Annual Fund Operating Expenses	Oct. 03, 2025
F/m Compoundr High Yield Bond ETF
Prospectus [Line Items]
Fee Waiver or Reimbursement over Assets, Date of Termination	December 31, 2026
F/m Compoundr High Yield Bond ETF | F/m Compoundr High Yield Bond ETF Shares
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.49%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.00%
Acquired Fund Fees and Expenses	0.10%	[1]
Expenses (as a percentage of Assets)	0.59%
Fee Waiver or Reimbursement	(0.24%)	[2]
Net Expenses (as a percentage of Assets)	0.35%
F/m Compoundr U.S. Aggregate Bond ETF
Prospectus [Line Items]
Fee Waiver or Reimbursement over Assets, Date of Termination	December 31, 2026
F/m Compoundr U.S. Aggregate Bond ETF | F/m Compoundr U.S. Aggregate Bond ETF Shares
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.39%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.00%
Acquired Fund Fees and Expenses	0.06%	[3]
Expenses (as a percentage of Assets)	0.45%
Fee Waiver or Reimbursement	(0.14%)	[4]
Net Expenses (as a percentage of Assets)	0.31%

[1] “Acquired Fund Fees and Expenses” (“AFFE”) are indirect fees and expenses that the Fund incurs from investing in the shares of other investment companies. Total Annual Fund Operating Expenses do not correlate to the expense ratio in the Fund’s Financial Highlights because the Financial Highlights include only the direct operating expenses incurred by the Fund, and exclude AFFE.

[2] F/m Investments LLC (the “Adviser”) has contractually agreed to waive and/or reimburse certain fees and expenses so that the total annual fund operating expenses (excluding AFFE, brokerage commissions, extraordinary items, interest or taxes) is limited to 0.25% of the Fund’s average daily net assets. This contractual limitation is in effect until December 31, 2026, and may not be terminated prior to that date without the approval of the Board of Directors of The RBB Fund, Inc.

[3] “Acquired Fund Fees and Expenses” (“AFFE”) are indirect fees and expenses that the Fund incurs from investing in the shares of other investment companies. Total Annual Fund Operating Expenses do not correlate to the expense ratio in the Fund’s Financial Highlights because the Financial Highlights include only the direct operating expenses incurred by the Fund, and exclude AFFE.

[4] F/m Investments LLC (the “Adviser”) has contractually agreed to waive and/or reimburse certain fees and expenses so that the total annual fund operating expenses (excluding AFFE, brokerage commissions, extraordinary items, interest or taxes) is limited to 0.25% of the Fund’s average daily net assets. This contractual limitation is in effect until December 31, 2026, and may not be terminated prior to that date without the approval of the Board of Directors of The RBB Fund, Inc.