B2B advertising is bought against long sales cycles and small audiences, which means almost nothing an agency shows you in a pitch can be verified and almost nothing you buy can be judged for two quarters. That asymmetry is why the published record matters more here than in consumer work: it is the only part of an agency's claim about itself that exists before the relationship starts and can be checked afterwards.
B2B agencies in this index, ranked by what each puts in writing
The pool is this site's record of 134 agencies, of which eleven are headquartered in the United States and evidenced as working in B2B. They are ranked on what each publishes that a buyer can check without a sales call, with the two that publish a price first because a price is the hardest thing to publish and the easiest to hold a supplier to. Every URL below is the page this site read on 18 August 2026. Absence from this list means an agency has not been read, never that it was judged and rejected.
- RevenueZen (Foundation from $3,000/mo): First on the stated basis, because it publishes a named entry tier at three thousand a month and describes on the same page who that tier is for. In a category where almost nobody prices in public, a named floor with a named buyer is the most checkable claim available.
- SimpleTiger ($5,000 to $30,000+/mo): Second, and it publishes a range rather than a floor, which is more honest and more useful: it tells a buyer where they are likely to land rather than the cheapest thing the agency will agree to sell. The record evidences B2B and software work here.
- Kalungi (full service from $50,000/mo): Third, and it marks the top of the same published scale: a full-service engagement stated at fifty thousand a month, for companies buying an entire marketing function rather than a campaign. Publishing a number that large is a filter, which is what it is for.
- Gorilla 76 (no price published): Fourth. No price, but the narrowest published claim of the eleven: industrial and manufacturing B2B specifically, which is a category with genuinely different buyers and a claim that can be tested by asking for three current clients in it.
- Ironpaper (no price published): Fifth. Publishes a dedicated B2B marketing page rather than a B2B line on a general menu, which is the weakest of the signals here and still more than most of the eleven offer.
What a B2B advertising agency can and cannot be held to
It can be held to activity: campaigns built, creative produced, audiences defined, tests run, reports delivered on a stated day. It cannot be held to pipeline, because it controls neither your sales team nor your buying committee. Write the activity into the contract as the deliverable and keep pipeline as the reported outcome. Agencies that promise pipeline are either misleading you or about to optimise for a metric that looks like pipeline and is not.
The audience is small, so measurement behaves differently
When the addressable market is a few thousand companies, campaigns never reach statistical significance and the platform's optimisation has very little to learn from. That changes the job: manual judgement rather than automated optimisation, quality of enquiry rather than cost per lead, and account-level reporting rather than aggregate conversion rates. Ask a prospective agency how it works an account with a handful of conversions a month, and listen for whether the answer mentions statistics or judgement.
Ask what happens to the creative and the audiences when you leave
Advertising accounts, audience definitions, conversion configuration and creative files are assets you funded, and in B2B the audience lists in particular take a long time to build. Create the ad accounts under your own ownership, keep the creative source files in the contract as a deliverable, and agree that audience definitions are documented rather than living in somebody's head. This costs nothing at the start and a great deal at the end.
The two questions that sort a shortlist
Which of our competitors have you worked with, and what happened. And what would you refuse to do for a client. The first tells you whether they know the category and whether there is a conflict; the second tells you whether they have a standard. In a category where results take quarters to appear, the answers to those two are more predictive than any case study.
Judge the first quarter on inputs, deliberately
Agree at the outset that the ninety day review is about whether the work was done to standard, the targeting matched the account list, the creative was approved on time, the reporting arrived. Revenue outcomes get reviewed at six months and a year. Without that agreement the first quarterly meeting becomes an argument about a number neither side can yet read, and it is the most common point at which B2B agency relationships end badly.
Questions people ask about best b2b advertising agencies
What does a B2B advertising agency cost?
Of the eleven US B2B agencies in this index, three publish a figure and they range from three thousand a month for a named entry tier to fifty thousand for a full marketing function. Most publish nothing, which is not a red flag in a category where work is genuinely scoped, but it does mean your comparison starts with sales calls and you should decide what to ask before booking them.
Should we hire a B2B specialist or a general agency?
The advantage of a specialist is that it will not propose a consumer playbook for a buying committee of six, and it understands why measurement works differently at small volumes. Test for that competence directly rather than for the label, by asking how they would run an account that produces four conversions a month.
How long before B2B advertising shows results?
Longer than anyone wants, because the sales cycle sets the pace and advertising cannot shorten it. Agree leading indicators that move sooner, such as engagement from named target accounts and content downloads by the right job titles, and review revenue on a longer horizon. Cancelling at three months is cancelling before the first cohort could have closed.
Is LinkedIn always the answer?
It is usually part of it, because the targeting matches how B2B audiences are defined, and it is expensive per click, which punishes weak targeting and weak creative harder than cheaper channels do. Whether it is the right place to start depends on whether your buyers are reachable by job title, which is a question about your market rather than about the platform.