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These shares were sold in multiple transactions at prices ranging from $19.40 to $20.05, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":21072,"source":{"system":"sec-edgar","filing":"0001104659-25-096752","document":"tm2528001-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925096752/tm2528001-1_4seq1.xml","form_type":"4"}},{"id":1025901,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-03T21:40:12.000Z","date":"2025-10-01","kind":"sale","planned":false,"acquired":false,"shares":75000,"price":19.7596,"value":1481970.0,"ownership":{"direct":false,"nature":"By Hallador Alternative Assets Fund LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.40 to $20.05, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1584929,"source":{"system":"sec-edgar","filing":"0001104659-25-096752","document":"tm2528001-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925096752/tm2528001-1_4seq1.xml","form_type":"4"}},{"id":1030102,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-01T22:57:00.000Z","date":"2025-09-30","kind":"sale","planned":false,"acquired":false,"shares":25000,"price":19.5285,"value":488212.5,"ownership":{"direct":false,"nature":"By David Hardie Separate Property Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.40 to $19.685, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":46072,"source":{"system":"sec-edgar","filing":"0001104659-25-095738","document":"tm2527776-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925095738/tm2527776-1_4seq1.xml","form_type":"4"}},{"id":1030101,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-01T22:57:00.000Z","date":"2025-09-30","kind":"sale","planned":false,"acquired":false,"shares":75000,"price":19.5285,"value":1464637.5,"ownership":{"direct":false,"nature":"By Hallador Alternative Assets Fund LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.40 to $19.685, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1659929,"source":{"system":"sec-edgar","filing":"0001104659-25-095738","document":"tm2527776-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925095738/tm2527776-1_4seq1.xml","form_type":"4"}},{"id":1030100,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-01T22:57:00.000Z","date":"2025-09-29","kind":"sale","planned":false,"acquired":false,"shares":18446,"price":19.6484,"value":362434.3864,"ownership":{"direct":false,"nature":"By David Hardie Separate Property Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $19.50 to $19.87, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1734929,"source":{"system":"sec-edgar","filing":"0001104659-25-095738","document":"tm2527776-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925095738/tm2527776-1_4seq1.xml","form_type":"4"}},{"id":1031489,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-09-29T20:59:13.000Z","date":"2025-09-26","kind":"sale","planned":false,"acquired":false,"shares":19467,"price":19.1815,"value":373406.2605,"ownership":{"direct":false,"nature":"By David Hardie Separate Property Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.10 to $19.53, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":89518,"source":{"system":"sec-edgar","filing":"0001104659-25-094557","document":"tm2527446-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925094557/tm2527446-1_4seq1.xml","form_type":"4"}},{"id":1031488,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-09-29T20:59:13.000Z","date":"2025-09-26","kind":"sale","planned":false,"acquired":false,"shares":58401,"price":19.1815,"value":1120218.7815,"ownership":{"direct":false,"nature":"By Hallador Alternative Assets Fund LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $19.05 to $19.30, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":117731,"source":{"system":"sec-edgar","filing":"0001104659-25-092939","document":"tm2526861-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925092939/tm2526861-1_4seq1.xml","form_type":"4"}},{"id":1033516,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-09-24T20:04:50.000Z","date":"2025-09-23","kind":"sale","planned":false,"acquired":false,"shares":6577,"price":19.0845,"value":125518.7565,"ownership":{"direct":false,"nature":"By Hallador Alternative Assets Fund LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.05 to $19.30, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1874903,"source":{"system":"sec-edgar","filing":"0001104659-25-092939","document":"tm2526861-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/788965/000110465925092939/tm2526861-1_4seq1.xml","form_type":"4"}},{"id":1033515,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-09-24T20:04:50.000Z","date":"2025-09-22","kind":"sale","planned":false,"acquired":false,"shares":19165,"price":19.2546,"value":369014.409,"ownership":{"direct":false,"nature":"By David Hardie Separate Property Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $9.40 to $9.47, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1726762,"source":{"system":"sec-edgar","filing":"0001144204-16-138819","document":"v454763_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/788965/000114420416138819/v454763_4.xml","form_type":"4"}},{"id":4527877,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2016-12-09T23:27:59.000Z","date":"2016-11-14","kind":"sale","acquired":false,"shares":5900,"price":9.9051,"value":58440.09,"ownership":{"direct":false,"nature":"By Hallador Alternative Assets Fund LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.90 to $9.935, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1736462,"source":{"system":"sec-edgar","filing":"0001144204-16-138819","document":"v454763_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/788965/000114420416138819/v454763_4.xml","form_type":"4"}},{"id":4527876,"issuer":{"id":5143,"kind":"organization","name":"HALLADOR ENERGY CO"},"owners":[{"id":70660,"kind":"person","name":"HARDIE DAVID C","position":1,"cik":"0001166809","reported_name":"HARDIE DAVID C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2016-12-09T23:27:59.000Z","date":"2016-11-10","kind":"sale","acquired":false,"shares":15850,"price":10.0393,"value":159122.905,"ownership":{"direct":false,"nature":"By Hallador Alternative Assets Fund LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.025 to $10.08, inclusive."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The reporting person undertakes to provide to Hallador Energy Company, or any security holder of Hallador Energy Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes to this Form 4."}],"balance_after":1742362,"source":{"system":"sec-edgar","filing":"0001144204-16-138819","document":"v454763_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/788965/000114420416138819/v454763_4.xml","form_type":"4"}}]}