Share of voice is the percentage of paid placements or impressions a brand captures within a defined competitive set, such as a keyword group, an ad surface, or a tracked panel of prompts.
Share of voice is the percentage of paid placements or impressions a brand captures within a defined competitive set, such as a keyword group, an ad surface, or a fixed panel of tracked prompts.
Aftermarket trackers like SE Ranking's ChatGPT Ads Tracker report share of voice by running a panel of prompts and recording which advertisers show up in the Sponsored block. That number is only as good as the panel behind it: change the prompt list, the sample size, or the geography, and the share-of-voice figure moves with it.
On platforms with a public ad library, Meta for example, share of voice can be checked against a searchable record. On ChatGPT there is no such record, so every share-of-voice number is really a statement about one tracker's methodology, not a market fact.
Share of voice tells you how much of the competitive conversation your brand is winning, which matters more than a raw impression count once you have more than one competitor bidding on the same territory. On platforms with public ad transparency records, a share-of-voice number can be checked and reproduced by anyone. On ChatGPT, where no such record exists, the number depends entirely on the tracker's panel, and two trackers measuring the same market can disagree by tens of points. Treat a share-of-voice figure as a description of one instrument's output, not as the market rate, until the panel behind it is disclosed.
