Microsoft Ads now takes 10,000-company lists. What can a company list actually do in a Search campaign?

KEY TAKEAWAYS

1. In Search a company list changes bids for matched people. It never narrows who can see the ad.
2. Under automated bidding the list adjustment is a hint. Lead values carry more weight than a multiplier.
3. Measure matched clicks at a 0% adjustment before setting any number, and bid to the low end of the range.
4. Searchers in the EEA, the UK and Switzerland are outside the data, whatever companies the list contains.

On 30 September 2026 Microsoft Advertising raised the size of a LinkedIn company list from 1,000 names to 10,000. Its own example is a B2B seller with 8,000 target accounts putting all of them in one list. That sounds like account-based marketing on search. It is narrower than that. Before you upload anything, settle what a list can do in a Search campaign, how much traffic it will touch, and which lever actually moves your bids.

What changed on 30 September?

Three things, all in Microsoft's monthly product post. Lists now hold up to 10,000 company names. You can build them during campaign setup or in the audience library, and use them with LinkedIn profile targeting in Search and Audience campaigns. And Microsoft states two limits: company names display mostly in English, and the underlying consumer data excludes users in the EEA, the UK and Switzerland.

Two other changes sit around it. Job seniority, with ten levels from CXO to Volunteer, became generally available for Search and Audience campaigns in Microsoft's August update. And PPC News Feed reported on 26 September that Company List and Job seniority now appear in the Audience planner, so you can forecast reach before you buy. That forecast applies to Audience campaigns, not Search.

The feature itself is old. Search Engine Land covered the US launch on Bing in 2018, when Microsoft said it was starting with "bid-only targeting, with exclusions coming soon." What is new is scale. PPC Land notes that as late as 10 June 2026, a Microsoft answer said company lists could not be imported and companies had to be found by name.

Does a company list narrow who sees your search ads?

No. This is the point most guides get wrong or skip. Microsoft's help page describes LinkedIn profile targeting as bid only. Targeting a company does not exclude people who work elsewhere. Microsoft's API reference agrees: profile criteria are biddable in Search, Dynamic Search Ads and Shopping, and negative profile criteria are supported only in Audience campaigns.

A 2021 JumpFly guide says Search can use a target-and-bid setting. Microsoft's current documentation says otherwise, and so did Susan Wenograd's 2020 write-up for Search Engine Journal. We go with Microsoft's documentation.

So in Search, a list does one job. It marks the searchers Microsoft can match to those companies and applies your bid adjustment to them. Everyone else still sees your ads at the base bid.

There is a second trap. PPC Land's report on Microsoft's October newsletter says company lists combine with other LinkedIn criteria, such as industry and job function, as OR, and with device, location and content as AND. WebMechanix noted the same OR behaviour years earlier. If you add a company list and an industry to the same ad group expecting the overlap, you get the union instead.

Does the bid adjustment still work under automated bidding?

Only as a hint. Microsoft's BidMultiplier reference sets most adjustments between -90% and +900%, then says that with Maximize Clicks, Maximize Conversions, Target CPA or Target ROAS, the multiplier informs the automated bid but does not directly change or override it.

That matters more since 1 October. Microsoft removed Max CPC from new non-portfolio campaigns that use Maximize Conversions, Maximize Conversion Value or Maximize Clicks. Search Engine Journal reports that existing campaigns keep it, and that portfolio strategies, Target Impression Share and Enhanced CPC are unaffected. Microsoft's suggested controls instead are budgets, targets, conversion value rules and seasonality adjustments.

Guides that tell you to add +35% or +50% for target accounts are describing manual bidding. In a new automated campaign that number is a suggestion. The stronger signal is the value of the conversions you send back.

Two value levers exist. Conversion value rules accept audience, location and device conditions. Microsoft's help page does not say whether a company list counts as an audience for this purpose, and notes that not every account has the feature yet. Check your own account before you plan around it. The other lever is lead quality data. PPC Land reports that the new HubSpot integration can send lifecycle stages such as MQL and SQL to Microsoft for bidding, with no backfill. If target-account leads reach SQL more often, that stage carries the difference into the bid without any multiplier. Our piece on which CRM stage to send back covers how to pick the stage.

