How to Optimize LinkedIn Ads Without Wasting Spend on the Same Few People?

Quick Summary

Most LinkedIn ad campaigns leak 15% to 20% of spend because three ad set settings get picked once at setup and never revisited. If you are working out how to optimize LinkedIn ads at the campaign level, this guide walks through fixing them in the right order (audience, bidding, then ad frequency) and covers ideal frequency ranges for every LinkedIn ad type in 2026, including Thought Leader Ads.

How to Optimize LinkedIn Ads Starts with the Settings

Optimizing LinkedIn ads is less a creative problem than a settings problem. The three levers that decide how much of your budget lands on your target audience live inside the ad set. This guide walks through them in the order we fix them on a live account, then digs into ad frequency by ad type.

Why Listen to Us

Impactable is a LinkedIn Certified Marketing Partner running paid campaigns for 150+ B2B companies at any given time, with monthly ad spends from launch-stage budgets to $500k+. Every number and default in this guide comes straight from the audit checklist we work through on live client accounts. Nothing here is theoretical.

Ad Frequency in Retargeting Campaigns

Ad frequency, the average number of times a prospect sees an ad within a given time period, plays a crucial role in the performance of retargeting campaigns on LinkedIn. If the ad frequency is too high, it can cause ad fatigue among users, reducing the effectiveness of the campaign and lowering conversion rates. However, if the ad frequency is too low, it may not be sufficient to re-engage users and bring them back to the website.

In this article, we will explore the ideal frequency range of the different types of ads available on LinkedIn and how to use them to optimize your retargeting campaigns. Let us get started.

Fix Your Audience Before You Touch Anything Else

If your audience is wrong, a smarter bid just means paying to reach more of the wrong people.

Start with size, because LinkedIn publishes its own numbers. Its audience size guidance recommends a minimum of 300,000 for Sponsored Content and Sponsored Messaging, and between 60,000 and 400,000 for text ads. The technical minimum is 300 members, but at that size the same accounts keep seeing your ads and your CPC climbs along with it.

Then look at the three defaults LinkedIn has already switched on for you.

• ›››Location targeting defaults to recent or permanent location, so it catches anyone who logged in from your city once in the last six months.
• ›››Audience Expansion goes further and shows your ads to people LinkedIn only thinks resemble your list, which waters down the targeting you pay a B2B premium for.
• ›››The LinkedIn Audience Network also pushes your ads onto third-party sites and apps you never picked.

We turn all three off on a new account, then test them back on individually if we are genuinely struggling to spend the budget.

The other thing to sort out is who you keep out. Staffing firms, universities, and your own competitors click B2B ads all day, and across the accounts we audit they eat 15% to 20% of spend. Pull your company demographics report monthly and refresh exclusions each quarter.

Change the Delivery Settings LinkedIn Picked for You

With your audience in good shape, the next lever is how LinkedIn actually spends your budget. That comes down to bidding strategy. Maximum delivery bids automatically and charges you on CPM, so it spends fast without giving you much control. Cost cap lets you set a target cost per key result. Manual bidding lets you name the CPC or CPM yourself.

Maximum delivery is the one to watch, because it is built to spend your whole budget rather than spend it cheaply. On accounts we take over, we have moved ad sets that had stopped delivering over to manual CPC and cut their cost per click roughly in half inside two weeks, without touching the audience or the creative.

In North America, start manual bids near $7 and creep them up until you are spending the whole daily budget. Better creative helps here too: LinkedIn charges you less when your ad is more relevant to the audience seeing it.

Hardly anyone touches the schedule either, and that is the one that trips people up. LinkedIn resets budgets at midnight UTC, so a lot of your spend goes out while your buyers are still asleep.

We A/B tested this on a B2B marketing agency client. By restricting delivery to 5 AM through 6 PM Monday to Thursday, we cut their CPC by 56.1% and their CPM by 47.6% while impressions still rose 66.9%, all inside two weeks.

LinkedIn added a native frequency cap too. You can pick between 3 and 30 impressions per member account per seven days, but the cap only runs on Classic ad sets under the brand awareness objective. Lead gen and website conversion ad sets, which is where most retargeting lives, do not have it. For those, you control frequency yourself. Which brings us to the rest of this guide.

Ad Frequency in Retargeting Campaigns

With retargeting campaigns especially, I like to pay close attention to ad frequency. It is a critical metric that helps us understand how well your campaigns are doing and how to tweak them for better results.

When looking at performance, it is business imperative to look at ad frequency in the context of the entire campaign. For example, suppose you have been running a campaign for 30 days. You do not yet have enough data to draw valuable insights from; however, if the average prospect has seen your ads five times in the last 30 days, it is reasonable to assume that they will see your ads 15 times in the next 90 days.

