SELX vs LITE vs AAOI vs COHR

For growth investors, Applied Optoelectronics, Inc.

(AAOI) is the stronger pick with 82. 8% revenue growth year-over-year, versus -67. 9% for Semilux International Ltd. Ordinary Shares (SELX). Lumentum Holdings Inc. (LITE) offers the better valuation at 2412. 9x trailing P/E (114. 4x forward), making it the more compelling value choice. Analysts rate Lumentum Holdings Inc. (LITE) a "Buy" — based on 24 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On forward P/E, Coherent, Inc.

is actually cheaper at 59. 5x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, Applied Optoelectronics, Inc.

(AAOI) delivered a total return of +1978%, compared to -94. 4% for Semilux International Ltd. Ordinary Shares (SELX). Over 10 years, the gap is even starker: LITE returned +36. 4% versus SELX's -94. 4%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), Semilux International Ltd.

Ordinary Shares (SELX) is the lower-risk stock at 0. 30β versus Applied Optoelectronics, Inc. 's 4. 13β — meaning AAOI is approximately 1296% more volatile than SELX relative to the S&P 500. On balance sheet safety, Applied Optoelectronics, Inc. (AAOI) carries a lower debt/equity ratio of 23% versus 2% for Lumentum Holdings Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Applied Optoelectronics, Inc.

(AAOI) is pulling ahead at 82. 8% versus -67. 9% for Semilux International Ltd. Ordinary Shares (SELX). On earnings-per-share growth, the picture is similar: Lumentum Holdings Inc. grew EPS 104. 6% year-over-year, compared to -436. 9% for Semilux International Ltd. Ordinary Shares. Over a 3-year CAGR, AAOI leads at 26. 9% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

Lumentum Holdings Inc.

(LITE) is the more profitable company, earning 1. 6% net margin versus -152. 3% for Semilux International Ltd. Ordinary Shares — meaning it keeps 1. 6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: COHR leads at 9. 4% versus -228. 8% for SELX. At the gross margin level — before operating expenses — COHR leads at 35. 4%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

On forward earnings alone, Coherent, Inc.

(COHR) trades at 59. 5x forward P/E versus 167. 2x for Applied Optoelectronics, Inc. — 107. 7x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for COHR: -20. 9% to $252. 50.

None of the stocks in this comparison currently pay a material dividend.

All are effectively zero-yield and should be held for capital appreciation rather than income.

For long-horizon retirement investors, Semilux International Ltd.

Ordinary Shares (SELX) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 30)). Lumentum Holdings Inc. (LITE) carries a higher beta of 2. 69 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (SELX: -94. 4%, LITE: +36. 4%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

Both stocks operate in the Technology sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: SELX is a small-cap quality compounder stock; LITE is a mid-cap high-growth stock; AAOI is a mid-cap high-growth stock; COHR is a mid-cap high-growth stock. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.