Consolidated Statements of Assets, Liabilities and Members' Capital (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024		Dec. 31, 2023
Statement of Financial Position [Abstract]
Investments, cost	$ 1,231,736	[1]	$ 569,247	[2]
Deferred financing costs, accumulated amortization	$ 1,000		$ 413
Common units, units issued (in shares)	66,479,611		26,941,956
Common units, units outstanding (in shares)	66,479,611		26,941,956

[1] New Mountain Guardian IV BDC, L.L.C. (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.

[2] New Mountain Guardian IV BDC, L.L.C. (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.