Leading AI companies including Anthropic and OpenAI have achieved valuations in the hundreds of billions of dollars while remaining private, with no near-term IPO plans. Secondary markets are the only available path for investors seeking exposure. Demand from family offices, institutional investors, and individual investors has driven secondary prices to significant premiums over implied primary round valuations.
The structural conditions that have produced the current secondary market environment are unprecedented in the technology sector. Companies like Anthropic, OpenAI, and SpaceX have attained valuations that in prior technology cycles would have been associated with public companies operating under full SEC disclosure and public market liquidity. These companies have instead chosen to remain private — for reasons that include mission control, flexibility from quarterly reporting pressures, and the ability to manage their shareholder base — while continuing to grow significantly. For investors who want exposure to these companies, secondary markets are the only available mechanism. The demand profile reflects this constraint: family offices that historically allocated to public equities are buying secondary positions; hedge funds and crossover investors are acquiring positions in anticipation of future liquidity events; individual investors are paying large premiums for access to companies they believe represent generational investment opportunities. Secondary platform volumes in AI company shares have increased substantially, and pricing has in some periods reflected significant premiums to implied primary round valuations. The enthusiasm is understandable given the growth trajectories involved, but it creates an environment in which buyers frequently prioritize access over legal diligence — a pattern that carries serious legal risk for the reasons addressed in this guide.
Almost all private company equity is subject to company consent requirements, rights of first refusal for the company and investors, prohibited transferee provisions, and in some cases unexpired lock-up periods. Most secondary buyers never see the shareholder agreement governing these restrictions before agreeing to purchase.
The transfer restrictions that govern private company shares are contained in private documents — shareholder agreements, rights of first refusal and co-sale agreements, investor rights agreements, and equity plan documents — to which the prospective secondary buyer is not a party and which are typically not available to the buyer before the transaction is agreed upon. The principal categories of restriction are: company consent requirements, which provide that no transfer of shares is effective without the company's prior written consent; rights of first refusal, which give the company and its major investors the right to purchase the shares at the negotiated price before any sale to a third party proceeds; prohibited transferee restrictions, which may prevent transfers to competitors, to parties whose ownership would create regulatory complications (particularly national security concerns for AI companies), or to parties whose addition to the cap table would push the company above the 2,000-shareholder SEC reporting threshold; and lock-up provisions, under which shares from recent option exercises or recent financing rounds may be subject to contractual lock-up periods that have not yet expired. The information asymmetry is acute: the selling shareholder has seen these documents and understands the restrictions; the buyer, in most secondary platform contexts, receives only general disclosure about the existence of restrictions rather than the specific documents themselves. This information gap is one of the central legal risks of secondary market purchases.
Under Delaware law, a transfer that violates applicable transfer restrictions is void. The buyer receives nothing — no equity, no shareholder rights, no claim against the company. The buyer's only recourse is contract claims against the seller for breach of the purchase agreement representations.
The Delaware Supreme Court and Court of Chancery have confirmed that private company share transfer restrictions are enforceable under the Delaware General Corporation Law, and that a purported transfer of shares in violation of such restrictions is void — not merely voidable, but void. The legal consequence of a void transfer is that the transfer did not occur in any legally recognized sense: the shares remain owned by the seller (or, if the seller also violated the restrictions, potentially in a complicated ownership dispute), the company's stock ledger is not updated, and the purported buyer acquires no rights of any kind. The buyer does not become a shareholder, does not acquire voting or economic rights, and has no claim against the company. The buyer's available recourse is limited to claims against the seller under the purchase agreement — typically a breach of warranty claim arising from the seller's representation that they had the right to transfer the shares. This recourse is contractual only, is directed against an individual, and may be difficult to pursue or collect if the seller is unsophisticated, located in another jurisdiction, or has limited assets. In transactions where the secondary purchase price is in the millions of dollars — entirely plausible for significant blocks of shares in leading AI companies — the financial consequences of a void transfer are severe and may not be recoverable.
Anthropic, like other high-value private AI companies including OpenAI, actively enforces its transfer restrictions and controls its shareholder base. It is publicly known that Anthropic monitors secondary activity in its shares and that unauthorized secondary transactions may not result in valid equity ownership. Buyers should treat company consent and ROFR clearance as prerequisites for any Anthropic secondary transaction.
Anthropic occupies a distinctive position in the current private market landscape: it is among the most valuable private companies in the world, is engaged in AI research and development that it considers mission-critical to manage carefully, and has strong structural reasons — including national security considerations given the nature of its work — to control its shareholder base with precision. Anthropic, like OpenAI and other high-profile private AI companies, has taken a clear and publicly known position that it manages secondary transactions in its shares and that transfers that do not go through the company's authorized transfer process — including proper ROFR notice, company consent, and cap table update — may not be recognized as valid by the company. This is consistent with the transfer restriction provisions standard in agreements governing equity in companies of this type. For prospective buyers of Anthropic shares on secondary platforms, the operative question is not whether the company is attractive — it clearly is — but whether the specific transaction being offered has been authorized by the company. A secondary listing or broker offering on a platform does not, by itself, constitute company authorization. The buyer must separately confirm that the company has consented to the specific transaction, that the ROFR process has been completed and documented, and that the company will update its records to reflect the buyer as a shareholder upon closing. Without that confirmation, the transaction carries meaningful risk that the company will not recognize the buyer's ownership.
