A bit of Rockley's history has been discussed on this forum. Their latest venture into medtech wareables does not appear to be going well. Many of us have commented on the limitations associated with Rockley's approach using silicon photonics. Indeed i have compared their offering as being akin to the early cell phones.

That stock is now down by almost 90% from its highs last August. $16.99 to a low of $1.83 today.

They are continuing their research: Rockley Photonics Announces Strategic Partnership with Leading Contract Research Organization