Exhibit 99.1

AMENDMENT
TO THE
AMENDED AND RESTATED
CERTIFICATE OF INCORPORATION
OF
NEBULA ACQUISITION CORPORATION

January 9, 2020

Nebula Acquisition Corporation, a corporation organized and existing under the laws of the State of Delaware (the “Corporation”), DOES HEREBY CERTIFY AS FOLLOWS:

1. The name of the Corporation is “Nebula Acquisition Corporation” The original certificate of incorporation of the Corporation was filed with the Secretary of State of the State of Delaware on October 2, 2017 (the “Original Certificate”). The Amended and Restated Certificate of Incorporation (the “Amended and Restated Certificate”) was filed with the Secretary of State of the State of Delaware on January 9, 2018;

2. This Amendment to the Amended and Restated Certificate of Incorporation amends the Amended and Restated Certificate.

3. This Amendment to the Amended and Restated Certificate of Incorporation was duly adopted by the Board of Directors of the Corporation and the stockholders of the Corporation in accordance with Section 242 of the General Corporation Law of the State of Delaware.

4. The text of Section 9.1(b) of Article IX is hereby amended and restated to read in full as follows:

(b) Immediately after the Offering, a certain amount of the net offering proceeds received by the Corporation in the Offering (including the proceeds of any exercise of the underwriters’ over-allotment option) and certain other amounts specified in the Corporation’s registration statement on Form S-1, as initially filed with the Securities and Exchange Commission on December 12, 2017, as amended (the “Registration Statement”), shall be deposited in a trust account (the “Trust Account”), established for the benefit of the Public Stockholders (as defined below) pursuant to a trust agreement described in the Registration Statement. Except for the withdrawal of interest to pay franchise and income taxes and up to $500,000 to fund working capital requirements, none of the funds held in the Trust Account (including the interest earned on the funds held in the Trust Account) will be released from the Trust Account until the earliest to occur of (i) the completion of the initial Business Combination, (ii) the redemption of 100% of the Offering Shares (as defined below) if the Corporation is unable to complete its initial Business Combination by June 12, 2020, (iii) the redemption of 100% of the Offering Shares if the Corporation has not executed a definitive agreement for the initial Business Combination by February 12, 2020 or upon the termination of such agreement, or (iv) the redemption of shares in connection with a vote seeking to amend any provisions of this Amended and Restated Certificate relating to stockholders’ rights or pre-initial Business Combination activity (as described in Section 9.7). Holders of shares of the Common Stock included as part of the units sold in the Offering (the “Offering Shares”) (whether such Offering Shares were purchased in the Offering or in the secondary market following the Offering and whether or not such holders are Nebula Holdings, LLC (the “Sponsor”) or officers or directors of the Corporation, or affiliates of any of the foregoing) are referred to herein as “Public Stockholders.”

5. The text of Section 9.2(d) of Article IX is hereby amended and restated to read in full as follows:

(d) In the event that (x) the Corporation has not entered into a definitive agreement for an initial Business Combination by February 12, 2020, (y) such agreement is subsequently terminated or (z)the Corporation has not consummated an initial Business Combination by June 12, 2020, the Corporation shall (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter subject to lawfully available funds therefor, redeem 100% of the Offering Shares in consideration of a per-share price, payable in cash, equal to the quotient obtained by dividing (A) the aggregate amount then on deposit in the Trust Account, including interest not previously released to the Corporation to pay its taxes and up to $500,000 to fund working capital requirements (less up to $100,000 of such net interest to pay dissolution expenses), by (B) the total number of then outstanding Offering Shares, which redemption will completely extinguish rights of the Public Stockholders (including the right to receive further liquidating distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining stockholders and the Board in accordance with applicable law, dissolve and liquidate, subject in each case to the Corporation’s obligations under the DGCL to provide for claims of creditors and other requirements of applicable law.

6. The text of Section 9.7 of Article IX is hereby amended and restated to read in full as follows:

Section 9.7 Additional Redemption Rights. If, in accordance with Section 9.1(a), any amendment is made to Section 9.2(d) to modify the substance or timing of the Corporation’s obligation to redeem 100% of the Offering Shares if (x) the Corporation has not entered into a definitive agreement for an initial Business Combination by February 12, 2020, (y) such agreement is subsequently terminated or (z) the Corporation has not consummated an initial Business Combination by June 12, 2020, the Public Stockholders shall be provided with the opportunity to redeem their Offering Shares upon the approval of any such amendment, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest not previously released to the Corporation to pay its taxes and up to $500,000 to fund working capital requirements, divided by the number of then outstanding Offering Shares. The Corporation’s ability to provide such opportunity is subject to the Redemption Limitation.

IN WITNESS WHEREOF, Nebula Acquisition Corporation has caused this Amendment to the Amended and Restated Certificate to be duly executed in its name and on its behalf by an authorized officer as of the date first set above.