Matt’s Bakery Cookies that bear a plain O/K symbol are Pas Yisroel. Those, however, that bear O/KD (dairy are NOT Pas Yisroel.
From The O/U: Nature Nate’s
Effective immediately, Nature Nate’s has been terminated by O/U supervision, due to Kashrus violations. All products, even when bearing the O/U symbol are not certified.