A photonics-themed ETF saw better demand in its first trading day than a popular memory ETF did at the same point in its life cycle.
Source: [MarketWatch](https://www.marketwatch.com/story/as-lumentum-gears-up-for-earnings-heres-a-sign-the-optical-trade-is-clawing-back-de284355?mod=mw_rss_topstories)