62/100IFR Score
Ranked #1 because of its Google rating and service focus: 5.0★ from 40 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Best Cybersecurity Companies in London, ON (2026)
79 cybersecurity companies ranked by IFR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in London: Rhyno Cyber Security Services, IFR Score 62/100; 5.0★ from 40 Google reviews; open 7 days a week.
- 21
Most-reviewed: OnSite Computer Services, 276 Google reviews at 4.9★, the most of 79 ranked; ranked #21.
Rankings can't be bought. IT providers can't pay to change their rank or score. How we rank
79 London cybersecurity companies are ranked here by IFR Score, from nine published factors. 27 open Saturdays and 16 open Sundays, based on posted hours. The median Google rating is 5.0★ across 79 rated IT firms.
Top 10 cybersecurity companies in London at a glance
Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.
| Rank | Business | IFR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Rhyno Cyber Security Services | 62 | 5.0★ (40) | Kitchener, 79 km away | Sat · Sun · Evenings | Overall |
| 2 | MSP Corp (Formerly Stronghold I.T.) | 61 | 4.6★ (38) | London | — | — |
| 3 | North Shield Technology | 59 | 5.0★ (100) | London | Sat · Sun · Evenings | — |
| 4 | TCC Computers Inc. | 59 | 3.9★ (17) | Detroit, 12 km away | — | — |
| 5 | Personal Computers | 59 | 4.9★ (170) | London | Sat | — |
| 6 | USOC Inc | 59 | 4.8★ (13) | Kitchener, 80 km away | Sat · Sun · Evenings | — |
| 7 | Winfinite Consulting | Cybersecurity Consulting and Training Services | 59 | 5.0★ (59) | Hamilton, 119 km away | Sat | — |
| 8 | Arctic Wolf | 59 | 4.8★ (55) | Waterloo, 80 km away | Evenings | — |
| 9 | Digital Boundary Group | 58 | 4.8★ (17) | London | — | — |
| 10 | Smola Designs - Web Design, Logos, Marketing & More! | 57 | 5.0★ (114) | Kitchener, 77 km away | Sat · Sun · Evenings | — |
The 79 best cybersecurity companies in London, ranked
Ordered by IFR Score, a 0–100 score from nine published factors. Paid placement never changes the order.
Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.
Based in London
61/100IFR ScoreRanked #2 because of its Google rating and service focus: 4.6★ from 38 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in London
59/100IFR ScoreRanked #3 because of its Google rating and review volume: 5.0★ from 100 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
Based in Detroit, 12 km away
59/100IFR ScoreRanked #4 because of its Google rating and service focus: 3.9★ from 17 Google reviews, listed on Google as “Computer security service”.
Based on 7 of 9 factors; recency and availability not yet collected.
Based in London
59/100IFR ScoreRanked #5 because of its Google rating and review volume: 4.9★ from 170 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
#6 USOC Inc
Based in Kitchener, 80 km away
59/100IFR ScoreRanked #6 because of its Google rating and service focus: 4.8★ from 13 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Hamilton, 119 km away
59/100IFR ScoreRanked #7 because of its Google rating and service focus: 5.0★ from 59 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#8 Arctic Wolf
Based in Waterloo, 80 km away
59/100IFR ScoreRanked #8 because of its Google rating and service focus: 4.8★ from 55 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in London
58/100IFR ScoreRanked #9 because of its Google rating and service focus: 4.8★ from 17 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Kitchener, 77 km away
57/100IFR ScoreRanked #10 because of its Google rating and review volume: 5.0★ from 114 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
Based in London
57/100IFR ScoreRanked #11 because of its Google rating and service focus: 4.8★ from 12 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Waterloo, 83 km away
57/100IFR ScoreRanked #12 because of its Google rating and review volume: 4.9★ from 131 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
Based in London
57/100IFR ScoreRanked #13 because of its Google rating and service focus: 5.0★ from 9 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#14 eSentire Inc.
