When planning your move,
Accenture and
Rackspace Technology stand out as top choices. Accenture excels at large scale enterprise transformations and complex multi cloud strategies, while Rackspace Technology is better suited for businesses seeking dedicated managed support and rapid infrastructure optimization.
Top 10 Cloud Migration Agencies, compared| RANK | ENTRY | BEST FOR | SCORE | FROM |
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| 1 |  AccentureAccenture is a Fortune Global 500 company and partners with all major hyperscalers. | Forbes Global 2000 companies and government bodies handing over a whole function on a longer-term contract, particularly where one supplier needs to run finance, procurement, HR and IT operations across many countries at the same time. | 95.0 | – |
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| 2 |  Rackspace TechnologyRackspace originally pioneered the OpenStack cloud computing platform. | Managed cloud support and optimization | 92.7 | Custom |
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| 3 |  SlalomSlalom operates through a localized delivery model with offices across multiple continents. | Mid market and agile migrations | 90.3 | Custom |
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| 4 |  CognizantCognizant is consistently ranked in the Fortune 200 list of large companies. | Large enterprises handing an entire operational function to an outside vendor, particularly healthcare payers, providers and pharmacy benefit managers moving claims, enrolment and revenue cycle work off their own books. | 88.0 | – |
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| 5 |  CapgeminiCapgemini employs over three hundred thousand people across more than fifty countries. | European enterprise migrations | 85.7 | Custom |
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| 6 |  SoftServeSoftServe holds premier partner status with both Amazon Web Services and Google Cloud. | Software and tech product companies | 83.3 | Custom |
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| 7 |  1Strategy1Strategy is an Advanced Consulting Partner within the Amazon Web Services Partner Network. | Exclusive AWS migrations | 81.0 | Custom |
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| 8 |  CloudaAppsThe agency focuses heavily on Kubernetes and Docker container adoption. | Web application containerization | 78.7 | Custom |
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| 9 |  BigoBigo focuses exclusively on high-complexity legacy system migrations for financial services. | Enterprise multi-cloud architecture | 76.3 | Custom |
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| 10 |  10th Magnitude10th Magnitude was acquired by Reply, expanding its global European and North American delivery footprint. | Azure-centric transformations | 74.0 | Custom |
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How to choose
Start from what you need it for. Where each entry fits best:
- Accenture (#1): Forbes Global 2000 companies and government bodies handing over a whole function on a longer-term contract, particularly where one supplier needs to run finance, procurement, HR and IT operations across many countries at the same time.
- Rackspace Technology (#2): Managed cloud support and optimization
- Slalom (#3): Mid market and agile migrations
- Cognizant (#4): Large enterprises handing an entire operational function to an outside vendor, particularly healthcare payers, providers and pharmacy benefit managers moving claims, enrolment and revenue cycle work off their own books.
- Capgemini (#5): European enterprise migrations
- SoftServe (#6): Software and tech product companies
- 1Strategy (#7): Exclusive AWS migrations
- CloudaApps (#8): Web application containerization
- Bigo (#9): Enterprise multi-cloud architecture
- 10th Magnitude (#10): Azure-centric transformations
Each entry's full verdict is below.
The ranking, in detail
01
Runs finance, HR, procurement and IT for large firms
A global professional services company with leading capabilities in digital, cloud, and security, offering large scale cloud migration strategies for Fortune 500 enterprises.
Best for: Forbes Global 2000 companies and government bodies handing over a whole function on a longer-term contract, particularly where one supplier needs to run finance, procurement, HR and IT operations across many countries at the same time.
PROS- Managed services is close to half of Accenture's revenue ($34.57bn of a $69.67bn total in the year to 31 August 2025) and grew 9% against 6% for consulting, so it is a core business rather than a side offering of a consulting firm
- Breadth under one supplier: finance operations, sourcing and procurement, talent and HR, customer service, supply chain, risk and compliance, plus application, infrastructure, data and cybersecurity managed services all sit in the same practice, serving clients in more than 120 countries from offices and operations in 52
CONS- Nothing about the commercial terms is public and the account base is long settled. Accenture publishes no rate card, price or minimum engagement size on its managed services pages or in its 10-K, its revenue is derived primarily from Forbes Global 2000 companies and governments, and 195 of its top 200 clients have been with it for 10 or more years. A smaller or first-time buyer cannot size the cost before contacting sales, and sits well outside that core.
