$EUV vs $LYTE

The short version

EUV is cheaper to own, at 0.35% a year versus 0.65%. LYTE is the bigger fund, with $343M in assets. EUV has been around longer, launching on May 6, 2026.

EUV

The Corgi Lithography & Semiconductor Photonics ETF takes a wider angle on photonics, centered on lithography and chipmaking: the light-based tools that print chips, the equipment makers around them and the foundries that use them. Large positions have included ASML, TSMC, Applied Materials, Lam Research and KLA. Because it leans on large semiconductor equipment and foundry names, EUV behaves more like a chip-equipment fund than a pure optical networking fund. That can make it steadier than the pure plays, but it is a different bet.

LYTE

The Roundhill Photonics & Optics ETF focuses on the optical side of the AI infrastructure build: optical interconnects, lasers and photonic chips that move data with light inside AI data centers. At launch its top holdings included Lumentum, Coherent, Ciena and Fabrinet, plus China-listed optical module makers such as Eoptolink and Zhongji Innolight. A concentrated top ten and a large weight in China-listed optical module makers mean LYTE can move very differently from a broad semiconductor fund. Position sizes can change quickly in an actively managed fund.

Lower fees and more assets are helpful, but they are not the whole story. The bigger question is which strategy matches what you want to own. This comparison is not a recommendation to buy or sell either fund.