OSS vs AEIS vs VICR vs ACMR

For growth investors, Advanced Energy Industries, Inc.

(AEIS) is the stronger pick with 21. 4% revenue growth year-over-year, versus -41. 1% for One Stop Systems, Inc. (OSS). ACM Research, Inc. (ACMR) offers the better valuation at 43. 2x trailing P/E (29. 7x forward), making it the more compelling value choice. Analysts rate One Stop Systems, Inc. (OSS) a "Buy" — based on 7 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 Vicor Corporation at 100. 1x. On forward P/E, ACM Research, Inc. is actually cheaper at 29. 7x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: ACM Research, Inc. wins at 0. 84x versus Advanced Energy Industries, Inc. 's 21. 57x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Advanced Energy Industries, Inc.

(AEIS) delivered a total return of +292. 7%, compared to +133. 4% for ACM Research, Inc. (ACMR). Over 10 years, the gap is even starker: ACMR returned +30. 7% versus OSS's +209. 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), Advanced Energy Industries, Inc.

(AEIS) is the lower-risk stock at 2. 18β versus ACM Research, Inc. 's 3. 24β — meaning ACMR is approximately 49% more volatile than AEIS relative to the S&P 500. On balance sheet safety, Vicor Corporation (VICR) carries a lower debt/equity ratio of 2% versus 50% for Advanced Energy Industries, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Advanced Energy Industries, Inc.

(AEIS) is pulling ahead at 21. 4% versus -41. 1% for One Stop Systems, Inc. (OSS). On earnings-per-share growth, the picture is similar: Vicor Corporation grew EPS 1764% year-over-year, compared to -10. 5% for ACM Research, 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.

Vicor Corporation (VICR) is the more profitable company, earning 29.

1% net margin versus 8. 2% for Advanced Energy Industries, Inc. — meaning it keeps 29. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ACMR leads at 12. 1% versus -10. 5% for OSS. At the gross margin level — before operating expenses — VICR leads at 52. 6%, 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.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, ACM Research, Inc. (ACMR) is the more undervalued stock at a PEG of 0. 84x versus Advanced Energy Industries, Inc. 's 21. 57x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, ACM Research, Inc. (ACMR) trades at 29. 7x forward P/E versus 94. 3x for Vicor Corporation — 64. 6x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for VICR: -6. 3% to $245. 00.

In this comparison, ACMR (0.

2% yield), AEIS (0. 1% yield) pay a dividend. OSS, VICR do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Advanced Energy Industries, Inc.

(AEIS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+928. 9% 10Y return). Vicor Corporation (VICR) carries a higher beta of 2. 79 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (AEIS: +928. 9%, VICR: +27. 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.

These companies operate in different sectors (OSS (Technology) and AEIS (Industrials) and VICR (Technology) and ACMR (Technology)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: OSS is a small-cap quality compounder stock; AEIS is a mid-cap high-growth stock; VICR is a mid-cap quality compounder stock; ACMR is a small-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.