Every Form 4 that CoStar Group Inc (CSGP) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow CSGP and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full CSGP filings page.
COSTAR GROUP, INC. Chief Accounting Officer Cynthia Cammett Cann reported a sale of 4,788 shares of common stock on 2026-08-07 in an open market or private transaction at $30.78 per share. Following this transaction, she holds 18,822 shares of CoStar Group common stock directly.
CoStar Group, Inc. director John W. Hill reported a sale of 3,500 shares of common stock on 2026-08-05 at $30.21 per share in an open market or private transaction. Following this sale, Hill directly holds 22,993 shares of CoStar Group common stock.
CoStar Group, Inc. founder and CEO Andrew C. Florance reported purchasing 83,300 shares of common stock on August 4, 2026 at an average price of $29.89 per share, based on prices ranging from $29.57 to $29.99. After this open-market purchase, he directly holds 1,806,165.03 shares.
Rossmann Robin Jack reported acquisition or exercise transactions in this Form 4 filing.
CoStar Group, Inc. granted Chief Financial Officer Robin Jack Rossmann 34,771 restricted stock units on July 31, 2026. Each unit represents a contingent right to receive one share of common stock. The award vests in three equal installments on August 1, 2027, 2028 and 2029, and Rossmann now directly holds 34,771 RSUs.
CoStar Group, Inc. Chief Accounting Officer Cynthia Cammett received a grant of 26,078 restricted stock units on July 31, 2026, each representing one share of common stock vesting in four equal installments on August 1, 2027, 2028, 2029, and 2030.
On August 1, 2026, 1,077 shares of common stock were withheld at $28.76 per share to satisfy tax obligations, leaving her with 23,610 CoStar common shares held directly, in addition to the new RSU award.
COSTAR GROUP, INC. executive SAINT FREDERICK G., President, Marketplaces, disposed of 1,436 shares of common stock on August 1, 2026. The shares were delivered or withheld to satisfy an exercise price or tax liability at $28.76 per share. After this transaction, he directly holds 278,415 shares of CoStar common stock.
CoStar Group, Inc. Chief Financial Officer Christian M. Lown reported a tax-withholding disposition of company stock. On this Form 4, 5,597 shares of common stock were delivered at $29.36 per share to satisfy tax obligations tied to equity compensation. Following this transaction, he continues to hold 129,653 shares of CoStar Group common stock directly.
Glaser Rachel C reported acquisition or exercise transactions in this Form 4 filing.
CoStar Group director Rachel C. Glaser reported receiving a restricted stock award of 8,262 shares of common stock as compensation. The shares were granted at no cash cost on June 23, 2026 and increase her direct holdings to 12,419 shares after the award.
The restricted stock will vest in full on the earlier of the first anniversary of the grant date or the date of CoStar Group's 2027 Annual Meeting of Stockholders. This is a routine equity compensation grant and not an open-market purchase or sale.
CoStar Group director John L. Berisford received a restricted stock award of 8,262 shares of common stock. The grant was made at no cash cost per share and is classified as a compensation-related acquisition. After this award, he directly holds 11,235 CoStar Group shares.
The restricted stock vests in full on the earlier of the first anniversary of the grant date or the date of CoStar Group’s 2027 Annual Meeting of Stockholders, tying the award to both time-based service and the company’s future shareholder meeting.
Hill John W reported acquisition or exercise transactions in this Form 4 filing.
CoStar Group director John W. Hill received a grant of 8,262 shares of common stock as an equity award. The award was granted at no cash cost per share and is structured as restricted stock. Following this grant, Hill directly holds 26,493 shares.
The restricted stock award will vest in full on the earlier of the first anniversary of the grant date or the date of CoStar Group’s 2027 Annual Meeting of Stockholders. This is a compensation-related equity grant, not an open-market stock purchase or sale.
Brunner Angelique G. reported acquisition or exercise transactions in this Form 4 filing.
CoStar Group director Angelique G. Brunner received an equity grant of 8,262 shares of restricted common stock on June 23, 2026. The award carries no purchase price and represents stock-based compensation rather than an open-market transaction. The restricted shares vest in full on the earlier of the first anniversary of the grant date or the company’s 2027 Annual Meeting of Stockholders. Following this grant, Brunner directly holds 18,428 shares of CoStar Group common stock.
Musslewhite Robert W reported acquisition or exercise transactions in this Form 4 filing.
COSTAR GROUP, INC. director Robert W. Musslewhite received an equity grant of 8,262 shares of common stock as a restricted stock award. The award was granted at no cash cost to him and increases his direct holdings to 26,539 shares. According to the terms, the restricted stock vests in full on the earlier of the first anniversary of the grant date or the date of the company’s 2027 Annual Meeting of Stockholders, tying his compensation more closely to the company’s future performance and continued board service.
