CSPI vs CLFD vs ADTN vs CALX

For growth investors, Calix, Inc.

(CALX) is the stronger pick with 20. 3% revenue growth year-over-year, versus 6. 4% for CSP Inc. (CSPI). Calix, Inc. (CALX) offers the better valuation at 167. 4x trailing P/E (24. 5x 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, Calix, Inc.

is actually cheaper at 24. 5x.

Over the past 5 years, CSP Inc.

(CSPI) delivered a total return of +123. 8%, compared to -22. 5% for ADTRAN Holdings, Inc. (ADTN). Over 10 years, the gap is even starker: CALX returned +513. 0% versus ADTN's -8. 3%. 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), Calix, Inc.

(CALX) is the lower-risk stock at 0. 99β versus ADTRAN Holdings, Inc. 's 1. 91β — meaning ADTN is approximately 92% more volatile than CALX relative to the S&P 500. On balance sheet safety, Calix, Inc. (CALX) carries a lower debt/equity ratio of 3% versus 47% for ADTRAN Holdings, Inc. — giving it more financial flexibility in a downturn.

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

(CALX) is pulling ahead at 20. 3% versus 6. 4% for CSP Inc. (CSPI). On earnings-per-share growth, the picture is similar: Calix, Inc. grew EPS 157. 8% year-over-year, compared to 31. 8% for Clearfield, Inc.. Over a 3-year CAGR, CALX leads at 4. 8% 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.

Calix, Inc.

(CALX) is the more profitable company, earning 1. 8% net margin versus -5. 4% for Clearfield, Inc. — meaning it keeps 1. 8% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: CALX leads at 2. 1% versus -5. 3% for CSPI. At the gross margin level — before operating expenses — CALX leads at 56. 8%, 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, Calix, Inc.

(CALX) trades at 24. 5x forward P/E versus 72. 1x for Clearfield, Inc. — 47. 6x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for CALX: 40. 2% to $61. 00.

In this comparison, CSPI (1.

4% yield) pays a dividend. CLFD, ADTN, CALX 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, +251. 1% 10Y return). ADTRAN Holdings, Inc. (ADTN) carries a higher beta of 1. 91 — 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: +251. 1%, ADTN: -8. 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.

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: CSPI is a small-cap quality compounder stock; CLFD is a small-cap high-growth stock; ADTN is a small-cap high-growth stock; CALX is a small-cap high-growth stock. CSPI pays a dividend while CLFD, ADTN, CALX 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.