ACLS vs UCTT

For growth investors, Ultra Clean Holdings, Inc.

(UCTT) is the stronger pick with -2. 1% revenue growth year-over-year, versus -17. 6% for Axcelis Technologies, Inc. (ACLS). Axcelis Technologies, Inc. (ACLS) offers the better valuation at 45. 0x trailing P/E (46. 9x 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.

On forward P/E, Ultra Clean Holdings, Inc.

is actually cheaper at 36. 0x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, Axcelis Technologies, Inc.

(ACLS) delivered a total return of +324. 6%, compared to +73. 6% for Ultra Clean Holdings, Inc. (UCTT). Over 10 years, the gap is even starker: ACLS returned +1610% versus UCTT's +1451%. 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), Axcelis Technologies, Inc.

(ACLS) is the lower-risk stock at 2. 00β versus Ultra Clean Holdings, Inc. 's 3. 19β — meaning UCTT is approximately 60% more volatile than ACLS relative to the S&P 500. On balance sheet safety, Axcelis Technologies, Inc. (ACLS) carries a lower debt/equity ratio of 4% versus 103% for Ultra Clean Holdings, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Ultra Clean Holdings, Inc.

(UCTT) is pulling ahead at -2. 1% versus -17. 6% for Axcelis Technologies, Inc. (ACLS). On earnings-per-share growth, the picture is similar: Axcelis Technologies, Inc. grew EPS -38. 2% year-over-year, compared to -869. 2% for Ultra Clean Holdings, Inc.. 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 -8. 8% for Ultra Clean Holdings, Inc. — 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 2. 1% for UCTT. 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.

On forward earnings alone, Ultra Clean Holdings, Inc.

(UCTT) trades at 36. 0x forward P/E versus 46. 9x for Axcelis Technologies, Inc. — 10. 9x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for UCTT: 1. 8% to $85. 00.

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, Axcelis Technologies, Inc.

(ACLS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+1610% 10Y return). Ultra Clean Holdings, Inc. (UCTT) carries a higher beta of 3. 19 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (ACLS: +1610%, UCTT: +1451%), 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.