The remainder of this cover page shall be filled out for 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 the disclosures provided in a prior cover page.

Names of Reporting Persons.

I.R.S. Identification Nos. of above persons (entities only)

Vlad Vendrow

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)  ☐        (b)  ☐

SEC Use Only

Citizenship or Place of Organization

United States

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

Sole Voting Power

3,103,970 (1)(2)(3)

Shared Voting Power

0

Sole Dispositive Power

3,103,970 (1)(2)(3)

Shared Dispositive Power

0

Aggregate Amount Beneficially Owned by Each Reporting Person

3,103,970 (1)(2)(3)

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

Percent of Class Represented by Amount in Row (9)

4.3% (2)(3)(4)

Type of Reporting Person (See Instructions)

IN

Consists of (i) 2,912,995 shares of Class B Common Stock and (ii) 190,975 shares of Class A Common Stock.

Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (i) the date specified by affirmative vote or written consent of the holders of at least 67% of the outstanding shares of Class B Common Stock or (ii) any transfer, whether or not for value, except for certain transfers described in our certificate of incorporation, including, without limitation, transfers for tax and estate planning purposes, so long as the transferring holder of Class B Common Stock continues to hold exclusive voting and dispositive power with respect to the shares transferred. The Class B Common Stock will convert automatically into Class A Common Stock on the date on which the number of outstanding shares of Class B Common Stock represents less than 10% of the aggregate combined number of outstanding shares of Class A Common Stock and Class B Common Stock. The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights (noted above) and voting rights. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

Assumes conversion of all such reporting person’s Class B Common Stock into Class A Common Stock.

Based on the quotient obtained by dividing (a) the aggregate number of shares of Class A Common Stock and Class B Common Stock beneficially owned by the Reporting Person as set forth in Row 9 by (b) the sum of (i) 69,444,695 shares of Class A Common Stock outstanding as of December 31, 2018, as reported by the Issuer to the Reporting Person, and (ii) the aggregate number of shares of Class B Common Stock beneficially owned by the Reporting Person, (iii) 6,742 shares of Class A Common Stock underlying restricted stock units subject to a restricted stock agreement that are scheduled to vest within 60 days of December 31, 2018 and (iii) 120,000 shares of Class A Common Stock issuable pursuant to stock options exercisable within 60 days of December 31, 2018. The aggregate number of shares of Class B Common Stock beneficially owned by the Reporting Person as set forth in clauses “(a)” and “(b)” of this footnote are treated as converted into Class A Common Stock only for the purpose of computing the percentage ownership of the Reporting Person.

Names of Reporting Persons.

I.R.S. Identification Nos. of above persons (entities only)

The Vlad Vendrow Trust dated March 13, 2007

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)  ☐        (b)  ☐

SEC Use Only

Citizenship or Place of Organization

United States

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

Sole Voting Power

2,789,965 (1)(2)(3)

Shared Voting Power

0

Sole Dispositive Power

2,789,965 (1)(2)(3)

Shared Dispositive Power

0

Aggregate Amount Beneficially Owned by Each Reporting Person

2,789,965 (1)(2)(3)

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

Percent of Class Represented by Amount in Row (9)

3.9%(2)(3)(4)

Type of Reporting Person (See Instructions)

OO

Consists of (i) 2,729,965 shares of Class B Common Stock and (ii) 60,000 shares of Class A Common Stock.

Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (i) the date specified by affirmative vote or written consent of the holders of at least 67% of the outstanding shares of Class B Common Stock or (ii) any transfer, whether or not for value, except for certain transfers described in our certificate of incorporation, including, without limitation, transfers for tax and estate planning purposes, so long as the transferring holder of Class B Common Stock continues to hold exclusive voting and dispositive power with respect to the shares transferred. The Class B Common Stock will convert automatically into Class A Common Stock on the date on which the number of outstanding shares of Class B Common Stock represents less than 10% of the aggregate combined number of outstanding shares of Class A Common Stock and Class B Common Stock. The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights (noted above) and voting rights. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

Assumes conversion of all such reporting person’s Class B Common Stock into Class A Common Stock.

Based on the quotient obtained by dividing (a) the aggregate number of shares of Class A Common Stock and Class B Common Stock beneficially owned by the Reporting Person as set forth in Row 9 by (b) the sum of (i) 69,444,695 shares of Class A Common Stock outstanding as of December 31, 2018, as reported by the Issuer to the Reporting Person, and (ii) the aggregate number of shares of Class B Common Stock beneficially owned by the Reporting Person. The aggregate number of shares of Class B Common Stock beneficially owned by the Reporting Person as set forth in clauses “(a)” and “(b)” of this footnote are treated as converted into Class A Common Stock only for the purpose of computing the percentage ownership of the Reporting Person.

Name of Issuer:

Address of Issuer’s Principal Executive Offices:

Name of Person Filing:

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

Citizenship:

Title of Class of Securities:

CUSIP Number:

If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or (c), check whether the person filing is a:

Ownership.

(a) Amount beneficially owned:

(b) Percent of class:

(c) Number of shares as to which person has:

(i) Sole power to vote or to direct the vote

(ii) Shared power to vote or to direct the vote

(iii) Sole power to dispose or to direct the disposition of

(iv) Shared power to dispose or to direct the disposition of

(a) Amount beneficially owned:

(b) Percent of class:

(c) Number of shares as to which person has:

(i) Sole power to vote or to direct the vote

(ii) Shared power to vote or to direct the vote

(iii) Sole power to dispose or to direct the disposition of

(iv) Shared power to dispose or to direct the disposition of

Ownership of Five Percent or Less of a Class.

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

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

Identification and Classification of Members of the Group.

Notice of Dissolution of Group.

Certifications.