SELX vs ACLS

For growth investors, Axcelis Technologies, Inc.

(ACLS) is the stronger pick with -17. 6% revenue growth year-over-year, versus -67. 9% for Semilux International Ltd. Ordinary Shares (SELX). Axcelis Technologies, Inc. (ACLS) offers the better valuation at 41. 8x trailing P/E (43. 5x forward), making it the more compelling value choice. Analysts rate Axcelis Technologies, Inc. (ACLS) a "Buy" — based on 12 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.

Over the past 5 years, Axcelis Technologies, Inc.

(ACLS) delivered a total return of +286. 8%, compared to -94. 4% for Semilux International Ltd. Ordinary Shares (SELX). Over 10 years, the gap is even starker: ACLS returned +1506% 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 Axcelis Technologies, Inc. 's 2. 00β — meaning ACLS is approximately 576% more volatile than SELX relative to the S&P 500. On balance sheet safety, Axcelis Technologies, Inc. (ACLS) carries a lower debt/equity ratio of 4% versus 52% for Semilux International Ltd. Ordinary Shares — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Axcelis Technologies, Inc.

(ACLS) is pulling ahead at -17. 6% versus -67. 9% for Semilux International Ltd. Ordinary Shares (SELX). On earnings-per-share growth, the picture is similar: Axcelis Technologies, Inc. grew EPS -38. 2% year-over-year, compared to -436. 9% for Semilux International Ltd. Ordinary Shares. Over a 3-year CAGR, ACLS leads at -3. 0% 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.

Axcelis Technologies, Inc.

(ACLS) is the more profitable company, earning 14. 3% net margin versus -152. 3% for Semilux International Ltd. Ordinary Shares — meaning it keeps 14. 3% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ACLS leads at 14. 2% versus -228. 8% for SELX. At the gross margin level — before operating expenses — ACLS leads at 44. 9%, 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.

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)). Axcelis Technologies, Inc. (ACLS) carries a higher beta of 2. 00 — 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%, ACLS: +1506%), 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.

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.