Nite didn't sell today. Someone may have used them to execute a trade, but Nite itself most likely didn't sell from its own inventory.
MM's are there to offer a market in a stock which they make a position in. Most only hold enough stock to offer an efficient market.
Nowadays, brokerage firms limit the amount of company capital it is willing to risk making markets. Traders on the desk are not expected nor rewarded making money on risk capital. It's all about fees (both principle or agency) trades.
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