Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| COSTAR GROUP, INC.CSGP · Entity 3416 | General Counsel and Secretary | March 15, 2026 | March 17, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
COSTAR GROUP, INC.
Report date March 15, 2026 · Filed March 17, 2026 · Amendment
Amendment: balances below belong to this corrected disclosure, not necessarily a complete replacement of earlier positions.
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common Stock, par value $0.01 per shareSEC Table I · non-derivative | Direct | 95,463 |
Reported balance
After 2026-03-15 transaction · row 1
Amendment: may correct only part of an earlier disclosure.
1 source rowRow 1 · 2026-03-15 · Tax withholding · Disposed 482 · Balance 95,463 F1: This amount reflects a correction due to administrative error. F2: On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. |
Filing footnotes · ownership attribution and instrument terms
F1: This amount reflects a correction due to administrative error.
F2: On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63.
Past disclosures · reporting ended (1)
No longer tracked through insider filings. These historical balances do not imply present ownership or a zero position.
Sirius International Insurance Group, Ltd.
Report date February 26, 2021 · Filed March 02, 2021
Section 16 reporting ended · disclosed 2021-03-02. Current position is not established by this disclosure.
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common SharesSEC Table I · non-derivative | Direct | 0 |
Ending reported balance
After 2021-02-26 transaction · row 2
2 source rows · reconciled sequenceRow 1 · 2021-02-26 · Disposition to issuer · Disposed 8,049 · Balance 97,646 F1: Represents shares of common stock of the issuer ("Sirius Shares") disposed of in connection with the merger of the issuer with Third Point Reinsurance Ltd. ("TPRE") (the "Merger"), which closed on February 26, 2021 (the "Effective Time"), and exchanged for a combination of common shares, par value $0.10 per share, of TPRE (the "TPRE Shares") and contingent value right ("CVR") consideration comprising (1) 0.743 of a TPRE Share and (2) one contractual CVR, which represents the right to receive a contingent cash payment, which, taken together with the fraction of the TPRE Share received, guarantee that on the second anniversary of the Effective Time, the electing shareholder will have received equity and cash equal to at least $13.73 per Sirius Share. Row 2 · 2021-02-26 · Disposition to issuer · Disposed 97,646 · Balance 0 F2: Represents restricted stock units ("RSUs") scheduled to vest in full on the third anniversary of grant date (or on February 27, 2022). These RSUs were disposed of in connection with the Merger and exchanged for 126,685 RSUs of TPRE common shares that immediately vested following the closing of the Merger and will be settled, net of shares withheld for taxes, for cash at the public trading price on the day of the cash-out. |
Filing footnotes · ownership attribution and instrument terms
F1: Represents shares of common stock of the issuer ("Sirius Shares") disposed of in connection with the merger of the issuer with Third Point Reinsurance Ltd. ("TPRE") (the "Merger"), which closed on February 26, 2021 (the "Effective Time"), and exchanged for a combination of common shares, par value $0.10 per share, of TPRE (the "TPRE Shares") and contingent value right ("CVR") consideration comprising (1) 0.743 of a TPRE Share and (2) one contractual CVR, which represents the right to receive a contingent cash payment, which, taken together with the fraction of the TPRE Share received, guarantee that on the second anniversary of the Effective Time, the electing shareholder will have received equity and cash equal to at least $13.73 per Sirius Share.
