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The number of shares was determined by dividing the cash retainer by the closing price on the date of grant."}],"balance_after":6846,"source":{"system":"sec-edgar","filing":"0001341358-26-000003","document":"wk-form4_1782763903.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000134135826000003/wk-form4_1782763903.xml","form_type":"4"}},{"id":724464,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock Class A","published_at":"2026-06-29T20:11:49.000Z","date":"2026-06-25","kind":"grant","planned":false,"acquired":true,"shares":645,"price":225,"value":145125.0,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents a grant of fully vested shares of Class A Common Stock issued to the Reporting Person as part of the Issuer's annual equity compensation program for non-employee directors under the CME Group Director Stock Plan. 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For reporting purposes, the sale prices within $1 range have been aggregated and the weighted average has been reported. The price range was $272.21 to $272.90. The Company maintains a record of the transaction and copies will be provided upon request."}],"balance_after":5400,"source":{"system":"sec-edgar","filing":"0001156375-25-000123","document":"wk-form4_1747659794.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637525000123/wk-form4_1747659794.xml","form_type":"4"}},{"id":1468953,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock Class A","published_at":"2024-06-27T00:48:10.000Z","date":"2024-06-25","kind":"grant","planned":false,"acquired":true,"shares":1237,"price":194.1,"value":240101.7,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Granted pursuant to the CME Group Director Stock Plan, as amended and restated."}],"balance_after":8400,"source":{"system":"sec-edgar","filing":"0001156375-24-000132","document":"wk-form4_1719449284.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637524000132/wk-form4_1719449284.xml","form_type":"4"}},{"id":1479524,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock Class A","published_at":"2024-06-14T14:19:40.000Z","date":"2024-06-13","kind":"sale","planned":false,"acquired":false,"shares":3000,"price":195.44,"value":586320.0,"ownership":{"direct":false,"nature":"by Trust"},"balance_after":7163,"source":{"system":"sec-edgar","filing":"0001156375-24-000093","document":"wk-form4_1718374773.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637524000093/wk-form4_1718374773.xml","form_type":"4"}},{"id":1575081,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock, Series B-4","published_at":"2024-03-15T20:20:12.000Z","date":"2023-10-10","kind":"sale","planned":false,"acquired":false,"shares":1,"price":216.09,"value":216.09,"ownership":{"direct":false,"nature":"by Partnership"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"This Form 5 is being filed to reflect an update to Mr. Carey's ownership of Class B shares that were previously reported as being indirectly owned by Mr. Carey in connection with his ownership of HC Technologies. Subsequent to the sale of HC Technologies' assets, one Class B-4 share was sold on October 10, 2023.  The Class B common stock of CME Group Inc. is not listed on a national securities exchange or traded in an organized over-the-counter market. Each class of the Class B common stock is associated with a membership in a specific division of the exchange. We assume that because the Class B shares have the same equitable interest in our earnings and the same dividend payments as our Class A shares, that if reported separately from the associated trading rights, they would have the same market price as our Class A common stock.  The closing price for our Class A common stock on October 10, 2023 was $216.09."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001156375-24-000016","document":"wk-form5_1710534001.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637524000016/wk-form5_1710534001.xml","form_type":"5"}},{"id":1575080,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock, Series B-3","published_at":"2024-03-15T20:20:12.000Z","date":"2023-10-09","kind":"sale","planned":false,"acquired":false,"shares":1,"price":215.76,"value":215.76,"ownership":{"direct":false,"nature":"by Partnership"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"This Form 5 is being filed to reflect an update to Mr. Carey's ownership of Class B shares that were previously reported as being indirectly owned by Mr. Carey in connection with his ownership of HC Technologies. Subsequent to the sale of HC Technologies' assets,  one Class B-1 share and one Class B-3 share were sold on October 9, 2023.  The Class B common stock of CME Group Inc. is not listed on a national securities exchange or traded in an organized over-the-counter market. Each class of the Class B common stock is associated with a membership in a specific division of the exchange. We assume that because the Class B shares have the same equitable interest in our earnings and the same dividend payments as our Class A shares, that if reported separately from the associated trading rights, they would have the same market price as our Class A common stock.  