Do you mean cybersecurity companies (IT/managed security) or physical security firms (guard services, alarm/CCTV/installers)? I’ll list leading names in both categories in Malaysia and give quick notes on what they’re known for.

Top cybersecurity / IT security companies in Malaysia

• LGMS Berhad — One of Malaysia’s best-known homegrown cyber firms (penetration testing, DFIR, managed services); widely used by banks and large corporates and recognised by industry analysts. (businesstoday.com.my)
• Nexagate — Malaysian MSSP and security consulting firm (SOC-as-a-service, pen-test-as-a-service, ISO/PDPA compliance) with CREST and ISO credentials. (Nexagate.com)
• Wizlynx Group (Malaysia) — International security services provider active in Malaysia (red teaming, penetration testing) with regional licensing and CREST accreditations. (wizlynxgroup.com)
• Quann / Ensign (regional players operating in Malaysia) — Known for managed detection & response, analytics and enterprise security services (regional MSSP capability). (industry listings and regional provider presence). (factosecure.com)
• NTT / Dimension Data (Malaysia) — Global systems integrator/managed security services for large enterprises and cloud security projects. (factosecure.com)

Top physical-security / alarm & guarding companies in Malaysia

• Safeguards G4S (Safeguards / Safeguards G4S) — Long-established Malaysian security company (guarding, cash-in-transit, electronic systems); operates via Safeguards G4S subsidiaries across Malaysia. (safeguards.com.my)
• ADT (local ADT service providers / authorised partners in Malaysia) — International electronic alarm and monitoring brand with local installers/partners for home and SME alarm/CCTV/monitoring services. (jmbmalaysia.org)

How to pick the right company

• For cybersecurity (IT): look for relevant certifications (ISO 27001, CREST), incident-response capability (DFIR), SOC/MSSP presence, customer references in your industry, and data‑sovereignty/hosting options. (Nexagate.com)
• For physical security / alarm systems: check licences, local branch/response coverage, verified monitoring stations, proof-of-insurance, and client references. (businessreport.ctoscredit.com.my)

If you want, I can:

• Narrow recommendations to your city (Kuala Lumpur, Penang, Johor, etc.), or
• Provide providers that specialise in one sector (banks, manufacturing, healthcare), or
• Prepare a short RFP checklist you can use to evaluate bids.