Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

Exhibit 4.1

DESCRIPTION OF THE REGISTRANT’S SECURITIES

REGISTERED PURSUANT TO SECTION 12 OF THE

SECURITIES EXCHANGE ACT OF 1934

Amplitude, Inc. (“we,” “our,” and “us”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our Class A common stock. The following description of our capital stock and provisions of our amended and restated certificate of incorporation, amended and restated bylaws, and amended and restated investors’ rights agreement, and the applicable provisions of the General Corporation Law of the State of Delaware (the “DGCL”) are summaries and are qualified by reference to our amended and restated certificate of incorporation, amended and restated bylaws, and amended and restated investors’ rights agreement, each of which has been publicly filed with the U.S. Securities and Exchange Commission, .and the applicable provisions of the DGCL.

General

Our authorized capital stock consists of:

Common Stock

We have two classes of authorized common stock: Class A common stock and Class B common stock. Only our Class A common stock is registered under Section 12 of the Exchange Act, and trades on the Nasdaq Capital Market under the ticker symbol “AMPL.”

The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion rights.

Voting rights

Shares of our Class A common stock are entitled to one vote per share and shares of our Class B common stock are entitled to five votes per share. The holders of our Class A common stock and the holders of our Class B common stock will generally vote together as a single class on all matters submitted to a vote of our stockholders, unless otherwise required by Delaware law or our restated certificate of incorporation. Delaware law could require either holders of our Class A common stock or holders of our Class B common stock to vote separately in the following circumstances:

The election of directors by our stockholders shall be determined by a plurality of the votes cast and our stockholders are not entitled to cumulative voting for the election of directors. In addition, except as otherwise provided by our amended and restated certificate of incorporation, amended and restated bylaws, the rules or regulations of the Nasdaq Stock Market LLC (“Nasdaq”), or applicable law or pursuant to any regulation applicable to us or our securities, other matters shall be generally decided by the affirmative vote of the holders of a majority in voting power of the votes cast (excluding abstentions and broker non-votes) on such matter.

Conversion rights

Each outstanding share of our Class B common stock is convertible at any time at the option of the holder into one share of our Class A common stock. Each share of our Class B common stock will convert automatically into one share of our Class A common stock upon any transfer, whether or not for value, except for certain permitted transfers described in our restated certificate of incorporation. In addition, each share of our Class B common stock held by Curtis Liu, Spenser Skates, and Jeffrey Wang, whom we refer to as our founders (or any of such founder’s affiliates), will convert automatically into one share of our Class A common stock on the earlier of (i) the death or incapacity of such founder or (ii) the date that is six months following the date on which such founder is no longer an employee or director of our company (unless such founder has rejoined our company during such six-month period). Each outstanding share of our Class B common stock will also convert automatically into one share of our Class A common stock on the date that is six months following the date on which no founder is an employee or director of our company (unless a founder has rejoined our

company during such six-month period). In addition, any transfer by a founder (or such founder’s affiliates) to one or more of the other founders (or such founders’ affiliates) will not result in the automatic conversion of such shares of Class B common stock to Class A common stock. Once converted into Class A common stock, the Class B common stock may not be reissued.

Economic rights

Dividends. Any dividend or distribution paid or payable to the holders of shares of Class A common stock and Class B common stock shall be paid pro rata, on an equal priority, pari passu basis, unless different treatment of the shares of each such class is approved by the affirmative vote of the holders of a majority of the outstanding shares of the applicable class of stock treated adversely, each voting separately as a class; provided, however, that if a dividend or distribution is paid in the form of Class A common stock or Class B common stock (or rights to acquire shares of Class A common stock or Class B common stock), then the holders of the Class A common stock shall receive Class A common stock (or rights to acquire shares of Class A common stock) and holders of Class B common stock shall receive Class B common stock (or rights to acquire shares of Class B common stock).

Liquidation. In the event of our liquidation, dissolution, or winding-up and upon the completion of the distributions required with respect to any series of redeemable convertible preferred stock that may then be outstanding, our remaining assets legally available for distribution to stockholders shall be distributed on an equal priority, pro rata basis to the holders of Class A common stock and Class B common stock.

Change of Control Transactions. In the event of certain mergers, consolidations, business combinations, or other similar transactions, shares of our Class A common stock or Class B common stock will be treated equally, identically, and will share ratably, on a per share basis, in any consideration related to such transaction, unless different treatment of the shares of each class is approved by the affirmative vote of the holders of a majority of the outstanding shares of Class A common stock and by the affirmative vote of the holders of a majority of the outstanding shares of Class B common stock, each voting separately as a class. In the event that the holders of shares of Class A common stock or Class B common stock are granted rights to elect to receive one of two or more alternative forms of consideration in connection with such transaction, the foregoing will be satisfied if holders of shares of Class A common stock and the holders of Class B common stock are granted identical election rights.

