LPL Financial (LPLA) 10-Q 2018 Q1 Quarterly report

Exhibit 32.1

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 Quarterly Report on Form 10-Q of LPL Financial Holdings Inc. (the “Company”) for the period ending March 31, 2018 as filed with the Securities and Exchange Commission (“SEC”) on the date hereof (the “Report”), I, Dan H. Arnold, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that:

1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; 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 has been provided to the Company and will be retained by the Company and furnished to the SEC or its staff upon request.

Date: May 4, 2018

/s/ Dan H. Arnold

Dan H. Arnold

President and Chief Executive Officer