Contributors: Igor Shaverskyi
Last updated: July 2025
If you’re fundraising, prepping for M&A, or exploring a strategic partnership, due diligence is coming your way.
And it’s rarely quick or easy.
Investors and buyers will dig deep, and if your data isn’t clear, organized, or defensible, the deal can stall or fall apart.
That’s where the right due diligence companies come in. Good consultants know what VCs and acquirers look for—and how to get you ready fast. From cleaning up your data room to stress-testing your metrics, they help you avoid landmines and keep momentum on your side.
We’ve prepared a list of due diligence firms worth knowing and a quick guide on how to choose the right one, what to expect, and where the market is headed.
Let’s dive in!
Best 3 due diligence service providers in 2025 at a glance:
Top due diligence companies: A deep dive
1. Waveup
With over 10 years of experience in finance, venture funding, M&A advisory, and business growth, Waveup knows how to support the entire startup journey and venture capital cycle. The company has a team of professionals with deep knowledge in financial, legal, and strategic analysis, working from different parts of the world. Waveup operates not only as a due diligence consultant but also as a business growth partner, fundraising assistant, and pitch deck specialist.
Founded: 2014
Location: Offices in London and Kyiv
You can benefit from:
Industry focus: 100+ industries
Best for: Series A–C founders who need DD plus pitch-deck optimisation.
Client testimonials:
“Insightful, strategically minded, experienced, thoughtful, and proactive.” Walter Craven, CEO at Kabin.
“The Waveup team has been a trusted advisor in not only helping us shape our pitch deck, but also in providing guidance and insight into the fundraising process and market. Their team is always willing to take time to listen, work with us, and advise without ever making us feel like we’re being rushed through any process.” Touradj Barman, CEO & Founder at Up ‘n go.
Notable achievements: As a business, fundraising, and due diligence consultant, Waveup has helped over 1,000 clients raise over $3 billion in venture capital. The firm has 120+ VC partners globally. Recently, Waveup has launched a platform for startups with contacts of top VCs, insights on business and fundraising journeys, editable templates of pitch decks, and access to VC fundraising tools such as cap tables and one-pagers.
Contacts: Contact-us page, LinkedIn
2. EY (Ernst & Young)
EY is one of the leading accounting and consulting firms in the world. The company offers various services, with due diligence consulting on the list. EY operates in over 150 countries, has more than 400,000 employees worldwide, and helps large-cap, middle-market organizations, private equity funds, and digital companies. In 2023, the company earned over $49 billion, which proves its strong market position and customer trust.
Founded: 1989
Location: With 700 offices in over 150 countries, the company operates in 22 regions grouped into three geographic areas: the Americas, EMEIA (Europe, Middle East, India, and Africa), and Asia-Pacific.
Key services:
Due diligence consulting
Strategy consulting services
Corporate finance services
Tax services
Law services
Industry focus: Advanced Manufacturing and Mobility, Government and Infrastructure, Consumer, Energy and Resources, Financial Services, Media & Entertainment, Telecommunications, Health, Technology
Typical clients: PE funds, strategic buyers, IPO candidates
Notable achievements: EY works to bridge the gender gap and improve disability inclusion. This due diligence service provider won SAP Hack2Build Sustainability awards for North America, Asia Pacific, Japan, and EMEIA in 2023 and 2022.
Contacts: Contact-us page, LinkedIn
3. L.E.K. Consulting
Founded by former Bain & Company partners James Lawrence, Iain Evans, and Richard Koch in 1983, L.E.K. is one of the top management consulting firms in the world. Whether you’re searching for a due diligence support or help with M&A, corporate strategy, or marketing and sales, turning to L.E.K. is always a good choice.
Location: Headquartered in Boston, MA, with offices in Asia Pacific and Europe
Services the company provides:
Industry and market analysis
Due diligence for companies
M&A advisory
Marketing & sales assistance
Industry focus: Business Services, Energy & Environment, Financial Services, Private Equity, Retail, Technology, Healthcare Services, Industrials, Life Sciences & Pharma, Consumer Products, Education, Media & Entertainment, MedTech, Travel & Transport.
Notable achievements: In 2025, the firm ranked 26th on Vault’s list of the top 50 consulting firms in North America. Additionally, in 2008, L.E.K. was the first major firm to achieve carbon-neutral status.
Contacts: Contact-us page, LinkedIn
4. Alpha Apex Group
Alpha Apex Group is a hybrid executive search and due diligence company that combines C-suite background checks with legal and financial red-flag reviews.