Subdivisions and Combinations. If we subdivide or combine in any manner outstanding shares of Class A common stock or Class B common stock, then the outstanding shares of the other class will be subdivided or combined in the same proportion and manner, unless different treatment of the shares of each class is approved by the affirmative vote of the holders of a majority of the outstanding shares of Class A common stock and by the affirmative vote of the holders of a majority of the outstanding shares of Class B common stock, each voting separately as a class.

No preemptive or similar rights

Holders of shares of our common stock do not have preemptive, subscription, or redemption rights. There will be no redemption or sinking fund provisions applicable to our common stock.

Fully paid and non-assessable

All of our outstanding shares of Class A common stock and Class B common stock are fully paid and non-assessable.

Preferred Stock

Under the terms of our restated certificate of incorporation, our board of directors is authorized to direct us to issue shares of preferred stock in one or more series without stockholder approval, unless required by law or by any stock exchange. Our board of directors has the discretion to determine the rights, preferences, privileges, and restrictions, including voting rights, dividend rights, conversion rights, redemption privileges, and liquidation preferences, of each series of preferred stock.

Our board of directors may authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other rights of the holders of Class A common stock and Class B common stock. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of delaying, deferring, or preventing a change in control of our company that may otherwise benefit holders of our Class A and Class B common stock and may adversely affect the market price of the Class A common stock and the voting and other rights of the holders of Class A and Class B common stock. We have no current plans to issue any shares of preferred stock.

Equity Award Amendment

Equity awards granted under our Amended and Restated 2014 Stock Option and Grant Plan (as amended, the “2014 Plan”) generally settled in shares of Class B common stock. Class B common stock automatically converts to Class A common stock upon transfer unless transferred to a permitted transferee. In connection the direct listing of our Class A common stock (our “Direct Listing”), our board of directors amended all awards outstanding under our 2014 Plan to settle into Class A common stock (the “Equity Award Amendment”). Holders of Class A common stock received as a result of the Equity Award Amendment will have the one-time right to

exchange such shares of Class A common stock for an equal number of shares of Class B common stock until such time as the Class A common stock is transferred. There are no pre-defined time period or other restrictions related to the holder’s right to exchange such shares of Class A common stock. Holders may only elect to exchange all, and not a portion, of such shares of Class A common stock. Such right will transfer to a permitted transferee.

Choice of Forum

Our restated certificate of incorporation and our amended and restated bylaws provide that: (i) unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware (or, if such court does not have subject matter jurisdiction thereof, the federal district court of the State of Delaware) will, to the fullest extent permitted by law, be the sole and exclusive forum for: (A) any derivative action or proceeding brought on our behalf, (B) any action asserting a claim for or based on a breach of a fiduciary duty owed by any of our current or former directors, officers, other employees, agents, or stockholders to us or our stockholders, including without limitation a claim alleging the aiding and abetting of such a breach of fiduciary duty, (C) any action asserting a claim against us or any of our current or former directors, officers, other employees, agents, or stockholders arising pursuant to any provision of the DGCL or our certificate of incorporation or bylaws or as to which the DGCL confers jurisdiction on the Court of Chancery of the State of Delaware, or (D) any action asserting a claim related to or involving us that is governed by the internal affairs doctrine; (ii) unless we consent in writing to the selection of an alternative forum, the federal district courts of the United States of America will, to the fullest extent permitted by law, be the sole and exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act of 1933, as amended (the “Securities Act”), and the rules and regulations promulgated thereunder; (iii) the exclusive forum provisions are intended to benefit and may be enforced by us, our officers and directors, the financial advisors to any offering giving rise to such complaint, and any other professional or entity whose profession gives authority to a statement made by that person or entity and who has prepared or certified any part of the documents underlying the offering; (iv) any person or entity purchasing or otherwise acquiring or holding any interest in our shares of capital stock will be deemed to have notice of and consented to these provisions; and (v) failure to enforce the foregoing provisions would cause us irreparable harm, and we will be entitled to equitable relief, including injunctive relief and specific performance, to enforce the foregoing provisions. Nothing in our restated certificate of incorporation or amended and restated bylaws precludes stockholders that assert claims under the Exchange Act from bringing such claims in federal court, to the extent that the Exchange Act confers exclusive federal jurisdiction over such claims, subject to applicable law.

