SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

RULE 13d-2(a)

(Amendment No. 1)

PC CONNECTION, INC.

(Name of Issuer)

Common Stock par value $.01 per share

(Title of Class of Securities)

69318J100

(CUSIP Number)

Patricia Gallup

David Hall

1998 PC Connection Voting Trust

PC Connection, Inc.

Rt. 101A, 730 Milford Road

Merrimack, New Hampshire 03054

(603) 683-2000

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

December 17, 2012

(Date of Event, Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rules 13d-1(e), 13d-1(f), or 13d-1(g), check the following box.  ¨

This Amendment No. 1 (“Amendment No. 1”) amends the statement on Schedule 13D initially filed on April 23, 2004 (the “Original Filing”) by Patricia Gallup, David Hall and the 1998 PC Connection Voting Trust (collectively, the “Reporting Parties”) with respect to common stock, par value $0.01 per share (the “Common Stock”), of PC Connection, Inc., a Delaware corporation (the “Issuer”). Capitalized terms used and not defined in this Amendment No. 1 have the meanings set forth in the Original Filing. This Amendment No. 1 is being made to disclose the disposition of securities of the Issuer. Except as otherwise set forth herein, this Amendment No. 1 does not modify any of the information previously reported by the Reporting Parties in the Original Filing.

Item 2. Identity and Background.

Item 2 of the Original Filing is hereby amended and restated in its entirety as follows:

(a) - (f) This Schedule is filed on behalf of Patricia Gallup, with a principal place of business and principal office located at Rt. 101A, 730 Milford Road Merrimack, New Hampshire 03054. The principal occupation of Ms. Gallup is Chairman of the Board of Directors and Chief Administrative Officer of the Issuer. During the last five years, Ms. Gallup has not been convicted in a criminal proceeding (excluding traffic violations and similar misdemeanors). During the last five years, Ms. Gallup has not been a party to any civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which such proceeding was or is subject to a judgment, decree, or final order enjoining future violation of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. Ms. Gallup is a US citizen.

This Schedule is filed on behalf of David Hall, with a principal place of business and principal office located at Rt. 101A, 730 Milford Road Merrimack, New Hampshire 03054. The principal occupation of Mr. Hall is as a Business Analyst for the Issuer and a member of the Board of Directors of the Issuer. During the last five years, Mr. Hall has not been convicted in a criminal proceeding (excluding traffic violations and similar misdemeanors). During the last five years, Mr. Hall has not been a party to any civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which such proceeding was or is subject to a judgment, decree, or final order enjoining future violation of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. Mr. Hall is a US citizen.

This Schedule is filed on behalf of the 1998 PC Connection Voting Trust, with a principal place of business and principal office located at Rt. 101A, 730 Milford Road Merrimack, New Hampshire 03054. During the last five years, the 1998 PC Connection Voting Trust has not been a party to any civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which such proceeding was or is subject to a judgment, decree, or final order enjoining future violation of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. The 1998 PC Connection Voting Trust is governed by US law.

Item 5. Interest in Securities of the Issuer.

The percentages below are based on 25,934,074 shares of Common Stock outstanding on January 31, 2013.

(a)-(b)

Ms. Gallup beneficially owns 8,399,094 shares of Common Stock, representing 32.4% of Common Stock as of the date of filing this statement. This amount includes 15,000 shares of Common Stock held by Ms. Gallup’s spouse, as to which Ms. Gallup disclaims beneficial ownership. Ms. Gallup has the sole power to vote or direct the vote of 515,000 shares; Ms. Gallup has the shared power to vote or direct the vote of 15,753,188 shares; Ms. Gallup has the sole power to dispose or direct the disposition as to 8,384,094 shares; and Ms. Gallup has the shared power to dispose or direct the dispostion as to 15,000 shares.

Mr. Hall beneficially owns 7,968,789 shares of Common Stock, representing 30.7% of Common Stock as of the date of filing this statement. Mr. Hall has sole power to vote or direct the vote as to 99,695 shares; Mr. Hall has the shared power to vote or direct the vote as to 15,738,188 shares; and Mr. Hall has the sole power to dispose or direct the disposition as to 7,968,789 shares.

The 1998 PC Connection Voting Trust has the shared power to vote or direct the vote of 15,738,188 shares of Common Stock, representing 60.7% of Common Stock as of the date of filing this statement.

(c) See Schedule 5(c) attached hereto.

(d) None.

(e) Not applicable.

Item 6. Contracts, Arrangements, Understandings, or Relationships With Respect to Securities of the Issuer.

Item 6 is hereby amended to add the following paragraph to the end:

On December 14, 2012, Ms. Gallup and Mr. Hall entered into a Stock Purchase Agreement with the Issuer, pursuant to which the Issuer bought back 300,000 shares of Common Stock from each of Ms. Gallup and Mr. Hall at a price per share of $10.578, which is based on the volume weighted-average share price of the Issuer’s stock for the fifteen trading days ended December 13, 2012.

Item 7. Material to be Filed as Exhibits. The following documents are filed as exhibits to this statement:

SIGNATURES

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.

EXHIBIT INDEX

Schedule 5(c)

The following are transactions effected by the Reporting Persons in the last sixty 60 days:

On December 14, 2012, Ms. Gallup entered into a Stock Purchase Agreement with the Issuer, pursuant to which the Issuer purchased 300,0000 shares of Common Stock from Ms. Gallup at a price per share of $10.578, which is based on the volume weighted-average share price of the Issuer’s stock for the fifteen trading days ended December 13, 2012.

On December 14, 2012, Mr. Hall entered into a Stock Purchase Agreement with the Issuer, pursuant to which the Issuer purchased 300,0000 shares of Common Stock from Mr. Hall at a price per share of $10.578, which is based on the volume weighted-average share price of the Issuer’s stock for the fifteen trading days ended December 13, 2012.

On December 7, 2012, Mr. Hall gifted 25,000 shares of Common Stock to a charity that operates on land and in a building owned by Mr. Hall. The charity sold some of these shares as set forth below:

Exhibit 1

AGREEMENT

Pursuant to Rule 13d-1(k), promulgated under the Securities Exchange Act of 1934, the undersigned persons hereby agree to file with the Securities and Exchange Commission this Statement on Schedule 13D (the “Statement”) to which this Joint Filing Agreement (the “Agreement”) is attached as an exhibit and any future amendments thereto, and agree that such Statement is filed on behalf of each of them.

EXECUTED as a sealed instrument this 11th day of February 2013.