From 2022 on BTNX rapid tests:
"BTNX which is headquartered in Markham, but does its manufacturing in China, has supplied nearly 40 million rapid antigen tests to the federal government as of Dec. 31 [2021]
The low-profile company has been run for decades by Iqbal Sunderani, who has a degree in civil engineering from University of Manchester. BTNX’s “production process is split between China & Canada, with quality assurance and labelling completed in #Canada.”