The best outsourced SDR agency for a cybersecurity company is one that has already booked meetings with security leaders, and can show you the results. Here's the short answer:
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Security vendors selling to enterprise CISOs, with phone, email and LinkedIn run by dedicated specialists: BizDev Labs
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Phone-first programs with a long security track record, including the UK: memoryBlue
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Security startups that want an embedded SDR with detailed pipeline reporting: Whistle
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Month-to-month, research-heavy outbound with US-based reps: Leadium
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Onshore reps, with a pilot before a longer commitment: Martal Group
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Multilingual, global campaigns: Callbox
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US-based phone and email SDRs on month-to-month terms: SalesHive
BizDev Labs publishes this list and ranks itself first, for the buyer it was built for. Every other agency is described from its own public pages.
Why selling security is different
Security buyers are some of the hardest people in B2B to reach, and some of the most skeptical once you do. Four things set this market apart:
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CISOs hear from vendors constantly. A cold email that sounds like every other security pitch gets deleted on sight. The first conversation has to be about a specific risk the buyer already worries about.
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Trust comes before interest. Security leaders buy from vendors they believe won't create new risk. A rep who stumbles on the basics, or overclaims what the product stops, ends the conversation and can burn the account.
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The buyer is a committee. The CISO, security architects, the SOC lead, IT and procurement all weigh in, so outbound has to reach more than one person at each account.
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Cycles are long, and proof matters. Pilots, proofs of concept and security reviews take months. Early outbound should be judged on qualified meetings and pipeline, not closed revenue.
That's why the agency you choose matters more in security than in most markets. The wrong one doesn't just book bad meetings. It puts your brand in front of the people you most need to impress, with the wrong message.
How we picked
Every agency on this list had to show public work for security companies. Beyond that, we judged each one, BizDev Labs included, on:
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Named security clients with a result. A case study or testimonial from a cybersecurity vendor, not just a logo.
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Reach into security leadership. Evidence of meetings with CISOs, security directors or other senior security titles.
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Phone, LinkedIn and email together. Security buyers rarely answer cold email alone.
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Reps who can hold the conversation. Scripts you approve, recorded calls you can review, and enough training to talk about the buyer's risk without overclaiming.
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Brand protection. Nothing goes out without your sign-off, and your main domain stays out of cold email.
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What you keep. Lists, scripts and recordings stay with you when the engagement ends.
These are best-for calls based on each agency's public pages, checked in October 2026, not an independent performance ranking.
The shortlist at a glance
| Agency | Best for | Security results on your account | Specialist per channel |
|---|---|---|---|
| BizDev Labs | Security vendors selling to enterprise CISOs | Artemis Security: 38+ meetings in five months. Sweet Security: Fortune 500 CISO meetings. Also Hush, Safe Security, Aura, LayerX, Remedio and Token | Yes, plus a strategist and GTM engineer |
| memoryBlue | Phone-first programs | Ask for references with your buyer titles | Check: generalist SDR seats |
| Whistle | An embedded SDR | Ask for references with your buyer titles | Check: one SDR across channels |
| Leadium | Month-to-month research-heavy outbound | Ask for meetings, not lead counts | Check before signing |
| Martal Group | Onshore reps with a pilot first | Ask for named security results | Check before signing |
| Callbox | Multilingual, global campaigns | Most security case studies are anonymous | Check: shared campaign team |
| SalesHive | Phone and email on month-to-month terms | Client names kept private | Check: LinkedIn coverage |
Descriptions of other agencies come from their own public pages in October 2026. Confirm results, staffing and terms directly before you sign.
The agencies
1. BizDev Labs
Best for: security vendors selling to enterprise CISOs, with every channel run by a dedicated specialist.
BizDev Labs runs phone-led outbound with a five-person team: a strategist, a GTM engineer who builds the lists, and dedicated specialists for cold calling, cold email and LinkedIn. Campaigns go live 14 days after signature, every call is recorded, and nothing goes out without your approval.
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Security clients: Artemis Security, Hush Security, Safe Security, Aura, LayerX, Sweet Security, Remedio and Token Security.
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Security proof: Artemis Security booked 38+ meetings in five months, most of them by phone. Sweet Security booked meetings with Fortune 500 CISOs. Hush Security describes 4 to 5 quality meetings a week, with introductions to Bank of America, Johnson & Johnson and HSBC.
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Worth knowing: programs start at $10,000 a month, the flagship five-person team is $14,000, and there's a 6-month minimum with quarterly exit gates.
