A BDC is technically a Regulated Investment Company (RIC), which is a closed end investment fund (meaning investors can't withdraw money from the fund like they can a mutual fund)
BDCs come in many different varieties, including which industries they specialize in, as well as what types of loans they make. For example, Hercules Technology Growth Capital (HTGC) specializes in technology companies, while PennantPark Floating Rate Capital (PFLT) deals exclusively in floating rate loans, which rise when interest rates do.

• Apollo Investment Corp. ( ticker: AINV) ..9.9%.
• Ares Capital Corp. ( ARCC) .8.5%..
• BlackRock Capital Investment Corp (BKCC) ..11%.
• FS KKR Capital Corp. (FSK) 12.1% ...
• Gladstone Investment Corp. ( GAIN) 6.2%...
• Golub Capital BDC (GBDC) ..7.2%.
• Hercules Capital (HTGC) ..0.1%.
• Prospect Capital Corp. (PSEC) 11.2%
• PennantPark Investment Corp. (PNNT) 11%