The Grand Ayatollah Khamenei answered a question about one person performing Hajj on behalf of a few individuals.
Question: Can I perform Hajj once on behalf of few different individuals, and of course they cover the usual expenses?
The Grand Ayatollah Khamenei: Performing Wajib Hajj on behalf of few individuals in one year is not correct; and there is no problem in non-Wajib (Hajj).
Source: Khamenei.ir