Yeah, funds, or anyone who makes investments essentially. Unlike banks, which focus on the sale and generating revenue from fees etc. rather than investment insight. Investopedia isn't always the best source, but for definitions they come in handy: https://www.investopedia.com/terms/b/buyside.asp
(I had a brief internship in finance on the buy-side and had to look up a ton of terms like that, to the degree that I was given this tongue-in-cheek "guide": https://www.amazon.com/Damn-Feels-Good-Be-Banker/dp/14013096.... It's immature af, but managed to teach me the cliches and terminology.)