CSPI vs LIQT vs CLFD vs POWI vs ADTN

For growth investors, Clearfield, Inc.

(CLFD) is the stronger pick with 19. 6% revenue growth year-over-year, versus 5. 9% for Power Integrations, Inc. (POWI). Power Integrations, Inc. (POWI) offers the better valuation at 187. 9x trailing P/E (58. 7x forward), making it the more compelling value choice. Analysts rate Clearfield, Inc. (CLFD) a "Buy" — based on 8 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, ADTRAN Holdings, Inc.

is actually cheaper at 27. 6x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, CSP Inc.

(CSPI) delivered a total return of +106. 5%, compared to -96. 1% for LiqTech International, Inc. (LIQT). Over 10 years, the gap is even starker: CSPI returned +246. 2% versus LIQT's -91. 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), LiqTech International, Inc.

(LIQT) is the lower-risk stock at 0. 54β versus Power Integrations, Inc. 's 2. 11β — meaning POWI is approximately 292% more volatile than LIQT relative to the S&P 500. On balance sheet safety, Clearfield, Inc. (CLFD) carries a lower debt/equity ratio of 3% versus 117% for LiqTech International, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Clearfield, Inc.

(CLFD) is pulling ahead at 19. 6% versus 5. 9% for Power Integrations, Inc. (POWI). On earnings-per-share growth, the picture is similar: ADTRAN Holdings, Inc. grew EPS 89. 9% year-over-year, compared to -30. 4% for Power Integrations, Inc.. Over a 3-year CAGR, CSPI leads at 2. 6% 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.

Power Integrations, Inc.

(POWI) is the more profitable company, earning 5. 0% net margin versus -51. 7% for LiqTech International, Inc. — meaning it keeps 5. 0% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: POWI leads at 4. 8% versus -50. 3% for LIQT. At the gross margin level — before operating expenses — POWI leads at 54. 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, ADTRAN Holdings, Inc.

(ADTN) trades at 27. 6x forward P/E versus 75. 9x for Clearfield, Inc. — 48. 3x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ADTN: 20. 5% to $18. 00.

In this comparison, CSPI (1.

4% yield), POWI (1. 1% yield) pay a dividend. LIQT, CLFD, ADTN do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, CSP Inc.

(CSPI) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1. 14), 1. 4% yield, +246. 2% 10Y return). ADTRAN Holdings, Inc. (ADTN) carries a higher beta of 1. 88 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (CSPI: +246. 2%, ADTN: -6. 3%), 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 (CSPI (Technology) and LIQT (Industrials) and CLFD (Technology) and POWI (Technology) and ADTN (Technology)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: CSPI is a small-cap quality compounder stock; LIQT is a small-cap quality compounder stock; CLFD is a small-cap high-growth stock; POWI is a small-cap quality compounder stock; ADTN is a small-cap high-growth stock. CSPI, POWI pay a dividend while LIQT, CLFD, ADTN do not, making them suitable for different income and tax situations. 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.