A machine, a tool, or a product built years ago finally fails and badly injures someone — and then the search for who is responsible hits a wall. The company that made it has been sold, merged, dissolved, or absorbed into a larger business, and the new owner says the same thing every buyer says: we only bought the assets, not the liabilities, and we did not make the thing that hurt you. This is the problem of successor liability — whether the company that bought or took over a manufacturer can be held responsible for injuries caused by products the original maker put into the world.
The starting rule favors the buyer. As a general matter, a company that purchases another’s assets does not automatically inherit its debts and liabilities. But that rule has real exceptions, and they are where these cases are fought. If the transaction was really a continuation of the old business under a new name, if it amounted to a merger in everything but label, if the parties structured it to dodge liability, or if the buyer expressly or effectively took on those obligations, the successor can be on the hook. Whether one of those exceptions fits is a fact-intensive question that the buyer’s tidy “we just bought assets” story often does not survive. The real story is usually written in the deal documents, not in the letter denying responsibility.
What follows is how successor liability works in Massachusetts: the mere-continuation idea and the limits of the broader product-line theory, the de facto merger exception, and the duty to warn a successor can assume. This is general information, not advice about a specific case. Because these questions arise inside product and defective-equipment claims, our overview of a Boston personal injury claim is a useful starting point.
Can you sue the company that bought the manufacturer?
The threshold question is whether a buyer of a manufacturer’s business can be answerable for the maker’s products. The default answer is no, with important exceptions.
The general rule and why it exists
The baseline is that a company buying another’s assets takes the assets free of the seller’s liabilities unless it agrees otherwise. The rule exists for good commercial reasons: buyers need to be able to purchase assets with a predictable understanding of what they are taking on, and a market for distressed or sold businesses depends on that predictability. So a purchaser can generally acquire equipment, inventory, and a product line without automatically inheriting every lawsuit the seller might ever face. Predictability in that market is a legitimate value the default rule is meant to serve. That default protects legitimate asset sales — but it was never meant to let a business escape responsibility by reshuffling its corporate form while continuing on as before. The exceptions exist precisely to police that line between a genuine sale and a cosmetic one. Drawing that line fairly is what keeps the rule from becoming a loophole.
The exceptions that matter
Massachusetts recognizes the traditional exceptions to that rule. A successor can be liable where it expressly or impliedly agreed to assume the liabilities, where the transaction was a de facto merger, where the buyer is a mere continuation of the seller, or where the deal was a fraudulent effort to avoid the seller’s obligations. Each exception targets the same underlying concern: a sale that is, in substance, just the old business carrying on under new ownership, or a deal engineered to strand injured people while the enterprise rolls forward. Each is a way of asking whether anything of substance really changed hands or only the nameplate did. When the facts fit one of these categories, the “we only bought the assets” defense fails, and the successor answers for the harm. Which of the exceptions fits is where nearly all the litigation energy goes.
What this means for an injured person
For someone hurt by a product whose maker no longer exists in its old form, the practical lesson is that the buyer’s denial is a starting position, not a conclusion. Whether a successor is liable turns on the real substance of the transaction — how it was structured, what the buyer took, and whether the business simply continued — not on the label the parties gave it. Because the original manufacturer may be gone or insolvent, reaching the successor is often the only path to a meaningful recovery, which is exactly why the buyer fights so hard to stay out. The stakes of the threshold question are, in practice, the stakes of the whole case. The transaction documents usually tell a fuller story than the buyer’s summary of them. What a buyer chooses to emphasize and what the paperwork actually says are frequently two different things.
The mere-continuation and product-line theories
Two related but distinct ideas try to reach the buyer: that it is simply the old company continued, and the broader theory that it should answer for the product line it took over.
The “mere continuation” exception
The mere-continuation exception applies when the successor is, in reality, the same enterprise as the seller wearing a new name. Courts look for telltale signs: the same ownership and management, the same employees, the same product and operations, the same everything except the corporate label. Where those hallmarks are present — especially a continuity of ownership, so that the people who ran the old business run the new one — the law treats the buyer as a continuation of the seller and holds it responsible for the seller’s liabilities. Ownership continuity is the single fact that most reliably distinguishes a real sale from a relabeling. When the same hands stay on the wheel, the change of name convinces no one for long. The exception targets the situation where a business has changed its clothes but not its identity, and it prevents that costume change from erasing the injured person’s claim. Courts are alert to reorganizations whose main effect is to leave creditors and claimants behind. The identity of a business lives in its people and operations, not in the name printed on the door.
