X0609 4 2026-06-15 0001396440 Main Street Capital CORP MAIN 0001069725 FOSTER VINCENT D false 1300 POST OAK BLVD 8TH FLOOR HOUSTON TX 77056 true false false false 0 Common Stock 2026-06-15 5 J 0 14.1986 52.02 A 1672871.4262 D Common Stock 2026-06-15 5 J 0 1160.9600 52.02 A 1674032.3862 D Common Stock 2026-06-29 5 J 0 16.7908 51.01 A 1674049.1770 D Common Stock 2026-06-29 5 J 0 1372.9200 51.01 A 1675422.0970 D Common Stock 2026-07-15 5 J 0 14.3347 53.09 A 1675436.4317 D Common Stock 2026-07-15 5 J 0 1172.0816 53.09 A 1676608.5132 D Common Stock 2026-06-15 5 J 0 88.7159 52.02 A 70896.1901 I MS Trust I Common Stock 2026-06-29 5 J 0 104.9130 51.01 A 71001.1031 I MS Trust I Common Stock 2026-07-15 5 J 0 89.5660 53.09 A 71090.6691 I MS Trust I Common Stock 2026-06-15 5 J 0 172.7186 52.02 A 34729.7186 I MS Trust II Common Stock 2026-06-29 5 J 0 203.2366 51.01 A 34932.9552 I MS Trust II Common Stock 2026-07-15 5 J 0 173.5056 53.09 A 35106.4617 I MS Trust II Common Stock 2026-06-15 5 J 0 88.7159 52.02 A 70145.7159 I MS Trust III Common Stock 2026-06-29 5 J 0 104.9130 51.01 A 70250.6289 I MS Trust III Common Stock 2026-07-15 5 J 0 89.5660 53.09 A 70340.1949 I MS Trust III Common Stock 33300 I MS Trust V The reporting person acquired these shares under a dividend reinvestment plan, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11. Family trust /s/ Jason B. Beauvais, Attorney-in-Fact 2026-08-14