June 1, 2013 Aventis Asset Management, LLC

Exhibit 10.6(b)

Wealth Management

Ceres Managed Futures LLC

000 Xxxxx Xxxxxx - 00xx Xx

Xxx Xxxx, XX 00000

tel 000 000 0000

fax 000 000 0000

June 1, 2013

Aventis Asset Management, LLC

0000 X. Xxxx Xxxx Xxxx, Xxxxx 000

Buffalo Grove, IL 60089

Attention: Xx. Xxxxx Xxxxx

Re: Management Agreement Renewals

Dear Xx. Xxxxx:

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 Xx. Xxxxxx Xxxxxx at the address above or fax to 000-000-0000. If you have any questions I can reached at 000-000-0000.

Very truly yours,

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

Print Name: Xxxxxx Xxxxx, coo/Head of Marketing

DG/sr

Xxxxxx Xxxxxxx Xxxxx Xxxxxx LLC, Member SIPC.