What is insider trading in the context of private companies?

Defining Insider Trading Beyond Public Markets: The Private Company Reality

When discussing insider trading private company employees, the most common misconception is that it’s a public-market-only offense. This is dangerously incorrect. The prohibition stems from Section 10(b) of the Securities Exchange Act of 1934 and SEC Rule 10b-5, which are not limited by a company’s registration status. The law prohibits fraud “in connection with the purchase or sale of any security.” Private company equity—founder shares, employee stock options, SAFEs, and preferred stock—are unequivocally “securities” under the law.

Why this matters: The legal risk isn’t hypothetical. While the SEC’s enforcement headlines feature public companies, private companies are not a free-for-all. The core violation is the same: trading a security while in possession of material nonpublic information in breach of a duty of trust. The enforcement mechanism, however, shifts dramatically. For public companies, the SEC is the primary cop. For private firms, enforcement often originates from disgruntled investors or co-founders through civil litigation for breach of fiduciary duty insider trading or fraud. A startup employee who exercises options knowing the company is about to miss a major product launch milestone, thereby tanking its valuation ahead of a tender offer, has engaged in classic insider trading. The victim is the counterparty to the trade—often the company itself or other shareholders.

How it works in real life: The duty triggering liability in private settings is typically a fiduciary duty or a duty of confidentiality. Key personnel (executives, board members) owe fiduciary duties of care and loyalty to the company and its shareholders. An employee with access to sensitive information may have a contractual duty via an NDA or an IP agreement. Trading on that information constitutes a breach. Unlike public markets, there’s no centralized “market” to protect, but the fraud is on the counterparty. For example, a founder selling secondary shares to a new investor during a funding round, while knowingly concealing that a key patent application was just rejected, commits securities fraud. The investor purchased a security based on a misleadingly incomplete picture.

What 99% of articles miss: They frame insider trading as an “SEC vs. Wall Street” issue, ignoring the potent role of state law. While federal Rule 10b-5 applies, plaintiffs in private company disputes frequently bring parallel claims under state common law for fraud and breach of fiduciary duty. These claims can be easier to prove and may offer different remedies. Furthermore, the entire tipper-tippee liability doctrine applies. A board member (“tipper”) who confidentially tells a friend (“tippee”) about an impending, down-round financing can create liability for both if the friend trades on that info. The complexity of private cap tables and the opacity of secondary transactions (e.g., on platforms like Forge or EquityZen) create fertile ground for such violations to go temporarily unnoticed, but not unpunishable.

The foundational principle is that the legal architecture for insider trading does not distinguish between public and private securities. The distinction lies in the triggers for materiality, the liquidity of the market, and the primary enforcers. Understanding this shifts the focus from “Is this regulated?” to “Who holds the duty, and who is defrauded?” For a deeper dive into the legal duties that underpin these rules, see our analysis of fiduciary duties of directors and officers.

Material Nonpublic Information in Private Companies: Redefining the Threshold

In a public company, materiality is often judged by a stock price’s probable reaction. In a private company, with no daily market quote, the material nonpublic information definition transforms. It becomes any information a reasonable investor would consider important in making an investment decision regarding the company’s private securities. This is a more holistic, narrative-driven assessment.

Why this matters: Employees and founders of private companies routinely possess information that would be undisputedly material if the company were public, yet they operate without the formalized “blackout periods” and compliance programs of a listed entity. This creates a minefield of inadvertent violations. The materiality threshold is not lower for private companies; it’s simply measured by different, often more significant, milestone events.

How it works in real life: MNI in a private context is almost always tied to a liquidity event or a valuation inflection point. Concrete examples include:

• Financing Rounds: Advanced term sheet negotiations, specific valuation caps for a new round, or the fact that a lead investor has pulled out.
• M&A Discussions: Any substantive talks regarding an acquisition, even preliminary ones, especially with price or structure discussed.
• Key Operational Metrics: A drastic, unreported miss or exceedance of burn rate, customer churn, or product launch timelines that would fundamentally alter the company’s runway or growth story.
• Regulatory Milestones: For a biotech startup, preliminary FDA feedback; for a fintech, a critical regulatory approval or denial.
• Intellectual Property: The grant, denial, or material challenge to a core patent, or the outcome of a critical trade secret litigation.
• Senior Personnel Changes: The unannounced departure of the CEO or key technical founder, or a major C-suite hiring.

