When the Founder Buys the Dip Three Times, You Pay Attention

30‑Second Take

Why now? Andy Florance founded CoStar 35 years ago and still runs it. Last week he stepped into the open market and picked up 83,300 shares at $29.89 apiece.

That's a $2.49 million buy. His third one in the last year.

Founders don't write cheques that size for the optics. They write them when they think the price is wrong.

CoStar is the dominant data platform behind commercial real estate (CoStar Suite, LoopNet) and, more recently, residential (Apartments.com, Homes.com). The stock has been in the penalty box while management pours money into the Homes.com buildout. That spending cycle is exactly what's created your entry point.

A data monopoly. A founder-led balance sheet. A beaten-up price. That's the pitch.

Trade Setup

Time frame: Medium-term (3 to 9 months)

Edge type: Insider-signal contrarian setup

You're buying alongside the founder, near multi-year lows, on a business that spits out recurring subscription revenue.

The catalyst isn't a single earnings print. It's the point where Homes.com losses start to narrow and the market re-underwrites CoStar as a growth compounder again. Insider buying at these levels tends to front-run that re-rate by two to three quarters, so if you're waiting for confirmation, you're already two to three quarters late.

Your risk: a bad Q3 spend print. Your reward: multiple expansion back toward historical norms.

Snapshot Table

Chart

1-Month Synopsis: CSGP has been grinding sideways to lower over the past month, holding a tight range near its 52-week low around $30. No relief rally. No bounce off the bottom. Just quiet accumulation.

That's actually what you want to see when an insider steps in. If the CEO buys and the stock jumps 15%, you missed the entry. Here, Florance bought at $29.89 and the price is still $30.21. You're effectively getting his fill.

Bull Case 

Core thesis: CoStar spent 35 years building the most comprehensive commercial real estate database in the country. Every broker, appraiser, lender, and institutional investor pays a subscription to access it.

Try replicating that. You can't. It's the Bloomberg of CRE, and the switching costs are enormous.

Catalysts: Management has been spending aggressively on marketing to build Homes.com into a Zillow competitor. The Street hates the near-term hit to margins.

But if Florance is right, this is the same playbook that turned Apartments.com from an acquisition into a category-killer that now prints massive recurring revenue. He's done this before.

And the insider buying is the tell. Three open-market purchases from the founder-CEO in a single year isn't a signal you ignore. Florance already owns a meaningful stake. He doesn't need more shares for compensation. He's buying because he thinks the stock is materially mispriced.

Valuation upside: Any commentary from management showing Homes.com losses are peaking, or a slowdown in marketing spend that flows straight to margins. That's your unlock.

Bear Case 

Homes.com could be a money pit. Zillow is entrenched. Redfin is fighting. If you're betting here, building a residential real estate portal at scale means burning cash on marketing for years, with no guarantee CoStar wins share fast enough to justify the spend.

CoStar's core commercial customers are brokers and lenders. If commercial real estate transaction volumes stay depressed, subscription growth slows and pricing power weakens. A higher-for-longer rate environment isn't helping either.

The chart isn't your friend yet. Stock is near its 52-week low with no confirmed reversal pattern. You could be catching a knife.

And even after the drawdown, CoStar isn't cheap on today's earnings. The whole thesis rests on Homes.com turning the corner. If that takes another year, you're dead money.

What kills the trade: an earnings report where management raises Homes.com spend guidance without commensurate revenue traction. If that happens, get out.

Quick Checklist 

✅ Insider buying confirmed: Florance $2.49M open-market purchase, 3rd in a year
✅ Entry price close to insider's fill ($30.21 vs $29.89)
✅ Trading near 52-week low, limited downside relative to upside
✅ Watch Q3 earnings on October 27 for Homes.com spend commentary

Deep‑Dive Links

• Latest earnings report

• Analyst ratings and price targets

• Short interest data

• Company profile and investor relations

That’s all for today’s Everyday Alpha. We’ll have a new pick for you every morning before the market opens, so stay tuned!

Best Regards,
—Noah Zelvis
Everyday Alpha