UK’s trusted IT infrastructure partner since 2003
sales@servnetuk.com
0800 987 4111
Servnet
ConfiguratorGet in Touch
Security migration
From
Symantec / Broadcom SEP
→
To
SentinelOne Singularity

Symantec to SentinelOne migration — UK endpoint security refresh

Symantec Endpoint Protection (under Broadcom since 2019) has seen meaningful price increases and feature stagnation. SentinelOne Singularity is the most-evaluated modern EDR destination — best-in-class autonomous response (kill + quarantine + rollback without human intervention), best-in-class MITRE coverage. Servnet runs end-to-end SEP → SentinelOne migrations including co-existence wave and mass rollout.

Vendor migration programme — Symantec / Broadcom SEP source on the left, SentinelOne Singularity target on the right, with parallel-running data streams converging through a central Servnet cutover hub.
From → To: Symantec / Broadcom SEP vs SentinelOne Singularity
CURRENTSymantec / Broadcom SEPProduction workloadsLegacy management planeRenewal due / EoSServnetparallel-running migrationTARGETSentinelOne SingularityProduction workloadsModern management planeStrategic 5-yr position
Typical outcomes

What good looks like after a Symantec / Broadcom SEP → SentinelOne Singularity migration

Detection uplift
×4-6

Typical uplift on MITRE evaluations vs signature-based SEP.

Migration window
6-10 wk

End-to-end for a 500-5,000 endpoint estate.

Endpoint footprint
−75%

SentinelOne agent ~35MB RAM vs SEP + add-ons ~150MB+.

Infrastructure removed
2-4 VMs

SEPM + SQL backend + content distribution all decommissioned.

The why

Why UK organisations migrate from Symantec / Broadcom SEP to SentinelOne Singularity

  • ✓Move from signature-based AV to behavioural EDR with autonomous response
  • ✓Best-in-class MITRE ATT&CK coverage (consistently top-ranked alongside CrowdStrike)
  • ✓Autonomous quarantine + ransomware rollback — kills attacks without analyst intervention
  • ✓Single lightweight cloud-managed agent vs Symantec's on-prem SEPM + SQL backend
  • ✓Optional Vigilance MDR for 24×7 SOC outsourced to SentinelOne
  • ✓Often more cost-effective than CrowdStrike at similar capability — typical 15-25% lower per-endpoint price
How we run it

Migration phasing — typical Symantec / Broadcom SEP → SentinelOne Singularity programme

Symantec / Broadcom SEP → SentinelOne Singularity — programme timeline
W0W2W4W6W8W10Discovery + sizing1wSentinelOne tenant setup1wPilot ring (5% of estate)2wCo-existence mass rollout3wSEP uninstall + decommission3wTotal programme: 10 weeks · parallel running throughout
  1. 1

    Discovery + sizing

    Week 1

    Endpoint estate fingerprint; SentinelOne licensing sizing (Core, Control, Complete); Vigilance MDR sizing if applicable; AD / Entra ID / SIEM integration design.

  2. 2

    SentinelOne tenant setup

    Week 2

    Singularity tenant configured; policies + exclusion lists + groups; sensor packages staged; AD + SIEM + ITSM integration.

  3. 3

    Pilot ring (5% of estate)

    Weeks 3-4

    SentinelOne co-existing with SEP on pilot endpoints; performance validation; autonomous response policies tuned (kill / quarantine / rollback thresholds).

  4. 4

    Co-existence mass rollout

    Weeks 5-7

    Phased rollout with both agents running; helpdesk monitoring; daily reviews.

  5. 5

    SEP uninstall + decommission

    Weeks 8-10

    SEP removed per-wave; SEPM + SQL backend decommissioned; SentinelOne operational handover.

Included in scope

What Servnet delivers in a Symantec / Broadcom SEP → SentinelOne Singularity migration

SentinelOne tenant + sensor packaging

Pre-staged sensors via Intune / SCCM / Group Policy / Jamf.

AD / Entra ID + SIEM integration

Role-based access, MFA-enforced admin, alert forwarding into your SIEM.

Autonomous response policy tuning

Kill / quarantine / rollback thresholds tuned per workload class — server vs workstation vs Tier-0.

Co-existence wave plan

Detailed wave plan with helpdesk capacity sizing, rollback triggers, daily reviews.

SEP removal tooling

Validated Symantec removal scripts; manual remediation for edge cases.

Post-migration support

90-day hypercare; optional ongoing managed SentinelOne service or Vigilance handover.

De-risking the cutover

Top risks + how we mitigate them

⚠️ Autonomous response kills a legitimate business application
Autonomous response disabled in pilot ring; carefully tuned per wave with explicit allow-lists for known business applications. Mass rollout only after autonomous response is validated against your application portfolio.
⚠️ Two agents degrade endpoint performance
SentinelOne + SEP co-existence is documented and resource-light. Pilot ring monitors for regression.
⚠️ SEP uninstall fails on some endpoints
Validated removal scripts handle 95%+; edge cases get manual remediation. SEP residual presence tracked until 100% clean.
⚠️ CISO wants comparable feature parity with previous CrowdStrike POC
SentinelOne and CrowdStrike are functionally similar at the capability level. We document the feature mapping during discovery so the CISO has the comparison they need.
Pricing guide rail

Indicative: Symantec → SentinelOne migrations for a 500-5,000 endpoint estate typically run £12k-£35k professional services (excluding SentinelOne licensing). SentinelOne licensing typically £50-£95 per endpoint per year depending on tier. Total programme often favourable vs Symantec renewal — typically 20-30% lower 3-year cost. Talk to us for a sized commercial proposal.

Frequently asked

FAQs — Symantec / Broadcom SEP → SentinelOne Singularity

Should we choose SentinelOne or CrowdStrike?

Both are best-in-class. SentinelOne is typically more cost-effective and stronger at autonomous response; CrowdStrike has the deeper MDR offering with Falcon Complete. Our EDR choice framework covers the trade-offs in detail.

What about Microsoft Defender for Endpoint?

If you're on M365 E5, Defender is included — meaningful cost saving. Capability is competitive for most enterprises. See our 2026 EDR buyer's guide for the full compare.

Does SentinelOne actually roll back ransomware?

Yes — for Windows, when ransomware encrypts files SentinelOne can roll back to pre-encryption state via Volume Shadow Copy integration + its own behavioural snapshots. Demonstrated repeatedly in lab + production. Worth seeing demoed during evaluation.

Can we keep SEP on legacy / unsupported endpoints?

Yes — many migrations keep SEP active on a small residual estate of legacy / EoL endpoints that SentinelOne doesn't cover (e.g. very old Windows Server, IoT devices). We document the residual scope and the operational implications.

Go deeper

Ready to scope your Symantec / Broadcom SEP → SentinelOne Singularity migration?

30-minute discovery call with an engineer who's run this migration before. Honest scoping, no sales script.

Book a scoping call →