What 99% of articles miss: They fail to highlight the most counterintuitive and risky aspect: materiality is often judged in hindsight during litigation or an SEC investigation. An employee might not think a piece of information is “material.” However, if that information later emerges as the reason a funding round was canceled or repriced, a court will retroactively deem it material. Furthermore, the “nonpublic” element is stricter in private markets. In public markets, information is public once a Form 8-K is filed. In private markets, there is no official disclosure mechanism. Information shared haphazardly in a Slack channel or at an all-hands meeting may still be deemed nonpublic if the audience is limited to employees who owe duties to the company.

The practical safeguard for private company insiders is not a complex legal test, but a simple heuristic: if the information would significantly change the story you’d tell to a potential investor, acquirer, or employee considering an option grant, it is likely material. Trading—or advising others to trade—on that information before it is formally and broadly communicated to all stakeholders is the core of the violation. For companies navigating the private fundraising landscape, understanding these disclosure obligations is critical, as outlined in our guide to legal disclosures required when raising capital.

Examples of Material vs. Non-Material Information in Private Companies

Likely MATERIAL (Actionable)	Likely NON-MATERIAL (Non-Actionable)
A signed term sheet for a Series B at a 2x increased valuation.	General market trends in your industry.
Loss of a single customer that constitutes 40% of annual recurring revenue (ARR).	Loss of a single customer that constitutes 0.5% of ARR.
Final, unannounced decision to accept an acquisition offer.	Preliminary, exploratory phone call from a potential acquirer with no terms discussed.
Core patent infringement lawsuit filed against the company.	Routine, non-substantive office action on a peripheral patent application.
CFO has resigned after discovering a major accounting irregularity.	CFO is taking a planned two-week vacation.

The Central Role of Fiduciary Duty: The Unseen Engine of Private Enforcement

When discussing insider trading private company employees, most analyses jump straight to federal securities law. This misses the core engine of enforcement in the private sphere. For public companies, the SEC’s Rule 10b-5 provides a direct, federal cause of action. Private companies, however, operate in a different universe. The primary legal theory isn’t a federal registration violation; it’s a breach of fiduciary duty insider trading. This distinction isn’t academic—it fundamentally reshapes who can sue, the standard of proof, and the strategic calculus of every case.

Why This Matters: Fiduciary duty acts as the linchpin because it translates ethical obligations into enforceable legal claims without requiring SEC registration. Directors, officers, and controlling shareholders of private companies owe duties of care and loyalty to the company and its shareholders. Trading on confidential information for personal gain is a textbook breach of loyalty. This creates a private right of action for the company or its shareholders under state law, most notably in the Delaware Court of Chancery, which specializes in corporate governance. While the SEC can still pursue fraud under Section 10(b) if the transaction involves a security and interstate commerce, the day-to-day enforcement mechanism is overwhelmingly civil litigation based on fiduciary breach.

How It Works in Real Life: Imagine a private Series C startup. The CFO, privy to imminent, disappointing audit results, liquidates her secondary market shares to an unsuspecting buyer before the news leaks. The SEC may lack a clear hook if the trade was on a small, private platform. However, the company’s other shareholders can file a derivative suit alleging the CFO breached her fiduciary duty of loyalty by misusing corporate property (the confidential information) for personal gain. The case proceeds in state court, focusing on internal corporate fairness rather than technical securities regulations. Remedies often include disgorgement of profits and can be severe, impacting an individual’s stake in the company far more than an SEC fine might.