Minimum due diligence includes: reviewing the shareholder agreement and ROFR/Co-Sale Agreement; confirming company consent is obtained or underway; confirming ROFR waiver documentation; verifying the seller's chain of title; and understanding what information rights (if any) attach to the shares being purchased.
The due diligence framework for secondary purchases in private companies should be more rigorous than most buyers currently employ. The minimum standard for a significant secondary transaction should cover: first, document review — the buyer should request and review the company's most recent ROFR/Co-Sale Agreement, the shareholder agreement, the certificate of incorporation, and any applicable equity plan documents. If the platform or seller cannot produce these documents, the buyer should not proceed. Second, company consent confirmation — the buyer should confirm, through a written consent letter or transfer approval letter from the company itself (not from the seller or the platform), that the company consents to the specific transaction. The consent must be specific to the transaction and must be signed by an authorized company representative. Third, ROFR waiver documentation — the buyer should request documentation showing that the ROFR process was properly triggered (notice delivered to all holders of ROFR rights) and properly completed (exercise window expired without exercise or formal waiver received). Fourth, chain of title — the buyer should verify the seller's ownership through a cap table entry, securities certificate, or legal opinion. If the shares passed through prior transfers, each link in the chain should be verified as authorized. Fifth, information rights — the buyer should understand that secondary purchases of common stock typically do not include access to financial statements, board materials, or the other information rights that preferred shareholders receive under an investor rights agreement. The buyer is purchasing economic exposure, not information access, unless specific information rights are negotiated as part of the transaction.
Key buyer protections include: seller representations on ownership and clear title; transfer restriction compliance representations; ROFR completion representations with documentation; company consent as a condition to closing; seller indemnification for breach; and representations that the shares are validly issued and not subject to undisclosed restrictions.
The secondary purchase agreement is the buyer's primary contractual protection against the risks described in this guide. The following provisions are essential for buyers in any material secondary transaction. First, ownership and clear title representations: the seller should represent that they are the registered and beneficial owner of the shares, that the shares are free and clear of all liens, pledges, encumbrances, and adverse claims, and that no other person has any right to the shares. Second, transfer restriction compliance representations: the seller should represent that the transfer of the shares to the buyer complies with all applicable restrictions in the company's certificate of incorporation, bylaws, shareholder agreement, and any other governing instrument. Third, ROFR process representations: the seller should represent that the right of first refusal process has been completed in accordance with the governing agreement — including that proper notice was delivered to all ROFR holders, that the exercise window has expired, and that no ROFR holder has exercised their right — and should attach copies of the ROFR notice and waiver as exhibits to the purchase agreement. Fourth, company consent as closing condition: the buyer's obligation to close should be conditioned on receipt of written company consent to the transfer. This provision allows the buyer to walk away, without penalty, if company consent is not obtained before the closing deadline. Fifth, indemnification: the seller should indemnify the buyer and hold it harmless from any losses, claims, or damages arising from any breach of the seller's representations, including all reasonable legal fees and expenses incurred in establishing or defending the buyer's ownership. Sixth, share validity representations: the seller should represent that the shares were originally issued by the company at the stated issuance date, that the shares are validly issued, fully paid, and non-assessable, and that the shares are not subject to any vesting schedule, repurchase right, or other contractual right that would diminish the buyer's ownership.
Secondary purchases work cleanly in: company-sponsored tender offers (company manages all authorization mechanics); directed transactions with explicit written company consent and ROFR documentation; and platform transactions covered by a pre-negotiated company framework agreement. Buyer-initiated purchases without company involvement carry material risk for shares in companies that actively enforce transfer restrictions.
Not all secondary transactions carry the same legal risk, and identifying the transaction structures that work cleanly from those that do not is the central practical question for prospective buyers. Company-sponsored tender offers represent the gold standard: the company organizes a liquidity program for its shareholders, determines the eligible participants and price, manages the ROFR mechanics (which may be waived by the company as part of the program design), and issues updated cap table entries to buyers who participate. National securities laws compliance is handled by the company. The buyer's risk of a void transfer is essentially zero in this structure. Directed secondary transactions with explicit company involvement are also safe when properly structured: the seller and buyer agree on terms, the ROFR process is triggered and documented, the company provides written consent to the specific buyer and transaction, and the company's transfer agent processes the transfer and updates the cap table. The company is a participant in the transaction from beginning to end. Platform transactions may be safe when the platform has negotiated a framework agreement with the company that covers the specific category of transaction being offered — the buyer should confirm specifically that the company's framework agreement covers the transaction in question and request documentation. The high-risk category — transactions initiated by buyers on secondary platforms without any company involvement or documentation — is exactly where buyers in leading AI company shares are most exposed. For a company like Anthropic that controls its shareholder base carefully, the probability that such a transaction will be recognized as valid without company participation is low. Buyers in that category are purchasing legal uncertainty at a premium price.
Gurpreet S. Bal is a corporate partner with 16 years advising on private equity, merger transactions, and public offerings for companies and investors at three of the world's top law firms. He has represented clients in hundreds of transactions with aggregate deal value exceeding $60 billion across AI, semiconductors, fintech, and emerging technology. For more information and to get in touch, visit gurpreetbal.com.