SC 13G 1 ea134371-13gfirst_firstmark.htm SCHEDULE 13G

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

(Amendment No. __)*

Under the Securities Exchange Act of 1934

FirstMark Horizon Acquisition Corp.

(Name of Issuer)

Class A Common Stock, par value $0.0001 per share

(Titles of Class of Securities)

33765Y 101

(CUSIP Number)

December 31, 2020

(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)

* The remainder of this cover page shall be filled out of a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

1	NAME OF REPORTING PERSON FirstMark Horizon Sponsor LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 10,230,000 (1)
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 10,230,000 (1)

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,230,000 (1)
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 19.8% (2)
12	TYPE OF REPORTING PERSON OO

(1)

Reflects 10,230,000 shares of Class A common stock of FirstMark Horizon Acquisition Corp. (the “Company”), par value $0.0001 per share (“Class A Common Stock”), issuable upon conversion of 10,230,000 shares of Class B common stock of the Company, par value $0.0001 per share (“Class B Common Stock”). The Class B Common Stock will automatically convert into Class A Common Stock at the time of the Company’s initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment. FirstMark Horizon Sponsor LLC (the “Sponsor”) is the record holder of the shares reported herein. Richard Heitzmann and Amish Jani are managing members of the Sponsor. As such, each of the foregoing may be deemed to have or share beneficial ownership of the shares of Class B Common Stock held directly by the Sponsor.

(2)

The calculation assumes that there is a total of 51,750,000 shares of Class A Common Stock outstanding, which is the sum of (i) the 41,400,000 shares of Class A Common Stock outstanding as of November 18, 2020, as reported in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2020 (the “Report”), and (ii) the 10,350,000 shares of Class A Common Stock issuable upon conversion of the shares of Class B Common Stock reported in the Report.

1	NAME OF REPORTING PERSON Richard Heitzmann
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 10,230,000 (1)
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 10,230,000 (1)

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,230,000 (1)
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 19.8% (2)
12	TYPE OF REPORTING PERSON OO

(1)

Reflects 10,230,000 shares of Class A Common Stock issuable upon conversion of 10,230,000 shares of Class B Common Stock. The Class B Common Stock will automatically convert into Class A Common Stock at the time of the Company’s initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment. The Sponsor is the record holder of the shares reported herein. Richard Heitzmann and Amish Jani are managing members of the Sponsor. As such, each of the foregoing may be deemed to have or share beneficial ownership of the shares of Class B Common Stock held directly by the Sponsor.

(2)

The calculation assumes that there is a total of 51,750,000 shares of Class A Common Stock outstanding, which is the sum of (i) the 41,400,000 shares of Class A Common Stock outstanding as of November 18, 2020, as reported in the Report, and (ii) the 10,350,000 shares of Class A Common Stock issuable upon conversion of the shares of Class B Common Stock as reported in the Report.

1	NAME OF REPORTING PERSON Amish Jani
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 10,230,000 (1)
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 10,230,000 (1)

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,230,000 (1)
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 19.8% (2)
12	TYPE OF REPORTING PERSON OO

(1)

(2)

The calculation assumes that there is a total of 51,750,000 shares of Class A Common Stock outstanding, which is the sum of (i) the 41,400,000 shares of Class A Common Stock outstanding as of November 18, 2020, as reported in the Report, and (ii) the 10,350,000 shares of Class A Common Stock issuable upon conversion of the shares of Class B Common Stock as reported in the Report.

Item 1(a).

Name of Issuer:

FirstMark Horizon Acquisition Corp.

Item 1(b).

Address of Issuer’s Principal Executive Offices:

100 5th Ave, 3rd Floor, New York, New York 10011

Item 2(a).

Name of Person Filing:

This statement is being filed jointly pursuant to §240.13d-1(k)(1) on behalf of each of the following persons (collectively, the “Reporting Persons”):

FirstMark Horizon Sponsor LLC

Richard Heitzmann

Amish Jani

Item 2(b).

Address of Principal Business Office or, if none, Residence:

The principal business address of each of the Reporting Persons is as follows:

100 5th Ave, 3rd Floor, New York, New York 10011

Item 2(c).

Citizenship:

See responses to Item 4 on each cover page.

Item 2(d).

Titles of Classes of Securities:

Class A Common Stock, par value $0.0001 per share

Item 2(e).

CUSIP Number:

The Class A Common Stock CUSIP Number is 33765Y 101.

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 Exchange Act (15 U.S.C. 78o).

(b)	☐	Bank as defined in Section 3(a)(6) of the Exchange Act (15 U.S.C. 78c).

(c)	☐	Insurance company as defined in Section 3(a)(19) of the Exchange 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)	☐	Investment adviser in accordance with §240.13d-1(b)(1)(ii)(E).

(f)	☐	Employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F).

(g)	☐	Parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G).

(h)	☐	Savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813).

(i)	☐	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)	☐	Non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J).

(k)	☐	Group in accordance with §240.13d-1(b)(1)(ii)(K).
If filing as a non-U.S. institution in accordance with §240. 13d-1(b)(1)(ii)(J), please specify the type of institution: ______________ .

Item 4.

Ownership

(a)

Amount beneficially owned:

See responses to Item 9 on each cover page.

(b)

Percent of class:

See responses to Item 11 on each cover page.

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote:

See responses to Item 5 on each cover page.

(ii)

Shared power to vote or to direct the vote:

See responses to Item 6 on each cover page.

(iii)

Sole power to dispose or to direct the disposition of:

See responses to Item 7 on each cover page.

(iv)

Shared power to dispose or to direct the disposition of:

See responses to Item 8 on each cover page.

Item 5.

Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ☐.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

None.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

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.

Certification.

Not Applicable.

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.

Dated: February 2, 2021

FirstMark Horizon Sponsor LLC

	By:	/s/ Richard Heitzmann
		Name: Richard Heitzmann
		Title: Chief Executive Officer

Richard Heitzmann

By:

/s/ Richard Heitzmann

Amish Jani

By:

/s/ Amish Jani

Exhibit Index

Exhibit 1

Agreement of Joint Filing as required by Rule 13d-1(k)(1) under the Act.