schedule 13G/A amendment identifies the filer, address, CUSIP 03213A104, and the beneficial ownership percentages, meeting Section 13 reporting elements. It also reiterates the filer’s subsidiary relationship with Equitable Holdings and independent decision‑making language.

Filing signatures and the amendment date (05/15/2026) complete the formal record; no additional qualifiers (e.g., activist intent) are stated in the excerpt.

Key Figures

Beneficial ownership: 317,618 shares Percent of class: 0.3% Sole voting power: 315,918 shares +3 more

6 metrics

Beneficial ownership 317,618 shares as of 03/31/2026

Percent of class 0.3% Reported on Schedule 13G/A

Sole voting power 315,918 shares voting power reported by filer

Sole dispositive power 317,618 shares dispositive power reported by filer

CUSIP 03213A104 Amplitude Inc common stock

Signature date 05/15/2026 amendment signature date

Key Terms

Schedule 13G/A, Beneficial ownership, Sole dispositive power, CUSIP

4 terms

Schedule 13G/A regulatory

"Amendment to a Schedule 13G to report beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficial ownership regulatory

"Amount beneficially owned: 317,618 shares acquired solely for investment purposes"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 317,618"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

CUSIP other

"CUSIP No.: 03213A104"

A CUSIP is a nine-character alphanumeric code that uniquely identifies a U.S. or Canadian financial security—such as a stock, bond, or fund share—like a Social Security number for an investment. It matters to investors because brokers, exchanges and record-keepers use the CUSIP to match trades, track ownership, settle transactions and pull accurate records, reducing errors and ensuring money and securities go to the right place.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Amplitude Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

03213A104

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 03213A104

1

Names of Reporting Persons

AllianceBernstein L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 315,918.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 317,618.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

317,618.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.3 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Amplitude Inc
(b)	Address of issuer's principal executive offices: 201 THIRD STREET, SUITE 200,, SAN FRANCISCO,, CA, 94103
Item 2.
(a)	Name of person filing: AllianceBernstein L.P. ("AllianceBernstein L.P.")
(b)	Address or principal business office or, if none, residence: 501 Commerce Street, Nashville, TN 37203 All media outlets, please contact Jennifer Will at AllianceBernstein (212-969-1157) with any questions. All other questions can be directed to Section13USFilings@alliancebernstein.com.
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 03213A104
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 317,618 shares acquired solely for investment purposes on behalf of client discretionary investment advisory accounts.* *AllianceBernstein L.P. is a majority owned subsidiary of Equitable Holdings, Inc. ("EQH"). AllianceBernstein operates under independent management and makes independent decisions from EQH and its respective subsidiaries, and EQH calculates and reports beneficial ownership separately from AllianceBernstein pursuant to guidance provided by the Securities and Exchange Commission in Release Number 34-39538 (January 12, 1998).
(b)	Percent of class: 0.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 315,918
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 317,618
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

AllianceBernstein L.P.

Signature:	Marcus Edwards
Name/Title:	AVP/ Senior Compliance Associate
Date:	05/15/2026

FAQ

What stake does AllianceBernstein report in Amplitude (AMPL)?

AllianceBernstein reports beneficial ownership of 317,618 shares, representing 0.3% of Amplitude common stock as of 03/31/2026. The shares are held in discretionary client investment accounts.

Does AllianceBernstein have voting control over the reported shares?

Yes. The filing shows 315,918 shares as sole voting power and 0 shared voting power. It also lists 317,618 shares as sole dispositive power, indicating control of disposition for those shares.

Is this a passive Schedule 13G filing or an active Schedule 13D?

This is an amendment to a Schedule 13G, which is used by passive investors. The filing states ownership is for client discretionary accounts and affirms ownership of 5% or less of the class.

Who filed the amendment and when was it signed?

The amendment was filed by AllianceBernstein L.P. (address shown in Nashville) and the signature block is dated 05/15/2026, with the beneficial ownership reported as of 03/31/2026.

Does the filing say AllianceBernstein and Equitable Holdings act together?

No. The filing notes AllianceBernstein is a majority‑owned subsidiary of Equitable Holdings but states AllianceBernstein operates under independent management and that Equitable Holdings reports its ownership separately per guidance.