Can one buy stocks during the nine days?
What if there was a sharp selloff and one believes that stocks are cheap and it is a good time to buy?
Answer:
Although one should limit the scope of one’s business dealings in the Nine Days, if there is a business opportunity that might not return, or the possibility of a financial loss, it is permitted to take advantage of it.
See Shulchan Aruch 551:2, and Mishnah Berurah 11.
