Who makes the Nikon 1 sensors?

They were originally manufactured by Aptina for Nikon, using Nikon additions and changes to Aptina designs. If you're surprised by this answer you shouldn't be: Nikon has had sensor design and evaluation teams going back to at least 1988. Those teams have produced five Nikon-only sensors and have worked with at least four other partners on others. 

Aptina was acquired in 2015 and began to shut down its camera sensor work. The last Nikon 1 model, the J5, uses a Sony EXMOR sensor instead of Aptina.

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