Founded: 2020
Location: Denver, Colorado
The company’s toolkit:
Executive search & recruiting
Due diligence support
Market analysis
Management consulting
Sweet spot: Founder-led US lower-mid-market deals (<$250 M).
Industry focus: Spans 33 industries, from Gambling to Wellness and Aerospace
Contacts: Contact-us page, LinkedIn
5. Due Diligence Consulting (DDC)
DDC is a boutique consulting firm that offers corporate due diligence services. The firm can also help you with background checks to know whether you’re hiring the right talent. DDC has clients among Fortune 500 companies, private equity funds, VC funds, accounting firms, family offices, law firms, private companies, and hedge funds.
Founded: 2005
Location: Naples, Florida, the US
What this company offers:
Background checks
Investment due diligence consulting
Investigations
Industry focus: Private Equity, Financial Services, Healthcare, Pharmaceuticals, Technology, and Real Estate
Contacts: Contact-us page, LinkedIn
6. Alacrita
Alacrita is a due diligence company that helps pharmaceutical and biotechnology startups (often on tight secondary-market timelines). Given the 20+ years of experience, its expertise has been rooted in technical, scientific, and commercial areas, so you can be pretty sure you’ll get full-fledged assistance.
Location: Offices in Cambridge, London, San Diego, California, Tel Aviv
Services to use:
Due diligence support
Help with product and business development
Strategy assistance
Contacts: Contact-us page, LinkedIn
7. Oceanrock Consulting
Founded in 2016, Oceanrock delivers professional commercial due diligence services. Backed with 50+ experts, the company provides flexible, cost-effective solutions for mid-market and global firms.
Location: Headquarters in Cape Town, South Africa
Key services:
Research and due diligence for companies
Financial modeling
Portfolio management
M&A support
Industry focus: Private Equity, Private Debt, Corporate Finance
USP: Flexible project pricing and custom KPI dashboards across the portfolio after close—giving teams better visibility and control post-deal.
Contacts: Contact-us page, LinkedIn
8. GRAPH
Led by Kaylee Philbrick-Theuerkauf, a consultant with more than 22 years of experience, the Exceptional Plan was developed “by entrepreneurs for entrepreneurs.” GRAPH is a boutique consulting firm that backs global corporations and investors. The company helps clients identify market opportunities, conduct thorough corporate due diligence, and develop growth strategies.
Founded: 2017
Location: Offices in London and Washington DC
Key services:
Commercial due diligence
Growth strategy
Market research
Strategic advisory
Industry focus: Business, Infrastructure, Consumer, Retail and Leisure, Energy and Utilities, Financial and Professional Services, Transportation, Health and Life Sciences, Industrial Products and Services, Technology and Media
Contacts: Contact-us page, LinkedIn
9. Consultport
Consultport is a platform that can connect you with professionals from different areas, including a due diligence team, digital experts, and managers. Since 2018, the company has created a pool of over 10,000 experts across 50 countries. The fact that Consultport has a 97% client satisfaction rate is a good sign of quality and customer commitment.
Location: Headquartered in Berlin, Germany, with offices in London, Dubai, and Mumbai
How you can benefit:
Market analysis
Risk assessment
Growth potential evaluation
Stakeholder management
Post-merger integration planning
Industry focus: Agnostic
Great for: Plug-and-play talent when in-house bandwidth is tight.
Contacts: Contact-us page, LinkedIn
10. Boston Consulting Group (BCG)
BCG is a part of the “Big Three” management consulting firms, alongside McKinsey & Company and Bain & Company. Founded in 1963, this company has a lot to offer to its clients, including due diligence consulting. BCG helps businesses, organizations, and even governments solve their most complex problems.
Location: Headquartered in Boston, and it serves 90 cities across more than 50 countries, from Santiago to Tokyo
Key services:
Due diligence consulting
Detailed analysis and planning for M&A
Business strategy
Operations consulting
Financial services
Industry focus: Aerospace and Defense, Automotive Industry, Travel and Tourism, Financial Institutions, Technology, Media, and Telecommunications, Consumer Products, Industry, Education, Energy, Health Care Industry, Insurance Industry, Principal Investors and Private Equity, Industrial Goods, Public Sector, Retail Industry, Transportation and Logistics
Contacts: LinkedIn
How we chose these due diligence companies
We reviewed company websites to understand their services, industries, and who they typically work with. We also looked at sources like PitchBook and Crunchbase to get a sense of their size and reputation.
