Lumentum, Coherent fall after hedge fund manager Aschenbrenner dumps his holdings

Shares of Lumentum and Coherent plunged Monday after Leopold Aschenbrenner, ex-OpenAI researcher turned investor, disclosed his Situational Awareness fund exited its holdings in those companies during the first quarter.

By the afternoon, Lumentum was down 11% and Coherent was down over 6%. The losses are relatively small compared to the over 120% and 80% gains the AI infrastructure companies had put up, respectively, since January.

The two companies are developers of phonetics and optical equipment, which help data centers and AI hyperscalers transmit data.

Aschenbrenner’s firm, Situational Awareness, is making major market ripples today, also sending shares of T1 Energy soaring on news he bought the stock.

He also made a bearish bet against Nvidia, which recently invested $4 billion ($2 billion each) into Lumentum and Coherent.

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