The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows (in millions):


	March 31, 2025						September 30, 2024
	Gross Amount		Accumulated Amortization		Net Amount		Gross Amount		Accumulated Amortization		Net Amount
Intangible assets subject to amortization
Trade/domain names and other licenses	$	7.7	$	(3.8)	$	3.9	$	4.1	$	(3.2)	$	0.9
Software programs/platforms	2.4		(1.8)		0.6		4.9		(4.1)		0.8
Client and supplier base	25.3		(13.4)		11.9		37.7		(25.6)		12.1
Total intangible assets subject to amortization	35.4		(19.0)		16.4		46.7		(32.9)		13.8

Intangible assets not subject to amortization
Website domains	2.1		—		2.1		2.1		—		2.1
Business licenses	3.7		—		3.7		3.7		—		3.7
Total intangible assets not subject to amortization	5.8		—		5.8		5.8		—		5.8
Total intangible assets	$	41.2	$	(19.0)	$	22.2	$	52.5	$	(32.9)	$	19.6

Amortization expense related to intangible assets was $1.2 million and $2.1 million for the three months ended March 31, 2025 and 2024, respectively. Amortization expense related to intangible assets was $2.3 million and $4.1 million for the six months ended March 31, 2025 and 2024, respectively.


(in millions)
Fiscal 2025 (remaining months)	$	2.4
Fiscal 2026	4.1
Fiscal 2027	3.4
Fiscal 2028	2.3
Fiscal 2029 and thereafter	4.2
Total intangible assets subject to amortization	$	16.4