Do you mean physical security companies (guards, CCTV, alarm systems, access control) or cybersecurity / managed security providers (MSSPs, penetration testers, SOCs)? Malaysian businesses commonly buy both types of services — I’ve listed highly‑recommended firms in each category below with short notes and sources.

Physical security (guards, electronic security, facilities/facility management)

• G4S / Securitas (global security firms with presence/partnerships in Malaysia) — commonly used by large corporates for guarding and integrated services. (businesslist.my)
• UEM Edgenta (facility & asset management that provides security and hospital/estate security services for large Malaysian enterprises). (en.wikipedia.org)
• Local licensed security agencies (examples frequently used by Malaysian SMEs / property managers: 1 Security Services, Unity Force, Security Monitoring Center, ADC Security Technologies) — many local businesses prefer established local firms for guard services and CCTV/monitoring. (listings and local directories). (businesslist.my)

Cybersecurity / Managed Security & Consulting (for corporate IT security, SOC, IR, pen testing)

• Quann / Ensign InfoSecurity (regional MSSP with managed detection & response and experience in Malaysia). (Factosecure.com)
• LGMS (LE Global Services) — Malaysian firm known for pen testing, digital forensics and compliance work with enterprises/government. (Factosecure.com)
• Wizlynx (regional cybersecurity consultancy with Malaysia operations) — red team, compliance, consulting for banks/telcos. (qualysec.com)
• Nexagate / Securelytics / local MSSPs (regional managed security, SOC-as-a-service providers used by mid‑market firms). (Factosecure.com)
• Global integrators with local presence (NTT Ltd., Dimension Data/NTT, Kyndryl partners) — chosen by multinationals / large enterprises for scale and SOC services. (SmartOSC.com)

How to pick the right provider (short checklist Malaysian businesses use)

• Verify licensing/compliance: for physical guards, confirm licences under Malaysia’s Private Agency Act and local state approvals; for cyber vendors, check ISO 27001, SOC, or local PDPA compliance services. (globenewswire.com)
• Ask for industry references and a scope: retail/property needs differ from finance/healthcare (data residency, SOC availability, 24/7 IR). (linkedin.com)
• Request proof of outcomes: incident response times, sample SOC dashboard, pen test reports (redacted), and SLAs. (Factosecure.com)

If you want, I can:

• Provide a short, prioritized shortlist (3–5 vendors) tailored to your sector (e.g., banking, manufacturing, retail), or
• Produce contact/website details and up‑to‑date client references for any 3 vendors from the lists above.

Which type of security are you interested in (physical, cyber, or both) and what industry is your business in?