AYI vs SPIR

For growth investors, Acuity Brands, Inc.

(AYI) is the stronger pick with 13. 1% revenue growth year-over-year, versus -35. 2% for Spire Global, Inc. (SPIR). Spire Global, Inc. (SPIR) offers the better valuation at 11. 4x trailing P/E, making it the more compelling value choice. Analysts rate Spire Global, Inc. (SPIR) 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, Spire Global, Inc.

(SPIR) is the cheapest at 11. 4x versus Acuity Brands, Inc. at 23. 6x.

Over the past 5 years, Acuity Brands, Inc.

(AYI) delivered a total return of +56. 8%, compared to -76. 9% for Spire Global, Inc. (SPIR). Over 10 years, the gap is even starker: AYI returned +22. 7% versus SPIR's -75. 9%. 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), Acuity Brands, Inc.

(AYI) is the lower-risk stock at 1. 40β versus Spire Global, Inc. 's 2. 93β — meaning SPIR is approximately 109% more volatile than AYI relative to the S&P 500. On balance sheet safety, Spire Global, Inc. (SPIR) carries a lower debt/equity ratio of 8% versus 37% for Acuity Brands, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Acuity Brands, Inc.

(AYI) is pulling ahead at 13. 1% versus -35. 2% for Spire Global, Inc. (SPIR). On earnings-per-share growth, the picture is similar: Spire Global, Inc. grew EPS 137. 8% year-over-year, compared to -6. 8% for Acuity Brands, Inc.. Over a 3-year CAGR, AYI leads at 2. 7% 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.

Spire Global, Inc.

(SPIR) is the more profitable company, earning 71. 7% net margin versus 9. 1% for Acuity Brands, Inc. — meaning it keeps 71. 7% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: AYI leads at 13. 7% versus -121. 4% for SPIR. At the gross margin level — before operating expenses — AYI leads at 47. 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.

Analyst consensus price targets imply the most upside for AYI: 32.

7% to $392. 50.

In this comparison, AYI (0.

2% yield) pays a dividend. SPIR does not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Acuity Brands, Inc.

(AYI) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding. Spire Global, Inc. (SPIR) carries a higher beta of 2. 93 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (AYI: +22. 7%, SPIR: -75. 9%), 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 Industrials sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: AYI is a small-cap quality compounder stock; SPIR is a large-cap deep-value 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.