TRANSAMERICA SERIES TRUST AMENDMENT TO SUB-ADVISORY BETWEEN TRANSAMERICA ASSET MANAGEMENT, INC. AND MADISON ASSET MANAGEMENT, LLC

Exhibit (d)(15)(b)

TRANSAMERICA SERIES TRUST

AMENDMENT TO SUB-ADVISORY BETWEEN

TRANSAMERICA ASSET MANAGEMENT, INC. AND

MADISON ASSET MANAGEMENT, LLC

THIS AMENDMENT is made as of November 1, 2019 to the Sub-Advisory Agreement dated May 1, 2011 (the “Agreement”), between Transamerica Asset Management, Inc. and Madison Asset Management, LLC (the “Sub-Adviser”).

In consideration of the mutual covenants contained herein, the parties agree as follows:

1. Schedule A. Schedule A to the Agreement is hereby deleted in its entirety and replaced as follows:

FUND		SUB-ADVISER FEE*		Effective Date
Transamerica Madison Diversified Income VP		0.25% of the first $500 million; 0.22% over $500 million up to $1 billion; and 0.20% over $1 billion		08/01/2017

* As a percentage of average daily net assets on an annual basis.

In all other respects, the Agreement dated May 1, 2011 is confirmed and remains in full force and effect.

The parties hereto have caused this amendment to be executed as of November 1, 2019.

TRANSAMERICA ASSET MANAGEMENT, INC.
By:		/s/ Xxxxxxxxxxx X. Xxxxxxx
Name:		Xxxxxxxxxxx X. Xxxxxxx
Title:		Senior Vice President
MADISON ASSET MANAGEMENT, LLC
By:		/s/ Xxxxxx X. Xxxxxxxxx
Name:		Xxxxxx X. Xxxxxxxxx
Title:		Chief Legal Officer & Chief Compliance Officer