LONDON--Advertising firm WPP PLC (WPP.LN) said Monday that it has agreed to invest $25 million for a significant stake in independent ad tech company AppNexus.

WPP, will inject the ad server platform (formerly part of Xaxis, its wholly-owned media and technology platform) and invest $25 million in AppNexus, to enhance AppNexus' position as an independent ad technology provider.

WPP, also announced that its operating company VML, has agreed to acquire Teein, a social media agency in China for an undisclosed sum.

WPP shares at 0808 GMT traded down 0.8% or 10 pence, at GBP12.81, valuing the company at GBP16.88 billion.

-Write to Razak Musah Baba at razak.baba@wsj.com; Twitter: @Raztweet

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