What 99% of Articles Miss: The strategic implications of this fiduciary framework are profound. It shifts power from regulators to private litigants—often sophisticated venture capital firms or large common shareholders. This leads to quicker, quieter settlements to avoid discovery and reputational damage. Furthermore, the definition of “corporate property” in the form of material nonpublic information definition can be broader in a fiduciary duty context, potentially encompassing operational data, key hire departures, or product roadmap shifts that wouldn’t necessarily move a public stock price but directly impact the valuation of a private firm. It also creates a pathway for liability even in the absence of a formal “trade,” such as using confidential information to guide a personal investment in a competitor.

For a foundational understanding of these legal duties, see our guide on director fiduciary duties of care and loyalty.

Who Qualifies as an Insider? Liability Beyond the Corner Office

The term “insider” conjures images of CEOs and board members. In private companies, the net of liability is cast much wider, ensnaring a diverse range of individuals who may never think of themselves as market actors. Understanding who qualifies is less about title and more about access and relationship.

Why This Matters: The explosion of secondary markets for private stock (e.g., Forge, EquityZen) has democratized liquidity for early employees. This also democratizes risk. A mid-level engineer with access to the core code repository, a sales operations manager seeing pipeline collapse, or an admin who prepares board decks all possess information that could be material. Their liability doesn’t stem from a formal fiduciary duty insider trading obligation (unless they are officers) but from other legal theories like misappropriation or participation in a breach of trust.

How It Works in Real Life: Liability hinges on two interconnected concepts: possession of material nonpublic information definition and a duty to refrain from trading on it. This duty can arise from:

• Employment Agreements & NDAs: Standard confidentiality clauses explicitly forbid using company information for personal benefit.
• The “Temporary Insider” Doctrine: Consultants, lawyers, or bankers brought in for a specific project (e.g., a fundraising round) become “temporary insiders” and owe a duty of trust to the company.
• Misappropriation Theory: An employee who steals confidential information to trade breaches a duty to the source of the information (the company), even if they owe no duty to the trading counterparty.

The mosaic theory—where non-material pieces of information are combined to form a material picture—is particularly potent in private settings. An engineer might know a product launch is delayed; a salesperson might know a key client is unhappy. Independently, each fact may be insignificant. Shared between friends who both trade, it can create liability.

What 99% of Articles Miss: Enforcement targeting is increasingly behavioral and data-driven. Regulators and plaintiffs’ lawyers monitor secondary market trading platforms for anomalies, especially in the run-up to known liquidity events like tender offers or SPAC mergers. They look for patterns: clusters of trades from a single geographic area (e.g., near company headquarters) or from accounts linked to employees in a specific department. The highest risk period for insider trading private company employees isn’t during daily operations—it’s during these infrequent, high-stakes liquidity windows when information asymmetries are greatest and the temptation to cash out is highest.

For more on the agreements that establish these duties, review the essentials of a non-disclosure agreement (NDA).

Tipper-Tippee Liability: The Contagion of Confidential Information

In a private company, information doesn’t exist in a vacuum. It flows through closed networks—founder groups, former colleague cohorts, investor syndicates. This is where tipper-tippee liability transforms a single breach into a chain of violations, creating what is often the most significant and overlooked risk for otherwise compliant individuals.

Why This Matters: You don’t need to trade to be liable. Simply disclosing material nonpublic information in breach of a duty can make you a “tipper,” liable for the downstream trades of your “tippees.” In the close-knit world of private tech, where information is currency and networking is essential, a casual conversation can have catastrophic legal consequences.

How It Works in Real Life: The legal test established by the Supreme Court requires: (1) a personal benefit to the tipper, and (2) knowledge by the tippee that the disclosure was wrongful. In private company scenarios, the “personal benefit” is interpreted broadly. It can be:

• Tangible: A cut of the trading profits, a reciprocal tip, or a business favor.
• Intangible: The benefit of making a gift to a friend or relative, enhancing a reputation as a well-connected insider, or solidifying a valuable relationship.

