Is Trader Joe's a private brand?

Excuse me, I was wondering if you could clarify something for me. In the context of retail and branding, I've come across the name "Trader Joe's" and I'm trying to understand if it's a private brand or not. Could you please elaborate on that? I'm particularly interested in understanding the ownership structure and whether or not it's an exclusive brand that's only available through specific retail channels. Thank you in advance for your assistance.