Top Security Companies in London (149)

Strong Revenue Growth: Reported consecutive years of strong year-over-year revenue growth through 2022 and was included on Deloitte’s Technology Fast 500 for rapid multi‑year expansion. Financial press in February 2026 also cited more than $100 million in revenue alongside a potential sale valuing the company above $1 billion.

Market Expansion: The company notes serving 3,500+ organizations across 150+ countries and expanded its European presence with a London office to support international demand. Customer count progressed from “more than 3,000” earlier in the period to “more than 3,500,” indicating continued scaling.

Innovation-Driven Growth: New AI‑powered capabilities and analytics launched in 2025–2026, plus the acquisition of Pyrra to deepen social intelligence, signal ongoing product investment. Leadership additions, including the first President and Chief AI Officer in May 2026, were positioned as supporting continued growth and innovation.

Strong Revenue Growth: Revenue is accelerating, with early‑2026 results exceeding the prior year’s pace and the full‑year outlook raised to reflect continued momentum. Large‑customer additions further reinforce top‑line expansion at scale.

Healthy Cash Flow: Operating and free cash flow remain substantial, including strong generation in Q2 2026 and across FY2025. This liquidity provides flexibility to invest while sustaining growth.

Innovation-Driven Growth: New AI‑powered capabilities—such as Bits AI offerings, GPU Monitoring, and an agent builder—were launched around Q1–Q2 2026 and at DASH 2026, supporting usage and upsell. Broader multi‑product adoption and growth in high‑ARR cohorts are highlighted across recent updates.

Strong Revenue Growth: Revenue is rising rapidly, with Q2 FY2026 results well above the prior year and management increasing the full‑year outlook while guiding continued momentum into Q3. These signals indicate sustained top‑line acceleration rather than a one‑off spike.

Resilient & Sustainable Growth: Contracted demand expanded, as current remaining performance obligations grew strongly in Q2 FY2026. Upmarket customer gains and elevated net retention further point to durable expansion from existing cohorts.

Innovation-Driven Growth: An AI/edge “inference layer” launch and ongoing Workers AI/Radar updates show active platform expansion and growing developer adoption. This product velocity positions the business to capture emerging AI‑driven workloads.

Strong Revenue Growth: Top line is described as expanding steadily in recent years, with continued growth expected. Separate reporting cites roughly $500 million in annual revenue and rapid momentum, even as exact figures vary.

Healthy Cash Flow: Cash generation has improved enough for a late‑2025 credit rating upgrade, with projections to produce over $100 million in free cash flow within the next 12–24 months. Leverage is expected to trend down alongside strong margins.

Customer Loyalty & Retention: Retention is characterized as consistently high with net expansion of spend, signaling durable relationships and effective cross‑sell within the installed base. A sizable customer count (over 4,000 organizations) supports stickiness across regions.

Product Line Growth: Recent launches tied to AI-era development—such as Sonar Vortex, the SonarQube Remediation Agent, a unified SonarQube CLI, and expanded code‑security capabilities—signal an actively expanding product suite. The acquisition of Gitar adds AI‑native code review to the platform, indicating continued investment and category reach.

Market Expansion: Expansion moves include establishing a regional headquarters in Singapore and positioning the platform as an independent verifier layer across AI models and common SDLC tools. Marquee adopters and broad Fortune 100 penetration suggest reach across industries and geographies.

Strong Market Position & Advantage: Scale indicators such as 7M+ developers across 400k+ organizations, ‘750B+ lines of code analyzed daily,’ and logos like Nvidia, AstraZeneca, and Ford point to an entrenched position. Headcount rising from roughly 700 (2023) to about 1,000 (2026, estimate) further supports operational capacity at scale.

Strong Revenue Growth: Revenue is reported to have grown 26% in FY2024, alongside roughly 30% ARR growth in 2023 after surpassing the $100M milestone in 2022. This indicates sustained top-line expansion across consecutive years.

Profitability: The company reports remaining profitable and cash‑flow positive while growing in FY2024. This suggests operational discipline alongside expansion.

Investor Backing & Capital Strength: A July 2024 majority investment led by Vista Equity Partners valued the company at about $1.2B, with participation from TCV and KKR. This financing signals external confidence and provides resources for further expansion.

Market Expansion: In 2025–2026, network-level call protection and branded calling launched or expanded with Vodafone UK, O2 Telefónica (Germany), MasOrange (Spain), Telenor Sweden, DNA Finland, and Bouygues Telecom (France). These integrations broaden addressable users and strengthen enterprise demand across multiple European markets.

Strategic Partnerships: Hiya’s technology is embedded with top OEMs and carriers, including Samsung Smart Call and AT&T’s ActiveArmor ecosystem. Such deep, default distribution creates defensible network effects as new capabilities like scam/spam detection, branded caller ID, and AI voice/deepfake detection roll out.

Strong Market Position & Advantage: Company materials cite a platform serving 500M+ users across 40+ countries and 221B calls observed in 2023. This operating scale underpins detection efficacy and makes the platform attractive to large operators and enterprises.

Strong Revenue Growth: Revenue momentum is highlighted by nearly 50% year-over-year ARR growth from large enterprise customers in 2025. Repeat inclusion on the Inc. 5000 (2026) and Deloitte Technology Fast 500 (2024/2025) underscores sustained multi-year expansion.

Strong Market Position & Advantage: Competitive standing is reinforced by a Leader placement in Forrester’s Third-Party Risk Management Wave (Q1 2026) and consecutive G2 “Leader” badges into Summer 2026. These signals indicate solid traction with buyers in an active GRC/TPRM market.

Innovation-Driven Growth: Product velocity is evident in the Spring 2026 release of AI-powered workflow agents and new integrations aimed at enterprise use cases. Governance-oriented moves such as appointing a new CISO in May 2026 align with scaling an enterprise-grade, security-focused roadmap.

