Loss Per Share

12 Months Ended

Sep. 30, 2025

Loss Per Share [Abstract]

LOSS PER SHARE

13. Loss per share

Basic loss per share and diluted loss per share have been calculated in accordance with ASC 260 for the year ended September 30, 2023, 2024 and 2025 as follows:

										(Successor)			(Predecessor)
	For the year ended September 30, 2025						For the year ended September 30, 2024			From October 12, 2022 to September 30, 2023			From October 1, 2022 to October 11, 2022
	HK$			US$			HK$			HK$			HK$
Numerator:
Net loss attributable to ordinary shareholders of Alpha Technology Group Limited		(70,409,731	)		(9,049,044	)		(5,487,765	)		(6,830,973	)		(156,387	)
Denominator:
Weighted average number of ordinary shares
— Basic		16,462,500			16,462,500			15,262,500			13,250,000			20,000
— Diluted		16,432,830			16,432,830			14,933,987			1,169,808			—
Net loss per share attributable to ordinary shareholders
— Basic		(4	)		*			—			(1	)		(8	)
— Diluted		(4	)		*			—			(6	)		—

* The balance represents an amount less than US$1.