20 Cybersecurity Startups to Watch in 2027

Cyera paid $1 billion for Oasis Security and closed the deal on Sept. 3, 2026, 37 days after Globes reported the agreement on July 28. In late June, Oasis had made CRN’s list of the 10 hottest cybersecurity startups of 2026 so far. Startup lists go stale fast. Notable Capital’s Rising in Cyber 2026 names 30 companies picked by 150 CISOs and security executives, with funding data as of Q1 2026. A CISO setting a 2027 budget needs something narrower from both lists. Which young vendors produced evidence this year that they will still be independent, shipping and staffed when the contract renews?

That question picked these 20. Every company here produced at least one verified 2026 event beyond a valuation, whether a priced round, a named production customer, a shipped product or a public technical result. Valuation earned no one a spot. Eleven of the 20 appear on neither the CRN nor the Notable list.
Eighteen of the 20 closed their latest round in 2026. That money turns into hires, product launches and sales coverage next year, when buyers will feel it. Several companies here have already tied specific 2027 deliverables to the cash.
The research cutoff is Oct. 17, 2026. To qualify, a company had to be privately held and independent on that date. Late-stage companies qualify under the same rule as seed-stage ones, so Cyera and Island stay in. A completed acquisition disqualifies a company. So does an announced sale, which is why Oasis is out.

Securing AI agents
Onyx Security sells a runtime control plane for AI agents to enterprise security teams that already run agents in production. Bessemer Venture Partners led its $113 million Series B on July 29, 2026, bringing total funding to $153 million two years after founding. Crunchbase lists 101 to 250 employees. The platform watches each step of an agent’s reasoning and stops actions that go wrong. Anthropic announced an integration in June. Revolut is the only customer the release names, which is thin for a vendor claiming Fortune 500 accounts. Ask for references before you sign.
Reco started in SaaS security and now finds agents nobody approved. One Fortune 100 customer had 21,000 of them, according to TechCrunch’s report on Reco’s $55 million extension on Sept. 29, 2026. Total funding now stands at $140 million. AT&T is a customer and invested through its venture arm. The buyer is a SaaS security or identity team with sprawl across hundreds of apps. Crunchbase puts headcount at 101 to 250. Reco expects ARR, now in the double-digit millions, to triple this year. The catch is a crowded field. TechCrunch put the crowding right in its headline.
HiddenLayer signed more than 50 new platform customers across banking, pharma, airlines and the U.S. defense and intelligence community. It named none of them. Delta-v Capital led a $100 million Series B on Sept. 2, 2026, with Microsoft’s M12 and Booz Allen Ventures in the round. Crunchbase counts 101 to 250 employees. Model and agent security teams in regulated industries are the buyer. The 2027 test is whether those 50 logos become references a peer CISO will take a call about.
Harmonic Security watches what employees paste into AI tools, from browser chat to desktop apps to agent workflows. Crosspoint Capital Partners led a $50 million Series B announced Oct. 14, 2026, and total funding reached $76 million. More than 90 people work there across the U.S. and the U.K. Cisco Cloud Control’s new Agent Builder lists Harmonic as an integration over Model Context Protocol. CISOs who own workforce AI policy buy it. Harmonic claims more than 100 customers and names none.

Identity for agents and machines
Keycard is the exception on funding. Its last priced round dates to October 2025, when it emerged from stealth with $38 million across a seed co-led by Andreessen Horowitz and Boldstart and a Series A led by Acrew Capital. Product carries the 2026 case. On March 19 it released Keycard for Coding Agents for agents from OpenAI, Anthropic and Cursor, and Chime runs it in production. Platform engineering and IAM teams governing coding agents should watch it. Keycard holds less capital than most companies here, and buyers should weigh that.
GitGuardian has the deepest customer bench in the nonhuman identity group. Deutsche Telekom, ING and BASF are customers, and Insight Partners led its $50 million Series C on Feb. 11, 2026. Crunchbase lists 101 to 250 employees. In 2025 the platform detected and fixed more than 350,000 secret exposures, FinTech Global reported. DevSecOps and application security teams buy it. Full NHI lifecycle management, rotation included, is still a plan in the release. Ask for a ship date.
Opal Security puts access governance for employees, service accounts and AI agents into one policy engine. Greylock and Battery Ventures led $23 million in new funding on June 4, 2026, for $59 million in total. Databricks runs 86,000 just-in-time access requests through it, and more than 60% of Opal’s staff joined after the start of 2026, per the release on Yahoo Finance. IGA owners replacing legacy access reviews are the buyer. A team that new has to prove it can support a large rollout.