Although our restated certificate of incorporation and amended and restated bylaws contain the choice of forum provision described above, it is possible that a court could find that such a provision is inapplicable for a particular claim or action or that such provision is unenforceable.

Anti-Takeover Provisions

Our restated certificate of incorporation and amended and restated bylaws contain provisions that may delay, defer, or discourage another party from acquiring control of us. We expect that these provisions, which are summarized below, will discourage coercive takeover practices or inadequate takeover bids. These provisions are also designed to encourage persons seeking to acquire control of us to first negotiate with our board of directors, which we believe may result in an improvement of the terms of any such acquisition in favor of our stockholders. However, they also give our board of directors the power to discourage acquisitions that some stockholders may favor.

Multi-Class Stock

As described above in “—Common Stock—Voting rights,” our restated certificate of incorporation provides for a multi-class common stock structure, pursuant to which holders of our Class B common stock, including our current investors, executives, and employees, have the ability to control the outcome of matters requiring stockholder approval, even if such holders own significantly less than a majority of the shares of the shares of our outstanding Class A common stock and Class B common stock, including the election of directors and significant corporate transactions, such as a merger or other sale of our company or its assets.

Stockholder Action and Special Meetings of Stockholders

Our restated certificate of incorporation provides that any action required or permitted to be taken by our stockholders must be effected at a duly called annual or special meeting of our stockholders and may not be effected by any consent in writing by our stockholders. Our restated certificate of incorporation further provides that special meetings of our stockholders may be called only by a majority of our board of directors, thus prohibiting a stockholder from calling a special meeting. These provisions might delay the ability of our stockholders to force consideration of a proposal or for stockholders to take any action, including the removal of directors.

Advance Notice Requirements for Stockholder Proposals and Director Nominations

Our amended and restated bylaws provide advance notice procedures for stockholders seeking to bring business before our annual meeting of stockholders or to nominate candidates for election as directors at our annual meeting of stockholders. Our amended and restated bylaws also specify certain requirements regarding the form and content of a stockholder’s notice. These provisions might

preclude our stockholders from bringing matters before our annual meeting of stockholders or from making nominations for directors at our annual meeting of stockholders if the proper procedures are not followed. We expect that these provisions might also discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of our company.

Classified Board; Election and Removal of Directors; Filling Vacancies

Our board of directors is divided into three classes, divided as nearly as equal in number as possible. The directors in each class will serve for a three-year term, one class being elected each year by our stockholders, with staggered three-year terms. Only one class of directors will be elected at each annual meeting of our stockholders, with the other classes continuing for the remainder of their respective three-year terms. Because our stockholders do not have cumulative voting rights, our stockholders holding a majority of the shares of our voting shares will be able to elect all of our directors. Our restated certificate of incorporation provides for the removal of any of our directors only for cause and requires a stockholder vote by the holders of at least a 66 2/3% of the voting power of the then outstanding voting stock. Furthermore, any vacancy on our board of directors, however occurring, including a vacancy resulting from an increase in the size of the board, may only be filled by a resolution of the board of directors unless the board of directors determines that such vacancies shall be filled by the stockholders. This system of electing and removing directors and filling vacancies may tend to discourage a third party from making a tender offer or otherwise attempting to obtain control of us because it generally makes it more difficult for stockholders to replace a majority of the directors.

Supermajority Requirements for Amendments of our Restated Certificate of Incorporation and Amended and Restated Bylaws

Certain amendments to our restated certificate of incorporation and our amended and restated bylaws require the approval of 662⁄3% of the outstanding voting power of our capital stock.

Authorized but Unissued Shares

The authorized but unissued shares of our common stock and our preferred stock are available for future issuance without stockholder approval, subject to any limitations imposed by Nasdaq rules. These additional shares may be used for a variety of corporate finance transactions, acquisitions, and employee benefit plans. The existence of authorized but unissued and unreserved common stock and preferred stock could make more difficult or discourage an attempt to obtain control of us by means of a proxy contest, tender offer, merger, or otherwise.

Section 203 of the DGCL

We are subject to the provisions of Section 203 of the DGCL. This statute prevents certain Delaware corporations, under certain circumstances, from engaging in a “business combination” with an “interested stockholder.” In general, Section 203 defines an “interested stockholder” as an entity or person who, together with the person’s affiliates and associates, beneficially owns 15% or more of the outstanding voting stock of the corporation.

