<div id="readability-page-1"><div>Shares of Lumentumand Coherent plunged Monday after ex-OpenAI researcher-turned-investor Leopold Aschenbrenner disclosed his Situational Awareness fund exited his 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.</div></div>

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Shares of Lumentum and Coherent fell sharply after investor Leopold Aschenbrenner revealed his fund sold its holdings in these companies. Lumentum dropped 11% and Coherent over 6%, despite previous gains of 120% and 80% respectively this year. Aschenbrenner's actions also boosted T1 Energy shares and included a bearish bet against Nvidia, which recently invested $4 billion in Lumentum and Coherent.

- Lumentum and Coherent shares fell significantly after investor Leopold Aschenbrenner announced the exit of his Situational Awareness fund from these companies in the first quarter.  
- Lumentum's stock dropped 11%, while Coherent decreased by over 6%, although both companies had previously experienced substantial gains of over 120% and 80% since January.  
- Aschenbrenner's fund also impacted T1 Energy positively and included a bearish bet against Nvidia, which invested $4 billion in Lumentum and Coherent.

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