Google Ads for vertical SaaS is a different game than horizontal SaaS, and the teams that lose money are usually the ones who do not realize that. When your total addressable market is a few thousand companies in one industry — HR tech for staffing agencies, an EHR for behavioral health clinics, a martech platform for ecommerce brands — you cannot win on volume. There is no volume to win. You win on precision: capturing the small, steady stream of genuinely in-market buyers at the exact moment of intent, and refusing to pay for anything else. This post is how I run paid search for niche, small-TAM SaaS across HR tech, martech, and healthtech.
The headline mistake is importing a horizontal playbook. Broad match plus Smart Bidding works when demand is deep enough for the algorithm to find scale. In a vertical with a few thousand realistic buyers, broad match just spends your budget on adjacent industries and tyre-kickers, and the "learning" never converges because there are not enough conversions to learn from. Precision is not a stylistic choice here — it is the only structure that survives a small TAM.
Exact-match, industry-qualified keywords
The keyword list is where small-TAM verticals are won. Generic category terms — "HR software", "EHR system", "marketing analytics" — are expensive, broad, and mostly searched by people outside your niche. The terms that convert are industry-qualified, bottom-funnel phrases:
- HR tech: "HR software for staffing agencies", "applicant tracking for healthcare recruiters", "payroll for construction crews".
- Martech: "attribution platform for ecommerce", "email automation for Shopify brands", "ABM software for cybersecurity vendors".
- Healthtech: "EHR for behavioral health", "telehealth platform for physical therapy", "practice management for dental groups".
Run these on exact and phrase match, not broad. Yes, the search volume per term is low — sometimes a few dozen searches a month. That is fine. You are not trying to fill a funnel; you are trying to catch the handful of buyers who are actively shopping for exactly what you sell. A tight set of 30–80 of these phrases will usually out-convert a broad-match campaign at a fraction of the cost. If you want a second opinion on whether your current keyword set is too broad for your market, that is exactly the kind of thing a Google Ads audit surfaces fast.
Tight negatives are non-negotiable
In a vertical account, your negative keyword list does as much work as your active keywords. The whole risk in a small TAM is leakage — spending on searches from adjacent industries that look similar but will never buy. An "EHR for behavioral health" campaign needs to block veterinary, dental, and chiropractic modifiers. An "HR software for staffing agencies" campaign needs to block free, students, jobs, and career searches that match loosely.
I build negatives in three layers: an account-level master list of junk (free, jobs, salary, login, crack, reddit), a campaign-level list that fences out adjacent verticals, and a weekly search-terms review that catches the leakage the first two layers miss. In a high-CPC SaaS vertical, a single irrelevant click can cost $10–$40, so blocking thirty bad query patterns a week is real money. Vertical accounts that do not maintain negatives quietly bleed 20–40% of spend on out-of-market traffic — and the dashboards still look busy. For the mechanics of building these lists well, see our guide on how we manage SaaS accounts.
Audience and industry targeting
Keywords tell you what someone is searching; audiences help confirm who they are. Google Ads does not give you LinkedIn-style firmographic targeting — you cannot say "only people who work at staffing agencies" — so you approximate it. The strongest signal for tight B2B verticals is Customer Match: upload a hashed-email list of known in-vertical accounts and prospects from your CRM, and use it both to target and to inform Smart Bidding about what a real buyer looks like.
Beyond that, layer in-market and custom audiences in observation mode first — do not target on them until you have data showing they convert. A custom audience built from competitor URLs and industry-association sites can be a useful signal in a niche. But in small-TAM verticals, audiences are a refinement on top of intent keywords, not a replacement for them. The keyword is still doing most of the qualifying; the audience just tilts the odds. Treat every audience as a hypothesis you validate against pipeline, not clicks.
Vertical-specific constraints (HIPAA, finance)
Some verticals carry constraints that override every tactic above, and healthtech is the clearest. Google will not sign a BAA and is not a HIPAA business associate, which means protected health information must never enter the Ads ecosystem — not in conversion uploads, not in Customer Match lists, not in URL parameters, not in remarketing tags firing on pages that reveal a condition. In practice that means server-side conversion tracking that strips identifiers, Customer Match built only from non-PHI lists (a newsletter signup is fine; a patient roster is not), and landing pages reviewed by your compliance team before they collect anything health-related.
Regulated finance and fintech verticals have their own version: Google requires advertiser verification and sometimes local licensing for financial-product ads, and disclosures have to appear in the creative. The pattern across regulated verticals is the same — the compliance constraint shrinks your available tactics, so the precision matters even more, because you have fewer levers to pull. Get the conversion tracking setup right and compliant first; everything downstream depends on it.
How small-TAM verticals actually win
Reset your expectations before anything else. A vertical account will show low impression volume, low click volume, and — if it is built well — high conversion rates and an efficient cost per qualified opportunity. That is success, not under-delivery. The instinct to "get more volume" by broadening match types is the single fastest way to wreck a niche account, because broad reach in a small market is, by definition, reach into the wrong market.
So the playbook is: a tight exact and phrase keyword set on industry-qualified terms, aggressive multi-layer negatives reviewed weekly, Customer Match and observation audiences to confirm fit, bidding toward qualified pipeline rather than raw form fills, and full respect for whatever compliance regime your vertical lives under. Do those five things and a market of a few thousand companies can support a healthy, profitable paid-search channel — one that captures nearly every in-market buyer at the moment they are ready.
I run paid search this way for SaaS companies in exactly these verticals, managing the keyword discipline and negative lists that a small TAM demands. If you want a specialist to look at whether your account is built for precision or accidentally built for volume, the case studies show how it plays out, or you can talk to a SaaS Google Ads consultant directly.
