The carrying amount of goodwill attributable to each reportable segment and the changes in those balances during the nine months ended June 30, 2026 are as follows:


	Reinforcement Materials		Performance Chemicals		Total
	(In millions)
Balance at September 30, 2025	$	50	$	84	$	134
Foreign currency impact		2		1	$	3
Balance at June 30, 2026	$	52	$	85	$	137

The following table provides information regarding the Company’s intangible assets:


	June 30, 2026							September 30, 2025
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives
Developed technologies	$	42	$	(16	)	$	26	$	41	$	(14	)	$	27
Trademarks		2		(1	)		1		2		(1	)		1
Customer relationships		65		(40	)		25		63		(36	)		27
Total intangible assets(1)	$	109	$	(57	)	$	52	$	106	$	(51	)	$	55

(1)

Total intangible assets as of June 30, 2026 includes $2 million of intangible assets from the acquisition of MXCB.

Intangible assets are amortized over their estimated useful lives, which range between ten and twenty-five years, with a weighted average amortization period of approximately sixteen years. Amortization expense was $2 million for both the three months ended June 30, 2026 and 2025. Amortization expense was $5 million for both the nine months ended June 30, 2026 and 2025. Amortization expense is included in Cost of sales, Selling and administrative expenses and Research and technical expenses in the Consolidated Statements of Operations. Total amortization expense is estimated to be approximately $7 million each year for the next five fiscal years.