A founder telling a trusted angel investor about an upcoming down round to give them a “heads up” can satisfy the personal benefit test. That investor then trading, or even passing the tip to a close friend who trades, triggers liability for both the founder (tipper) and the investor (tippee).

What 99% of Articles Miss: The most dangerous vector for tipper-tippee liability in private markets isn’t explicit fraud; it’s the culture of selective transparency. Sharing “bad news” with a sympathetic confidant or “good news” with a potential hire to woo them can be recast as providing a personal benefit. Furthermore, tippee liability is strict. A tippee can be liable even if the tipper isn’t prosecuted, and they don’t need to know the exact nature of the tipper’s breach—only that the information was conveyed improperly.

This creates a compliance nightmare for companies considering SEC Rule 10b5-1 plans. While these pre-planned trading programs are a defense for public company executives, they are virtually non-existent in private markets due to the lack of regular, planned liquidity. The absence of such structured safe harbors places the entire onus on individuals to police informal communications.

For businesses structuring their internal governance to mitigate these risks, understanding corporate governance frameworks is critical.

Tipper-Tippee Liability: The Silent Threat in Tight-Knit Private Networks

In public markets, the chain of information from an insider to an outside trader can be long and complex. In private companies, especially startups, this chain is often shockingly short and personal. The legal doctrine of tipper-tippee liability transforms casual conversations into severe legal jeopardy because it does not require the insider to personally trade or profit. Liability hinges on breaching a fiduciary duty by disclosing material nonpublic information (MNI) as a “gift”—even just to build a friendship—and the tippee knowing or having reason to know of the breach.

Why this matters: The culture of collaboration and informal networking in private ecosystems directly conflicts with the strict logic of securities law. A founder confiding in a trusted advisor, an engineer sharing a product breakthrough with a former colleague at another firm, or an employee hinting at an upcoming funding round to a friend looking for a job—all are potential tipper-tippee violations. The systemic effect is the creation of an uneven information field that corrupts the integrity of private capital formation, which relies on trust and fair dealing.

How it works in real life: The SEC and DOJ have become adept at mapping these intimate information networks. In a notable case, the SEC charged an executive at a private unicorn and his close friend, who traded on secondary markets based on confidential information about the company’s financial performance and acquisition talks (SEC Litigation Release No. 25022). The enforcement action traced texts and calls, proving the executive shared the information as a personal benefit to his friend. For beginners, the stark warning is: never share confidential company data outside authorized channels, regardless of the relationship or your intent.

What 99% of articles miss: The investigation of non-obvious tippee relationships. Enforcement doesn’t stop at the first-degree contact. Regulators will pursue the “remote tippee”—the person who receives the information second- or third-hand. In private markets, this often involves tracing information through investor networks, shared service providers (like law or accounting firms), or even family offices. The legal standard of “reason to know” the information was improperly disclosed can be met more easily in these close-knit circles where the source of a hot tip is often an identifiable insider.

Actionable Patterns for Compliance

• Assume All Communications Are Permanent: Treat Slack, Signal, and even verbal “off-the-record” chats as potentially discoverable. The personal benefit to a tipper can be inferred from the nature of the relationship.
• Extend Training Beyond C-Suite: Any employee with access to operational, financial, or strategic data—from product managers to key sales staff—can be a tipper. Training must be company-wide.
• Monitor Pre-Event Trading: For companies nearing a liquidity event, unexplained trading activity on secondary platforms like Forge or SharesPost can be a red flag prompting an internal investigation into potential information leaks.

SEC Rule 10b5-1 Plans: A Public Market Tool Useless for Most Private Employees

SEC Rule 10b5-1 plans are often cited as a gold standard for legal, pre-planned trading. For employees of public companies, they provide an affirmative defense against insider trading allegations by establishing the trading plan before the insider possesses MNI. For private company personnel, they are largely a mirage.

