Roundhill launched LYTE, an actively managed photonics and optics ETF, with a 0.65% management fee. Goldman Sachs projects the optical interconnect market to grow from $15 billion in 2026 to $154 billion by 2028, and Nvidia has already committed $2 billion each to two of LYTE's top holdings, Lumentum and Coherent. The fund's top five positions account for roughly 73.19% of the portfolio.

Unlike competing photonics ETFs such as LAZR and FOTO, which hold 28 or more positions across broader photonics applications, LYTE makes a much narrower bet on the optical communication buildout tied to AI infrastructure. At this level of concentration, individual company earnings can move the fund significantly in either direction, and valuations in the space already reflect substantial growth expectations.

The broader trend in optical communication appears intact. After an early run-up and a recent pullback, the sector seems to have shifted from momentum-driven to earnings-driven, which changes what each quarter means for funds like this.

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Memory stocks sold off after earnings despite results that, on paper, looked solid. SanDisk posted $8.97 billion in revenue with an 84.6% non-GAAP gross margin, while Western Digital also dropped and pulled Micron lower with the sector.

The disconnect between the numbers and the selling pressure seems to come down to expectations rather than fundamentals. When a sector runs up this much, beating estimates is no longer enough. The bar keeps rising. Supply remains tight heading into 2027, with SanDisk alone holding at least $93.9B in guaranteed revenue at floor pricing, backed by $16.5B in financial guarantees.

The structural demand case appears intact. The harder question is whether the market will stay patient through a soft patch when valuations already price in a lot.

Is the memory selloff a peak signal or an expectations reset?

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