Sams Louise S reported acquisition or exercise transactions in this Form 4 filing.
CoStar Group director Louise S. Sams received a grant of 8,262 shares of restricted common stock at no purchase price. The award vests in full on the earlier of the first anniversary of the grant date or the company’s 2027 annual meeting of stockholders. After this grant, she directly holds 28,671 shares.
McCarthy Christine M reported acquisition or exercise transactions in this Form 4 filing.
COSTAR GROUP, INC. director Christine M. McCarthy received a grant of 8,262 shares of common stock as a restricted stock award. The award vests in full on the earlier of the first anniversary of the grant date or the Company’s 2027 Annual Meeting of Stockholders. After this grant and the inclusion of shares that were inadvertently omitted from a prior filing, she directly holds 11,585 shares.
CoStar Group’s Chief Accounting Officer Cynthia Cammett reported a routine tax-withholding transaction. On June 15, 2026, 461 shares of common stock were disposed of at $32.04 per share to cover tax obligations. After this non-market event, she directly holds 24,687 shares.
CoStar Group, Inc. President and CEO Andrew C. Florance reported buying additional company stock. He made two open-market purchases of the company’s common stock, totaling 71,430 shares. One trade covered 3,100 shares at $35.82 per share and the other 68,330 shares at $35.17 per share.
CoStar Group’s General Counsel and Secretary, Gene Boxer, reported a small tax-related share disposition. On this amended Form 4, 482 shares of common stock were withheld at a price of $43.63 per share to cover tax obligations. After this non‑market, tax-withholding transaction, Boxer directly holds 95,463 shares of CoStar Group common stock. A footnote states that the reported amount reflects a correction due to an administrative error, indicating this filing primarily updates prior data rather than reflecting a new trading decision.
CoStar Group Senior VP Lisa Ruggles reported a routine tax-withholding transaction involving company stock. On March 15, 2026, 2,977 shares of common stock were disposed of at $43.63 per share to cover tax obligations tied to equity compensation. After this non-market transaction, she directly holds 174,915 shares of CoStar Group common stock.
CoStar Group, Inc. General Counsel and Secretary Gene Boxer reported a small share disposition related to tax withholding. On March 15, 2026, 428 shares of common stock were delivered at a price of $43.63 per share to satisfy a tax liability. This was reported as a tax-withholding disposition rather than an open-market sale. Following the transaction, Boxer continued to hold 95,517 shares of CoStar common stock directly.
CoStar Group Chief Technology Officer Frank Simuro reported a tax-withholding disposition of 11,107 shares of common stock. The shares were valued at $43.63 each, based on the Nasdaq closing price on March 13, 2026. After this transaction, he directly holds 414,491 shares.
CoStar Group’s Chief Human Resources Officer Michael J. Desmarais reported a tax-withholding disposition of 2,873 shares of common stock at $43.63 per share. This type F transaction reflects shares withheld to cover taxes, not an open-market sale. He now directly holds 87,725 shares.
COSTAR GROUP, INC. Chief Accounting Officer Cynthia Cammett reported a routine tax-related share disposition. On March 15, 2026, 1,194 shares of common stock were withheld at a price of $43.63 per share to cover tax obligations, rather than sold on the open market. Following this transaction, she directly holds 25,148 shares, indicating she retains the vast majority of her equity position.
CoStar Group, Inc. reported that Chief Accounting Officer Cynthia Cammett received an award of 4,374 shares of common stock as compensation. Under the Management Stock Purchase Plan, part of her annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and she was granted an equal number of Restricted Stock Units that vest in full after four years. Following this grant, she directly holds 26,342 shares of CoStar common stock.
CoStar Group, Inc. reported that President and CEO Andrew C. Florance acquired 124,162 shares of common stock through an equity award. Under a Management Stock Purchase Plan, his annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and he received Restricted Stock Units for an equal number of shares that vest in full after four years. Following this grant, he directly holds 1,651,435.03 shares of CoStar common stock, reflecting a sizable, compensation-related increase rather than an open-market purchase.
CoStar Group’s Chief Financial Officer Christian M. Lown received an equity compensation award tied to his annual incentive. On March 10, 2026, he was granted 12,268 shares of common stock at no cash cost to him, recorded as a grant or award acquisition. According to the company’s Management Stock Purchase Plan, all or part of his annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and he was awarded an equal number of Restricted Stock Units that vest in full after four years. Following this grant, Lown directly holds 135,250 shares of CoStar Group common stock.
CoStar Group’s General Counsel and Secretary, Gene Boxer, received a stock-based compensation award. On March 10, 2026, he acquired 21,920 shares of CoStar Group common stock at a stated price of $0.00 per share, bringing his direct holdings to 95,945 shares.
