By running a 36-page CISO guide as a LinkedIn document ad with a native lead gen form, we generated more than 120 leads at around $25 each, and over 90% of them were genuine CISOs. Here is the build.
Why we tried it
Security is one of the most expensive audiences on LinkedIn. A single click can cost more than a whole lead does in other categories, and sending that click to a landing page means paying the price twice, once for the click and again in the drop-off. We already argue that document ads beat image ads for top-of-funnel guides. The open question was whether the format survives an audience this expensive.
What goes into a document ad that converts
Five decisions do most of the work. The numbers below come from one campaign, but the structure is what we now run by default.
- Write the ad copy in three moves. A persona hook that names who this is for and the fear they already carry, then a short sell for the document itself, then a one-line CTA. Ours opened with "Security leaders, agents are already acting inside the systems you're accountable for" and closed with "Download your copy now".
- Preview four pages, no more. Cover, a short why-we-wrote-this, the contents table, and one page of real substance. Six pages changes nothing. Showing the cover alone performs worst of all.
- Build four covers with genuinely different angles. The cover is the ad, so this is the variable worth the most of your testing time. Ours are below.
- Convert in a LinkedIn lead gen form, never a landing page. The form pre-fills from the member's profile, so converting costs two taps. Set it to require work emails.
- Write the form like a second ad. Make the headline the CTA, "Download the guide", and use the description to sell what is inside, chapter by chapter if you have the room. Most teams leave that field on its default and lose people who were one tap from converting.
Same 36-page guide, four different reasons to stop scrolling.
Our standing rule from a year of these campaigns is that dark backgrounds beat light ones almost everywhere, and the dark provocation cover is easily the most striking of the four. It lost. The winner is light, busy and explains the mechanism, which suggests that for a senior technical reader the useful cover beats the good-looking one. A single test does not overturn a rule, so we are running it again.
How to target a LinkedIn document ad
Target by job title, in core geographies only, with audience expansion and the Audience Network switched off. Every number above depends on who saw the ad, and on an audience this expensive a loose build burns the budget before the creative gets a chance.
- Job titles, not job functions. Functions sweep in the intern and the CTO alike. Titles cost more per click and far less per qualified lead.
- Relevant member skills as a second layer, catching the people whose job title is non-standard but whose profile is not.
- Core geographies only. Leaving locations broad quietly funds impressions in markets you do not sell into.
- Company growth rate positive. Companies that are hiring have budget, and it is one of the few LinkedIn firmographics that tracks with buying.
- Audience expansion off, Audience Network off. Both hand your budget to LinkedIn's idea of a lookalike.
- Manual CPC, capped below the recommended bid. The recommendation is built to spend. Start under it and let delivery tell you whether to move.
What changed
- More than 120 leads at roughly $25 each, with over 90% matching the target job title.
- 1% click-through rate, against the 0.5% we average on document ads across accounts. A high cost per click stopped mattering once the click rate doubled.
- Form completion cleared 80%, against the 20% to 30% we normally see on this format. Four in five of the people who opened the form finished it, which is what a pre-filled native form buys you.
- Those leads did more than sit in a list. They filled the retargeting layer quickly, gave sales a live intent signal to work from, and handed marketing a warm audience to nurture into webinar signups and the next asset.
Why it works
- A prospect judges the asset inside the feed before converting, which means the preview is quietly doing the landing page's job and doing it without costing you a click.
- The arithmetic survives an expensive click. Double the click rate, convert four in five of the people who open the form, and even a punishing cost per click lands a cheap lead.
- The cover carries the whole ad, because it is the first and often the only thing a scrolling CISO evaluates. Four beat one good one, and the one you would pick on looks alone is not reliably the winner.
