Commvault Systems just watched roughly one fifth of its market value evaporate in a single session, with the stock sliding about 19.7% to US$120.01, despite reporting one of its cleanest quarters in years. For a data protection and cyber resilience company that just posted Q1 revenue of US$314.1m and free cash flow of US$51m, the gap between fundamentals and price reaction is striking.

The emotional hit sits squarely on valuation and margins. Investors came in after a strong 90 day run, facing a rich P/E and a recent squeeze in trailing net margin. The earnings headline is margin credibility colliding with an already stretched equity story.

Love Commvault Systems’ clean quarter and solid free cash flow but uneasy about paying up after a…