Some firms focus on early-stage startups, others on big M&A deals, so we included a mix to find what fits you. This is a list of companies we think are genuinely worth checking out.
What is due diligence (and why it actually matters)
Due diligence is a deep dive conducted by investors, buyers, lenders, or partners to understand the business they’re backing or buying. They want to verify the information and check if their expectations about your company are true.
They’re not looking for perfection—but they do want transparency and no surprises.
That doesn’t mean dealmakers will dig into every single detail of your past, but they’ll go deep enough to assess risk and spot red flags. If something concerning comes up, it won’t always kill the deal—but it might impact your valuation or lead to stricter terms.
Many founders seek due diligence consulting because they lack expertise or experience in complex financial analysis, legal and regulatory areas, market and industry research, or risk identification.
You’ll typically face due diligence if you’re:
Closing a funding round;
Entering an M&A deal;
Preparing for an exit.
Good due diligence consultants know what investors care about, how to package your data, and how to avoid unnecessary friction.
So you can stay focused on building while they manage the details that matter most when the stakes are high.
Common landmines during due diligence, consultants can help handle:
Cap table issues are a frequent concern. Dealmakers will carefully review your ownership structure to make sure it’s clean and logical. They’ll look at how much equity is already allocated, what’s left for future hires and rounds, whether equity is fairly distributed, and whether there are any red flags in employee compensation packages that could complicate the deal.
Revenue, budgets, and financial forecasts are also under review. A due diligence consultant can help you ensure your past, present, and future numbers are well-presented, as dealmakers will look at your numbers forward and backward. For instance, when you’re pitching to investors, you’ll talk about traction and future potential, so be sure you don’t oversell or undersell your company and that you’re characterizing your revenue correctly. Also, investors may zoom in on one part of your model to test if your assumptions hold up. Be prepared for this as well.
On the operational side, expect scrutiny around your product, technology, and company records. Investors or buyers may bring outside expertise to conduct tech, legal, or tax due diligence. Due diligence firms will help you prepare for this dive-in. Getting their formation documents, authorizations, grants, insurance, and past board meetings in order is a meat-and-potatoes issue for business founders. And it’s better to start doing it from the very beginning so your documents are always accessible and easy to find.
In a nutshell, due diligence consultants help you overcome all the due diligence-related bottlenecks and arrive at the best deal or investment.
Types of due diligence for companies
There are several types of due diligence that your business can be subjected to. In this section, we’re going to discuss the five main:
- Financial due diligence consulting
This type helps dealmakers check the ins and outs of your company’s financial health, as when it comes to any business, money comes first. Consultants typically review and analyze financial statements, revenue streams, cash flow, profit margins, debt levels, and, in fact, the overall financial stability of your company. Due diligence service providers dive into financial projections and past data to check for accuracy.
- Legal due diligence
Dealmakers request for legal due diligence because they want to avoid any possible legal complications post-deal. In this case, due diligence consultants review all the legal documents—contracts, licenses, intellectual property, and ongoing or potential litigation. They also examine intellectual property rights to make sure everything is legally secure.
- Tax due diligence
This type of due diligence helps clarify the tax landscape and find ways to save money. Here, consultants often review your company’s tax compliance history, check tax liabilities, and spot potential tax risks. All this is done to ensure you and investors or buyers are on the right side of the tax table.
- Operational due diligence consulting
Operational due diligence is about daily operations analysis—how resources and people are managed on a daily basis. Due diligence companies evaluate supply chain management, manufacturing processes, tech systems, and human resources to check if there are more efficient ways to run operations and if there are any potential risks.
- Commercial due diligence
Here, consultants will look at your position in the market, customer base, competitive moat, and growth opportunities. In short, investors or buyers require this type of due diligence to see if your business has the ability to grow and, more importantly, stand out and succeed in the industry.
These aren’t the only types of due diligence consultants offer, but they’re the most common. In smaller or simpler deals, each type can be handled separately. As for larger or more complex transactions, they’re usually combined into a full-scope process.
How to choose the right due diligence company?
Similar to choosing consultants for business plan development, venture capital, market research, or other areas, finding the right due diligence company isn’t easy.
Just as investors or buyers thoroughly diligence you, you should diligence them as well.
Look beyond the surface. What services do they offer? Do they have real expertise in your space? Can they back it up with results?
