Horizon3 competitors and alternatives
As of Nov 13, 2026, Alion lists 10 companies most like Horizon3: A, HackerOne, Bugcrowd, Xbow, Bishop Fox, Synack, Cracken, Sybil, Safe Security and Depthfirst.
- Horizon3 itself has 193 open roles on Alion.
- Of them, Depthfirst is hiring the most, with 21 open roles.
- Bugcrowd has raised the most venture funding on record: $189.2M.
- Open roles at Depthfirst rose the most: from 19 on Oct 12, 2026 to 21 now.
Horizon3 and its competitors compared
Open roles are the postings Alion lists today; their change is shown only for career sites that state posting dates. Funding is the venture money on record. A dash means Alion holds no figure.
| Company | Open roles | Change | Raised | Last round | Lead investors | Employees | Headquarters | Main technologies | Hiring in |
|---|---|---|---|---|---|---|---|---|---|
Horizon3
This company
|
193 | +54%since Oct 12, 2026 | $390M | Series E $250M2026 | Craft Ventures | 201-500 | San Francisco, United States | AWS, Python, Azure | United States, Netherlands, Singapore +8 more |
A
In common: Penetration Testing, Vulnerability Management, Cybersecurity AI · Python, SQL, PostgreSQL |
4 | – | – | – | – | 11-50 | Tel Aviv, Israel | AWS, Azure, GCP | Israel |
HackerOne
In common: Penetration Testing, Vulnerability Management · Python, Go, SQL · headquarters in United States |
14 | – | – | – | – | 201-500 | San Francisco, United States | AI Agents, Anthropic, Red Teaming | United States, India, United Kingdom |
Bugcrowd
In common: Penetration Testing, Vulnerability Management · Python, Go, TypeScript · headquarters in United States |
11 | – | $189.2M | Venture round $102M2024 | – | 201-500 | San Francisco, United States | Python, Linux, Kali Linux | United States, India, Mexico +1 more |
Xbow
In common: Penetration Testing, Cybersecurity AI · Go, TypeScript, PostgreSQL · headquarters in United States |
3 | – | $155M | Venture round $35M2026 | – | 51-200 | Seattle, United States | Copilot, TypeScript, AWS | United Kingdom |
Bishop Fox
In common: Penetration Testing, Vulnerability Management · Python, Go, TypeScript · headquarters in United States |
11 | – | $87.7M | Venture round $51.1M2022 | – | 201-500 | Tempe, United States | Python, AWS, LLM | Mexico, United States |
Synack
In common: Penetration Testing, Vulnerability Management · Python, Go, TypeScript · headquarters in United States |
9 | – | – | – | – | – | Washington, United States | AI Agents, GCP, Python | United Kingdom, United States |
Cracken
In common: Penetration Testing, Cybersecurity AI · Python, TypeScript, C++ · headquarters in United States |
9 | – | – | – | – | 201-500 | Palo Alto, United States | AI Agents, React.js, GitHub | United States |
Sybil
In common: Penetration Testing, Cybersecurity AI · Python, TypeScript, PostgreSQL · headquarters in United States |
4 | – | – | – | – | 51-200 | San Francisco, United States | OpenAI, AI Agents, Python | United States |
Safe Security
In common: Vulnerability Management, Cybersecurity AI · Python, Go, TypeScript · headquarters in United States |
19 | – | – | – | – | 51-200 | Palo Alto, United States | Python, AWS, Amazon S3 | India, United States |
Depthfirst
In common: Cybersecurity AI, Penetration Testing · Python, Go, TypeScript · headquarters in United States |
21 | +11%since Oct 12, 2026 | $120M | Venture round $80M2026 | Meritech Capital | 11-50 | San Francisco, United States | Databricks, AI Agents, Python | United States |
How the list is made
The list comes from Alion's similar-companies engine, the same one AI agents query through the Alion MCP server. A company ranks higher when it shares more of Horizon3's industry segments and is less spread over others, when its job postings name the same technologies, when it is headquartered in the same country and when its size is close. The list is rebuilt every week.
How to cite this page
These figures are published under a free licence. You may reuse them, including commercially, as long as you credit Alion and link back to this page.
Alion, "Horizon3 competitors and alternatives: 10 similar companies compared on hiring and funding", as of Nov 13, 2026. https://alion.io/company/horizon3/competitors