Exhibit 3.1

SECOND

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

AQUANTIA CORP.

SEPTEMBER 19, 2019

ARTICLE I

The name of the Corporation is: Aquantia Corp. (the “Corporation”).

ARTICLE II

The address of the Corporation’s registered office in the State of Delaware is 251 Little Falls Drive, in the City of Wilmington, County of New Castle, Delaware, 19808. The name of its registered agent at such address is: Corporation Service Company.

ARTICLE III

The nature of the business and the purposes to be conducted and promoted by the Corporation are to conduct any lawful business, to promote any lawful purpose and to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the “DGCL”).

ARTICLE IV

1. The total number of shares of stock which the Corporation shall have authority to issue is one thousand (1,000) shares of common stock, $0.0001 par value per share (the “Common Stock”).

2. Shares of the Common Stock may be issued from time to time as the Board of Directors of the Corporation (the “Board”) shall determine and on such terms and for such consideration as shall be fixed by the Board. The amount of the authorized Common Stock of the Corporation may be increased or decreased by the affirmative vote of the holders of a majority of the outstanding shares of Common Stock of the Corporation entitled to vote.

ARTICLE V

Elections of directors need not be by written ballot unless required by the Bylaws of the Corporation. Any director may be removed from office either with or without cause at any time by the affirmative vote of the holders of a majority of the outstanding Common Stock of the Corporation entitled to vote, given at a meeting of the stockholders called for that purpose, or by the consent of the holders of a majority of the outstanding Common Stock of the Corporation entitled to vote, given in accordance with DGCL Section 228.

ARTICLE VI

In furtherance and not in limitation of the powers conferred upon the Board by law, the Board shall have the power to make, adopt, alter, amend and repeal from time to time the Bylaws of the Corporation subject to the right of the stockholders entitled to vote with respect thereto to alter, amend and repeal Bylaws made by the Board.

ARTICLE VII

The liability of the directors of the Corporation for monetary damages shall be eliminated to the fullest extent under applicable law. To the fullest extent permitted by applicable law, the Corporation is authorized to provide indemnification of (and advancement of expenses to) directors, officers and agents of the Corporation (and any other persons to which applicable law permits the Corporation to provide indemnification) through Bylaw provisions, agreements with such directors, officers, agents or other persons, vote of stockholders or disinterested directors or otherwise in excess of the indemnification and advancement otherwise permitted by such applicable law. If applicable law is amended after approval by the stockholders of this Article VII to authorize corporate action further eliminating or limiting the personal liability of directors, then the liability of a director to the Corporation shall be eliminated or limited to the fullest extent permitted by applicable law as so amended. Any repeal or modification of this Article VII shall only be prospective and shall not affect the rights or protections or increase the liability of any director under this Article VII in effect at the time of the alleged occurrence of any act or omission to act giving rise to liability or indemnification.

AQUANTIA CORP 8-K