With 18.7% revenue growth but a PEG ratio near 8.0, CoStar violates Lynch's cardinal rule of paying fair prices for growth.

This framework sees a fast grower burning cash at record rates while trading at 149x earnings — a lottery ticket, not an investment.

What kind of company is this, and what should we expect from it?

This framework classifies CoStar as a fast grower showing acceleration, which Lynch typically loves. However, the growth comes with deteriorating profitability and appears highly dependent on inflation pass-through rather than organic expansion. A fast grower destroying margins is not the 10-to-40-bagger opportunity Lynch seeks.

Can you explain in one sentence why this company grows?

The growth story is clear: CoStar owns essential data for commercial real estate professionals who can't operate without it, evidenced by 94% renewal rates. The expansion into residential with Apartments.com and Homes.com broadens the addressable market. This framework appreciates the simplicity — 'they have data real estate professionals must have.'

Are we paying a fair price for the growth we're getting?

This framework sees a PEG ratio around 8.0 — far above Lynch's preferred 1.0 or below. Even using the most generous growth assumptions, the valuation suggests paying extreme premiums for growth that the market itself expects to decelerate. Lynch would say this violates his fundamental principle of fair price for growth.

Can this company survive trouble?

This framework sees a fortress balance sheet with more cash than debt, providing significant flexibility. However, the cash burn rate of $150.6M quarterly raises concerns about sustainability if the capex intensity continues. The company can clearly survive trouble, but is actively choosing to consume cash at record rates.

Applying this framework reveals a fast grower that violates Lynch's core principles — the PEG ratio of 8.0 says we're paying lottery ticket prices for a business burning cash while margins collapse. The clear growth story and fortress balance sheet can't overcome paying 149x earnings when Lynch teaches that 'the P/E of any fairly priced company equals its growth rate.' The framework suggests looking elsewhere for the next 10-bagger. At what price does even the best growth story become a speculation rather than an investment?

This analysis applies Peter Lynch's published investment framework to publicly available financial data. It is not authored by, endorsed by, or affiliated with Peter Lynch. Educational purposes only. Not financial advice.