DIVIDENDS, DISTRIBUTIONS AND TAXABLE INCOME (Tables)

3 Months Ended

Mar. 31, 2026

A summary of dividends paid for the three months ended March 31, 2026 and 2025 is as follows:


	Three Months Ended March 31,
	2026		2025

	(in thousands, except per share amounts)
Regular monthly dividends per share	$	0.78	$	0.75
Supplemental dividends per share	0.30		0.30
Total dividends per share	$	1.08	$	1.05

Total regular monthly dividends	$	70,383	$	66,508
Total supplemental dividends	27,731		26,639
Total dividends	$	98,114	$	93,147

Schedule of Taxable Income and to Total Distributions Declared to Common Stock Reconciliation

A reconciliation of “Net increase in net assets resulting from operations” to taxable income and to total distributions declared to common stockholders for the three months ended March 31, 2026 and 2025 is as follows:


	Three Months Ended March 31,
	2026		2025

	(estimated, in thousands)
Net increase in net assets resulting from operations	$	48,981	$	116,082
Book-tax difference from share-based compensation expense	5,105		4,842
Net unrealized (appreciation) depreciation	50,599		(63,190)
Income tax provision	6,236		7,373
Pre-tax book income not consolidated for tax purposes	(28,080)		(14,078)
Book income and tax income differences, including debt origination, structuring fees, dividends, realized gains and changes in estimates	5,624		47,082
Estimated taxable income (1)	88,465		98,111
Taxable income earned in prior year and carried forward for distribution in current year	80,058		120,488
Taxable income earned prior to period end and carried forward for distribution next period	(93,767)		(147,552)
Dividend payable as of period end and paid in the following period	24,126		22,165
Total distributions accrued or paid to common stockholders	$	98,882	$	93,212

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(1)MSCC’s taxable income for each period is an estimate and will not be finally determined until MSCC files its tax return for each year. Therefore, the final taxable income, and the taxable income earned in each period and carried forward for distribution in the following period, may be different than this estimate.

Schedule of Net Investment Income Related Taxes

Main Street’s provision for income taxes was comprised of the following for the three months ended March 31, 2026 and 2025:


	Three Months Ended March 31,
	2026		2025

	(in thousands)
Net investment income taxes
Current tax expense:
Federal	$	—	$	164
State and other	455		660
Excise	381		1,341
Total current tax expense	836		2,165

Deferred tax expense (benefit):
Federal	3,627		1,894
State and other	(1,199)		(146)
Total deferred tax expense	2,428		1,748

Total net investment income tax provision	$	3,264	$	3,913

Investment valuation related taxes
Current tax expense:
Federal	$	1,443	$	321


Total current tax expense	1,443		321

Deferred tax expense (benefit):
Federal	1,103		3,271
State and other	426		(132)
Total deferred tax expense	1,529		3,139

Total investment valuation related income tax provision	$	2,972	$	3,460

Total income tax provision	$	6,236	$	7,373