A good due diligence firm should be able to meet your business where it is—and help you get where you’re going.
Here’s what to watch for:
Industry fit. If you’re building a tech company, a consultant with biotech experience won’t cut it. You want someone who understands your business model, KPIs, and the nuances of your space.
Their track record. Consultants who haven’t previously worked with similar companies to yours—be it in terms of a business model, industry, or size—may not give you 100% results. Only those due diligence companies that are on the same page as you can pull all the necessary data together and analyze it.
Reputation. Look through the previous clients’ reviews and feedback; this can be a good source of information.
If they are compatible with you and your team. You’ll be working with a consultant closely, so make sure you and your team can find common ground with them. Are they good communicators? Do they explain everything clearly, and are they good team players? As a matter of fact, a good working relationship helps a lot.
Fee structure. It’s better to know from the start how much a due diligence firm’s services cost and how they charge. This will help you avoid unpleasant surprises when the bill comes.
The future of due diligence companies
Traditional due diligence—manual, slow, and prone to human error—is quickly becoming outdated. In large, complex deals, consultants used to sift through mountains of data by hand. It was time-consuming and overwhelming, even for seasoned professionals.
That’s changing.
Today, due diligence is faster, more tech-enabled, and more strategic.
Modern due diligence teams focus on two things: value creation and risk mitigation.
Financial, tax, and legal reviews are still essential, but they’re no longer enough. The risk landscape is evolving, and so are the checks needed to navigate it.
That’s why new areas like digital due diligence, ESG, and IT/cyber are becoming standard parts of the process—especially in tech-driven or international deals.
A quick data point: According to a recent KPMG study, 4 in 5 dealmakers now factor ESG into their M&A plans.
It’s no longer just about confirming what’s there. It’s about understanding what the deal can deliver—and what might get in the way. The best due diligence companies are leaning into this shift, offering a more holistic view that aligns short-term validation with long-term value.
Key trends in due diligence consulting
Due diligence becomes more holistic. Beyond financial, tax, and legal checks, due diligence now includes ESG, cybersecurity, and supply chain evaluations, just to name a few. Given the expansion of the checked areas, dealmakers can address more risk areas, including environmental, regulatory, and operational ones.
Due diligence becomes more tech-driven. Automation, artificial intelligence, and data analytics help due diligence companies spot trends, laps, risks, and opportunities faster and more effectively.
Customized due diligence is on the rise. Different sectors require different due diligence approaches. What works well for biotech might not work for the AI sector. That’s why due diligence companies become more focused on providing tailored solutions.
Final thoughts on due diligence consulting
Whether you’re thinking about selling your company, raising another funding round, or going public, due diligence will be your companion. The people across the table want to be pretty sure they’re entering a worthy deal.
At its core, due diligence is about checking how your company is performing—and what value it brings.
But many founders don’t know how to prepare for it properly.
And that’s where due diligence firms become of much help.
Consultants dig into your financials, cash flow, debt, operations, market, and growth potential. Then, they translate it all into a clear, investor-ready picture—with insights, red flags, and recommendations.
Of course, due diligence consulting is just one part of getting a deal across the line. At Waveup, we take a broader view—helping you raise capital, grow faster, expand into new markets, and land high-impact M&A deals.
Contact our team, and we’ll gladly assist you in your business and fundraising journeys.
FAQs
What are due diligence companies?
Due diligence companies help investors, buyers, and founders assess the true state of a business before a major transaction—like fundraising, acquisition, or going public. They typically review financials, legal documents, operations, and other major areas to spot risks and validate the opportunity.
Which company is best for due diligence?
The “best” company depends on your industry, deal size, and specific needs. Some firms specialize in financial due diligence, others in legal or technical. The right fit is consultants who understand your sector, have a strong track record, and can adapt to your deal’s scope and timeline. Yet, you can start with the top picks like EY, Waveup, or L.E.K. Consulting.
Is due diligence part of M&A?
Yes, due diligence is a core part of any M&A process. Buyers use it to assess the target company’s financial health, legal standing, growth potential, and risks before finalizing the deal.
Is due diligence difficult?
It can be—especially if you haven’t been through it before. The process is often detailed, time-sensitive, and resource-intensive. That’s why many founders work with due diligence consultants who know how to do it right.
What is the highest level of due diligence?
That would be comprehensive due diligence, which includes a full review across financial, legal, operational, tax, commercial, IT, ESG, and sometimes reputational aspects. It’s typically used in large or complex deals.