Your LinkedIn targeting isn't the whole audience. Two settings LinkedIn turns on for you widen it: Audience Expansion shows the ad to members similar to the ones you chose, and the LinkedIn Audience Network shows it on third-party sites beyond the LinkedIn feed. And when you target an uploaded list, you reach the part LinkedIn could match, not the file.
None of this is hidden. But the audience estimate you see while building an ad set leaves expansion out, so it's easy to lose track of who actually saw the ad.
A campaign that targeted a whole country
On a mentoring call, the head of growth at an AI hiring startup opened a LinkedIn video campaign that a contractor had set up. The targeting had one location, the United States, and nothing else: no job titles, no industries. Audience Expansion was on, and about $350 had gone through it. Our word for it on the call was a blender: anyone on LinkedIn in the US, plus whoever expansion added.
The fix was to define the buyer first. Job titles such as CEO, CTO and VP or Director of HR, and industries that match the candidates on the platform. Our stance is simple: every platform will distribute ads automatically if you let it, so never rely on that. Build the audience you want, then decide which of LinkedIn's widening tools to keep.
Two switches, two different jobs
- Audience Expansion: who. LinkedIn shows the ad to members with attributes similar to your target audience, such as a related skill to the one you targeted. It's enabled automatically on ad sets where it's available, and you clear Enable Audience Expansion in the Audience section to stop it. Exclusions still hold. The forecast doesn't count expansion members, but your reports do, so impressions can land on seniorities you never picked.
- LinkedIn Audience Network: where. It delivers your Sponsored Content to LinkedIn's professional audiences on third-party sites beyond the feed. It's automatically enabled for new single image, carousel, document and video ad sets, and you clear it in the Placements section.
We usually turn Audience Expansion off whenever a tight ICP is the point, and decide on the Audience Network campaign by campaign. For a broad awareness video, both can stay on. For account-based and list campaigns, we want the ad to stay with the people we chose.
With a list, count the match, not the file
When you upload a contact or company list, LinkedIn matches it to member accounts or Pages. Match rate is the share of your entries that matched in the past seven days. Last audience count is the number of reachable members after duplicates and opted-out members are removed. LinkedIn's example: 2,000 entries, 1,400 matches, and 200 duplicates leave an audience of 1,200.
Contact lists match only members with a verified email address, and Matched Audiences can be smaller in the EEA and Switzerland, where LinkedIn matches only members who opted in. A list that matched fewer than 300 members shows a match rate under 5%, and an ad set needs at least 300 members to run. For list setup, see warm the list with a LinkedIn ad before the first cold email.
Check who you actually reached
- Define the audience first. Location alone is not targeting. On the call we suggested keeping a defined cold audience above 100,000. LinkedIn suggests at least 50,000 to drive results, and at least 300,000 for Sponsored Content and Sponsored Messaging.
- Read professional demographics, not the forecast. Reports combine your target and expansion audiences, so they show who really saw the ad.
- Check placements on every new ad set. The Audience Network is ticked by default for the main Sponsored Content formats.
- Exclude what must never see it. LinkedIn leaves excluded attributes out of expansion, so exclusions are the guardrail if you keep it on.
The takeaways
- Audience Expansion widens who sees the ad. The Audience Network widens where. LinkedIn turns both on where they're available.
- The forecasted audience size leaves expansion out. Your reports include it.
- Location alone is not targeting. Add job titles and industries before anything else.
- For lists, match rate and last audience count show who's reachable. Under 300 matched members won't run.
- Turn expansion off when a tight ICP is the point.
Common questions
What is the difference between LinkedIn Audience Expansion and the Audience Network?
Audience Expansion changes who sees the ad: LinkedIn adds members with attributes similar to your target audience. The LinkedIn Audience Network changes where the ad appears: it delivers Sponsored Content to LinkedIn's professional audiences on third-party sites beyond the LinkedIn feed. They are separate checkboxes, in the Audience and Placements sections of the ad set.
Is LinkedIn Audience Network on by default?
Yes for new single image, carousel, document and video ad sets, where LinkedIn enables it automatically. You can clear the LinkedIn Audience Network checkbox in the Placements section when you create or edit the ad set.
Does the LinkedIn audience size estimate include Audience Expansion?
No. LinkedIn says the estimated target audience size in the Forecasted Results panel won't include member accounts from audience expansion, and neither will a saved audience's count. Performance and professional demographic reports do include them, combined with your target audience.
What does LinkedIn match rate mean?
Match rate is the percentage of entries in your uploaded list that matched member accounts or Pages within the past seven days. Last audience count is the number of reachable member accounts or Pages after duplicates and opted-out members are removed, so it can be lower than the match rate suggests.
Why does my LinkedIn match rate show less than 5%?
LinkedIn shows the match rate as under 5% when a list matched fewer than 300 member accounts. Contact lists only match members with verified email addresses, which lowers match rates. Check the file's format and headers, and remember an ad set needs at least 300 members to run.