F2: Represents restricted stock units ("RSUs") scheduled to vest in full on the third anniversary of grant date (or on February 27, 2022). These RSUs were disposed of in connection with the Merger and exchanged for 126,685 RSUs of TPRE common shares that immediately vested following the closing of the Merger and will be settled, net of shares withheld for taxes, for cash at the public trading price on the day of the cash-out.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| March 15, 2026 Filed Mar 17, 2026 21:47 UTC Amendment | COSTAR GROUP, INC. CSGP · Entity 3416 | Tax withholdingCommon Stock, par value $0.01 per share | 482 | $43.63 | $21,029.66 |
DisclosureSEC source: 0001758152-26-000008 · wk-form4a_1773784075.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 95,463 F1 · shares: This amount reflects a correction due to administrative error. F2 · price: On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. Read SEC document |
| March 15, 2026 Filed Mar 17, 2026 20:12 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | Tax withholdingCommon Stock, par value $0.01 per share | 428 | $43.63 | $18,673.64 |
DisclosureSEC source: 0001758152-26-000006 · wk-form4_1773778356.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 95,517 F1 · price: On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. Read SEC document |
| March 10, 2026 Filed Mar 11, 2026 21:18 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | GrantCommon Stock, par value $0.01 per share | 21,920 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001758152-26-000004 · wk-form4_1773263882.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 95,945 F1 · price: Pursuant to the Management Stock Purchase Plan, all or a portion of the reporting person's annual cash incentive amount was converted to Deferred Stock Units (each equivalent to one share of common stock) at $46.34 per unit, and the Company awarded the reporting person Restricted Stock Units that vest in full after four years for an equal number of shares of common stock. Read SEC document |
| March 01, 2026 Filed Mar 4, 2026 00:06 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | Tax withholdingCommon Stock, par value $0.01 per share | 4,547 | $44.63 | $202,932.61 |
DisclosureSEC source: 0001758152-26-000002 · wk-form4_1772582780.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 74,025 F1 · price: On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. Read SEC document |
| February 27, 2026 Filed Mar 4, 2026 00:06 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | GrantRestricted Stock Units · Derivative | 26,888 | $0.00 | $0.00 |
DisclosureSEC source: 0001758152-26-000002 · wk-form4_1772582780.xml · derivative · entry 2 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 26,888 Underlying: Common Stock, par value $0.01 per share · 26,888 shares Expires not disclosed F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. F3 · derivative.exercise_date: The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. F3 · derivative.expiration_date: The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. Read SEC document |
| March 15, 2025 Filed Mar 19, 2025 00:34 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | Tax withholdingCommon Stock, par value $0.01 per share | 481 | $78.73 | $37,869.13 |
DisclosureSEC source: 0001057352-25-000058 · wk-form4_1742344442.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 78,572 Read SEC document |
| March 05, 2025 Filed Mar 7, 2025 23:06 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | GrantCommon Stock, par value $0.01 per share | 12,492 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001057352-25-000047 · wk-form4_1741388785.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 79,053 F1 · price: Pursuant to the Management Stock Purchase Plan, all or a portion of the reporting person's annual cash incentive amount was converted to Deferred Stock Units (each equivalent to one share of common stock) at $77.81 per unit, and the Company awarded the reporting person Restricted Stock Units that vest in full after four years for an equal number of shares of common stock. Read SEC document |
| March 01, 2025 Filed Mar 4, 2025 00:10 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | Tax withholdingCommon Stock, par value $0.01 per share | 3,644 | $76.25 | $277,855.00 |
DisclosureSEC source: 0001057352-25-000036 · wk-form4_1741047014.xml · nonDerivative · entry 2 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 66,561 Read SEC document |
| February 27, 2025 Filed Mar 4, 2025 00:10 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | GrantCommon Stock, par value $0.01 per share | 26,897 | $0.00 | $0.00 |
DisclosureSEC source: 0001057352-25-000036 · wk-form4_1741047014.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 70,205 Read SEC document |
| March 15, 2024 Filed Mar 19, 2024 20:16 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | Tax withholdingCommon Stock, par value $0.01 per share | 372 | $87.87 | $32,687.64 |
DisclosureSEC source: 0001057352-24-000049 · wk-form4_1710879385.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 43,308 Read SEC document |
| March 01, 2024 Filed Mar 5, 2024 21:32 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | Tax withholdingCommon Stock, par value $0.01 per share | 1,238 | $87.03 | $107,743.14 |
DisclosureSEC source: 0001057352-24-000037 · wk-form4_1709674328.xml · nonDerivative · entry 2 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 43,680 Read SEC document |