This information becomes the guiding light for future campaigns so you can ensure that prospects are served the appropriate number of ads. Remember, the number of ads should always match the projected ad frequency; if they do not, people will end up seeing your ads more or less than they ideally should, which can result in ad fatigue and diminishing returns.

It is worth noting that if you only have five ads in a campaign and the 90-day frequency is 20, then each prospect will, on average, see not just those five ads but each of those five ads four times. If your strategy involves showing unique and fresh creatives to your prospects over 90 days, your ad set should have enough creatives to match that frequency.

Optimization Settings for Retargeting Campaigns

By default, ad rotation is set to optimize for performance, which means the campaign will prioritize and allocate more budget to the ads that are performing best. However, for retargeting campaigns, it is often more beneficial to switch to Rotate ads evenly, where all the ads, not just the top-performing ones, are shown evenly to the prospects.

Your optimization settings should align closely with your campaign goal. Say you want to show 15 unique creatives to your prospects over 90 days. If you optimize for performance, the ad set will only serve the top two or three ads multiple times because they drive the most conversions. But your goal is to draw in (and keep) your audience's interest by showing them a variety of ads, so they feel compelled enough to take the next step. Seeing the same ads over and over will accomplish the exact opposite. Therefore, the even distribution setting is a better choice in this case.

It is also worth checking how many ads you have live against what LinkedIn recommends, because the two numbers usually do not line up. LinkedIn suggests running two to four ad variations in an ad set at a time and refreshing them monthly. So the 5 to 10 creatives you want across 90 days were never meant to be live at once. You keep three or four rotating and swap fresh ones in.

In the end, ad fatigue is a real phenomenon that you should be mindful of when running an ad campaign. Even the most effective ads can lose their charm if shown to a prospect 30 times over 90 days. You can delay the inevitable by creating what I like to call “ads-on-demand,” or an evergreen strategy. Keep adding new ads as your average frequency climbs, so there is always something fresh in the queue instead of the same few on repeat.

Ad Frequency by Ad Types

Different ad types have varying levels of ad frequency, and understanding these differences can help you optimize your campaigns for maximum effectiveness.

Single-Image Ads

For most advertisers, single-image ads are a staple. Since they are used often and are more in demand, they have the highest cost per click and the lowest ad frequency.

LinkedIn does not have a specific ad frequency that it recommends or enforces for single-image ads. However, the algorithm adjusts the frequency to reach the desired audience based on audience size, targeting options, budget, and overall campaign goals.

Typically, in a 90-day retargeting campaign, you can expect the average frequency for a single-image ad to be around 5 to 10 impressions per user. To ensure maximum impact, you should have approximately 5 to 10 unique creatives that you can distribute evenly over time. You do not have to unveil all your creatives in the first month. Start small and continue adding more to the queue as time passes. As discussed earlier, optimize the campaign for even distribution.

Video Ads

Similar to single-image ads, video ads are also vying for in-feed competitive placements, and their frequency is generally around 5 to 10 unique impressions per user for a 90-day retargeting campaign. Again, you are looking at 5 to 10 unique creatives to avoid ad fatigue and ensure maximum effectiveness.

Text Ads, Spotlight Ads, and Follower Ads

Known for their high-frequency placements, text ads, spotlight ads, and follower ads appear not in-feed but towards the right of LinkedIn's interface. They are cost-effective and drive more impressions. In my experience, during a 90-day period, their frequency amounts to an average of 15 to 30 impressions per user. This means you can spend less than $50 a month on a text or spotlight ad campaign to get 10,000+ impressions with a frequency of 10 or more. Your name and branding conveniently appear on the user's screen in a non-disruptive manner every time they log in. With single-image and video ads, you would be paying ten times more to achieve a similar outcome.

One thing to know: these are desktop-only placements. Anyone who only opens LinkedIn on their phone never sees one, so we run them alongside your in-feed ads, never instead of them. They are still the cheapest impressions on the platform, but LinkedIn requires $100 of unspent budget in a campaign before you can launch, so plan on a few hundred a month.

Text ads are also an inexpensive way to conduct A/B testing. For example, you can experiment with 20 to 30 versions of the same ads by trying different copy styles and design choices. Based on your findings, you can improve the look and feel of ads and piece the best ones together to present a cohesive campaign narrative.

It can be challenging to attribute conversions to these types of ads, as they are not necessarily meant to convert. They are like little digital billboards for your brand that collectively help improve campaign performance but, individually, might only amount to a little.

Thought Leader Ads

Thought Leader Ads are LinkedIn's newest in-feed format and behave differently from the rest. A Thought Leader Ad promotes an organic post from a personal profile, usually an executive or an employee, sometimes a customer or a 1st- or 2nd-degree connection, with that member's permission. The ad runs under their name and photo, not the company's.

