M+R is a team of communicators, marketers, fundraisers, and campaigners dedicated to supporting nonprofits in various causes such as human rights, democracy, equality, accessibility, and sustainability. They empower nonprofits through fundraising, supp... M+R pools donor data from its nonprofit clients and builds "likelihood to donate" inferences, so opting out matters even if you've never visited their site. The policy points to an opt-out form plus the "Do Not Sell My Personal Information" link in the website footer, but no direct URL is printed in the text — you may need to find those links on mrss.com or email [email protected]. Supply both your name and email address, since they say both are needed to process a client-data opt out; their own CCPA metrics report a mean response time of about 4 days.