Exhibit 31.2


                     CHIEF FINANCIAL OFFICER CERTIFICATION

I, Steven Novik, certify that:

1.     I have reviewed this annual report on Form 10-K of The Jones Financial
       Companies, L.L.L.P.

2.     Based on my knowledge, this annual 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 annual report.

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

4.     The Partnership's other certifying officer 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)) and internal
       control over financial reporting (as defined in Exchange Act Rules
       13a-15(f) and 15d-15(f)) for the Partnership 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
            Partnership, including its consolidated subsidiaries, is made
            known to us by others within those entities, particularly during
            the period in which this annual report is being prepared;

       b)   Designed such internal control over financial reporting, or caused
            such internal control over financial reporting to be designed
            under our supervision, to provide reasonable assurance regarding
            the reliability of financial reporting and the preparation of
            financial statements for external purposes in accordance with
            generally accepted accounting principles;

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

       d)   Disclosed in this report any change in the Partnership's internal
            control over financial reporting that occurred during the
            Partnership's fourth quarter that has materially affected, or is
            reasonable likely to materially affect, the Partnership's internal
            control over financial reporting; and

5.     The Partnership's other certifying officer and I have disclosed, based
       on our most recent evaluation of internal control over financial
       reporting, to the Partnership's auditors and the Executive Committee:

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

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


                                       /s/ Steven Novik
                                       ----------------------------------------
                                       Chief Financial Officer
                                       The Jones Financial Companies, L.L.L.P.
                                       March 28, 2008