The product-line theory and its limits
A broader theory, adopted in some states, would hold a company that continues manufacturing and selling the same product line responsible for defects in units the original maker built, even without the continuity that the traditional exceptions require. The claimant’s argument is intuitive: the successor took the product line, the goodwill, and the benefits, so it should take the responsibility too. But Massachusetts has been reluctant to adopt this broad product-line exception, generally adhering instead to the traditional categories — continuation, de facto merger, assumption, and fraud. That means an injured person in Massachusetts usually cannot rely on the product-line theory alone and must fit the facts into one of the recognized exceptions, which makes how the deal was actually structured all the more important. A sophisticated buyer will have structured the transaction with these exact rules in mind.
Why the distinction decides cases
The gap between what the traditional exceptions require and what the product-line theory would allow is often the whole ballgame. A buyer that carefully avoided continuity of ownership and structured a clean asset purchase may escape liability under the traditional rules even though it kept making the same product — the very situation the product-line theory was designed to reach, and the one Massachusetts has generally declined to. That gap is a deliberate policy choice, and it shapes how every one of these claims has to be framed here. So these cases turn on close attention to the deal: who ended up owning and running the successor, what was really transferred, and whether the substance of the transaction fits a recognized exception. Miss those details and a viable claim can look hopeless, or a weak one can look strong. The label the parties chose matters far less than what actually happened. Courts have seen enough creative labeling to look straight past it to the substance.
De facto mergers
The de facto merger exception reaches a transaction that is a merger in substance even though it was papered as an asset sale.
When an asset sale is really a merger
Sometimes a deal is labeled an asset purchase but functions exactly like a merger, folding the seller into the buyer as a single continuing enterprise. The law looks past the paperwork to that reality. When the substance is a merger, treating it as a mere asset sale would let the parties avoid the liabilities a merger would carry simply by choosing different words, and the de facto merger exception exists to prevent that. The doctrine refuses to let word choice override economic reality. The question is whether, in everything that matters, the two businesses became one — not whether the documents used the word “merger.” Form gives way to function whenever the two point in different directions.
The factors courts weigh
Courts assessing a de facto merger look at a familiar set of factors: continuity of ownership, with the seller’s owners becoming owners of the buyer; continuity of management, personnel, and operations; the seller ceasing its ordinary business and dissolving soon after; and the buyer assuming the liabilities and obligations necessary to carry on the seller’s business uninterrupted. No single factor is decisive, and the analysis is holistic, but continuity of ownership is especially important. A court weighs the whole picture rather than checking boxes, and the picture usually points clearly one way or the other. Where these factors line up, the transaction has the substance of a merger, and the successor takes on the liabilities a merger would carry — including responsibility for the products that injured someone. The liabilities travel with the enterprise because, in substance, the enterprise never really left.
Same owners, same operations
The through-line of the de facto merger analysis is continuity: the same people, the same operations, the same enterprise, reorganized rather than genuinely sold to an unrelated buyer. When the owners of the old company end up owning the new one, and the business runs on without real interruption, the argument that this was an arm’s-length asset sale rings hollow. The de facto merger exception captures that reality and refuses to let a reorganization that keeps the enterprise intact shed the enterprise’s responsibilities. Proving that continuity — through the transaction documents, ownership records, and how the business actually operated before and after — is the heart of a de facto merger claim. The more the before-and-after picture looks identical, the stronger the claim becomes.
The duty to warn a successor assumes
Even a successor that avoids inheriting the seller’s past liabilities can take on a duty of its own — a duty to warn about dangers in the products the predecessor sold.
Taking over service and customer relationships
When a successor continues to service, repair, or supply parts for the predecessor’s products, and maintains the relationships with the customers who use them, it can assume an independent duty to warn those users of known dangers. This duty does not depend on the successor having made the product; it grows out of the successor’s own ongoing relationship with the product’s users and its knowledge of the hazard. The duty is measured by what the successor did and knew after the deal, not by what the predecessor built before it. A company that steps into the shoes of the maker for purposes of service and support cannot always keep the benefits of that relationship while ignoring the safety obligations that come with it. Stepping into the maker’s role for profit can mean stepping into it for safety, too.