Strong Revenue Growth: Revenue is rising briskly, with the latest quarter up year over year and full‑year FY2026 guidance raised for both revenue and ARR. Prior billings and deferred revenue growth indicate healthy demand heading into FY2026.

Strong Market Position & Advantage: Independent analyst evaluations place the company as a leader in SSE/SASE and note frequent inclusion on enterprise shortlists. A broad global footprint and regulatory certifications bolster competitiveness in regulated and international markets.

Product Line Growth: Expansion in newer offerings—such as Data Security, AI‑focused modules, and Zero Trust Branch—shows meaningful traction. Metered, non‑seat‑based solutions accounted for a sizable share of new ACV, suggesting broader monetization beyond core seats.

Strong Market Position & Advantage: Industry recognitions place the company in the Leaders tier across key AppSec categories, signaling durable competitive standing. Ongoing ecosystem visibility, such as a 2025 Google Cloud Technology Partner of the Year award, reinforces presence with major platforms.

Product Line Growth: The platform has broadened via acquisitions like Helios and Probely to add visibility, DAST, and API security alongside SCA/SAST. Momentum in newer modules, including Snyk Code surpassing about $100M in ARR and launches like Evo, supports larger account expansion and upsell.

Innovation-Driven Growth: The company is leaning into AI-native security with investments and acquisitions (e.g., Invariant Labs) and AI-assisted workflows. AI-forward offerings and product announcements indicate a roadmap aligned to modern development patterns.

Strong Market Position & Advantage: Johnson Controls is characterized as a global leader by share and scale in building automation and integrated commercial building technologies, supported by a broad end-to-end portfolio across controls, HVAC, fire, security, and services.

Strong Revenue Growth: Recent performance indicates accelerating growth signals, including mid-single-digit organic sales growth alongside exceptional order momentum and a record backlog that supports forward revenue conversion.

Profitability: Earnings power appears to be improving, with adjusted EPS growth and margin expansion in recent quarters, reinforced by management raising full-year EPS guidance.

Strong Revenue Growth: Recent results show record annual revenue with continued quarterly increases and a raised full‑year outlook. A record multibillion‑dollar backlog adds visibility to near‑term growth.

Profitability: Operating margins remain robust, and full‑year earnings advanced materially, with non‑GAAP profitability metrics improving in recent periods. Management highlights operating leverage alongside higher sales.

Strong Market Position & Advantage: The company holds a dominant position in mission‑critical public‑safety communications and offers an integrated platform spanning radios, video security, and command‑center software. A substantial patent portfolio and long‑standing public‑safety relationships reinforce its moat.

Strong Market Position & Advantage: Independent analyst evaluations across 2024–2025 consistently place Check Point in the Leaders cohort for enterprise and hybrid‑mesh firewalls and also in email security. Trade coverage and third‑party testing corroborate top‑tier firewall efficacy and broad recognition.

Profitability: Non‑GAAP EPS expanded strongly in 2025 and continued to grow in early 2026, indicating margin strength alongside the subscription mix shift. Company updates highlight sustained earnings momentum despite uneven hardware demand.

Healthy Cash Flow: Recent periods show rising operating cash generation and higher adjusted free cash flow, with ongoing share repurchases signaling capacity for capital returns. Cash performance has remained solid through FY2025 and into 2026.

Strong Market Position & Advantage: Independent rankings place the company at No. 1 globally and it leads major air and missile defense portfolios such as Aegis BMD and PAC‑3, reinforcing competitive advantage. Broad adoption of the F‑35 and leadership across four large segments further underpin its position.

Resilient & Sustainable Growth: A record ~$193.6–$194B backlog provides multi‑year revenue visibility across segments. Multi‑year munitions frameworks and planned PAC‑3 production ramps point to sustained demand.

Strong Revenue Growth: Sales rose 6% in 2025 to $75.0B, with segments like Missiles & Fire Control and Aeronautics expanding and guidance indicating further top‑line growth in 2026. Record F‑35 deliveries and new missile/space milestones contribute to the outlook.

Strong Market Position & Advantage: Repeated placement as a Leader in the Gartner Magic Quadrant for SIEM, coupled with added scale from the 2024 LogRhythm merger, signals durable competitive positioning. Consistent analyst validation and a broadened installed base support ongoing relevance against large platform rivals.

Innovation-Driven Growth: Early introduction of machine learning in SIEM and recent agentic AI advances (e.g., Exabeam Nova) reflect a sustained innovation cadence. Frequent platform updates and new capabilities across SIEM, UEBA, and SOC automation suggest continued product momentum.

Strategic Partnerships: Expanded ecosystem ties, including intelligence integrations (e.g., Recorded Future) and unified partner programs, strengthen go‑to‑market reach. Channel-led motions and MSSP-focused initiatives indicate an active push to scale through partners.

Strong Market Position & Advantage: Siemens holds leading positions across industrial automation and software, smart infrastructure, mobility, and healthcare technology (via Siemens Healthineers), with multiple segments ranked first or second and significant contract wins expanding backlog. This breadth provides competitive advantage across diverse high-growth end markets.

Healthy Cash Flow: The company reports strong free cash flow at the Group level in FY2024 and subsequent quarters, supporting investment, M&A, and a new multi‑year share buyback program. Robust cash conversion across industrial businesses underpins financial flexibility.

Resilient & Sustainable Growth: Comparable revenue increased in FY2024 and continued to rise in FY2025 quarters, while orders and book‑to‑bill above 1, a record order backlog, and confirmed FY2025 guidance provide visibility. Growth is supported by electrification, data‑center demand, rail investments, and ongoing portfolio actions.