Item 15. Exhibits and Financial Statement Schedules

(a)(1) The following financial statements are filed as a part of this report: CoStar Group, Inc. Consolidated Financial Statements.

(a)(2) Financial statement schedules:

Schedule II – Valuation and Qualifying Accounts

The table below details the activity of the allowance for doubtful accounts and sales credits (1) for the years ended December 31, 2019 and 2018 (in thousands):


	Balance at Beginning of Year		Charged to Expense		Reductions		Balance at End of Year

Year ended December 31, 2018	$	6,469	$	6,542	$	7,302	$	5,709
Year ended December 31, 2019(2)	$	5,709	$	10,978	$	11,590	$	5,097
__________________________

(1)Additions to the allowance for doubtful accounts are charged to bad debt expense. Additions to the allowance for sales credits are charged against revenues.

(2)On January 1, 2020, the Company adopted ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, using the modified retrospective method. The adoption resulted in a $0.5 million reduction to the December 31, 2019 allowance for credit losses. See Note 4 for a description of changes in the allowance for credit losses for the year ended December 31, 2020.

Additional financial statement schedules are omitted because they are not applicable or not required or because the required information is incorporated herein by reference or included in the financial statements or related notes included elsewhere in this report.

(a)(3) The documents required to be filed as exhibits to this Report under Item 601 of Regulation S-K are listed as follows:

Exhibits


Exhibit No.						Description


3.1						Third Amended and Restated Certificate of Incorporation (Incorporated by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K filed with the Commission on June 6, 2013).
3.2						Third Amended and Restated By-Laws (Incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed with the Commission on September 24, 2013).
4.1						Specimen Common Stock Certificate (Incorporated by reference to Exhibit 4.1 to the Registration Statement on Form S-4 of the Registrant (Reg. No. 333-174214) filed with the Commission on June 3, 2011).
4.2						Description of the Registrant's Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 (Incorporated by reference to Exhibit 4.2 to the Registrant’s Annual Report on Form 10-K filed with the Commission on February 26, 2020).
4.3						Indenture, dated as of July 1, 2020, by and among CoStar Group, Inc., as issuer, the guarantors named therein and Wilmington Trust, National Association, as trustee, relating to the 2.800% Senior Notes due 2030, including the form of 2.800% Senior Notes due 2030 (Incorporated by reference to Exhibit 4.1 to the Registrant’s Current Report on Form 8-K filed with the Commission on July 1, 2020).
*10.1						CoStar Group, Inc. 2016 Stock Incentive Plan (Incorporated by reference to Exhibit 4.4 to the Registration Statement on Form S-8 of the Registrant (Reg. No. 333-212278) filed with the Commission on June 28, 2016).
*10.2						First Amendment to the CoStar Group, Inc. 2016 Stock Incentive Plan (Incorporated by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q filed April 25, 2018).
*10.3						CoStar Group, Inc. 2007 Stock Incentive Plan, as amended (Incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed June 8, 2012).
*10.4						CoStar Group, Inc. 2007 Stock Incentive Plan French Sub-Plan (Incorporated by reference to Exhibit 10.3 to the Registrant’s Report on Form 10-K filed February 29, 2008).


