Weapons market manipulation?

Having several corporations producing weapons, I've noticed that there is suddenly a huge shortage of products that have always had a huge surplus. After checking basically every product's supply and demand history, I've noticed this trend with light arti and tank shells, where the supply decreased by almost 95% and the demand increased by 200 and 400% in just over a day. While searching I've also noticed *huge* spikes in surplus of some weapons, as well as a worrying, constantly increasing demand for strategic weapons. Though the last issue could be natural since the demand is increasing slowly over time.

The weapons market is quite thin, meaning the number of transactions is not very large.

This means that it is easier to manipulate, buy a lot, increase prices and then sell.

the way against it is for more players to join and do their own "manipulations" and make the market less predictable.