Roundhill Investments' DRAM became a blockbuster ETF in record time on the memory trade. It's back with a new fund targeting another AI tech theme: photonics.

Roundhill Investments' DRAM became a blockbuster ETF in record time on the memory trade. It's back with a new fund targeting another AI tech theme: photonics.

Roundhill Investments' DRAM ETF hit nearly $10 billion in 43 days, betting on memory chip shortages as the biggest bottleneck in AI