66/100IFR Score
Ranked #1 because of its Google rating and service focus: 5.0★ from 389 Google reviews, listed on Google as “Computer security service”.
Best Cybersecurity Companies in Corona, CA (2026)
563 cybersecurity companies ranked by IFR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Corona: KME Systems, IFR Score 66/100; 5.0★ from 389 Google reviews.
- 9
Most-reviewed: Sam's IT Solutions, 497 Google reviews at 5.0★, the most of 563 ranked; ranked #9.
Rankings can't be bought. IT providers can't pay to change their rank or score. How we rank
563 Corona cybersecurity companies are ranked here by IFR Score, from nine published factors. 199 open Saturdays and 135 open Sundays, based on posted hours. The median Google rating is 5.0★ across 563 rated IT firms.
Top 10 cybersecurity companies in Corona 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 | KME Systems | 66 | 5.0★ (389) | Irvine, 19 mi away | — | Overall |
| 2 | Buzz Cybersecurity - Irvine Managed IT Services | 64 | 4.8★ (72) | Irvine, 23 mi away | Sat · Sun · Evenings | — |
| 3 | The Bodyguard Group of Beverly Hills | 64 | 5.0★ (107) | Beverly Hills, 49 mi away | Sat · Sun · Evenings | — |
| 4 | Intelecis - Cyber Security Company in California, IT support Company In California | 63 | 5.0★ (36) | Fullerton, 21 mi away | Sat · Sun · Evenings | — |
| 5 | Enterprise Guardian Inc. | 62 | 4.8★ (183) | Costa Mesa, 23 mi away | — | — |
| 6 | TechWaste Recycling Inc. | 62 | 4.7★ (172) | Santa Ana, 19 mi away | — | — |
| 7 | Intelecis IT Support & Cybersecurity Company | 61 | 5.0★ (25) | Long Beach, 36 mi away | Sat · Sun · Evenings | — |
| 8 | Intelecis Cyber Security Company Irvine | 61 | 5.0★ (87) | Irvine, 17 mi away | Sat · Sun · Evenings | — |
| 9 | Sam's IT Solutions | 61 | 5.0★ (497) | Pasadena, 38 mi away | Sat · Sun · Evenings | Most reviews |
| 10 | Methodology IT | 61 | 5.0★ (158) | Los Angeles, 48 mi away | — | — |
The 563 best cybersecurity companies in Corona, 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.
Scores below: based on 8 of 9 factors; recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Irvine, 23 mi away
64/100IFR ScoreRanked #2 because of its Google rating and service focus: 4.8★ from 72 Google reviews, listed on Google as “Computer security service”.
Based in Beverly Hills, 49 mi away
64/100IFR ScoreRanked #3 because of its Google rating and service focus: 5.0★ from 107 Google reviews, listed on Google as “Computer security service”.
Based in Fullerton, 21 mi away
63/100IFR ScoreRanked #4 because of its Google rating and service focus: 5.0★ from 36 Google reviews, listed on Google as “Computer security service”.
Based in Costa Mesa, 23 mi away
62/100IFR ScoreRanked #5 because of its Google rating and service focus: 4.8★ from 183 Google reviews, listed on Google as “Computer security service”.
Based in Santa Ana, 19 mi away
62/100IFR ScoreRanked #6 because of its Google rating and service focus: 4.7★ from 172 Google reviews, listed on Google as “Computer security service”.
Based in Long Beach, 36 mi away
61/100IFR ScoreRanked #7 because of its Google rating and service focus: 5.0★ from 25 Google reviews, listed on Google as “Computer security service”.
Based in Irvine, 17 mi away
61/100IFR ScoreRanked #8 because of its Google rating and review volume: 5.0★ from 87 Google reviews.
Based in Pasadena, 38 mi away
61/100IFR ScoreRanked #9 because of its Google rating and review volume: 5.0★ from 497 Google reviews, the most in Corona.
#10 Methodology IT
Based in Los Angeles, 48 mi away
61/100IFR ScoreRanked #10 because of its Google rating and service focus: 5.0★ from 158 Google reviews, listed on Google as “Computer security service”.
Based in Huntington Beach, 29 mi away
61/100IFR ScoreRanked #11 because of its Google rating and service focus: 5.0★ from 19 Google reviews, listed on Google as “Computer security service”.
#12 Alvaka
Based in Irvine, 21 mi away
61/100IFR ScoreRanked #12 because of its Google rating and service focus: 4.9★ from 15 Google reviews, listed on Google as “Computer security service”.
#13 QLAN
Based in Irvine, 18 mi away
61/100IFR ScoreRanked #13 because of its Google rating and service focus: 5.0★ from 64 Google reviews, listed on Google as “Computer security service”.
Based in Tustin, 18 mi away
61/100IFR ScoreRanked #14 because of its Google rating and service focus: 5.0★ from 75 Google reviews, listed on Google as “Computer support and services”.
Based in Los Angeles, 48 mi away
60/100IFR ScoreRanked #15 because of its Google rating and service focus: 4.8★ from 31 Google reviews, listed on Google as “Computer security service”.
