Exhibit 99.1350CERT

         Certification Pursuant to Rule 30a-2(b) under the 1940 Act and
                      Section 906 of the Sarbanes Oxley Act

Pursuant to 18 U.S.C.  Section 1350, the undersigned  officer of Master Extended
Market Index Series of Quantitative Master Series LLC (the "Registrant"), hereby
certifies,  to the best of his knowledge,  that the Registrant's  Report on Form
N-CSR for the period ended December 31, 2007, (the "Report") fully complies with
the  requirements  of Section 15(d) of the  Securities  Exchange Act of 1934, as
amended,  and that the information  contained in the Report fairly presents,  in
all material respects,  the financial condition and results of operations of the
Registrant.

Date: February 21, 2008

/s/ Donald C. Burke
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Donald C. Burke
Chief Executive Officer (principal executive officer) of
Master Extended Market Index Series of Quantitative Master Series LLC

Pursuant to 18 U.S.C.  Section 1350, the undersigned  officer of Master Extended
Market Index Series of Quantitative Master Series LLC (the "Registrant"), hereby
certifies,  to the best of his knowledge,  that the Registrant's  Report on Form
N-CSR for the period ended December 31, 2007, (the "Report") fully complies with
the  requirements  of Section 15(d) of the  Securities  Exchange Act of 1934, as
amended,  and that the information  contained in the Report fairly presents,  in
all material respects,  the financial condition and results of operations of the
Registrant.

Date: February 21, 2008

/s/ Neal J. Andrews
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Neal J. Andrews
Chief Financial Officer (principal financial officer) of
Master Extended Market Index Series of Quantitative Master Series LLC

This  certification  is being  furnished  pursuant  to Rule  30a-2(b)  under the
Investment  Company Act of 1940, as amended,  and 18 U.S.C.  Section 1350 and is
not being  filed as part of the Form  N-CSR  with the  Securities  and  Exchange
Commission.