On frequency, expect roughly 5 to 10 impressions per user over a 90-day retargeting window, similar to single-image ads. What is different is the creative pool: a single organic post exhausts itself faster than a rotation of standard sponsored content. If you plan to run Thought Leader Ads at any real scale, build a library of posts to sponsor across multiple people, rather than sponsoring the same one person over and over.

One more thing worth knowing: Thought Leader Ads only run under Brand Awareness, Engagement, or Video Views objectives, and the ad itself has no headline, no call-to-action button, and no advertiser-added URL. So they are a trust and reach play, not a fill-in-the-form play. In practice, we pair a Thought Leader rotation with a low-frequency spotlight or text ad layer for the same audience.

Conversation Ads and Message Ads

Conversation and message ads involve sending direct messages from your LinkedIn Ads account to a prospect's inbox. The upside is that there is a higher chance of your message being read, given that it is delivered directly to an individual's InMail. The downside is that you only have one chance to make a good impression. In contrast, text ads provide more room for testing and learning without burning a hole in your pocket.

Frequency works differently here than for in-feed placements. LinkedIn caps how often a member can receive Sponsored Messaging, so delivery is self-throttled at the platform level. Impression capping is less of a concern on your end. The primary lever becomes message quality.

To ensure that you put your best foot forward, I recommend personalizing the message as much as possible. Suppose a prospect from a particular industry, like marketing, visits your website. You can then write them something like: "I noticed you were checking out our LinkedIn ads page. We let agencies white-label our services, if that is on your radar. Happy to compare notes." Beats anything generic.

Document Ads, Event Ads, and Carousel Ads

Carousel ads are gaining popularity on LinkedIn, and you might catch the algorithm pushing them more than usual. In my experience, the frequency of these formats tends to be lower than single-image and video ads. They might be less popular in comparison to others on this list, but they are great for diversifying your ad campaign and reaching your target audience in a different way.

How to Avoid Diminishing Returns

Say a prospect visits your website and leaves without filling anything in. Seeing your ads 15 to 20 times over the next 30 days is ideal. It is enough to keep your brand at the top of their mind without overwhelming them. If you were to increase the frequency to 75 times, the ad would not become 2.5 times more effective. In fact, it may be even less so, because people start tuning the ad out completely. Overall, it is important to balance how often you want your ads to be seen against the cost of running them. The timing and pacing of these ads should also align with your buyer journey and sales cycle.

For example, if you are an e-commerce company and someone leaves a product in their cart, targeting them with a high ad frequency for the first 30 or 60 days might make sense. However, if your product is enterprise software with a longer sales cycle, you should take a more gradual approach and nurture them over a longer period with a lower frequency.

At Impactable, I have implemented a three-tier system for ad frequency. The first 90 days are focused on a moderate frequency of retargeting ads. If the prospect does not engage with the ads or our business, we adopt a light nurturing approach resulting in low-frequency follower, text, and spotlight ads for the next 180 days. During this time, if the prospect attempts to book a call or clicks through a retargeting ad, we launch a 30-day campaign with a high frequency and a strong call to action. As a result, we are able to adjust the frequency based on the prospect's actions and our sales cycle.

FAQs

What is a good ad frequency on LinkedIn?

For retargeting, 15 to 20 impressions over 30 days is a reasonable target, and 5 to 10 over 90 days is normal for in-feed formats. Right-rail formats (text, spotlight, follower) run much higher, at 15 to 30 over 90 days, because they are cheap and non-disruptive. If frequency is climbing while click-through rate falls, that is fatigue.

Can you set a frequency cap on LinkedIn ads?

Yes, but only on Classic ad sets running the brand awareness objective. You can pick between 3 and 30 impressions per member account per seven days. Lead gen and website conversion ad sets do not have the option, so you control frequency through creatives and audience size instead.

How many ads should I run in one ad set?

LinkedIn recommends two to four variations at a time, refreshed at least monthly. Over a 90-day retargeting window, that is roughly 5 to 10 unique creatives phased in over time rather than launched all at once.

Do text ads and spotlight ads show on mobile?

No. Text ads run on desktop only, and spotlight and follower ads sit in the desktop right rail. To reach people who only check LinkedIn on their phone, use in-feed formats: single-image, video, document, or carousel ads.

What to Fix First

When clients ask us how to optimize LinkedIn ads, they usually expect one lever. It is a stack of small settings that were mostly picked once and never revisited. If you only do three things this week, open your company demographics report and exclude the companies eating your spend.

Check whether your ad sets are still on maximum delivery and try a manual bid on one for two weeks. Then count the ads you have live and compare that number to your 90-day frequency. If there are not enough, people keep seeing the same few.

If those numbers do not match, the same gaps usually show up in your bidding and exclusions too. Our $499 Channel Check runs through the full setting stack on a single channel, one at a time, and ends with a walkthrough of everything we find. It credits to your first month if you decide to work with us afterwards.