A “business combination” includes a merger or sale of more than 10% of our assets. However, the above provisions of Section 203 of the DGCL do not apply if:

Limitation on Liability of Directors and Indemnification

Our restated certificate of incorporation provides that our directors will not be personally liable to us or our stockholders for monetary damages for any breach of fiduciary duty as a director, except to the extent such exemption from liability or limitation is not permitted under the DGCL, as may be amended. The DGCL provides that the certificate of incorporation may not eliminate or limit the liability of a director:

Our amended and restated bylaws provide that we must indemnify our directors and officers to the fullest extent permitted by law. We are also expressly authorized to advance certain expenses (including attorneys’ fees) to our directors and officers and carry directors’ and officers’ insurance providing indemnification for our directors and officers for some liabilities. We believe that these indemnification provisions and insurance are useful to attract and retain qualified directors and executive officers. In addition, we have entered into separate indemnification agreements with each of our directors and executive officers.

Registration Rights

We are party to an amended and restated investors’ rights agreement that provides that certain holders of our capital stock have certain registration rights as set forth below. The registration of shares of our Class A common stock by the exercise of registration rights described below would enable the holders to sell these shares without restriction under the Securities Act when the applicable registration statement is declared effective.

The registration rights set forth in the amended and restated investors’ rights agreement will terminate (i) on September 21, 2026 or (ii) with respect to any particular stockholder, the earliest of when such stockholder is able to sell all of its shares pursuant to Rule 144(b)(1)(i) of the Securities Act or holds 1% or less of our outstanding Class A common stock, which includes shares of Class B common stock convertible into Class A common stock, and is able to sell all of its registrable shares pursuant to Rule 144 of the Securities Act during any three month period. We will pay the registration expenses (other than underwriting discounts and commissions) of the holders of the shares registered pursuant to the registrations described below, including the reasonable fees of one counsel for the selling holders. In an underwritten offering, the underwriters have the right, subject to specified conditions, to limit the number of shares such holders may include.

Demand Registration Rights

Certain holders of our Class A common stock and Class B common stock are entitled to certain demand registration rights. At any time beginning six months after the effectiveness of the registration statement related to our Direct Listing, holders of at least 50% of these shares of registrable securities can request that we register the offer and sale of their shares. We are obligated to effect only one such registration. Such request for registration must cover securities the anticipated aggregate offering price of which is at least $15.0 million. We will not be required to effect a demand registration during the period beginning 60 days prior to our good faith estimate of the date of the filing of, and ending on a date 180 days following the effectiveness of, a registration statement relating to the public offering of our Class A common stock. If we determine that it would be seriously detrimental to us and our stockholders to effect such a demand registration, we have the right to defer such registration, not more than once in any 12-month period, for a period of up to 90 days.

Piggyback Registration Rights

In the event that we propose to register any of our securities under the Securities Act, either for our own account or for the account of other security holders, certain holders of our Class A common stock and Class B common stock are entitled to certain “piggyback” registration rights allowing the holders to include their shares in such registration, subject to certain marketing and other limitations. As a result, whenever we propose to file a registration statement under the Securities Act, other than with respect to (i) a demand registration, (ii) a registration relating solely to the sale of securities of participants in our stock plan, (iii) a registration relating to a corporate reorganization or transaction under Rule 145 of the Securities Act, (iv) a registration on any registration form that does not include substantially the same information as would be required to be included in a registration statement covering the sale of such shares, or (v) a registration in which the only shares being registered are shares issuable upon conversion of debt securities that are also being registered, the holders of such shares are entitled to notice of the registration and have the right, subject to certain limitations, to include their shares in the registration.

S-3 Registration Rights

Certain holders of our Class A common stock and Class B common stock are entitled to certain Form S-3 registration rights. The holders of at least 30% of these shares then outstanding may make a request that we register the offer and sale of their shares on a registration statement on Form S-3, if we are eligible to file a registration statement on Form S-3 and so long as the request covers securities the anticipated aggregate public offering price of which is at least $10.0 million, net of any underwriters’ discounts, or commissions. These stockholders may make an unlimited number of requests for registration on Form S-3; however, we will not be required to effect a registration on Form S-3 if we have effected two such registrations within the 12-month period preceding the date of the request. Additionally, if we determine that it would be seriously detrimental to us and our stockholders to effect such a registration, we have the right to defer such registration, not more than once in any 12-month period, for a period of up to 90 days.

Transfer Agent and Registrar

The transfer agent and registrar for our Class A common stock and Class B common stock is American Stock Transfer & Trust Company, LLC. The transfer agent and registrar’s address is 6201 15th Avenue, Brooklyn, New York 11219, and its telephone number is ###-###-####.

Listing

Our Class A common stock is listed on the Nasdaq Capital Market under the symbol “AMPL.”