What are the best firms to look for associate PMM roles?

See above.

Gong, of course :) Come join us (https://gong.io/careers)

I mean I'm biased but on top of that, I think Salesforce took the Product Marketing to the next level back in the days, and helps elevate the function in the industry.

At the end of the day, it is all about cutting through the noise and finding your own voice.

I think the companies that excel at PMM actually see Brand, PMM and Corp Narrative as different sides of the same coin. Telling your story. Your brand is your reputation in the market, and PMM naturally helps tell stories that foster that reputation.