Af­ter de­cou­pling from Re­gen­eron, Sanofi says it’s time to sell the $13B stake picked up in the mar­riage

With Re­gen­eron shares go­ing for a peak price — af­ter dou­bling from last fall — Sanofi is putting a $13 bil­lion stake in their long­time part­ner on the auc­tion block. And Re­gen­eron is tak­ing $5 bil­lion of that ac­tion for them­selves.

Sanofi — which has been de­cou­pling from Re­gen­eron for more than a year now — bought in big in ear­ly 2013, back when Re­gen­eron’s stock was go­ing for around $165 a share. Small in­vestors flocked to the deal, buzzing about an im­mi­nent takeover. The buy­out chat­ter wound down long ago.

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