0001653384 2022-08-03 0001653384 rway:SevenPointFiveZeroPercentageNotesDueTwoThousandTwentySevenMember 2022-01-01 2022-06-30 0001653384 2022-01-01 2022-06-30 0001653384 us-gaap:CommonStockMember 2022-01-01 2022-06-30 shares 0001653384 --12-31 Q2 false 10-Q true 2022-06-30 2022 false 814-01180 Runway Growth Finance Corp. MD 47-5049745 205 N. Michigan Ave. Suite 4200 Chicago IL 60601 312 281‑6270 Common Stock, par value $0.01 per share 7.50% Notes due 2027 RWAY RWAYL NASDAQ NASDAQ Yes Yes Non-accelerated Filer false true false false 40759727