Does spending more on R&D actually pay off?

This case study digs into 15 years of SEC filings from 15 tech companies — Microsoft, Meta, Snowflake, NVIDIA, HP, and others — to test a question every tech leader eventually asks: does R&D investment intensity predict better financial outcomes, and if so, how soon?

The naive answer looked like bad news: pooling all companies together, higher R&D-to-revenue ratios were associated with WORSE future margins (r = -0.41).

But that's a classic trap. Mature giants like Microsoft naturally show low R&D-to-revenue ratios (their revenue base is huge). Young companies like Snowflake show high ratios and often run at a loss — not because R&D hurts them, but because they're still in growth mode.

Once I controlled for that (comparing each company only to its OWN historical average), the relationship nearly vanished: r = -0.08. Statistically indistinguishable from zero.

The real insight isn't "R&D doesn't matter." It's that R&D investment likely shows up in revenue growth and competitive position — not near-term margin — and probably takes longer than 2 years to show up in the numbers at all.

For anyone making the business case for AI/tech investment: R&D-to-revenue ratio alone is a weak signal for near-term profitability. Don't let it be the only argument in the room.