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| (1) | | Registration Statement Number 333-82599 on Form S-8 pertaining to the CoStar Group, Inc. 1998 Stock Incentive Plan,
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| (2) | | Registration Statement Number 333-45770 on Form S-8 pertaining to the CoStar Group, Inc. Stock Incentive Plan, as amended,
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| (3) | | Registration Statement Number 333-92165 on Form S-8 pertaining to the CoStar Group, Inc. Stock Incentive Plan, as amended,
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| (4) | | Registration Statement Number 333-69548 on Form S-8 pertaining to the CoStar Group, Inc. Stock Incentive Plan, as amended,
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| (5) | | Registration Statement Number 333-135709 on Form S-8 pertaining to the CoStar Group, Inc. Employee Stock Purchase Plan,
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| (6) | | Registration Statement Number 333-206929 on Form S-8 pertaining to the CoStar Group, Inc. Amended and Restated Employee Stock Purchase Plan,
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| (7) | | Registration Statement Number 333-143968 on Form S-8 pertaining to the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended,
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| (8) | | Registration Statement Number 333-167424 on Form S-8 pertaining to the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended,
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| (9) | | Registration Statement Number 333-182377 on Form S-8 pertaining to the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended,
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| (10) | | Registration Statement Number 333-212278 on Form S-8 pertaining to the CoStar Group, Inc. 2016 Stock Incentive Plan,
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| (11) | | Registration Statement Number 333-223230 on Form S-8 pertaining to the CoStar Group, Inc. Management Stock Purchase Plan,
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| (12) | | Registration Statement Number 333-258220 on Form S-8 of CoStar Group, Inc. pertaining to the Second Amended and Restated Employee Stock Purchase Plan, and |
| (13) | | Registration Statement Number 333-279571 on Form S-4 of CoStar Group, Inc., as well as the related Amendment, |