How much traffic will a 10,000-company list touch?

Less than the list size suggests. The adjustment only reaches people Microsoft can tie to a LinkedIn profile at a listed company, and only when they search your keywords. Microsoft publishes no match rate for search.

The one public test we found is old but sobering. PPC Hero ran company targeting for two months in 2020 with more than 3,000 companies. It produced fewer than 50 impressions and no clicks. Metric Theory reported better CPA, conversion rate and ROAS for industry audiences than account averages in 2019, but published the figures only as images. Neither is a controlled test. Both suggest that broad segments collect data far faster than named companies.

For comparison, LinkedIn's own company list targeting needs at least 300 matched members before a campaign can serve, and recommends at least 1,000 companies. Microsoft states no minimum for search. That is not good news. It means a list can sit in a campaign, apply to almost nobody, and give no warning.

Geography cuts further. If your buyers search from Germany, France or the UK, the list does nothing for them under the data limit Microsoft set out in September. In 2020, MarTech listed the UK, France and Germany among the launch markets. Check where your clicks come from before you build the list.

What about the 64% conversion lift?

Agency pages and HubSpot's Microsoft page repeat that LinkedIn profile targeting lifts conversion rates by about 64%. We traced it. GrowthSpree cites Ignite Visibility. Ignite's February 2026 post cites an image captioned as stats from a Microsoft webinar, with no date or sample. HubSpot gives no source. Microsoft's own audience targeting page cites a different figure: a 50% higher conversion rate for any audience targeting, from internal search data in September 2022, comparing campaigns with and without audiences. That is not about LinkedIn data or company lists.

So no published, controlled number exists for this feature. Your own matched traffic is the only evidence worth bidding on.

How do you set the adjustment from your own data?

Treat the list as an observation layer first, then bid to the low end of what the data supports.

A hypothetical example, with invented numbers. A US software firm runs a Search campaign on Enhanced CPC. It adds a list of its 900 top accounts at 0% for four weeks. The campaign gets 6,000 clicks, of which 300 match the list. The CRM shows 6 SQLs from matched clicks and 34 from the other 5,700.

The matched rate is 0.020 SQLs per click. The unmatched rate is about 0.006. The ratio is about 3.3, which would imply roughly +230%. But 6 is a small count. An exact Poisson 95% interval for 6 events runs from about 2.2 to 13.1 (our calculation). At the low end, the matched rate is 0.0073 per click, and the ratio drops to about 1.2. A defensible first setting is +20%, not +230%. Revisit after the next four weeks add more SQLs.

The rule is general. Divide the low end of the matched rate by the unmatched rate, subtract one, and use that as the adjustment. With very few matched outcomes, the low end will sit at or below the unmatched rate. That tells you to stay at 0% and keep collecting.

Which lever fits which campaign?

The last row reflects an open conflict. Microsoft's post and Search Engine Land describe 10,000-name lists. Microsoft's help page, its API reference and PPC News Feed still give 1,000 companies per ad group or campaign. Until Microsoft reconciles them, confirm in your account that a full list attaches where you expect.

A seven-step setup

1. Check geography. Pull the share of clicks from the EEA, the UK and Switzerland. If it is most of your traffic, stop here.
2. Build the list from CRM accounts. Use the legal names LinkedIn shows, since names display mostly in English. Allow one to two days for processing, per PPC Land.
3. Split it by tier. Keep your top accounts separate from the long tail, so each tier can earn its own adjustment.
4. Attach at 0%. Run four weeks as observation. Read the Professional demographics report, which Microsoft keeps at daily level for 36 months.
5. Join clicks to CRM outcomes. Count SQLs or opportunities, not form fills, for matched and unmatched traffic.
6. Set the adjustment, or the value. On manual or Enhanced CPC, use the low-end rule. On automated bidding, send lifecycle stages so the value difference reaches the bid.
7. Test the change. Microsoft's optimization experiments became generally available for Search in September. Run the adjustment as a treatment against the original, and judge it on the same CRM stage. Our note on what a 65% confidence winner is worth explains why a small gap needs more conversions than most B2B accounts get in a month.

