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Arphra AIPlain-English read on CoStar Group, Inc.’s valuationInsider signal · 90d
Net buyers
Bought
$2.5M
Sold
$0
Txns
2
Over the trailing 90 days insiders are net buyers — $2.5M bought against $0 sold across 2 open-market Form-4 transactions. Much insider selling is scheduled (10b5-1); read the asymmetry, not any single print.
Open-market Form 4
· insider_tradesInsider transactions · last 365d
Net −$1.1M6 buys
| Insider | Role | Type | Shares | Value | Date |
|---|---|---|---|---|---|
| FLORANCE ANDREW C | director, officer: President and CEO | Buy | +3,100 | $111.0K | May 01, 2026 |
| FLORANCE ANDREW C | director, officer: President and CEO | Buy | +68,330 | $2.4M | May 01, 2026 |
| Sams Louise S | director | Buy | +1,000 | $48.4K | Mar 06, 2026 |
| Glaser Rachel C | director | Buy | +1,000 | $44.9K | Mar 02, 2026 |
| SAINT FREDERICK G. | officer: President, Marketplaces | Buy | +20,000 | $906.6K | Mar 02, 2026 |
| FLORANCE ANDREW C | director, officer: President and CEO | Buy | +55,720 | $2.5M | Feb 27, 2026 |
| Hill John W | director | Sell | −2,250 | $154.5K | Nov 13, 2025 |
| Cann Cynthia Cammett | officer: Chief Accounting Officer | Sell | −1,841 | $126.6K | Nov 13, 2025 |
| SAINT FREDERICK G. | officer: President, Marketplaces | Sell | −25,000 | $2.3M | Aug 28, 2025 |
| SAINT FREDERICK G. | officer: President, Marketplaces | Sell | −25,000 | $2.3M | Jul 28, 2025 |
| Cann Cynthia Cammett | officer: Chief Accounting Officer | Sell | −2,033 | $188.8K | Jul 28, 2025 |
| SAINT FREDERICK G. | officer: President, Marketplaces | Sell | −25,000 | $2.0M | Jun 11, 2025 |
Transaction mix · 365d
54%
Sells6 · $7.1M
Buys6 · $6.0M
Top sellers · 365d
SAINT FREDERICK G. · officer: President, Marketplaces−$6.6M
Cann Cynthia Cammett · officer: Chief Accounting Officer−$315.4K
Hill John W · director−$154.5K
Transactions
12
6 buys · 6 sells
Bought
$5.99M
Open market
Sold
$7.09M
Open market
Net flow
−$1.09M
Buys − sells
Transactions
| Insider | Role | Action | Shares | Price | Value | Trade date | Filing |
|---|---|---|---|---|---|---|---|
| FLORANCE ANDREW C | director, officer: President and CEO | Buy | 3,100 | $35.82 | $111.04K | May 01, 2026 | May 04, 2026 |
| FLORANCE ANDREW C | director, officer: President and CEO | Buy | 68,330 | $35.17 | $2.4M | May 01, 2026 | May 04, 2026 |
| Sams Louise S | director | Buy | 1,000 | $48.36 | $48.36K | Mar 06, 2026 | Mar 09, 2026 |
| Glaser Rachel C | director | Buy | 1,000 | $44.94 | $44.94K | Mar 02, 2026 | Mar 03, 2026 |
| SAINT FREDERICK G. | officer: President, Marketplaces | Buy | 20,000 | $45.33 | $906.6K | Mar 02, 2026 | Mar 03, 2026 |
| FLORANCE ANDREW C | director, officer: President and CEO | Buy | 55,720 | $44.52 | $2.48M | Feb 27, 2026 | Mar 02, 2026 |
| Hill John W | director | Sell | 2,250 | $68.68 | $154.53K | Nov 13, 2025 | Nov 17, 2025 |
| Cann Cynthia Cammett | officer: Chief Accounting Officer | Sell | 1,841 | $68.79 | $126.64K | Nov 13, 2025 | Nov 17, 2025 |
| SAINT FREDERICK G. | officer: President, Marketplaces | Sell | 25,000 | $90.33 | $2.26M | Aug 28, 2025 | Sep 02, 2025 |
| SAINT FREDERICK G. | officer: President, Marketplaces | Sell | 25,000 | $93.23 | $2.33M | Jul 28, 2025 | Jul 29, 2025 |
| Cann Cynthia Cammett | officer: Chief Accounting Officer | Sell | 2,033 | $92.85 | $188.76K | Jul 28, 2025 | Jul 29, 2025 |
| SAINT FREDERICK G. | officer: President, Marketplaces | Sell | 25,000 | $81.10 | $2.03M | Jun 11, 2025 | Jun 12, 2025 |
By insider
- SAINT FREDERICK G.−$5.71Mofficer: President, Marketplaces1B · 3S
- FLORANCE ANDREW C+$4.99Mdirector, officer: President and CEO3B · 0S
- Cann Cynthia Cammett−$315.41Kofficer: Chief Accounting Officer0B · 2S
- Hill John W−$154.53Kdirector0B · 1S
- Sams Louise S+$48.36Kdirector1B · 0S
- Glaser Rachel C+$44.94Kdirector1B · 0S
Beneficial ownership filings
Schedule 13D / 13G — investors holding more than 5% of CSGP-US.
DB · acquisition_ownership4
| Filed | Reporting person | Form | Type | Aggregate owned | % Class | Sole voting | Shared voting | Citizenship | |
|---|---|---|---|---|---|---|---|---|---|
| Oct 11, 2022 | The Vanguard Group - 23-1945930 | — | IA | — | +10.58% | 0 | 549.46K | Pennsylvania | SEC → |
| Feb 14, 2022 | 52-0556948 | — | IA | — | +6.90% | 7.1M | 0 | Maryland | SEC → |
| Feb 09, 2022 | The Vanguard Group - 23-1945930 | — | IA | — | +8.75% | 0 | 370.94K | Pennsylvania | SEC → |
| Feb 01, 2022 | (1) BlackRock, Inc. | — | HC | — | +6.10% | 21.22M | 0 | Delaware | SEC → |
Congressional trading
DB · congress_trades0 buys1 sells1 total
| Chamber | Member | Office | Action | Amount | Trade date | Disclosed |
|---|---|---|---|---|---|---|
| House | Gilbert Cisneros | Gilbert Cisneros | Sale | $1,001 - $15,000 | Apr 14, 2026 | May 11, 2026 |
Top 10 holders · 8 quarters
13F position evolutionNo 13F history in
institutional_holders for CSGP-US.