2. memoryBlue
Best for: phone-first programs with a long security track record, including the UK.
memoryBlue has run outsourced SDR teams since 2003 and leans heavily on the phone. Its model is built around developing SDRs who may later be hired into your team.
- Check before signing: who will actually call your accounts, how much security selling experience they have, and whether email and LinkedIn are run by the same person. There is no single published rate.
3. Whistle
Best for: security startups that want an SDR embedded in their team.
Whistle places SDRs as an extension of your team, working phone, email and LinkedIn.
- Check before signing: whether one person covers every channel, who builds the lists, and how the program continues if your SDR leaves. Pricing is not published.
4. Leadium
Best for: month-to-month outbound with heavy research and US-based reps.
Leadium works email, phone, LinkedIn, SMS and gifting, with a focus on data research.
- Check before signing: how many qualified meetings with security leaders, not leads, you should expect, and who writes the messaging. Pricing is not published.
5. Martal Group
Best for: onshore reps, with a pilot before a longer commitment.
Martal Group's sales executives work cold email, LinkedIn and phone, supported by an AI outreach system.
- Check before signing: named security references with your buyer titles, and what the 3 to 4 month pilot costs. Dollar pricing is not published.
6. Callbox
Best for: multilingual, global security campaigns.
Callbox runs phone, email, LinkedIn and ABM campaigns in many languages from teams around the world.
- Check before signing: who is assigned to your campaign, whether security case studies can be named, and the full quarterly cost.
7. SalesHive
Best for: US-based phone and email SDRs on month-to-month terms.
SalesHive's security programs run mainly on phone and email.
- Check before signing: whether LinkedIn is included, which security clients you can speak to, and the quote for your scope.
Seven questions to ask before an agency calls CISOs for you
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Which security companies have you booked meetings for, and with which titles? Ask for names and roles, not just logos.
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Can I hear a recorded call with a security leader? It's the fastest way to judge whether their reps can hold the conversation.
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Who writes the script, and do I approve every line? Nothing about your product should reach a CISO without your sign-off.
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How do you protect our brand and domains? Cold email should run from separate, warmed domains, never your main one.
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How many people will you reach at each account? A single contact per account rarely moves a security deal.
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What counts as a qualified meeting? Agree the titles, company size and the problem the buyer must confirm, in writing.
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What do we keep if we stop? Lists, scripts and call recordings should be yours.
FAQ
What does an outsourced SDR agency do for a cybersecurity company? It builds lists of security leaders at your target accounts, contacts them by phone, email and LinkedIn, qualifies interest and books meetings for your account executives. The better agencies also write and test the messaging with you and report on every call and sequence.
Can an outsourced SDR team really get meetings with CISOs? Yes, when the reps lead with a specific risk the buyer already cares about and the program leans on the phone. BizDev Labs booked meetings with Fortune 500 CISOs for Sweet Security and 38+ meetings in five months for Artemis Security, most of them by phone.
How much does an outsourced SDR agency cost for a security company? Most agencies quote each program. Among published prices, BizDev Labs starts at $10,000 a month, with its five-person team at $14,000. Most other agencies on this list only quote on request.
How long until the first meetings? BizDev Labs goes live 14 days after signature, with first meetings typically in week three. Security sales cycles are long, so judge the first quarter on qualified meetings and pipeline rather than closed deals.
Should a security startup outsource SDRs or hire in-house? Hiring takes time: The Bridge Group's 2025 research puts average SDR ramp at 3.0 months, average tenure at 1.9 years and annual attrition at 40%. An agency skips the hiring and ramp, while an in-house team builds long-term product knowledge. See outsourced vs in-house SDRs.
Bottom line
If you sell security to enterprise buyers, pick an agency that has already reached CISOs for companies like yours, lets you hear the calls, and never sends a word about your product without your approval. That's how BizDev Labs works with security vendors like Artemis Security, Sweet Security and Hush Security: a five-person team, live in 14 days, with every list, script and recording staying yours.
See our cybersecurity outbound page for more on how we work with security companies.
Book a call and we'll tell you straight if we're not the right fit.
Sources
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BizDev Labs: cybersecurity page, Artemis Security, Sweet Security, Hush Security, pricing
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memoryBlue: cybersecurity
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Whistle: cybersecurity
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Leadium: cybersecurity
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Martal Group: cybersecurity
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Callbox: cybersecurity
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SalesHive: cybersecurity
