One filter. Campaign one. 1%+ employee headcount growth in the last 12 months. Positive replies lifted 30 to 50%.
That is not a copy change. That is not a new subject line. That is one Clay column added to the list build.
The Filter
In Clay, use the Find Company Headcount Growth integration. Filter for companies with 1% or more employee growth over the last 12 months. That is it.
We ran this on campaign one for a barber shop client. The barber was "just chilling" — flat growth, no hiring, no new locations. The email was fine. The list was wrong.
"Barber 'just chilling' — flat growth, no hiring."
When we added the headcount growth filter, positive replies jumped 30 to 50%. Same copy. Same subject. Same sending infrastructure. Different list.
The List Is the Message
"The list is the message."
You can write the best email in the world. If you send it to a company that is not growing, not hiring, and not investing, you are shouting into an empty room.
Headcount growth is a proxy for: this company has budget, this company is active, this company is not dying. It is the cheapest signal in Clay after open jobs.
For six ways to find growth signals in Clay, see our earlier post on Building Lists of Companies Showing Any Sign of Growth. Headcount growth is method #3 in that framework. This post is what happens when you actually deploy it on campaign one.
Signals Tier: Offer > Signals
"Signals tier — offer > signals."
A growth filter does not save a bad offer. If your offer is weak, no amount of headcount growth will fix it. But if your offer is solid and your replies are flat, check the list before you rewrite the email.
The hierarchy:
- Offer — is the value proposition clear?
- List — are you reaching companies that can buy?
- Copy — is the email specific to the segment?
- Infrastructure — domains, warmup, sending limits
Most people jump to copy when the list is the problem.
How to Build It in Clay + Prospeo
- Start with your ICP table in Clay (industry, size, location filters)
- Add Find Company Headcount Growth column
- Filter: growth >= 1% over 12 months
- Enrich contacts with Prospeo for email validation
- Export to Smartlead or connect via Audience
We use Prospeo v2 for the email waterfall. If you have not explored it yet, see Exploring Prospeo v2 Database.
The headcount growth column costs credits. At 1% filter on a 10,000-row ICP, you might lose 60-70% of rows. That is the point. You are paying to not email the wrong companies.
Segmentation That Changes the Sentence
This filter pairs directly with check 4 in our 5-check copy framework: segmentation that changes the sentence.
A company growing 15% in 12 months gets a different opening than a company that is flat. "Saw you added 3 barbers this year" vs "Saw the review Karen left." The headcount filter makes that segmentation possible.
FAQ
Is 1% the right threshold? Start at 1%. If your ICP is large enough, try 3% or 5%. The barber client used 1% because local businesses grow slowly. SaaS companies might need 5%+.
Should I mention growth in the email? No. Use it as a filter, not a mail merge field. Nobody wants "Hey John, I saw you've grown by 1.28%." Use the signal to pick who gets the email, not what the email says.
What if my ICP is too small after filtering? Lower the threshold to 0.5% or add a second signal (open jobs, new hires). See the full growth signals post for six methods.
Does this work for local businesses? Yes. The barber case study is a local business. Headcount growth in Clay pulls from LinkedIn data, which is thinner for local shops. Pair it with Google Maps scraping for local ICPs: Google Maps Lead Generation.
What I Would Do This Week
- Pull your last campaign's list into Clay
- Add headcount growth column
- Filter >= 1%
- Re-send the same copy to the filtered list
- Compare positive reply rate
Apply for a free test campaign at coldoutbound.com.
Key Takeaways
- 1%+ headcount growth in 12 months lifted positive replies 30-50% on campaign one
- The list is the message — fix the list before rewriting copy
- Offer > signals — growth filters do not save bad offers
- Use as a filter, not a mail merge field — never cite the percentage in the email
- Build in Clay + Prospeo — filter, enrich, export
- Pairs with 5-check copy framework for segmentation