Based in Irvine, 21 mi away
59/100IFR ScoreRanked #16 because of its Google rating and review volume: 5.0★ from 174 Google reviews.
Based in Long Beach, 33 mi away
59/100IFR ScoreRanked #17 because of its Google rating and service focus: 4.6★ from 28 Google reviews, listed on Google as “Computer security service”.
Based in Hawthorne, 46 mi away
59/100IFR ScoreRanked #18 because of its Google rating and service focus: 4.8★ from 19 Google reviews, listed on Google as “Computer security service”.
Based in Irvine, 21 mi away
59/100IFR ScoreRanked #19 because of its Google rating and service focus: 5.0★ from 8 Google reviews, listed on Google as “Computer security service”.
Based in Corona
59/100IFR ScoreRanked #20 because of its Google rating and service focus: 5.0★ from 4 Google reviews, listed on Google as “Computer security service”.
Based in Anaheim, 10 mi away
59/100IFR ScoreRanked #21 because of its Google rating and service focus: 4.0★ from 7 Google reviews, listed on Google as “Computer security service”.
#22 TeamLogic IT
Based in Rancho Cucamonga, 16 mi away
59/100IFR ScoreRanked #22 because of its Google rating and service focus: 5.0★ from 31 Google reviews, listed on Google as “Computer security service”.
#23 SecLex
Based in Riverside, 11 mi away
58/100IFR ScoreRanked #23 because of its Google rating and service focus: 5.0★ from 4 Google reviews, listed on Google as “Computer security service”.
#24 Tech Expert Guys
Based in Irvine, 20 mi away
58/100IFR ScoreRanked #24 because of its Google rating and review volume: 4.9★ from 241 Google reviews.
Based in Mission Viejo, 19 mi away
58/100IFR ScoreRanked #25 because of its Google rating and service focus: 5.0★ from 5 Google reviews, listed on Google as “Computer security service”.
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 563 ranked cybersecurity companies here; the rest are on their profiles.
Also serving Corona
20 more cybersecurity companies within 75 mi that we can't rank yet: too few reviews, or a service we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Acutech Network Services | 3.0★ (2) | 17 mi |
| Alchemy Computer Services | 5.0★ (2) | 17 mi |
| Alpha Computers, Inc. | 4.9★ (74) | In Corona |
| ArcherPoint, LLC | In Corona | |
| Creative Business Technologies | In Corona | |
| Dataprise | In Corona | |
| FlexTG Los Angeles | 5.0★ (2) | 14 mi |
| Forum Info-Tech | 5.0★ (173) | In Corona |
| Geeks on Site | In Corona | |
| Hyuntec Industries - Affordable Computer Repair | 5.0★ (2) | 17 mi |
| InfoTech Management | 4.9★ (34) | In Corona |
| IT Center of Southern California | In Corona | |
| IT Vizion | 5.0★ (2) | In Corona |
| Keen IT Services | 4.3★ (12) | In Corona |
| Kortech, Inc. | 5.0★ (1) | In Corona |
| LevelCloud | In Corona | |
| Nevtis Communications | 5.0★ (36) | In Corona |
| PCtronics | IT Services & Managed IT Solutions | In Corona | |
| Pettit Consulting | 5.0★ (2) | 14 mi |
| Techie Networks Inc | 5.0★ (2) | 12 mi |
How we ranked Corona cybersecurity companies
We scored 563 Corona 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 Corona 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 Corona: frequently asked questions
Who is the best cybersecurity company in Corona?
By IFR Score, the highest-ranked cybersecurity company in Corona, CA is KME Systems with an IFR Score of 66/100. It has 5.0★ from 389 Google reviews. Buzz Cybersecurity - Irvine Managed IT Services (#2) and The Bodyguard Group of Beverly Hills (#3) follow. We ranked 563 cybersecurity companies on nine factors, last updated November 9, 2026.
How many cybersecurity companies are there in Corona?
ITFirmsRanked ranks 563 cybersecurity companies serving Corona, CA. 2 of them are based in Corona; the rest serve it from nearby towns. Another 20 within 75 mi are listed but not ranked yet. Counts are as of November 2026.
Which cybersecurity companies in Corona work on weekends?
199 of 563 ranked cybersecurity companies post Saturday hours and 135 post Sunday hours. The highest-ranked open Saturdays are Buzz Cybersecurity - Irvine Managed IT Services (#2), The Bodyguard Group of Beverly Hills (#3) and Intelecis - Cyber Security Company in California, IT support Company In California (#4). Posted hours are office hours; many firms also run an after-hours support line for contract clients.
What Google rating do Corona cybersecurity companies have?
The median Google rating among 563 rated cybersecurity companies in Corona is 5.0★, with a median of 14 reviews. Sam's IT Solutions has the most, 497 reviews, and ranks #9. 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 Corona count in this ranking?
Yes, if they are within 75 mi of the Corona city center, 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 Corona 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 Corona
- November 2026: IFR Scores recalculated for 563 cybersecurity companies serving Corona.
- November 2026: 5 duplicate listings merged.
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