There is a also a tweet thread by the PolyMarket CEO.

archived

With ~$2 Trillion in yearly volume, SIG is one of the largest market makers on the planet. They now have a dedicated trading division to trade prediction markets on Kalshi. This is the first time in prediction markets history that a prestigious Wall St institution commits to the asset class.

The launch of SIG has the potential to transform prediction markets by making them similar to traditional markets — liquid and dynamic. You can now trade significant volumes, 100,000 shares at a time (up from 1,000) in Kalshi’s major markets.