Exhibit 32.1
INSIGHT ENTERPRISES, INC.
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
In connection with the Annual Report of Insight Enterprises, Inc. (the
“Company”) on Form
10-K for the period ended
December 31, 2009 as filed with the Securities and Exchange Commission
on the date hereof (the
“Report”), we,
Kenneth T. Lamneck, Chief Executive Officer of the
Company, and
Glynis A. Bryan, Chief Financial Officer of
the Company, certify, pursuant to 18
U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to the best of
our knowledge:
(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934; and
(2) The information contained in the Report fairly presents, in all material respects, the
financial condition and results of operations of
the Company.
A signed original of this written statement required by Section 906, or other document
authenticating, acknowledging, or otherwise adopting the signatures that appear in typed form
within the electronic version of this written statement required by Section 906, has been provided
to Insight Enterprises, Inc. and will be retained by Insight Enterprises, Inc. and furnished to the
Securities and Exchange Commission or its staff upon request.