When a duty to warn arises
Whether a successor has a duty to warn depends on factors like its succession to the predecessor’s service contracts and customer relationships, its knowledge of the defect or danger, whether it had a way to identify and reach the product’s users, and the burden of giving a warning weighed against the risk. Where a successor knows a product in the field is dangerous and is already in contact with the people using it, the case for a duty to warn is strong. This is a separate theory from inheriting the predecessor’s liability, and it can reach a successor that would otherwise escape responsibility for the original manufacturing. In that sense the duty to warn is a second, independent road to the same defendant. Even a buyer that dodges the inheritance exceptions can still owe this duty on its own.
The defense that no duty was assumed
Successors argue they assumed nothing beyond the assets they bought and owe no duty to warn about products they did not make. That can be right where the successor took no service relationships, had no knowledge of the danger, and had no practical way to reach users. But it is a fact question, not an automatic defense. Where the successor did continue the service and support relationships and did learn of a hazard, its claim to owe no duty weakens considerably. The dispute usually comes down to what the successor actually took over and knew — the same close, factual inquiry that runs through every corner of successor liability. Almost nothing in this area is settled by a label; it is settled by the facts. A careful record of the successor’s post-sale conduct usually decides the point.
Injuries, parties, and recovery
Successor-liability questions usually surface in serious product and equipment cases, where identifying a solvent responsible party is everything.
The injuries these cases involve
These claims tend to arise from dangerous machinery, industrial equipment, tools, vehicles, and other products that cause severe harm when they fail — amputations, crush injuries, burns, and other catastrophic injuries with lifelong consequences. The gravity of the harm is often what makes the successor question decisive: a person facing a lifetime of consequences needs a defendant that actually exists and can pay, and when the original maker is gone, the successor may be the only one left. A verdict against a dissolved company is worth nothing to the person who has to live with the injury. That reality is what makes the hunt for a solvent successor so central to these cases. That is why establishing successor liability is frequently the difference between a real recovery and a claim against an empty shell. The corporate autopsy is not a technicality here; it is the case. Understanding what happened to the company is inseparable from understanding whether there is anyone left to hold responsible.
Who can be held responsible
Product cases frequently involve a chain of responsible parties, and the successor is only one link. Depending on the facts, a claim may reach the successor company, other entities in the product’s distribution chain, sellers, and parties responsible for maintenance or modification, in addition to any surviving piece of the original manufacturer. These are the same layered questions our product liability work addresses, and successor liability is one important tool for making sure a defunct manufacturer’s disappearance does not leave an injured person without a remedy. It is often the tool that keeps a strong product case from failing for lack of a defendant. Mapping every potentially responsible party is central to a full recovery. A defunct manufacturer is a reason to widen the search, not to abandon it. The disappearance of one defendant often just shifts attention to the parties standing in its place.
What a claim can recover
Where liability is established, an injured person can generally recover the full measure of the harm: medical expenses, lost income and earning capacity, and compensation for pain, suffering, and the lasting effects of the injury, reduced only by any comparative fault properly assigned under Massachusetts General Laws chapter 231, section 85. Reaching a solvent successor is often what makes that recovery attainable rather than theoretical. The whole point of the successor-liability inquiry is to connect the injured person to a party with both responsibility for the harm and the resources to answer for it. Responsibility without a solvent defendant is cold comfort, and this doctrine is aimed at closing that gap. Without that connection, even a clear defect can go uncompensated.
Protecting your claim
Successor-liability cases are won in the transaction documents and the corporate history, which takes deliberate digging.
Tracing the corporate history
The central task is reconstructing exactly what happened to the manufacturer — the sale, merger, dissolution, or reorganization — and who ended up owning and running the successor. That history determines which exception, if any, applies, and it is usually buried in acquisition agreements, corporate filings, and records of how the business operated before and after the deal. Following the chain from the company that made the product to the entity that exists today, and pinning down the continuity of ownership and operations along the way, is what turns a “the maker is gone” dead end into a viable claim against a successor. The chain can run through several transactions, and each link has to be traced with care. Persistence in the records is often what a defunct-manufacturer case rewards.
