RMNI vs SPWR vs FSLR vs RUN

For growth investors, Sunrun Inc.

(RUN) is the stronger pick with 45. 1% revenue growth year-over-year, versus -1. 7% for Rimini Street, Inc. (RMNI). Sunrun Inc. (RUN) offers the better valuation at 8. 5x trailing P/E (15. 3x forward), making it the more compelling value choice. Analysts rate First Solar, Inc. (FSLR) a "Buy" — based on 73 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, Sunrun Inc.

(RUN) is the cheapest at 8. 5x versus First Solar, Inc. at 15. 5x. On forward P/E, SunPower Inc. is actually cheaper at 5. 5x — notably different from the trailing picture, reflecting expected earnings growth. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: First Solar, Inc. wins at 0. 40x versus Rimini Street, Inc. 's 0. 58x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, First Solar, Inc.

(FSLR) delivered a total return of +204. 7%, compared to -80. 0% for SunPower Inc. (SPWR). Over 10 years, the gap is even starker: FSLR returned +334. 7% versus SPWR's -80. 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), First Solar, Inc.

(FSLR) is the lower-risk stock at 1. 36β versus Sunrun Inc. 's 2. 81β — meaning RUN is approximately 106% more volatile than FSLR relative to the S&P 500. On balance sheet safety, First Solar, Inc. (FSLR) carries a lower debt/equity ratio of 5% versus 3% for Sunrun Inc. — giving it more financial flexibility in a downturn.

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

(RUN) is pulling ahead at 45. 1% versus -1. 7% for Rimini Street, Inc. (RMNI). On earnings-per-share growth, the picture is similar: Rimini Street, Inc. grew EPS 197. 5% year-over-year, compared to 0. 0% for SunPower Inc.. Over a 3-year CAGR, SPWR leads at 65. 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.

First Solar, Inc.

(FSLR) is the more profitable company, earning 29. 3% net margin versus -10. 5% for SunPower Inc. — meaning it keeps 29. 3% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: FSLR leads at 32. 3% versus -4. 3% for RUN. At the gross margin level — before operating expenses — RMNI leads at 60. 4%, 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, First Solar, Inc. (FSLR) is the more undervalued stock at a PEG of 0. 40x versus Rimini Street, Inc. 's 0. 58x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, SunPower Inc. (SPWR) trades at 5. 5x forward P/E versus 15. 3x for Sunrun Inc. — 9. 8x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for SPWR: 1350. 5% to $15. 81.

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, First Solar, Inc.

(FSLR) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+334. 7% 10Y return). SunPower Inc. (SPWR) carries a higher beta of 2. 15 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (FSLR: +334. 7%, SPWR: -80. 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 (RMNI (Technology) and SPWR (Energy) and FSLR (Energy) and RUN (Energy)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: RMNI is a small-cap deep-value stock; SPWR is a small-cap quality compounder stock; FSLR is a mid-cap high-growth stock; RUN 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.