Exhibit No.						Description
*10.5						Form of CoStar Group, Inc. 2016 Plan Restricted Stock Grant Agreement between the Registrant and certain of its officers, directors and employees (Incorporated by reference to Exhibit 10.3 to the Registrant’s Quarterly Report on Form 10-Q filed July 28, 2016).
*10.6						Form of CoStar Group, Inc. 2016 Plan Restricted Stock Grant Agreement for Service Awards between the Registrant and certain of its officers and employees (Incorporated by reference to Exhibit 10.4 to the Registrant’s Quarterly Report on Form 10-Q filed July 28, 2016).
*10.7						Form of CoStar Group, Inc. 2016 Plan Restricted Stock Unit Grant Agreement between the Registrant and certain of its officers and employees (Incorporated by reference to Exhibit 10.5 to the Registrant’s Quarterly Report on Form 10-Q filed July 28, 2016).
*10.8						Form of CoStar Group, Inc. 2016 Plan Incentive Stock Option Grant Agreement between the Registrant and certain of its officers and employees (Incorporated by reference to Exhibit 10.6 to the Registrant’s Quarterly Report on Form 10-Q filed July 28, 2016).
*10.9						Form of CoStar Group, Inc. 2016 Plan Incentive Stock Option Grant Agreement between the Registrant and Andrew C. Florance (Incorporated by reference to Exhibit 10.7 to the Registrant’s Quarterly Report on Form 10-Q filed July 28, 2016).
*10.10						Form of CoStar Group, Inc. 2016 Plan Nonqualified Stock Option Grant Agreement between the Registrant and certain of its officers, directors and employees (Incorporated by reference to Exhibit 10.8 to the Registrant’s Quarterly Report on Form 10-Q filed July 28, 2016).
*10.11						Form of CoStar Group, Inc. 2016 Plan Nonqualified Stock Option Grant Agreement between the Registrant and Andrew C. Florance (Incorporated by reference to Exhibit 10.9 to the Registrant’s Quarterly Report on Form 10-Q filed July 28, 2016).
*10.12						Form of 2007 Plan Restricted Stock Grant Agreement between the Registrant and certain of its officers, directors and employees (Incorporated by reference to Exhibit 99.1 to the Registrant’s Report on Form 8-K filed June 22, 2007).
*10.13						Form of 2007 Plan Restricted Stock Unit Agreement between the Registrant and certain of its officers and employees (Incorporated by reference to Exhibit 10.8 to the Registrant's Report on Form 10-K filed February 20, 2014).
*10.14						Form of 2007 Plan Incentive Stock Option Grant Agreement between the Registrant and certain of its officers and employees (Incorporated by reference to Exhibit 10.8 to the Registrant’s Report on Form 10-K filed February 24, 2009).
*10.15						Form of 2007 Plan Incentive Stock Option Grant Agreement between the Registrant and Andrew C. Florance (Incorporated by reference to Exhibit 10.9 to the Registrant’s Report on Form 10-K filed February 24, 2009).
*10.16						Form of 2007 Plan Nonqualified Stock Option Grant Agreement between the Registrant and certain of its officers and employees (Incorporated by reference to Exhibit 10.10 to the Registrant’s Report on Form 10-K filed February 24, 2009).
*10.17						Form of 2007 Plan Nonqualified Stock Option Grant Agreement between the Registrant and certain of its directors (Incorporated by reference to Exhibit 10.11 to the Registrant’s Report on Form 10-K filed February 24, 2009).
*10.18						Form of 2007 Plan Nonqualified Stock Option Grant Agreement between the Registrant and Andrew C. Florance (Incorporated by reference to Exhibit 10.12 to the Registrant’s Report on Form 10-K filed February 24, 2009).
*10.19						Form of 2007 Plan French Sub-Plan Restricted Stock Agreement between the Registrant and certain of its employees (Incorporated by reference to Exhibit 10.10 to the Registrant’s Report on Form 10-K filed February 29, 2008).
*10.20						CoStar Group, Inc. 2016 Cash Incentive Plan (Incorporated by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q filed July 28, 2016).
*10.21						CoStar Group, Inc. Amended and Restated Employee Stock Purchase Plan (Incorporated by reference to Exhibit 4.4 to the Registrant’s Registration Statement on Form S-8 filed with the Commission on September 14, 2015).
*10.22						CoStar Group, Inc. Management Stock Purchase Plan (Incorporated by reference to Exhibit 10.21 to the Registrant’s Report on Form 10-K filed February 23, 2018).
*10.23						Summary of Non-Employee Director Compensation (Incorporated by reference to Exhibit 10.1 to the Registrant's Report on Form 10-Q filed on October 24, 2013).
*10.24						Employment Agreement for Andrew C. Florance (Incorporated by reference to Exhibit 10.2 to Amendment No. 1 to the Registration Statement on Form S-1 of the Registrant (Reg. No. 333-47953) filed with the Commission on April 27, 1998).
*10.25						First Amendment to Andrew C. Florance Employment Agreement, effective January 1, 2009 (Incorporated by reference to Exhibit 10.16 to the Registrant’s Report on Form 10-K filed February 24, 2009).


Exhibit No.						Description
10.26						Form of Indemnification Agreement between the Registrant and each of its officers and directors (Incorporated by reference to Exhibit 10.1 to the Registrant’s Report on Form 10-Q filed on May 7, 2004).
10.27						Deed of Office Lease by and between GLL L-Street 1331, LLC and CoStar Realty Information, Inc., dated February 18, 2011, and made effective as of June 1, 2010 (Incorporated by reference to Exhibit 10.1 to the Registrant’s Report on form 10-Q filed on April 29, 2011).
10.28						Asset Purchase Agreement, dated as of the Petition Date (on or about February 12, 2020), among CSGP Holdings, LLC, CoStar Group, Inc. (solely for the specified purposes), RentPath Holdings, Inc. and the other Sellers named therein (Incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed with the Commission on February 13, 2020).
10.29						Agreement and Plan of Merger, dated as of May 13, 2020, by and among Ten-X Holding Company, Inc., CoStar Realty Information, Inc., Crescendo Sub, Inc., and Thomas H. Lee Equity Fund VII, L.P., solely in its capacity as representative thereunder (Incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed with the Commission on May 14, 2020)
10.30						Second Amended and Restated Credit Agreement, dated as of July 1, 2020, by and among CoStar Group, Inc., as borrower, CoStar Realty Information, Inc., as co-borrower, the lenders party thereto and Bank of America, N.A., as administrative agent (Incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed with the Commission on July 1, 2020)
21.1						Subsidiaries of the Registrant (filed herewith).
23.1						Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm (filed herewith).
31.1						Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).
31.2						Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).
32.1						Certification of Principal Executive Officer pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
32.2						Certification of Principal Financial Officer pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
101.INS						The following financial statements from the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, formatted in Inline XBRL: (i) Consolidated Statements of Operations; (ii) Consolidated Statements of Comprehensive Income; (iii) Consolidated Balance Sheets; (iv) Consolidated Statements of Cash Flows; and (v) Notes to Consolidated Financial Statements, tagged as blocks of text and including detailed tags.
101.SCH						XBRL Taxonomy Extension Schema Document.
101.CAL						XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF						XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB						XBRL Taxonomy Extension Label Linkbase Document.
101.PRE						XBRL Taxonomy Extension Presentation Linkbase Document.
104						The cover page from the Registrant's Annual Report on Form 10-K for the year ended December 31, 2020, formatted in Inline XBRL (included as Exhibit 101).

Management Contract or Compensatory Plan or Arrangement.

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