There is a moment in every significant business deal — an acquisition, a merger, a major licensing agreement, or a venture investment — when someone on the team asks: what are we actually buying? For many transactions, the most valuable assets are not machinery, real estate, or even the customer list. They are the patents, trademarks, copyrights, and trade secrets that form the company intellectual property portfolio. And if you have not rigorously examined what you are getting, you may be buying a problem.
Table of Contents
IP due diligence is the systematic investigation of a company intellectual property assets before a transaction closes. It is not glamorous work — it involves poring through patent files, trademark registrations, licensing agreements, employee IP assignment records, and ownership chains. But skip it, and you risk inheriting invalid patents, infringement liabilities, ownership disputes, or a portfolio worth a fraction of what you paid for it.
What IP Due Diligence Actually Covers
Thorough IP due diligence goes well beyond listing what patents and trademarks a target company holds. A proper review covers several interconnected areas.
Patent Portfolio Assessment
This includes verifying that patents are actually owned by the company (not a founder personally or a prior employer), that maintenance fees are current, that patents have not been previously licensed away or encumbered, and — critically — assessing the actual quality and validity of the patent claims. A company might claim 100 patents, but if 60 have claims so narrow they provide no real competitive protection, that number is deeply misleading.
Trademark Ownership and Status
Trademark registrations must be verified across relevant jurisdictions. Are marks registered in the markets where the business actually operates? Are renewals current? Has the company been enforcing its marks — because failure to police trademarks can result in abandonment claims? Our resource on trademark monitoring practices explains how active enforcement is part of maintaining trademark value.
Licensing Agreements Review
Every licensing agreement — whether as licensor or licensee — needs review for scope, exclusivity, territory, royalty obligations, and change-of-control provisions. Many agreements include provisions allowing termination or modification if the company is acquired. Discovering this after the deal closes is a very expensive surprise.
Employment and Contractor IP Assignments
Who actually invented the patents? Were the inventors properly employed by the company at the time? Did all contractors and consultants sign IP assignment agreements? Companies that relied heavily on independent contractors — particularly in software development — may have gaps in IP ownership that are difficult and expensive to fix post-acquisition.
Freedom-to-Operate Assessment
Does the target core product infringe any third-party patents? For technology companies, this is increasingly important. An acquirer that inherits an undisclosed patent infringement liability can face immediate litigation costs or injunctions affecting the acquired business core operations.
Why IP Due Diligence Is Non-Negotiable: The Business Case
Intangible assets — primarily intellectual property — now account for an estimated 90% of the value of S&P 500 companies, with the global value of intangible assets exceeding $62 trillion. When you are acquiring a technology company, a pharmaceutical firm, or a consumer brand, you are often acquiring an IP portfolio first and a business operation second.
Yet deals consistently fail to adequately scrutinize these assets. A landmark analysis of 40,000 M&A deals over four decades found that 70 to 75 percent of acquisitions failed to deliver expected value, largely due to inadequate pre-deal analysis. IP issues are a major contributor. The global IP valuation market reflects this growing recognition — valued at approximately $12.8 billion in 2025, it is projected to reach $31.5 billion by 2035 at an 11.4% CAGR, driven substantially by M&A activity in technology and pharmaceutical sectors.
How IP Due Diligence Is Conducted: A Practical Walkthrough
Phase 1: Document Collection and Initial Inventory
The process begins with a formal data room review. All IP-related documents are collected: patent and trademark portfolios with registration certificates, prosecution histories for key patents, all licensing and IP assignment agreements, employee invention assignment agreements, NDAs with key partners, and any litigation history involving IP disputes. Creating a comprehensive IP inventory is itself a deliverable — many companies lack a clear picture of their own IP assets.
Phase 2: Ownership Verification
Every patent and trademark is verified in relevant patent and trademark office records. This frequently reveals issues: assignments never recorded, patent rights that reverted to inventors due to procedural lapses, or trademarks registered in a founder personal name rather than the company. This is where professional IP due diligence separates itself from a quick internal review — experienced IP professionals know where the common failure modes are.
Phase 3: Quality Assessment of Core IP Assets
Not all patents are equal. A patent with broad, well-crafted claims covering the company core technology is a genuine competitive asset. A patent with narrow claims that can be designed around in 30 minutes is essentially worthless. IP due diligence teams conduct at least a preliminary invalidity analysis on key patents. Our article on patent invalidity searches explains how this assessment works in practice.
Phase 4: Licensing and Encumbrance Review
Every licensing agreement is examined for provisions affecting transferability. Open-source software licenses — particularly copyleft licenses like GPL — can have significant implications for software companies. Acquirers have discovered post-close that open-source obligations effectively prevented commercializing key code as planned.
