#Roundhill光模块ETF首日成交7200万 LYTE: China-U.S. Photonics and Optical Communications ETF
Recently, the Roundhill Photonics & Optics ETF (ticker: LYTE), launched by active ETF issuer Roundhill Investments, began trading. The fund targets the global optical communications and optoelectronics industries, tapping into the theme of growing demand for optical connectivity driven by AI data center infrastructure construction.
The two U.S. optical communications component makers Lumentum and Coherent have a combined weighting of over 30%, making them the fund’s two largest individual positions; meanwhile, Chinese optical communications module supply-chain companies including EVERLIGHT, Zhongji Innolight, TFC Communication, Yuanjie Technology, and Accelink Technologies collectively account for as much as 46.8%.
Key points:
Pure thematic exposure: Constituents must derive at least 50% of their revenue from optical communications/photonics businesses, covering optical modules, lasers, silicon photonic chips, optical interconnect systems, optical components, and other segments. The top five holdings account for over 73% combined, while the top 10 make up approximately 97%, significantly amplifying volatility.
China-U.S. dual supply chains: Lumentum and Coherent (30%+ combined) represent leading U.S. laser and optical component companies—NVIDIA invested $2 billion in each in March; Chinese companies including Eoptolink, Zhongji Innolight, TFC Communication, Yuanjie Technology, and Accelink Technologies collectively account for approximately 46.8%.
TRS structure: Chinese holdings are implemented through total return swaps, in order to meet the tax diversification test for a RIC (regulated investment company), also making it one of the ETFs in the U.S. stock market with the largest exposure to leading A-share optical module companies.
Sector potential: Goldman Sachs forecasts the optical communications market to grow from approximately $15 billion in 2026 → $15 billion in 2028 → $154 billion in 2028 (9x+ growth); NVIDIA has invested a cumulative $6.5 billion+ in photonics companies since March, and its Feynman architecture (to be deployed in 2028) will shift core interconnects from copper to optical, with Jensen Huang calling photonics key to “gigawatt-scale AI computing factories.”
Risks and peer comparison
⚠️ Scale risk: With only $1 million in AUM and 40k shares outstanding, liquidity is extremely poor and bid-ask spreads are wide; large inflows or outflows could move the price—this is currently the point requiring the most caution.
Peer comparison: Tema’s LAZR (listed on 6/30, with private-market exposure to Anthropic) currently has only approximately $18M in assets; by contrast, Roundhill’s own DRAM storage ETF surged to nearly $25 billion after launching in April, the fastest growth in history.
Going forward, watch whether LYTE’s assets grow rapidly, as rapid asset growth would increase the need to allocate to its component stocks.
Concentration risk: With the top five holdings accounting for over 73%, disappointing results from any single constituent could sharply amplify net asset value volatility.
Thematic risk: The fund depends on continued AI computing infrastructure construction; if capex slows or new technology paths such as CPO gain adoption, the revenues and profits of its holdings could be materially affected.
In one sentence: LYTE is an extremely concentrated optical communications thematic fund with very small assets currently; watch whether its assets expand in the future and the impact of increased positions in these stocks. Attention should be paid to foreign investors’ ownership percentages in such Hong Kong companies and changes in their A-share/H-share premiums.