June 1, 2013 Aventis Asset Management, LLC

Exhibit 10.6(b)

Wealth Management

Ceres Managed Futures LLC

▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ - ▇▇▇▇ ▇▇

▇▇▇ ▇▇▇▇, ▇▇ ▇▇▇▇▇

tel ▇▇▇ ▇▇▇ ▇▇▇▇

fax ▇▇▇ ▇▇▇ ▇▇▇▇

June 1, 2013

Aventis Asset Management, LLC

▇▇▇▇ ▇. ▇▇▇▇ ▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇ ▇▇▇

Buffalo Grove, IL 60089

Attention: ▇▇. ▇▇▇▇▇ ▇▇▇▇▇

Re: Management Agreement Renewals

Dear ▇▇. ▇▇▇▇▇:

We are writing with respect to your management agreements concerning the commodity pools to which reference is made below (the “Management Agreements”). We are extending the term of the Management Agreements through June 30, 2014 and all other provisions of the Management Agreements will remain unchanged.

• Commodity Advisors Fund L.P.

• MB Master Fund L.P.

• Institutional Futures Portfolio L.P.

• MSSB Spectrum Strategic L.P.

• Managed Futures Premier Aventis II, L.P.

• Managed Futures Premier Aventis L.P.

Please acknowledge receipt of this modification by signing one copy of this letter and returning it to the attention of ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ at the address above or fax to ▇▇▇-▇▇▇-▇▇▇▇. If you have any questions I can reached at ▇▇▇-▇▇▇-▇▇▇▇.

Very truly yours,

CERES MANAGED FUTURES LLC
By:		/s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇
		▇▇▇▇▇▇ ▇▇▇▇▇▇
		Chief Financial Officer & Director
AVENTIS ASSET MANAGEMENT, LLC
By:		/s/ ▇▇▇▇▇▇ ▇▇▇▇▇

Print Name: ▇▇▇▇▇▇ ▇▇▇▇▇, coo/Head of Marketing

DG/sr

▇▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ LLC, Member SIPC.