Based in Waterloo, 79 km away
57/100IFR ScoreRanked #14 because of its Google rating and service focus: 4.6★ from 43 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#15 DAGI
Based in London
57/100IFR ScoreRanked #15 because of its Google rating and service focus: 5.0★ from 9 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in London
56/100IFR ScoreRanked #16 because of its Google rating and service focus: 5.0★ from 6 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in London
56/100IFR ScoreRanked #17 because of its Google rating and service focus: 5.0★ from 30 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Ancaster, 108 km away
55/100IFR ScoreRanked #18 because of its Google rating and service focus: 5.0★ from 6 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#19 Outhouse IT
Based in Hamilton, 107 km away
55/100IFR ScoreRanked #19 because of its Google rating and service focus: 5.0★ from 27 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Guelph, 101 km away
55/100IFR ScoreRanked #20 because of its Google rating and review volume: 4.5★ from 140 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
Based in Kitchener, 77 km away
55/100IFR ScoreRanked #21 because of its Google rating and review volume: 4.9★ from 276 Google reviews, the most in London.
Based on 8 of 9 factors; recency not yet collected.
#22 Quadbridge
Based in Kitchener, 79 km away
55/100IFR ScoreRanked #22 because of its Google rating and service focus: 4.1★ from 23 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Cambridge, 84 km away
55/100IFR ScoreRanked #23 because of its Google rating and service focus: 4.9★ from 17 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#24 IT SOLUTION GUY
Based in St. Thomas, 24 km away
55/100IFR ScoreRanked #24 because of its Google rating and service focus: 3.7★ from 3 Google reviews, listed on Google as “Computer security service”.
Based on 7 of 9 factors; recency and availability not yet collected.
#25 ITCP
Based in Kitchener, 84 km away
55/100IFR ScoreRanked #25 because of its Google rating and service focus: 5.0★ from 9 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Cybersecurity companies ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in IFR Score order; each links to its profile. We publish the top 50 of 79 ranked cybersecurity companies here; the rest are on their profiles.
| Rank | Business | IFR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Infinity Network Solutions | 55 | 4.3★ (4) | In London |
| 27 | ClayGen Consulting Inc. | 54 | 5.0★ (17) | 99 km |
| 28 | IT Solutions Canada Inc. | 54 | 5.0★ (5) | 98 km |
| 29 | EliteSec Information Security Consultants | 54 | 5.0★ (12) | 79 km |
| 30 | Snownet | 54 | 5.0★ (3) | 71 km |
| 31 | Solnet Canada | 54 | 5.0★ (11) | In London |
| 32 | Compudata Systems | 54 | 4.9★ (51) | In London |
| 33 | Nide Networks | 53 | 5.0★ (5) | 81 km |
| 34 | RavenSoft Microsystems Inc. | 53 | 5.0★ (26) | In London |
| 35 | Geeks Worldwide Solutions | 52 | 4.6★ (45) | In London |
| 36 | Red Alert IT Solutions | 52 | 4.7★ (12) | 118 km |
| 37 | Focus Computers Inc | 52 | 4.8★ (55) | 61 km |
| 38 | Hammer Software | 51 | 5.0★ (8) | 115 km |
| 39 | NetFusion Designs | 51 | 5.0★ (17) | 80 km |
| 40 | ISARA Corporation | 51 | 4.0★ (5) | 78 km |
| 41 | CyberBadger | 51 | 5.0★ (8) | 112 km |
| 42 | OnSite Computer Services. | 51 | 4.9★ (79) | 80 km |
| 43 | Vanguard International Ltd | 51 | 4.0★ (4) | 78 km |
| 44 | Western IT Group Inc | 51 | 4.8★ (24) | In London |
| 45 | Allied Universal® Security Services | 51 | 3.1★ (23) | 115 km |
| 46 | Daltech Computers | 51 | 5.0★ (23) | 109 km |
| 47 | camoIT Solutions Inc. | 51 | 5.0★ (15) | 87 km |
| 48 | SecurIBC (IBC Computers Brantford) | 50 | 4.2★ (83) | 80 km |
| 49 | ISN Computer Solutions (A Division of Websecure Technologies) | 50 | 4.8★ (48) | 94 km |
| 50 | Total-Teck | 50 | 5.0★ (19) | In London |
Also serving London
