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LinkedIn ads for industrial B2B: when the spend is justified

September 2026 · Advertising · Quebec

LinkedIn advertising earns its cost for an industrial SME when your market holds more buyers than your reps can visit, and when LinkedIn can actually assemble an audience of at least 300 accounts out of them. That threshold is not an agency opinion. LinkedIn states it plainly: "The minimum audience size required to run an ad set is 300 member accounts." It is the first question to settle, before the budget, before the creative, before you pick a supplier. If your real targeting does not reach 300 member accounts, nothing runs.

This page will not show you how to build a campaign. It gives you what you need in order to judge one: what LinkedIn documents, what it refuses to publish, and what should appear in a serious quote. Every figure quoted comes from an official LinkedIn page, with the link and the fetch date at the bottom.

Targeting is the real asset, and it has a floor

On LinkedIn you are not buying attention, you are buying a filter. The platform documents its targeting categories by name: company (industry, company name, size, revenue, growth), job experience (job title, job function, seniority, skills, years of experience), education, demographics, interests and traits, location, which is mandatory, and devices. Company size is targeted through documented bands: 1, 2 to 10, 11 to 50, 51 to 200, 201 to 500, 501 to 1000, and up from there.

For a metal fabricator in the Beauce or a controls integrator serving plants along the St. Lawrence, that has a concrete meaning. You can put your ad in front of maintenance managers at 201 to 500 employee plants in your industry, without paying to reach the rest of the province. It is a different mechanic from the consumer social platforms, which I cover on the Facebook and Meta advertising agency page.

The filter has written limits, and a competent supplier knows them cold. LinkedIn documents that job functions cannot be AND'ed with included job titles, that seniorities cannot either, and that industries cannot be AND'ed with included employers. In other words, the stacked targeting some quotes describe is sometimes not buildable at all. Demand the estimated audience size before you sign, and demand that someone name the condition that had to be dropped to get there.

LinkedIn also formally acknowledges committee buying: its documentation exposes a targeting facet called buyerGroups, for reaching members who belong to specific buyer groups. It does not tell you how many people decide at your customer, and nobody should quote you a number on that. It confirms that the platform is built for a purchase made by several hands, which is the starting point of long-cycle B2B marketing.

What LinkedIn does not publish, and what that tells you about a supplier

LinkedIn publishes no cost per click, no CPM, no cost per lead. Its official page on advertising cost says only that what you are charged depends on your optimization goal and bidding strategy, and that the price is set by an online auction where your campaign competes with campaigns using similar formats and audiences. There is not a single number on that page.

So the agency that tells you to "budget roughly this much per click on LinkedIn" is quoting a third party, not the platform. That is not necessarily dishonest, but it is an average of other advertisers, in other countries and other industries, and it commits nobody to anything. The honest answer to "what does a LinkedIn lead cost" starts with "I do not know yet", and continues with how long it will take to know it for your account.

The same goes for the minimum daily budget that circulates in blog posts. LinkedIn publishes no universal daily minimum. What its documentation exposes instead is a minimum, a maximum and a suggested bid that the platform returns at setup, based on the audience you targeted and the currency of the account. Your budget floor is not copied from an article. It is observed in your account, on your audience.

One last caution about numbers. The volumes LinkedIn shows on its own marketing site, over a billion members and tens of millions of decision makers, are global figures. None of them is a Quebec audience size, and nobody should present them as one.

The budget floor, as it actually exists

Three documented rules are enough to frame your financial commitment, and none of them requires an invented dollar figure.

The governance rule that follows is simple: a LinkedIn budget is discussed over the full length of the mandate, never in dollars per day. A supplier presenting a daily figure to you as a ceiling is either wrong or counting on you not reading the documentation.

The second consequence is harder to hear. If your qualified audience in Quebec sits barely above 300 accounts, the real question is no longer how much to spend, it is how many times the same person will see your ad before getting sick of it. A small audience and a large budget produce saturation, not reach. That is the point where a frequency cap stops being a technical setting and becomes a management decision.

Creative: three formats industrial SMEs leave on the table

LinkedIn names its formats and publishes their specifications. Three are worth your attention, because they match material you already own.

Video ads accept three seconds to 30 minutes, in a file of 75 KB to 500 MB. That is not an invitation to run your six minute corporate film. It is proof that the constraint is not technical but editorial, which means it is yours to make. What to demand from a video supplier is covered in the LinkedIn B2B video piece.

Document ads accept PPT, DOCX and PDF files, up to 100 MB and 300 pages, and everything downloads as a PDF for the reader. For a manufacturer this is the format closest to real sales material: a spec sheet, a specification binder, an installation dossier. You do not have to invent content, you have to choose which piece deserves to sit in front of a buyer.

Carousel ads take 2 to 10 cards. Text ads are capped at 25 characters of headline and 75 characters of description, and that second number is the best positioning test in existence: if your proposition does not fit in 75 characters, it is not clear yet, and no budget fixes that. LinkedIn also lists Thought leader ads, which run a person's post rather than the company page's. When the founder is the known face in the industry, that is the format to ask for by name.

When none of this applies

Two situations where this page should sell you nothing.

The first: your buyers are a dozen named people at four or five customers. You do not have a reach problem, you have a relationship problem. A trip, a plant visit and a phone call beat any campaign. LinkedIn would charge you to reach people whose numbers are already in your phone, and would do it worse than a coffee.

The second: your category barely exists on LinkedIn in Quebec. Some specialised trades simply do not have their buyers on the platform, and the 300-account threshold will tell you that before you spend a dollar. In that case the money goes elsewhere: being findable the day someone searches for your process, with pages that answer the question. An audience forced into existence by widening the targeting until it clears the threshold is no longer your market, it is volume bought to make a report look healthy.

Between those two sits the real zone of application: a market of a few hundred companies you cannot all visit, buyers identifiable by job title and plant size, and something to show that proves you have done the work before. The ad accounts, on Meta, LinkedIn and Google, I run myself, and the same person shoots the content. Nothing is relayed through an account manager.

Sources

If you want to know whether your market clears the 300 accounts before you commit a budget, take 15 minutes.

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