AI-enabled security operations
7AI raised its $130 million Series A in December 2025, led by Index Ventures, CRN reported. The 2026 numbers carry the case. By May 26 its agents had run more than 7 million investigations, the customer base had grown 3x in a quarter and headcount had grown 47% in a quarter, the company said. SOC leaders and MSSPs buy it. Every one of those figures is self-reported. Run your own false-positive test.
Torq spent 2026 buying context. Merlin Ventures led its $140 million Series D on Jan. 11, lifting total funding to $332 million. In May it announced it would acquire Jit for Jit’s AI context graph. Marriott, PepsiCo and Siemens are customers. Large enterprise SOC teams are the target. Before paying for the combined product, ask how far the Jit integration has gotten.
Tenex.AI pairs AI agents with human analysts and sells the result as managed detection and response. Crosspoint led its $250 million Series B on March 31, 2026. Tenex says it processes 100% of alert telemetry in under a minute and holds more than $25 million in contracted revenue. Headcount grew 318% in a year, with 250 more hires planned. That growth is the risk. Midmarket and enterprise MDR buyers need analyst quality to hold while the bench grows that fast.

Exposure management and offensive testing
Armadin closed the largest Series B on this list, a $255.5 million round on Oct. 1, 2026 led by Andreessen Horowitz and Accel. It has now raised $445 million. Its agent swarms chain vulnerabilities into validated attack paths for Fortune 500 and government buyers. The release names no customers and gives no technical metrics. Buyers get a founding team’s track record and no public proof.
XBOW reached the top of the HackerOne leaderboard before its latest round, public validation most rivals lack. DFJ Growth and Northzone led a $120 million Series C on March 18, 2026. Accenture Ventures, NVIDIA’s NVentures and Samsung Ventures added $35 million on May 6, bringing the Series C to $155 million. Application security and red teams are the buyer. A leaderboard rank says little about how XBOW performs against your own apps.
Horizon3.ai is the scale player in autonomous pentesting. NightDragon and NEA co-led a $250 million Series E on Aug. 3, 2026. The company says NodeZero protects more than 7,000 organizations, four of them in the Fortune 10. Vulnerability management teams and MSSPs buy it. NodeZero tests production systems. Check its guardrails in a staging window first.
Hadrian uses AI agents to prove which external exposures an attacker can actually exploit. Forgepoint Capital International and Smartfin co-led a $40 million round on Oct. 6, 2026, bringing total funding to $65 million. McKesson, NBCUniversal and TotalEnergies are customers, and its Nova agent runs pentests on demand. External attack surface teams in Europe and the U.S. are the target. Hadrian has raised a fraction of what Horizon3 and XBOW have.
Reach Security reads the configurations of the security tools a company already owns and closes the gaps between them. Top Tier Capital Partners led more than $50 million in Series B funding on Oct. 13, 2026, with In-Q-Tel and Microsoft’s M12 in the round. Autodesk and Ensemble Health Partners are customers. Security architects running a dozen overlapping tools are the buyer. The 156% return figure in the release comes from a TAG Infosphere ROI analysis. Model it against your own stack.

Data security
Cyera is the late-stage name, and it has a specific 2027 job. Oasis now runs inside its platform as Cyera Identity. Goldman Sachs Alternatives added a $400 million extension to Cyera’s Series G on Sept. 22, 2026. Paramount, Chipotle and Valvoline are customers. Data security leaders at large enterprises buy it. Next year shows whether a $1 billion identity acquisition keeps its roadmap inside a data company.
MIND sells data loss prevention to security teams that lost visibility once employees started pasting into AI tools. Crosspoint led its $72 million Series B on Sept. 17, 2026, bringing total funding to $112 million. It was the first data security company accepted into Anthropic’s Cyber Verification Program and runs across hundreds of thousands of endpoints. Children’s Hospital Los Angeles is a customer. The client base is still small, so growth multiples prove less than they sound.