| March 01, 2024 Filed Mar 5, 2024 21:32 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | GrantCommon Stock, par value $0.01 per share | 8,694 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001057352-24-000037 · wk-form4_1709674328.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 44,918 F1 · price: Pursuant to the Management Stock Purchase Plan, all or a portion of the reporting person's annual cash incentive amount was converted to Deferred Stock Units (each equivalent to one share of common stock) at $88.27 per unit, and the Company awarded the reporting person Restricted Stock Units that vest in full after four years for an equal number of shares of common stock. Read SEC document |
| February 22, 2024 Filed Feb 27, 2024 01:08 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | GrantCommon Stock, par value $0.01 per share | 18,189 | $0.00 | $0.00 |
DisclosureSEC source: 0001057352-24-000022 · wk-form4_1708996113.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 36,224 Read SEC document |
| March 15, 2023 Filed Mar 17, 2023 21:31 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | Tax withholdingCommon Stock, par value $0.01 per share | 371 | $67.62 | $25,087.02 |
DisclosureSEC source: 0001057352-23-000055 · wf-form4_167908867297731.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 18,035 Read SEC document |
| February 24, 2023 Filed Feb 27, 2023 22:05 UTC | COSTAR GROUP, INC. CSGP · Entity 3416 | GrantCommon Stock, par value $0.01 per share | 14,139 | $70.73 | $1,000,051.47 |
DisclosureSEC source: 0001057352-23-000034 · wf-form4_167753550700502.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · General Counsel and Secretary 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 18,406 F1 · shares: Represents a grant of 14,139 shares of restricted common stock that vest in four equal installments on March 1, 2024, March 1, 2025, March 1, 2026, and March 1, 2027. Read SEC document |
| February 26, 2021 Filed Mar 2, 2021 20:38 UTC | Sirius International Insurance Group, Ltd. SG · Entity 141984 | Disposition to issuerCommon Shares | 97,646 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001140361-21-007038 · form4.xml · nonDerivative · entry 2 Boxer Gene · CIK 0001758152 · EVP, CSO & Group Gen. Counsel 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 0 F2 · price: Represents restricted stock units ("RSUs") scheduled to vest in full on the third anniversary of grant date (or on February 27, 2022). These RSUs were disposed of in connection with the Merger and exchanged for 126,685 RSUs of TPRE common shares that immediately vested following the closing of the Merger and will be settled, net of shares withheld for taxes, for cash at the public trading price on the day of the cash-out. Read SEC document |
| February 26, 2021 Filed Mar 2, 2021 20:38 UTC | Sirius International Insurance Group, Ltd. SG · Entity 141984 | Disposition to issuerCommon Shares | 8,049 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001140361-21-007038 · form4.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · EVP, CSO & Group Gen. Counsel 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 97,646 F1 · price: Represents shares of common stock of the issuer ("Sirius Shares") disposed of in connection with the merger of the issuer with Third Point Reinsurance Ltd. ("TPRE") (the "Merger"), which closed on February 26, 2021 (the "Effective Time"), and exchanged for a combination of common shares, par value $0.10 per share, of TPRE (the "TPRE Shares") and contingent value right ("CVR") consideration comprising (1) 0.743 of a TPRE Share and (2) one contractual CVR, which represents the right to receive a contingent cash payment, which, taken together with the fraction of the TPRE Share received, guarantee that on the second anniversary of the Effective Time, the electing shareholder will have received equity and cash equal to at least $13.73 per Sirius Share. Read SEC document |
| February 27, 2019 Filed Mar 1, 2019 18:31 UTC | Sirius International Insurance Group, Ltd. SG · Entity 141984 | Tax withholdingCommon Shares | 4,553 | $12.75 | $58,050.75 |
DisclosureSEC source: 0001104659-19-012141 · a4.xml · nonDerivative · entry 4 Boxer Gene · CIK 0001758152 · EVP, CSO & Group Gen. Counsel 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 105,695 Read SEC document |
| February 27, 2019 Filed Mar 1, 2019 18:31 UTC | Sirius International Insurance Group, Ltd. SG · Entity 141984 | GrantCommon Shares | 74,117 | $0.00 | $0.00 |
DisclosureSEC source: 0001104659-19-012141 · a4.xml · nonDerivative · entry 3 Boxer Gene · CIK 0001758152 · EVP, CSO & Group Gen. Counsel 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 110,248 Read SEC document |
| February 27, 2019 Filed Mar 1, 2019 18:31 UTC | Sirius International Insurance Group, Ltd. SG · Entity 141984 | GrantCommon Shares | 23,529 | $0.00 | $0.00 |
DisclosureSEC source: 0001104659-19-012141 · a4.xml · nonDerivative · entry 2 Boxer Gene · CIK 0001758152 · EVP, CSO & Group Gen. Counsel 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 36,131 Read SEC document |
| February 27, 2019 Filed Mar 1, 2019 18:31 UTC | Sirius International Insurance Group, Ltd. SG · Entity 141984 | GrantCommon Shares | 11,602 | $0.00 | $0.00 |
DisclosureSEC source: 0001104659-19-012141 · a4.xml · nonDerivative · entry 1 Boxer Gene · CIK 0001758152 · EVP, CSO & Group Gen. Counsel 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 12,602 Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.