The closing price for our Class A common stock on October 9, 2023 was $215.76"}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001156375-24-000016","document":"wk-form5_1710534001.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637524000016/wk-form5_1710534001.xml","form_type":"5"}},{"id":1575079,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock, Series B-1","published_at":"2024-03-15T20:20:12.000Z","date":"2023-10-09","kind":"sale","planned":false,"acquired":false,"shares":1,"price":215.76,"value":215.76,"ownership":{"direct":false,"nature":"by Partnership"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"This Form 5 is being filed to reflect an update to Mr. Carey's ownership of Class B shares that were previously reported as being indirectly owned by Mr. Carey in connection with his ownership of HC Technologies. Subsequent to the sale of HC Technologies' assets,  one Class B-1 share and one Class B-3 share were sold on October 9, 2023.  The Class B common stock of CME Group Inc. is not listed on a national securities exchange or traded in an organized over-the-counter market. Each class of the Class B common stock is associated with a membership in a specific division of the exchange. We assume that because the Class B shares have the same equitable interest in our earnings and the same dividend payments as our Class A shares, that if reported separately from the associated trading rights, they would have the same market price as our Class A common stock.  The closing price for our Class A common stock on October 9, 2023 was $215.76"}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001156375-24-000016","document":"wk-form5_1710534001.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637524000016/wk-form5_1710534001.xml","form_type":"5"}},{"id":1575078,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock, Series B-2","published_at":"2024-03-15T20:20:12.000Z","date":"2023-10-06","kind":"sale","planned":false,"acquired":false,"shares":1,"price":211.93,"value":211.93,"ownership":{"direct":false,"nature":"by Partnership"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This Form 5 is being filed to reflect an update to Mr. Carey's ownership of Class B shares that were previously reported as being indirectly owned by Mr. Carey in connection with his ownership of HC Technologies.  Subsequent to the sale of HC Technologies' assets, one Class B-2 share was sold on  October 6, 2023.  The Class B common stock of CME Group Inc. is not listed on a national securities exchange or traded in an organized over-the-counter market. Each class of the Class B common stock is associated with a membership in a specific division of the exchange. We assume that because the Class B shares have the same equitable interest in our earnings and the same dividend payments as our Class A shares, that if reported separately from the associated trading rights, they would have the same market price as our Class A common stock.  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This amendment is being filed to correctly report the amount as 10,675 shares held indirectly through Mr. Carey' Trust."}],"balance_after":10675,"source":{"system":"sec-edgar","filing":"0001156375-22-000055","document":"wf-form4a_164488610360070.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637522000055/wf-form4a_164488610360070.xml","form_type":"4/A","original_submission_date":"2022-01-26"}},{"id":2398660,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock Class 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reflect the correct allocation of Mr. Carey's shares that are held indirectly as of December 31, 2021, which were incorrectly reflected on his prior filings."}],"balance_after":10785,"source":{"system":"sec-edgar","filing":"0001156375-22-000054","document":"wf-form5_164488601207836.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637522000054/wf-form5_164488601207836.xml","form_type":"5"}},{"id":2425416,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock Class 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The price ranges were: $178.83 to $178.93 and $179.02 to $179.80."}],"balance_after":18141,"source":{"system":"sec-edgar","filing":"0001156375-19-000041","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1156375/000115637519000041/edgardoc.xml","form_type":"4"}},{"id":3753773,"issuer":{"id":2909,"kind":"organization","name":"CME GROUP INC.","symbol":"CME"},"owners":[{"id":34902,"kind":"person","name":"Carey Charles P","position":1,"cik":"0001341358","reported_name":"Carey Charles P","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock Class A","published_at":"2018-11-23T14:58:22.000Z","date":"2018-11-21","kind":"sale","acquired":false,"shares":2000,"price":192.15,"value":384300.0,"ownership":{"direct":false,"nature":"by Firm"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"On November 21, 2018, Mr. Carey sold an aggregate of 2,000 shares of CME Group Class A common stock. 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