20 more cybersecurity companies within 121 km that we can't rank yet: too few reviews, or a service we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| ACE I.T. Canada | 5.0★ (70) | In London |
| Ace Unlimited Technologies Inc | 5.0★ (16) | In London |
| AlphaKOR - Managed IT Services Company London | 5.0★ (1) | In London |
| Asurtec Solutions | 4.0★ (4) | In London |
| Attache Group Inc | 5.0★ (33) | In London |
| Centra Cyber Security | 5.0★ (2) | In London |
| Consys Group Inc. | 4.9★ (35) | In London |
| CUNDware | 5.0★ (1) | In London |
| CVN Managed Services | 5.0★ (4) | In London |
| DigiWire IT Solutions | In London | |
| HHH I.T Solutions Inc. | 5.0★ (1) | In London |
| Intuitive IT | 5.0★ (6) | In London |
| Labyrinth Computer Forensics Inc. | In London | |
| ManagePoint Technologies | 5.0★ (69) | In London |
| Nerds On Site | 4.8★ (1,313) | In London |
| Next Dimension Inc. | 4.3★ (6) | In London |
| SECUREVU I.T. | 4.6★ (58) | In London |
| Softchoice Solutions Canada | 5.0★ (4) | In London |
| Techdoz | 5.0★ (9) | In London |
| Tikom Technologies | 5.0★ (24) | In London |
How we ranked London cybersecurity companies
We scored 79 London cybersecurity companies on nine factors, weighted as shown. An IT firm is ranked when its service is confirmed and it has 3 or more Google reviews or a claimed profile. An IT firm with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 9, 2026.
Paid placement never changes a rank or score. Sponsored businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In London data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Review volume | 15% | Number of Google reviews, compared with the most-reviewed IT firm on the list | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday and 24/7 support | Measured |
| Service focus | 15% | How clearly the firm does this service (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The firm has claimed its IT Firms Ranked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The firm links to IT Firms Ranked from its own website with our badge, checked periodically | Measured |
| Client reviews | 10% | Verified client reviews collected by IT Firms Ranked: their rating and how many there are | Measured |
How to choose a cybersecurity company
- Ask whether monitoring is staffed around the clock by the firm itself or by a partner.
- Ask for a sample assessment or penetration-test report with client details removed.
- Check experience with your industry’s rules (for example HIPAA, PCI DSS or CMMC).
- Ask what the firm does in the first hour of an incident, and whether that is in the contract.
- Ask for two or three references from clients of your size and industry, and call them.
- Get the scope, response times and price in writing before you sign, including how you leave and get your data back.
Questions to ask a cybersecurity company
- Is your security monitoring staffed 24/7, and by whom?
- Which frameworks do you assess against?
- What do your reports include, and do you re-test after we fix the findings?
- Do you handle incident response yourselves, and do you work with cyber insurers?
- What access will you need to our systems, and how is it controlled and logged?
- Which certifications do the people doing the work hold?
Terms explained
- MSP (managed service provider)
- A firm that runs a business’s IT for a recurring fee: monitoring, patching, help desk, backups and security tools.
- Co-managed IT
- An arrangement where an outside firm supports an in-house IT person or team, sharing tools and tasks.
- Break-fix
- IT support paid per incident or per hour, with no monthly agreement.
- SLA (service-level agreement)
- The contract terms for response and resolution times, uptime and support hours.
- Help desk
- The support line staff call or email for IT problems.
- RMM
- Remote monitoring and management software that lets an IT firm watch, patch and fix computers remotely.