95.0
02
A leading end to end multicloud technology services company that helps businesses design, build, and operate their cloud environments across all major platforms.
From CustomBest for: Managed cloud support and optimization
PROS- Strong multi cloud expertise
- Reliable 24/7 managed support
CONS- Complex pricing structures
92.7
03
A modern consulting firm focused on strategy, technology, and business transformation, helping organizations move workloads smoothly to AWS, Azure, and Google Cloud.
From CustomBest for: Mid market and agile migrations
PROS- Collaborative company culture
- Tailored migration roadmaps
CONS- Smaller global footprint than tier one giants
90.3
04
Whole operational functions run for large enterprises
An information technology services corporation that provides digital transformation services, including large scale cloud adoption and legacy modernization.
Best for: Large enterprises handing an entire operational function to an outside vendor, particularly healthcare payers, providers and pharmacy benefit managers moving claims, enrolment and revenue cycle work off their own books.
PROS- Sells the running of complete functions, not project staffing, and says so plainly in its own copy: the healthcare page offers "Outsource your revenue cycle management (RCM) services" in full-cycle, front-end, middle-office and back-office variants, and the mortgage line describes Cognizant as "your AI-powered, NMLS licensed mortgage outsourcer". The business operations page carries 10 enterprise service lines and 13 industry ones.
- Its recognitions are named, dated third-party assessments rather than self-declarations: Leader in NelsonHall's F&A Transformation NEAT 2026, Leader in Everest Group's Marketing Transformation Services PEAK Matrix 2026, and Leader in the 2025 ISG Provider Lens for Finance and Accounting Outsourcing. Client work is named too, including MetroHealth, where Cognizant reports an 8% productivity improvement, a 25% increase in collection and a 30% drop in denial rates using its TriZetto Advanced Reimbursement Manager tool.
CONS- No pricing and no minimum engagement is published on any service page, and the headline outcome figures on the business operations page (600% faster claims processing, $900M cost savings, 8X ROI through intelligent automation) sit under the heading "Some of the results we've delivered" with no client, no baseline and no time period attached, so a buyer cannot size or benchmark those specific claims without entering an RFP.
88.0
05
A multinational information technology services and consulting company offering robust cloud migration, data analytics, and digital transformation solutions.
From CustomBest for: European enterprise migrations
PROS- Strong European market presence
- End to end service delivery
CONS- Bureaucratic project management
85.7
06
A digital authority and consulting company advising and providing at the cutting edge of technology, specializing in cloud engineering and big data.
From CustomBest for: Software and tech product companies
PROS- Deep software engineering roots
- Agile and responsive teams
CONS- Less focus on non tech traditional sectors
83.3
07
An AWS consulting partner specializing exclusively in Amazon Web Services migration, architecture, and cost optimization.
From CustomBest for: Exclusive AWS migrations
PROS- Deep specialized AWS knowledge
- Focused cost optimization strategies
CONS- Does not support multi cloud strategies
81.0
08
A cloud migration specialist providing seamless transition services and application modernization for modern web applications.
From CustomBest for: Web application containerization
PROS- Expertise in modern container tech
- Rapid deployment cycles
CONS- Narrower scope outside application hosting
78.7
09
A specialist cloud migration and DevOps consultancy assisting enterprises with complex AWS and Azure transformations.
From CustomBest for: Enterprise multi-cloud architecture
PROS- Deep technical expertise
- Dedicated project management
CONS- High cost for smaller projects
76.3
10
An agile cloud services provider focused entirely on Microsoft Azure migrations, modern application development and data analytics.
From CustomBest for: Azure-centric transformations
PROS- Strong Microsoft partnership
- Skilled DevOps engineers
CONS- Limited depth outside the Azure ecosystem
74.0
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Frequently asked questions
What does a cloud migration agency do?
A cloud migration agency assesses your current IT infrastructure, plans a secure transition strategy, moves your data and applications to platforms like AWS or Azure, and often provides ongoing managed services.
How much does a cloud migration project cost?
Costs vary significantly depending on the volume of data, complexity of applications, and choice of agency. Most enterprise agencies offer custom pricing based on an initial discovery audit.
How long does a typical cloud migration take?
A migration can take anywhere from a few weeks for small businesses to several years for large multinational enterprises with complex legacy systems.
Sources
Where we checked each company's facts, and when.