Phase 5: Risk Report and Deal Structuring Recommendations
The due diligence team produces a risk-ranked report identifying issues, their potential financial impact, and recommended deal structuring adjustments — IP representations and warranties, escrow arrangements, or price adjustments. Sometimes the report reveals issues significant enough to walk away from the deal entirely.
What Can Go Wrong Without Proper IP Due Diligence
In one common scenario, a technology acquirer paid a substantial premium for a startup software platform, only to discover post-close that core algorithms had been developed by a contractor who retained IP rights under a poorly drafted consulting agreement. Renegotiating an IP assignment from a now-motivated party turned into a protracted dispute costing more than the original due diligence would have.
In the pharmaceutical sector, acquirers have discovered that drug patents relied upon to justify acquisition premiums were vulnerable to obviousness challenges — challenges that subsequently materialized in IPR proceedings, collapsing the patent protection that justified the acquisition price. Change-of-control provisions in licensing agreements are another recurring problem. A company may have licensed key technology on terms making the license terminable upon acquisition — the acquirer then discovers they do not have the rights they thought they were buying. These are not edge cases. They are common enough that experienced M&A counsel now considers IP due diligence as important as financial due diligence in any IP-intensive transaction.
How PerspireIP Supports IP Due Diligence
PerspireIP brings specialized IP expertise to due diligence engagements that general M&A counsel often cannot provide in-house. Our team conducts comprehensive patent portfolio assessments — including preliminary invalidity analysis on core assets — trademark ownership verification across multiple jurisdictions, and licensing agreement reviews focused on IP-specific risk factors. We deliver actionable intelligence rather than just information, structured to integrate directly into M&A workflows. Reach out to our team to discuss your due diligence needs and timeline.
Looking to protect your IP across the board? Read our expert guides on trademark monitoring and patent invalidity searches — both critical pillars of a comprehensive IP strategy alongside due diligence.
Frequently Asked Questions About IP Due Diligence
Q1: When in the M&A process should IP due diligence actually start — and can it be done too late?
Start as early as possible — ideally at the letter of intent stage, before either party is too committed to walk away from problems. Early IP due diligence findings can reshape valuation negotiations and deal structure before significant legal fees accumulate. Starting late (say, two weeks before signing) creates a terrible dynamic: issues get rushed, get missed, or get papered over with inadequate warranty protection because no one wants to blow up a deal so close to closing. If your adviser is saying “we’ll handle IP due diligence after the term sheet is signed,” push back.
Q2: What’s the most common thing companies miss in IP due diligence?
Ownership chain gaps — by a wide margin. Early-stage technology companies often have founders and early contributors who wrote code or developed inventions before the company had proper IP assignment agreements in place. Contractors who built the core product may have retained IP rights under poorly drafted consulting agreements. The company believes it owns its technology; legally, it may not. This is fixable before an acquisition closes — but discovering it post-close turns a solvable problem into an expensive, adversarial one. We see this pattern constantly, and it’s the single most valuable thing a thorough IP due diligence review uncovers.
Q3: We’re looking at a smaller deal — a minority stake, not a full acquisition. Do we still need full IP due diligence?
Yes, proportionate to the IP intensity of the business. For a pure services company with minimal IP, a light review may suffice. But for any technology company, pharma, biotech, consumer brand, or creative content business — even at early stages — the IP IS the business. A minority investor who hasn’t reviewed the IP portfolio has no real idea what they’re investing in. The standard should be: if the company’s value is substantially derived from IP, full due diligence is warranted regardless of deal size or equity percentage.
Q4: We found some IP problems during due diligence. Does that kill the deal?
Not necessarily — finding problems is actually what due diligence is for. The options range widely depending on the severity: renegotiate the purchase price to reflect reduced IP value; require the seller to fix issues before closing (obtaining missing assignments, renewing lapsed registrations); require robust IP representations and warranties with indemnification and escrow; structure as an asset purchase rather than a stock purchase to limit inherited liability; or, if problems are unfixable or the risk is unacceptable, walk away. The key is that you have leverage before close that you don’t have after. Problems discovered post-close become your problems to solve.
Q5: Can IP due diligence actually uncover value we didn’t know about, or is it just about finding problems?
Absolutely — and this is genuinely underappreciated. A thorough review sometimes reveals that a target company has significant unlicensed IP generating zero revenue that could be monetised through licensing. International registrations that lapsed but are easily reinstated. Patent claims that could be broadened through continuation applications. Trade secrets that are underdocumented and underprotected but genuinely valuable. IP due diligence isn’t just risk avoidance — it’s understanding the full value of what you’re acquiring, including value the seller may not even realise they have.
Sources & Further Reading: Gibson Dunn – Top IP Issues in M&A Deals | WIPO – IP Valuation | IAM Media – IP Due Diligence | Lexology – IP Due Diligence Resources