Why this matters: The pervasive myth that a 10b5-1 plan is a viable compliance path creates a false sense of security for private company employees holding illiquid stock. The rule is fundamentally designed for liquid, publicly traded securities with established market prices and trading windows. In a private company, the very act of selling shares is often a discrete, negotiated event that itself constitutes MNI, nullifying the plan’s core premise.

How it works in real life: Implementing a 10b5-1 plan requires specifying amounts, prices, and dates of future trades. For a private company employee, these variables are impossible to define. There is no public market price. A sale typically requires board approval, finding a buyer, and negotiating a price—each step revealing or being influenced by nonpublic information. Attempting to craft such a plan is legally futile and can be seen as evidence of bad faith if challenged.

What 99% of articles miss: The legal void for pre-trading arrangements in private markets and the emerging, practical workarounds. Since 10b5-1 plans don’t function, sophisticated private companies are creating internal structured liquidity programs. These are not SEC-sanctioned defenses but robust internal controls:

Realistic Alternative	Mechanism	Key Safeguard
Pre-Clearance Protocol	Mandatory internal review and approval for any share transfer request, assessing the requester’s potential access to MNI.	Creates a documented, consistent process that can demonstrate the company’s good-faith effort to prevent violations.
Company-Facilitated Tender Offers	The company organizes occasional, broad-based liquidity events where all eligible shareholders can sell a limited percentage of shares under uniform terms.	Minimizes the information asymmetry of one-off deals and provides a controlled, fair exit path, reducing temptation for illicit trades.
Enhanced Insider Trading Policies	Policies that explicitly govern transactions in secondary markets and define blackout periods around known material events (e.g., fundraising rounds, M&A talks).	Clarifies that insider trading rules apply with full force to private share sales, a point often misunderstood by employees.

Emerging Frontiers: SPACs, Secondary Markets, and Digital Assets

The landscape for insider trading private company employees face is no longer confined to traditional venture rounds. New financial structures have created novel risk zones where MNI is abundant but regulatory application is tested.

Why this matters: The democratization of private investing through special purpose acquisition companies (SPACs), the growth of pre-IPO secondary markets, and the rise of digital asset token sales have blurred the lines between public and private. Each presents a moment where confidential corporate information holds immense value, yet participants may wrongly assume the relaxed disclosure rules of a private company equate to relaxed insider trading enforcement.

How it works in real life:

1. Pre-IPO Secondary Markets: Platforms facilitating trades of private shares are hotbeds for MNI. An employee knowing of an impending poor earnings quarter or a delayed IPO can sell their shares on these platforms to an unaware buyer. The SEC has brought cases in this exact scenario, treating these secondary market transactions as securities trades subject to Rule 10b-5.
2. SPAC Mergers (de-SPAC Transactions): When a private company agrees to merge with a SPAC, it enters a critical period. Insiders of the private target company possess MNI about the deal and the company’s prospects. Trading in the SPAC’s public securities (its stock or warrants) based on that information constitutes illegal insider trading, as multiple SEC actions have confirmed.
3. Digital Asset Token Sales: The SEC has consistently argued that many tokens are investment contracts, and thus securities. Developers, early team members, and large holders (“whales”) with nonpublic knowledge about a project’s development, exchange listings, or treasury actions who trade tokens may face tipper-tippee liability claims. The pseudo-anonymous nature of blockchain does not shield them; forensic chain analysis is a standard tool for regulators.

What 99% of articles miss: The enforcement priorities and regulatory gaps in these areas. For experts, the critical insight is that the SEC is applying traditional insider trading doctrines aggressively to these new frontiers, but with strategic focus. They are prioritizing cases that:

• Involve clear, provable personal monetary gain.
• Have a nexus to U.S. markets or investors.
• Serve as a deterrent message to a nascent industry (e.g., crypto).

The sophisticated risk is not just legal, but reputational. A startup pursuing a SPAC merger or a token project facing insider trading allegations can see its valuation crater and its ability to secure future capital vanish overnight. Compliance in these modern structures isn’t an afterthought; it’s a prerequisite for credible participation in the market.