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Business consultants know that good strategy starts with good data. Whether you’re advising on market entry, growth opportunities, or competitive positioning, clients expect your recommendations to be grounded in reliable market size and competitor data. But finding trustworthy sources isn’t always straightforward.
Poor-quality or incomplete data can misguide strategy, erode trust, and ultimately cost your clients money. This becomes even more critical as consultants adopt more AI-powered tools. Reliable, credible data isn’t just fuel for analysis—it’s also what ensures AI-generated insights are accurate, relevant, and actionable.
In this guide, we’ll cover:
Why unreliable data can derail strategic decision-making and AI-driven insights
How to evaluate the credibility of third-party data providers
The most trusted types of market size and competitor data sources
How to learn more about credible data and AI
When consultants use flawed or incomplete data to advise clients, the impact goes beyond a single bad chart. It can ripple across strategic initiatives—and if the flawed data is fueling your GenAI models, it can scale bad decisions at lightning speed.
Bottom line: Garbage in, garbage out. If you're feeding your analysis with poor data, your consulting research will suffer.
Every client engagement is an opportunity to demonstrate expertise. To succeed, you need trusted, verifiable data sources that can power both human analysis and AI systems.
Download the Credible AI Toolkit
Market size and competitor data can come from multiple sources—free and paid. Regardless of where you get data (and how much you pay for it), it should be accurate, up-to-date, and trustworthy. If you're planning to incorporate third party data in your in-house AI models, it also needs to be structured appropriately and licensed for generative AI usage. Below are a checklist of criteria to use when evaluating third party data partners:
Breadth of sources: Look for providers that pull from a variety of global, reputable outlets—financial reports, regulatory filings, industry publications, and verified company data.
Data volume and timeliness: Reliable market size estimates require both historical depth and up-to-date signals to identify emerging trends.
Data enrichment and structure: Metadata such as industry tags, geographic segmentation, and sentiment analysis improves usability and insight extraction for both consultants and AI models.
Transparency in methodology: Ethical third-party providers should explain how data is aggregated, cleaned, and validated. If they can’t show their process, that’s a red flag.
Consistency and accuracy: Trusted data providers offer mechanisms to reduce duplication, filter out errors, and cross-reference multiple sources.
Where do consultants find reliable market size and competitor data? The most effective strategies combine multiple categories of sources:
Market research firms: Providers such as Gartner, Forrester, or IDC deliver in-depth reports on industry growth and competitive landscapes.
Financial and company data: Tools that aggregate earnings reports, investment data, and private company information provide competitive intelligence.
Regulatory and legal filings: Government databases and regulatory disclosures add credibility and transparency to market analyses.
News and media monitoring: Curated feeds of company announcements, M&A activity, and product launches can reveal competitive shifts.
Third-Party data aggregators: Comprehensive providers integrate multiple data types—financial, legal, biographical, regulatory, and industry-specific—into enriched, structured datasets ready for analysis or AI consumption.
Explore LexisNexis Data Sets
By combining these sources, consultants can offer clients a 360° market view grounded in accurate, validated intelligence and confidently power AI tools with trustworthy inputs.
As a consultant, your value lies in delivering insights clients can trust. That starts with knowing where to find reliable market size and competitor data (and which sources to avoid)
Aligning with proven third-party data providers ensures that your recommendations rest on a foundation of accuracy, relevance, and timeliness. It also safeguards your use of AI by ensuring the systems you deploy are trained and fueled with credible inputs. The result? Stronger strategies, smarter AI outputs, more confident clients, and a reputation for rigor in a world where data-driven decision-making is non-negotiable.
Want to learn more about fueling credible AI models? Download the free toolkit offered by LexisNexis.
Consultants often combine market research reports, company filings, financial data providers, and third-party aggregators to build an accurate picture of market size and dynamics. These sources also provide the kind of structured data that can support reliable AI models.
There isn’t a single “best” source. The most reliable competitor insights come from cross-referencing multiple streams: financial data, industry news, regulatory filings, and private company databases. When integrated, these datasets create strong inputs for AI tools that consultants may use.
Check for transparency in methodology, breadth of sources, frequency of updates, and whether the provider offers enriched and structured datasets. If the process is unclear, the data may not be reliable—and it may not be safe to use for AI.
Bad data can distort market sizing, mislead client strategies, and damage your reputation as an advisor. It also risks corrupting AI outputs, since AI systems can only be as strong as the data that fuels them.