The Boston Company Asset Management, LLC, Fayez Sarofim & Co., William Blair & Company, L.L.C. and Wellington Management Company, LLP have been approved as sub-advisors for the Northwestern Mutual Series Fund, Inc. They will begin to provide sub-advisory services to the Fund's Growth Stock, Large Cap Core Stock, Mid Cap Growth Stock and Small Cap Growth Stock Portfolios on or about July 1, 2013. [SEC Filing]. 

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