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Ownership Document
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| Schema Version: X0306 |
| Document Type: 4 |
| Period of Report: 2/15/20 |
| Not Subject to Section 16: 0 |
| Issuer: |
| Issuer CIK: 1057352 |
| Issuer Name: COSTAR GROUP, INC. |
| Issuer Trading Symbol: CSGP |
| Reporting Owner: |
| Reporting Owner ID: |
| | Owner CIK: 1717178 |
| | Owner Name: Ruggles Lisa |
| Reporting Owner Address: |
| | Owner Street 1: C/O COSTAR GROUP, INC. |
| | Owner Street 2: 1331 L STREET, NW |
| | Owner City: WASHINGTON |
| | Owner State: DC |
| | Owner ZIP Code: 20005 |
| | Owner State Description: |
| Reporting Owner Relationship: |
| | Is Director? No |
| | Is Officer? Yes |
| | Is Ten Percent Owner? No |
| | Is Other? No |
| | Officer Title: Senior VP, Global Research |
| | Other Text: |
| Non-Derivative Table: |
| Non-Derivative Transaction: |
| | Security Title: |
| | | Value: Common Stock, par value $0.01 per share |
| | Transaction Date: |
| | | Value: 2/15/20 |
| | Transaction Coding: |
| | | Transaction Form Type: 4 |
| | | Transaction Code: F |
| | | Equity Swap Involved? No |
| | Transaction Amounts: |
| | | Transaction Shares: |
| Value: 276 |
| | | Transaction Price Per Share: |
| Value: 731.37 |
| | | Transaction Acquired-Disposed Code: |
| Value: D |
| | Post-Transaction Amounts: |
| | | Shares Owned Following Transaction: |
| Value: 18,296 |
| Footnote ID: F1 |
| | Ownership Nature: |
| | | Direct or Indirect Ownership: |
| Value: D |
| Derivative Table: |
| Footnotes: |
| Footnote - F1: Represents all shares of Common Stock owned, consisting of 2,253 shares of Common Stock and 15,477 shares of Common Stock subject to unvested Restricted Stock grants, 283 shares of Deferred Stock Units and 283 shares of unvested Restricted Stock Units. |
| Remarks: |
| Owner Signature: |
| Signature Name: /s/ Jeannette Koonce, Attorney-in-Fact |
| Signature Date: 2/19/20 |
