$EUV vs $PHOX

The short version

EUV is cheaper to own, at 0.35% a year versus 0.60%. 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.

PHOX

The Aura AI Photonics ETF tracks the VettaFi AI Photonics Index, a basket of roughly 25 global companies involved in generating, transmitting and processing data with light for AI computing: lasers, transceivers, photonic integrated circuits and specialty materials such as indium phosphide. As an index fund, PHOX follows set rules rather than a manager's calls, which makes it easier to know what you own. It is still a small, non-diversified, single-theme fund, so expect big swings.

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.