You'll want to read thisFrom the 2023 Annual Information Form:
Concentration Risk
To date, a small number of customers have accounted for a majority of PyroGenesis’ revenues. As its business expands, the Company expects that revenue distribution will be over a larger number of different customers. For the year ended December 31, 2023, sales of PyroGenesis to its two principal customers accounted for approximately 44% of its total revenue.