According to the footnote, under the Management Stock Purchase Plan, all or part of his annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and the company granted an equal number of Restricted Stock Units that vest in full after four years. This is a compensation-related, non-market transaction rather than an open-market purchase or sale.
CoStar Group’s Chief Human Resources Officer, Michael J. Desmarais, received a grant of 17,676 shares of common stock as reported on a Form 4. These shares were acquired at a reported price of $0.00 per share, reflecting a compensation-related award rather than a market purchase.
According to the footnote, a portion of his annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and he was also awarded an equal number of Restricted Stock Units that vest in full after four years. Following this award, Desmarais directly owns 90,598 shares of CoStar Group common stock.
CoStar Group director buys additional shares. Louise S. Sams, a director of CoStar Group, Inc., purchased 1000 shares of common stock in an open-market transaction at a price of $48.3600 per share. Following this purchase, Sams directly holds a total of 20409 CoStar Group shares.
CoStar Group Chief Financial Officer Christian M. Lown reported a mix of equity award and tax-related share disposition. He received 39,652 restricted stock units, each equal to one CoStar common share, vesting in three equal installments on March 1 of 2027, 2028, and 2029. To cover tax withholding, 7,175 common shares were disposed of at $44.63 per share, leaving him with 122,982 common shares held directly.
SAINT FREDERICK G. reported acquisition or exercise transactions in this Form 4 filing.
CoStar Group reported that Frederick G. Saint, President, Marketplaces, received a grant of 39,652 restricted stock units. Each unit represents a contingent right to receive one share of CoStar Group common stock. The units vest in three equal installments on March 1, 2027, March 1, 2028, and March 1, 2029.
CoStar Group President and CEO Andrew C. Florance reported a mix of equity compensation events. He received a grant of 83,708 restricted stock units on February 27, 2026, each representing a contingent right to one share of CoStar Group common stock. These units vest in three equal installments on March 1, 2027, March 1, 2028, and March 1, 2029.
On March 1, 2026, 59,593 shares of common stock were disposed of at $44.63 per share in a tax-withholding transaction to cover obligations associated with equity awards. After this disposition, he directly owned 1,527,273.03 shares of common stock, in addition to the 83,708 restricted stock units.
CoStar Group General Counsel and Secretary Gene Boxer reported two equity-related transactions. He received 26,888 restricted stock units on February 27, 2026, each representing one share of common stock. These RSUs vest in three equal installments on March 1, 2027, 2028 and 2029.
On March 1, 2026, Boxer had 4,547 shares of common stock disposed in a tax-withholding transaction at $44.63 per share, corresponding to the prior Nasdaq closing price. After this, he directly owned 74,025 common shares and 26,888 RSUs.
CoStar Group Chief Human Resources Officer Michael J. Desmarais reported routine equity compensation activity. He received a grant of 17,926 restricted stock units, each representing one future share of CoStar Group common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028, and March 1, 2029.
To cover tax obligations, 6,353 shares of common stock were disposed of at a price of $44.63 per share through a tax-withholding transaction rather than an open-market sale. Following these transactions, Desmarais directly held 72,922 shares of CoStar Group common stock.
CoStar Group Chief Accounting Officer Cynthia Cammett reported routine equity compensation activity. She received a grant of 6,834 restricted stock units, each representing the right to receive one share of CoStar common stock, with no purchase price.
The restricted stock units vest in four equal installments on March 1, 2027, 2028, 2029, and 2030. In a separate transaction, 1,385 shares of common stock were withheld at a price of $44.63 per share to cover tax obligations, leaving her with 21,968 common shares held directly, including 142 shares acquired under the employee stock purchase plan.
CoStar Group, Inc. executive Lisa Ruggles reported offsetting equity transactions. She received a grant of 28,197 restricted stock units on February 27, 2026, each representing one future share of common stock. These RSUs vest in three equal installments on March 1, 2027, March 1, 2028, and March 1, 2029.
To cover tax obligations related to equity compensation, 8,931 shares of common stock were disposed of on March 1, 2026 through a tax-withholding transaction at a reference price of $44.63 per share. After these transactions, she directly held 177,892 shares of common stock and 28,197 RSUs.
CoStar Group Chief Technology Officer Frank Simuro received a grant of 52,869 restricted stock units, each representing one future share of common stock. The units vest in three equal installments on March 1, 2027, 2028 and 2029. To cover tax obligations, 18,702 common shares were disposed of through a tax-withholding transaction at a price of $44.63 per share, leaving him with 425,598 common shares held directly.
COSTAR GROUP, INC. director Rachel C. Glaser reported an open-market purchase of 1,000 shares of common stock at a price of $44.94 per share. After this transaction, she directly owns 4,157 shares. The reported amount includes shares that were previously omitted from an earlier filing.