A company list is a cheap way to see whether your target accounts search for what you sell. It is a weak way to force spend toward them. Accounts that already know a brand often find it outside paid search too. If you want to see how your brand shows up in AI answers, the waitlist is open.

Questions

Can a company list restrict a Microsoft Search campaign to target accounts only?

No. Microsoft documents LinkedIn profile targeting in Search, Dynamic Search Ads and Shopping as bid only. Targeting a company raises or lowers bids for its employees but does not stop others from seeing the ad. Exclusions by company, industry or job function are only supported in Audience campaigns.

Do company list bid adjustments work with Target CPA or Maximize Conversions?

Only as a hint. Microsoft's API documentation says that with Maximize Clicks, Maximize Conversions, Target CPA and Target ROAS the multiplier informs the automated bid rather than modifying it. To change what the system pays for target accounts, send it better conversion values, such as CRM lifecycle stages.

Do company lists work for searchers in Europe or the UK?

Microsoft says the underlying consumer data for company lists excludes users in the EEA, the UK and Switzerland. A list can include European companies, but searchers in those regions will not be matched, so the bid adjustment will not apply to them.

Is the claim that LinkedIn targeting lifts conversion rate by 64% reliable?

We could not trace it. The agency pages that repeat it cite a Microsoft webinar slide or give no source, sample or date. Microsoft's own audience page cites a different, general figure for any audience targeting. Treat the 64% as unverified and measure your own matched traffic.

Sources

1. Microsoft Advertising Blog, Less busywork, more growth: What's new in Microsoft Advertising this September about.ads.microsoft.com
2. Microsoft Advertising Blog, AI Max for Search and other product news for August 2026 preview-about.ads.microsoft.com
3. Microsoft Advertising Help, LinkedIn profile targeting learn.microsoft.com
4. Microsoft Advertising API, ProfileCriterion Data Object learn.microsoft.com
5. Microsoft Advertising API, BidMultiplier Data Object learn.microsoft.com
6. Microsoft Advertising Help, Conversion value rules learn.microsoft.com
7. Microsoft Advertising API, Reporting Data Retention Time Periods learn.microsoft.com
8. Microsoft Advertising, Audience targeting about.ads.microsoft.com
9. LinkedIn Marketing API, Account Based Targeting with company lists learn.microsoft.com
10. PPC Land, Microsoft Advertising gains LinkedIn company lists of up to 10,000 firms ppc.land
11. PPC News Feed, Microsoft finishes rolling out LinkedIn profile targeting in Audience planner ppcnewsfeed.com
12. Search Engine Land, Microsoft Advertising adds HubSpot integration ahead of holiday season searchengineland.com
13. Search Engine Journal, Microsoft Ads Is Removing Max CPC From New Campaigns searchenginejournal.com
14. Search Engine Land, Marketers can now use LinkedIn category data for targeting through Bing search searchengineland.com
15. Search Engine Journal, LinkedIn targeting for Microsoft advertisers searchenginejournal.com
16. MarTech, Microsoft Advertising expands LinkedIn Profile, dynamic remarketing, in-market audience targeting martech.org
17. PPC Hero, Microsoft Ads LinkedIn Profile Targeting: A Review ppchero.com
18. Metric Theory, LinkedIn targeting for Microsoft Advertising search campaigns metrictheory.com
19. JumpFly, Microsoft Ads LinkedIn Targeting jumpfly.com
20. WebMechanix, The Breakdown: Microsoft Ads Now Offers LinkedIn Profile Targeting webmechanix.com
21. Ignite Visibility, Microsoft Advertising LinkedIn ads ignitevisibility.com
22. GrowthSpree, Microsoft Advertising for B2B SaaS in 2026 growthspreeofficial.com
23. HubSpot, HubSpot and Microsoft Advertising hubspot.com

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