There is a stock in 4 digits as of now, they bought upper hundreds for several years.If the HQ-9B has an Active Radar Seeker, logically it has to be able to receive mid-course guidance.
It's interesting to note that swarms of LRASMs don't currently exist.
LRASM has only recently been introduced, so only about 100 exist today.
And the plan is to only buy 48 LRASMs per year, until hypersonic missiles are ready.
Current small-batch purchases are basically a sustainer.