CoStar Group, Inc. President, Marketplaces, Frederick G. Saint reported mixed share movements involving the company’s common stock. On March 2, 2026, he made an open-market purchase of 20,000 shares at an average price of $45.33 per share, increasing his directly held stake. On March 1, 2026, 11,096 shares were disposed of to cover tax obligations, using a price of $44.63–$44.63 as referenced in the filing. After these transactions, he directly owned 279,851 shares of CoStar Group common stock.
CoStar Group, Inc. President and CEO Andrew C. Florance reported an open-market purchase of 55,720 shares of common stock at an average price of $44.52 per share. Following this transaction, his directly held stake increased to 1,586,866.03 shares.
CoStar Group, Inc. Chief Technology Officer Frank Simuro reported two share dispositions related to equity compensation. He forfeited 30,727 shares of common stock back to the issuer from a February 14, 2023 performance restricted stock grant after the Compensation Committee certified the performance goal. He also disposed of 4,421 shares at $49.07 per share to satisfy tax withholding obligations, based on the February 19, 2026 Nasdaq closing price. After these non-market transactions, he directly owns 444,300 shares of CoStar Group common stock.
CoStar Group President, Marketplaces Frederick G. Saint reported two dispositions of CoStar Group common stock on February 19, 2026. He forfeited 17,583 shares to the company at $0.00 per share upon certification of performance results from a February 14, 2023 performance restricted stock grant. He also disposed of 2,149 shares at $49.07 per share to cover tax obligations, using shares to pay the exercise price or tax liability. After these transactions, he held 270,947 shares of CoStar Group common stock directly. The footnotes note that the closing price of the company’s common stock on Nasdaq on February 19, 2026 was $49.07 per share.
CoStar Group CEO Andrew C. Florance reported two share dispositions in company stock. He forfeited 104,983 shares of common stock back to the issuer from a February 14, 2023 performance-based restricted stock grant after the Compensation Committee certified actual performance. He also disposed of 19,221 shares to cover tax liabilities, valued at $49.07 per share, based on the Nasdaq closing price on February 19, 2026. After these transactions, he directly owned 1,531,146.03 shares of CoStar Group common stock.
COSTAR GROUP, INC. Senior VP of Global Operations Lisa Ruggles reported two disposals of common stock tied to equity compensation on February 19, 2026. She transferred 17,583 shares back to the company in an issuer disposition following certification of performance results from a February 14, 2023 performance stock grant. She also disposed of 3,219 shares at $49.07 per share to cover tax obligations related to her award. After these transactions, she directly owns 186,823 shares of CoStar Group common stock.
CoStar Group Chief Technology Officer Frank Simuro reported a tax-related share disposition. On February 15, 2026, he disposed of 4,151 shares of CoStar Group common stock in a tax-withholding transaction valued at $44.99 per share. After this withholding-related disposition, he directly owned 479,448 shares of common stock.
CoStar Group President and CEO Andrew C. Florance reported a tax-related share disposition. On a Form 4, he disclosed the withholding of 17,482 shares of common stock at $44.99 per share to cover tax obligations, using the prior Nasdaq closing price. After this transaction, he directly holds 1,655,350.03 CoStar common shares.
CoStar Group Senior VP Lisa Ruggles reported a tax-related share disposition. On February 15, 2026, she disposed of 3,576 shares of CoStar Group common stock at $44.99 per share through a tax-withholding transaction, rather than an open-market sale. After this transaction, she directly owned 207,625 shares of CoStar Group common stock. A footnote notes that the Nasdaq closing price of the company’s stock on the prior business day, February 13, 2026, was $44.99, which aligns with the transaction price.
CoStar Group, Inc. reported that President, Marketplaces Frederick G. Saint disposed of company shares to cover tax obligations tied to equity compensation. The Form 4 shows a tax-withholding disposition of 2,424 shares of common stock at a reference price of $44.99 per share. After this withholding event, Saint directly owned 290,679 shares of CoStar Group common stock.
CoStar Group, Inc. director reports stock sale in Form 4 filing. A company director filed a Form 4 disclosing the sale of 2,250 shares of CoStar Group common stock on 11/13/2025 at a price of $68.68 per share. After this transaction, the director beneficially owns 18,231 shares of CoStar Group common stock in direct ownership form. This is a routine insider trading disclosure required under U.S. securities laws.
CoStar Group, Inc. reported an insider stock sale by its Chief Accounting Officer. On 11/13/2025, the officer sold 1,841 shares of CoStar Group common stock at an average price of $68.79 per share. The filing notes this average is based on sales prices ranging from $68.78 to $68.85. After this transaction, the officer directly beneficially owned 23,211 shares of CoStar Group common stock.