The evidence that matters
The proof lives in documents the successor controls: the purchase or merger agreement, ownership and management records, employee and operational continuity, the handling of the seller’s liabilities, and any service or support relationships the successor took over. Evidence of the successor’s knowledge of the product’s dangers matters to the duty-to-warn theory. What the successor knew, and when, can turn a no-duty defense into a jury question. Obtaining and analyzing this material through the litigation process is frequently what exposes a transaction as a mere continuation or de facto merger rather than the clean asset sale the buyer claims. Buyers rarely volunteer the documents that undercut their own defense, so obtaining them is half the battle. These cases reward careful, document-driven investigation. The answer is rarely on the surface, but it is usually somewhere in the file. Patience with the paper trail is what separates a recovered claim from an abandoned one. The successor is counting on the injured person giving up before the records are pieced together.
When to call a Boston injury lawyer
When a product injures someone and the maker has been sold, merged, or dissolved, the buyer’s claim that it bears no responsibility should be tested, not accepted. A lawyer can trace the corporate history, fit the facts to the recognized exceptions, and pursue the successor and every other responsible party; the work is handled on contingency, so there is no fee unless there is a recovery. Our Boston personal injury attorneys handle serious product and defective-equipment claims, including injuries from commercial vehicles and machinery, across the Commonwealth and in nearby communities including Quincy and Cambridge, as reflected across our practice areas. If a product hurt you and the company that made it has vanished into another, a first conversation costs nothing, and you can reach out to find out who can still be held responsible.
Reviewed and Approved By
This article was reviewed for legal accuracy by Daniel J. Larson, the founding attorney of Larson Law and a Massachusetts-barred personal injury lawyer in Boston. He represents individuals and families harmed by negligence and defective products in serious-injury matters arising from unsafe equipment, motor-vehicle collisions, and other preventable incidents. Attorney Larson works litigation-first, developing each case through detailed investigation, discovery, and expert development with the expectation that it may be tried. Before founding the firm, he defended doctors, hospitals, and other healthcare providers in malpractice litigation at a Boston firm — experience that informs how he anticipates the way corporate defendants build their defenses. He is a member of the Massachusetts Bar Association and the Massachusetts Academy of Trial Attorneys.
Frequently asked questions
The company that made the product was bought out. Can I still sue?
Possibly. The general rule is that a company buying another’s assets does not inherit its liabilities, but there are important exceptions. If the buyer is really a continuation of the old business, if the deal was a merger in substance, if it was structured to dodge liability, or if the buyer took on those obligations, the successor can be held responsible. Whether an exception applies depends on the real substance of the transaction, not the label the parties used. Because the original maker may be gone, reaching the successor is often the only path to a meaningful recovery.
What is the “mere continuation” exception?
It applies when the successor is essentially the same business as the seller under a new name — the same owners, management, employees, product, and operations, with only the corporate label changed. Continuity of ownership, so that the people who ran the old company run the new one, is especially important. When those hallmarks are present, the law treats the buyer as a continuation of the seller and holds it responsible for the seller’s liabilities. The exception stops a business from shedding its responsibilities simply by changing its clothes.
Does Massachusetts follow the “product-line” theory?
Generally not in the broad form some states use. That theory would hold a company that kept making and selling the same product line responsible for defects in units the original maker built, even without the continuity the traditional exceptions require. Massachusetts has been reluctant to adopt that broad exception, adhering instead to the recognized categories — continuation, de facto merger, assumption, and fraud. So in Massachusetts you usually have to fit the facts into one of those traditional exceptions, which makes how the deal was actually structured especially important.
Can the new company be liable for failing to warn me?
Sometimes, and this is a separate theory from inheriting the old company’s liability. When a successor continues to service, repair, or supply parts for the predecessor’s products and keeps the relationships with the people using them, it can take on its own duty to warn those users of known dangers. Whether that duty exists depends on things like its succession to service relationships, its knowledge of the hazard, and its ability to reach users. A successor already in contact with users and aware of a danger has a hard time claiming it owed no duty to warn.
How do I find out what happened to the manufacturer?
That is a core part of building the case. Reconstructing the corporate history — the sale, merger, dissolution, or reorganization, and who ended up owning and running the successor — usually requires acquisition agreements, corporate filings, and records of how the business operated before and after the deal. Much of that material is in the successor’s hands and is obtained through the litigation process. Tracing that chain is often what turns an apparent dead end, where the maker no longer exists, into a viable claim against the company that took its place.
Results Disclaimer: Past case results, settlements, and verdicts mentioned on this website do not guarantee or predict a similar outcome in any future case. Every case is unique and depends on its own facts and legal issues.