Signal-based outbound means reaching out when a company shows it may be ready to buy, such as a new hire in a relevant role, funding, expansion or a change in tools. Since most B2B buyers are not in market at any given time, signals help you find the few who are. They work best with a precise ideal customer.
Key takeaways
- Most B2B buyers are out of market at any moment; Ehrenberg-Bass research suggests only about 5% are in market.
- Signals such as relevant hires, funding, expansion and tool changes point to timing.
- A signal is only useful if the account already fits your ideal customer profile.
- Outreach should reference the signal and the problem it suggests, in a short, plain message.
- In Australia, commercial messages must meet the Spam Act's consent, identification and unsubscribe rules.
What is signal-based outbound?
Signal-based outbound is prospecting triggered by evidence that an account's situation has changed in a way that makes buying more likely. Instead of contacting every company on a list in turn, you watch for events, such as a key hire or a funding round, and reach out when they happen, with a message about why the timing matters.
The logic comes from how B2B buying works. According to research by John Dawes of the Ehrenberg-Bass Institute with LinkedIn's B2B Institute, at any given time only about 5% of potential B2B buyers are in market. The other 95% will not buy for months or years. Contacting everyone equally wastes effort on accounts that cannot act.
Signals do not replace brand building with the 95%. They help a small team spend its outreach where timing is most likely right.
Which signals matter for B2B outbound?
The most useful signals are those that change a buyer's priorities or budget: a new leader in the function you sell to, funding or rapid hiring, a new office or market, a change of tools, a relevant regulation, or engagement with your content. The best signals are specific to what you sell.
| Signal | Why it suggests timing | Example |
|---|---|---|
| New leader in your buyer's function | New leaders review tools and processes | A new COO in a 60-person services firm |
| Funding or rapid hiring | Growth strains existing systems | Ten or more open roles in operations |
| Expansion | New sites or markets need new processes | Opening a second office |
| Tool change | Adjacent change creates openings | Moving CRMs |
| Regulation | New obligations force action | A new reporting requirement in their sector |
The strongest signals for your business usually come from your own wins. Look at your last ten customers and ask what happened just before they bought. Those patterns belong in your ideal customer profile as triggers. The guide to ICP documents for AI shows how to record them.
How do you act on a buying signal?
Check the account fits your ideal customer, identify the right person, and send a short message that references the signal and the problem it likely creates, with one low-effort question. AI can watch for signals and draft the message; a person should review and send it.
A good signal-based email is short and specific. The agency's own outbound rules aim for 35 to 50 words, one call to action and plain text. For example: a new operations leader at a growing firm often reviews how work is tracked across offices; a short note acknowledging the move and asking whether that review is on the list is enough.
Avoid two common mistakes. First, do not pretend to know more than you do; a signal suggests a possible problem, not a certain one. Second, do not reference anything that feels like surveillance. Public, professional changes are fair; private details are not.
Why are signals alone not enough?
Signals point to timing, not fit. A company that raised money but sits outside your ideal customer is still the wrong account. Signals also go stale quickly, many are noisy, and everyone else is watching the same public ones. Fit, timing and a genuinely useful message are all needed.
Three things make signal-based outbound work:
- Fit first. Only act on signals from accounts that match your ideal customer profile.
- Speed with care. Act within days, but with a message that shows you understand the situation.
- A real reason. Connect the signal to a problem your product solves, using customers' own words.
Deliverability matters as much as targeting. According to Google's sender guidelines, bulk senders to Gmail must authenticate with SPF, DKIM and DMARC and keep spam rates under 0.30%. Poorly targeted signal campaigns raise complaint rates fast.
How do you set up signal-based outbound?
Define the signals that preceded your best wins, choose data sources that report them, set up monitoring that checks each signal against your ideal customer profile, have AI draft outreach for a person to approve, and measure reply and meeting rates by signal type. Drop signals that do not convert.
Legal basics come first in Australia. This is general information, not legal advice. According to the ACMA, commercial electronic messages need consent, must identify the sender and must include an unsubscribe that is honoured within five working days. Check how those rules apply to your outreach before you start.
The guide to an ICP-driven outbound engine puts signals into a full system.
Skein builds signal-based outbound workflows where AI monitors and drafts and a person approves and launches; the AI engineering page shows the run end to end. That suits a B2B team with a clear ideal customer and capacity to follow up quickly. A business selling to a tiny, known set of accounts may do better with account-based relationship work.
Frequently asked questions
What is signal-based selling?
Signal-based selling means contacting prospects when they show evidence of changed circumstances that make buying more likely, such as a new leader, funding, expansion or a tool change. It focuses outreach on accounts whose timing looks right, rather than working through a static list in turn.
What are buying signals in B2B?
Common B2B buying signals include a new leader in the function you sell to, funding or rapid hiring, expansion into new offices or markets, a change of tools, new regulation affecting the buyer, and engagement with your content. The best signals are the ones that preceded your own recent wins.
What is the 95:5 rule in B2B marketing?
It is the finding, from John Dawes of the Ehrenberg-Bass Institute with LinkedIn's B2B Institute, that at any given time only about 5% of potential B2B buyers are in market. The other 95% will not buy for months or years, so marketing must reach both groups.
Can AI find buying signals?
Yes. AI can monitor news, job postings and other public sources for signals, check each account against your ideal customer profile and draft relevant outreach. A person should review the signal's relevance and approve any message before it is sent.
Is signal-based outreach legal in Australia?
Outreach must comply with the Spam Act 2003. According to the ACMA, commercial electronic messages need consent, must identify the sender and must include a working unsubscribe honoured within five working days. Check your obligations with an adviser before running campaigns.
Related reading
- Weinberg, Peter, and Jon Lombardo. "The 95:5 rule is the new 60:40 rule." Marketing Week, LinkedIn B2B Institute. https://www.marketingweek.com/peter-weinberg-jon-lombardo-95-5-rule
- Google Workspace Admin Help. "Email sender guidelines." Google, accessed 30 October 2026. https://support.google.com/a/answer/81126
- ACMA. "Avoid sending spam." Australian Communications and Media Authority, accessed 30 October 2026. https://www.acma.gov.au/avoid-sending-spam