- vCIO
- A virtual chief information officer: part-time IT strategy and budgeting from an outside firm.
- MSSP
- A managed security service provider: a firm that monitors and manages security tools around the clock.
- EDR / MDR
- Endpoint detection and response software, and the managed service of people watching its alerts (managed detection and response).
- MFA
- Multi-factor authentication: a second proof of identity, such as an app prompt, on top of a password.
- Penetration test
- An authorised, simulated attack on your systems to find weaknesses before criminals do.
- SOC 2
- An independent auditor’s report (AICPA standard) on a service provider’s security controls.
Cybersecurity companies in London: frequently asked questions
Who is the best cybersecurity company in London?
By IFR Score, the highest-ranked cybersecurity company in London, ON is Rhyno Cyber Security Services with an IFR Score of 62/100. It has 5.0★ from 40 Google reviews. It is open 7 days a week. MSP Corp (Formerly Stronghold I.T.) (#2) and North Shield Technology (#3) follow. We ranked 79 cybersecurity companies on nine factors, last updated November 9, 2026.
How many cybersecurity companies are there in London?
ITFirmsRanked ranks 79 cybersecurity companies serving London, ON. 16 of them are based in London; the rest serve it from nearby towns. Another 20 within 121 km are listed but not ranked yet. Counts are as of November 2026.
Which cybersecurity companies in London work on weekends?
27 of 79 ranked cybersecurity companies post Saturday hours and 16 post Sunday hours. The highest-ranked open Saturdays are Rhyno Cyber Security Services (#1), North Shield Technology (#3) and Personal Computers (#5). Posted hours are office hours; many firms also run an after-hours support line for contract clients.
What Google rating do London cybersecurity companies have?
The median Google rating among 79 rated cybersecurity companies in London is 5.0★, with a median of 17 reviews. OnSite Computer Services has the most, 276 reviews, and ranks #21. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ITFirmsRanked rank cybersecurity companies?
Each cybersecurity company gets a 0–100 IFR Score from nine published factors, led by reputation (25%), review volume (15%), service focus (15%) and recency (10%). An IT firm with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only IT firms with a confirmed service and 3 or more reviews, or a claimed profile, are ranked.
Do cybersecurity companies outside London count in this ranking?
Yes, if they are within 121 km of the London city centre, our service radius for cybersecurity companies. Each listing shows where the IT firm is based and how far away it is. Proximity is 5% of the IFR Score, so a nearby IT firm gets a small edge.
Can cybersecurity companies pay to rank higher on ITFirmsRanked?
No. The IFR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured IT firms may appear above the list, labelled Sponsored and showing their honest rank.
What does a cybersecurity company do?
Cybersecurity companies assess and protect a business’s systems and data: security monitoring, endpoint protection, penetration testing, compliance support and incident response.
How are cybersecurity companies in London ranked?
By IFR Score: Google rating and review volume, recent reviews, opening hours, how clearly the firm does cybersecurity, distance, a claimed profile, our badge and verified client reviews. Sponsored placements never change the order.
Do we need a cybersecurity firm if we already have an IT provider?
Sometimes. Many IT providers include basic security tools; a security firm adds specialist work such as 24/7 monitoring, penetration tests, compliance audits and incident response. Ask your IT provider what they cover and where they would bring in a specialist.
What is the difference between a security assessment and a penetration test?
An assessment reviews your policies, settings and controls against a framework. A penetration test is an authorised, simulated attack that tries to exploit weaknesses. Both end with a written report and a list of fixes.
Can a cybersecurity firm help with compliance?
Many help organisations prepare for requirements such as HIPAA, PCI DSS, CMMC or SOC 2. They can advise and assess, but only an independent auditor issues a SOC 2 report, and compliance is ultimately your responsibility.
Update log for London
- November 2026: IFR Scores recalculated for 79 cybersecurity companies serving London.
More cybersecurity companies and London pages
Cybersecurity companies near London
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