<PAGE>

                                                                    Exhibit 31.2

                                  CERTIFICATION

I, Steven C. Jacobs, certify that:

1.       I have reviewed this amendment to quarterly report on Form 10-QSB of
         Summit Brokerage Services, Inc.;

2.       Based on my knowledge, this amended report does not contain any untrue
         statement of a material fact or omit to state a material fact necessary
         to make the statements made, in light of the circumstances under which
         such statements were made, not misleading with respect to the period
         covered by this amended report;

3.       Based on my knowledge, the financial statements, and other financial
         information included in this amended report, fairly present in all
         material respects the financial condition, results of operations and
         cash flows of the registrant as of, and for, the periods presented in
         this amended report;

4.       The registrant's other certifying officer(s) and I are responsible for
         establishing and maintaining disclosure controls and procedures (as
         defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
         registrant and have:

                  a)       Designed such disclosure controls and procedures, or
                  caused such disclosure controls and procedures to be designed
                  under our supervision, to ensure that material information
                  relating to the registrant, including its consolidated
                  subsidiaries, is made known to us by others within those
                  entities, particularly during the period in which this amended
                  report is being prepared;

                  b)       Evaluated the effectiveness of the registrant's
                  disclosure controls and procedures and presented in this
                  amended report our conclusions about the effectiveness of the
                  disclosure controls and procedures, as of the end of the
                  period covered by this amended report based on such
                  evaluation; and

                  c)       Disclosed in this amended report any change in the
                  registrant's internal control over financial reporting that
                  occurred during the registrant's most recent fiscal quarter
                  (the registrant's fourth fiscal quarter in the case of an
                  annual report) that has materially affected, or is reasonably
                  likely to materially affect, the registrant's internal control
                  over financial reporting; and

5.       The registrant's other certifying officer(s) and I have disclosed,
         based on our most recent evaluation of internal control over financial
         reporting, to the registrant's auditors and the audit committee of the
         registrant's board of directors (or persons performing the equivalent
         functions):

                  a)       All significant deficiencies and material weaknesses
                  in the design or operation of internal control over financial
                  reporting which are reasonably likely to adversely affect the
                  registrant's ability to record, process, summarize and report
                  financial information; and

                  b)       Any fraud, whether or not material, that involves
                  management or other employees who have a significant role in
                  the registrant's internal control over financial reporting.

Date: February 6, 2004

                                         /s/ Steven C. Jacobs
                                         ---------------------------------------
                                         Steven C. Jacobs
                                         Executive Vice President and Chief
                                         Financial Officer