SOTK vs UCTT vs MKSI vs ACMR vs ENTG

For growth investors, ACM Research, Inc.

(ACMR) is the stronger pick with 15. 2% revenue growth year-over-year, versus -2. 1% for Ultra Clean Holdings, Inc. (UCTT). ACM Research, Inc. (ACMR) offers the better valuation at 43. 2x trailing P/E (30. 8x forward), making it the more compelling value choice. Analysts rate Ultra Clean Holdings, Inc. (UCTT) 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 trailing P/E, ACM Research, Inc.

(ACMR) is the cheapest at 43. 2x versus Entegris, Inc. at 95. 3x. On forward P/E, MKS Inc. is actually cheaper at 27. 3x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, ACM Research, Inc.

(ACMR) delivered a total return of +133. 4%, compared to +18. 8% for Sono-Tek Corporation (SOTK). Over 10 years, the gap is even starker: ACMR returned +31. 0% versus SOTK's +382. 0%. 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), Sono-Tek Corporation (SOTK) is the lower-risk stock at 0.

48β versus Ultra Clean Holdings, Inc. 's 3. 21β — meaning UCTT is approximately 564% more volatile than SOTK relative to the S&P 500. On balance sheet safety, ACM Research, Inc. (ACMR) carries a lower debt/equity ratio of 16% versus 173% for MKS Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), ACM Research, Inc.

(ACMR) is pulling ahead at 15. 2% versus -2. 1% for Ultra Clean Holdings, Inc. (UCTT). On earnings-per-share growth, the picture is similar: MKS Inc. grew EPS 55. 5% year-over-year, compared to -869. 2% for Ultra Clean Holdings, Inc.. Over a 3-year CAGR, ACMR leads at 32. 3% 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.

ACM Research, Inc.

(ACMR) is the more profitable company, earning 10. 4% net margin versus -8. 8% for Ultra Clean Holdings, Inc. — meaning it keeps 10. 4% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ENTG leads at 28. 9% versus 2. 1% for UCTT. At the gross margin level — before operating expenses — SOTK leads at 47. 5%, 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, MKS Inc.

(MKSI) trades at 27. 3x forward P/E versus 41. 0x for Entegris, Inc. — 13. 8x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ACMR: 26. 7% to $75. 00.

In this comparison, MKSI (0.

3% yield), ENTG (0. 3% yield), ACMR (0. 2% yield) pay a dividend. SOTK, UCTT do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Sono-Tek Corporation (SOTK) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0.

48), +382. 0% 10Y return). ACM Research, Inc. (ACMR) carries a higher beta of 3. 17 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (SOTK: +382. 0%, ACMR: +31. 0%), 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: SOTK is a small-cap quality compounder stock; UCTT is a small-cap quality compounder stock; MKSI is a mid-cap quality compounder stock; ACMR is a small-cap high-growth stock; ENTG is a mid-cap quality compounder 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.