Magnite is the largest independent sell side advertising platform trusted by top publishers and brands worldwide. Specializing in CTV and online advertising, Magnite helps clients monetize content efficiently. Magnite's User Choice Portal has an on-page opt-out toggle for targeted advertising, but it is cookie-based, so you must repeat it on every browser and device and again any time you clear cookies (enabling Global Privacy Control also signals your choice). For access, correction, or deletion you must first find your Digital Identifier (specific cookie values like 'khaos' or 'tvid', or your mobile Advertising ID) and email it to privacy@magnite.com; phone help is available at +1.888.812.3839.