Beyond the AI frame
Exein secures firmware and device runtime on connected machines, from industrial equipment to robots. Device makers buy it, and enterprise SOCs do not. Headline led a $270 million round on Sept. 15, 2026. Exein says it has secured more than 2 billion devices, and its physical-AI security model is due in the first quarter of 2027, TechCrunch reported. That model has not shipped. Asia Pacific drives half of revenue, so U.S. buyers should check local support.
Island employs 1,000 people, the largest headcount here. Evolution Equity Partners led a $400 million Series F on Sept. 24, 2026. Its enterprise browser now reaches consumer browsers through an extension. Reuters reported PayPal, Amazon and Pfizer as customers. CIOs consolidating VDI and secure access are the buyer. Island says ARR has doubled every fiscal year and does not disclose the base.
Upwind protects cloud workloads at runtime. Bessemer led its $250 million Series B on Jan. 26, 2026, bringing total funding to $430 million, and the company has doubled its workforce since December 2024. Cloud security teams consolidating CNAPP tools buy it. Upwind’s revenue growth claim came without specifics, SiliconANGLE noted. Ask for named references in your industry.
Reading the list
Nine of the 20 sell agent control, agent identity, offensive testing or exposure validation. That concentration says where investors expect 2027 budgets to go. Each limitation below is the first question for the vendor call. Most of them come down to one request, for a production reference you can phone.
| Company | Category | Target buyer | Latest verified funding | Reason to watch | Key limitation |
|---|---|---|---|---|---|
| Onyx Security | AI agent runtime security | Enterprise teams running agents | $113M Series B, July 2026, $153M total (Globes) | Anthropic integration | One named customer |
| Reco | SaaS and AI agent security | SaaS security and identity teams | $55M extension, Sept. 29, 2026, $140M total (BPData) | 21,000 unknown agents found at one customer | Crowded category |
| HiddenLayer | AI model and agent security | Regulated-industry AI security teams | $100M Series B, Sept. 2, 2026, about $156M total (SiliconANGLE) | 50+ new platform customers | No customers named |
| Harmonic Security | Workforce AI data protection | CISOs owning AI use policy | $50M Series B, Oct. 14, 2026, $76M total (SecurityWeek) | Browser, desktop and agent coverage | 100+ customers, none named |
| Keycard | Identity for AI agents | Platform engineering and IAM teams | $38M seed and Series A, October 2025 (FinTech Global) | Coding-agent product in production at Chime | Least capital in the identity group |
| GitGuardian | Secrets and NHI security | DevSecOps and AppSec teams | $50M Series C, Feb. 11, 2026 (Yahoo Finance) | 350,000+ secret exposures fixed in 2025 | NHI lifecycle tools still planned |
| Opal Security | Identity governance | IGA owners | $23M, June 2026, $59M total (SecurityWeek) | 86,000 JIT requests at Databricks | Most staff joined in 2026 |
| 7AI | AI SOC agents | SOC leaders and MSSPs | $130M Series A, Dec. 4, 2025, $166M total (7AI) | 7M+ investigations by May 2026 | Self-reported metrics |
| Torq | AI SOC automation | Enterprise SOC teams | $140M, January 2026 (Torq) | Jit deal adds a context graph | Jit integration unproven |
| Tenex.AI | AI-native MDR | Midmarket and enterprise MDR buyers | $250M Series B, March 31, 2026 (Tenex) | $25M+ contracted revenue | 318% headcount growth |
| Armadin | Autonomous offensive security | Fortune 500 and government | $255.5M Series B, Oct. 1, 2026, $445M+ total (TechCrunch) | Kevin Mandia’s new company | No customers or metrics disclosed |
| XBOW | Autonomous pentesting | AppSec and red teams | $35M Series C extension, May 6, 2026 (XBOW) | Samsung, Moderna and Seznam named as customers | Leaderboard rank is not your environment |
| Horizon3.ai | Autonomous pentesting | Vulnerability management teams, MSSPs | $250M Series E, Aug. 3, 2026 (Reuters) | 7,000+ organizations protected | Production testing needs guardrail checks |
| Hadrian | External exposure and pentesting | Attack surface teams | $40M, Oct. 6, 2026, $65M total (Tech Funding News) | A second agent checks every agent action | About 90 staff, far less capital than rivals |
| Reach Security | Security control exposure | Security architects | $50M+ Series B, Oct. 2026 (FinTech Global) | Reach Everywhere launch | Third-party ROI figure, not your stack |
| Cyera | Data and identity security | Enterprise data security leaders | $400M Series G extension, Sept. 22, 2026 (Calcalist) | Oasis now runs as Cyera Identity | $1B integration underway |
| MIND | AI-era DLP | Security teams losing data to AI tools | $72M Series B, Sept. 2026, $112M total (Infor Capital) | Revenue up more than 17-fold in a year | Dozens of enterprise clients |
| Exein | Embedded and physical AI security | Device makers | $270M Series C, Sept. 15, 2026 (Tech Funding News) | Physical-AI model due Q1 2027 | Model unshipped, half of revenue in APAC |
| Island | Enterprise browser | CIOs consolidating access | $400M Series F, Sept. 24, 2026 (Globes) | 1,000 staff, large named customers | ARR base undisclosed |
| Upwind | Cloud runtime security | Cloud security teams | $250M Series B, Jan. 26, 2026, $430M total (Globes) | Workforce doubled since December 2024 | Revenue growth unspecified |
How I built this list
Crunchbase supplied company status, latest round type and headcount ranges where its profiles exposed them. Every dollar figure and date comes from the company’s own announcement and a second named outlet. The table cites that second outlet, so no source repeats. Announced rounds and total funding appear separately, and the chart shows announced rounds only. I checked every linked page on Oct. 17, 2026. The selection, categories, catalysts and limitations are my analysis.
Related analysis on this site:
- Gartner says frontier AI makes patch speed a vanity metric. Tolerable exposure time replaces it.
- Gartner’s $247.5B security forecast makes post-quantum firewall refreshes the only upgrade through 2030
- AI security news, monthly
This post is my independent analysis and does not represent my employer.


















