Filing Details

Names of Reporting Person

Edward W. Stack

Check the Appropriate Box If A Member of A Group

(a)  ☐        (b)  ☐

SEC Use Only

Citizenship or Place of Organization:

Pennsylvania

Number Of

Shares

Beneficially

Owned By

Each

Reporting

Person

With

Sole Voting Power

20,723,508¹

Shared Voting Power

0

Sole Dispositive Power

16,359,931²

Shared Dispositive Power

Aggregate Amount Beneficially Owned By Each Reporting Person

Edward W. Stack - 20,723,508^{1, 2}

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

Not Applicable.

Percent of Class Represented By Amount in Row 9

22.1%

Type of Reporting Person (See Instructions)

IN

Represents 880,813 shares of common stock and 3,175,000 shares of Class B common stock beneficially owned by Mr. Stack, 372,947 shares of common stock and 3,990,630 shares of Class B common stock for which Mr. Stack maintains sole voting, but not dispositive power (see footnote 2), and 412,371 shares of common stock subject to options that are currently exercisable, or that will become exercisable, within 60 days of December 31, 2018. Amount also includes: (i) 1,547,748 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust V, (ii) 950,333 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust VI, (iii) 1,737,833 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust VII, (iv) 2,199,834 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust VIII, and (v) 5,455,999 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust IX, for which Mr. Stack retains sole voting and dispositive power as trustee.

Pursuant to the terms of a Memorandum of Understanding dated March 2, 2009 (MOU) and Voting Agreement and Proxy dated October 13, 2009 (Voting Agreement), Mr. Stack has sole voting power, but not dispositive power, with respect to 3,990,630 shares of Class B common stock owned directly or indirectly by Mr. Stacks former spouse. Edward W. Stack also owns 372,947 shares of restricted common stock, of which (i) 111,489 shares vest in April 2019, (ii) 50,948 shares vest in April 2020 upon achievement of maximum performance targets, (iii) 106,990 shares vest in April 2020, and (iv) 103,520 shares vest in April 2021. Until the shares of restricted stock vest, they may be voted, but may not be sold or otherwise transferred.

Name of Issuer:

Address of Issuers Principal Executive Offices:

Name of Person Filing:

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

Citizenship:

Title of Class of Securities: Common Stock, par value $.01 per share. Mr. Stack also is the beneficial owner of Class B common stock, see footnotes 1 and 2.

CUSIP Number: 253393102

If this statement is being filed pursuant to §§ 240.13d-1(b) or 240,13d-2(b) or (c), check whether the person filing is a: Not applicable.

Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o);

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

Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c);

Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);

An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act (15 U.S.C. 80a-3);

A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J);

Group, in accordance with § 240.13d-1(b)(1)(ii)(K).

Ownership

Represents 880,813 shares of common stock and 3,175,000 shares of Class B common stock beneficially owned by Mr. Stack, 372,947 shares of common stock and 3,990,630 shares of Class B common stock for which Mr. Stack maintains sole voting, but not dispositive power (see footnote 2), and 412,371 shares of common stock subject to options that are currently exercisable, or that will become exercisable, within 60 days of December 31, 2018. Amount also includes: (i) 1,547,748 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust V, (ii) 950,333 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust VI, (iii) 1,737,833 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust VII, (iv) 2,199,834 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust VIII, and (v) 5,455,999 shares of Class B common stock owned by the Edward W. Stack Grantor Retained Annuity Trust IX, for which Mr. Stack retains sole voting and dispositive power as trustee.

Pursuant to the terms of a Memorandum of Understanding dated March 2, 2009 (MOU) and Voting Agreement and Proxy dated October 13, 2009 (Voting Agreement), Mr. Stack has sole voting power, but not dispositive power, with respect to 3,990,630 shares of Class B common stock owned directly or indirectly by Mr. Stacks former spouse. Edward W. Stack also owns 372,947 shares of restricted common stock, of which (i) 111,489 shares vest in April 2019, (ii) 50,948 shares vest in April 2020 upon achievement of maximum performance targets, (iii) 106,990 shares vest in April 2020 and (iv) 103,520 shares vest in April 2021. Until the shares of restricted stock vest, they may be voted, but may not be sold or otherwise transferred.

Ownership of Five Percent or Less of a Class.

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

Identification and Classification of 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 the Group.

Certifications.