Quarterly report [Sections 13 or 15(d)]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]  
Schedule of Investment Income
A presentation of total investment income Main Street earned from its Investment Portfolio in each of the periods presented is as follows:
Three Months Ended
March 31,
2026
2025
(in thousands)
Interest, dividend and fee income:
Interest income $ 105,306  $ 98,017 
Dividend income 28,196  36,026 
Fee income 6,604  3,003 
Total investment income $ 140,106  $ 137,046