Insider Trading (Section 10(b), Exchange Act; Rule 10b-5): Trading in a security while in possession of material non-public information (MNPI) in breach of a duty of trust or confidence owed to the issuer, its shareholders, or the source of the information. "Material" information is information that a reasonable investor would consider important in making an investment decision, or that would have a substantial likelihood of significantly altering the total mix of available information. "Non-public" information is information that has not been disseminated to the general public in a manner making it generally available.
The SEC's Six-Step Insider Trading Investigation Workflow
The SEC's insider trading investigations follow a remarkably consistent pattern. Understanding this workflow is essential for issuers designing compliance programs and for individuals who believe they may be under investigation.
Market Surveillance Trigger
The SEC's Market Abuse Unit uses sophisticated surveillance technology to identify unusual trading patterns — abnormal volume spikes, options activity, or price movements immediately before material announcements. FINRA's surveillance systems also flag suspicious trades and refer them to the SEC. A single trade of unusual size or timing can trigger a formal investigation.
Formal Order of Investigation
The SEC staff issues a Formal Order of Investigation, which authorizes the use of subpoenas to compel testimony and document production. The subject of the investigation typically does not know a formal order has been issued until they receive a subpoena. At this stage, the SEC has already conducted preliminary analysis and has identified specific trading patterns it believes warrant investigation.
Brokerage Records Subpoenas
The SEC subpoenas brokerage records for all accounts that traded the security in question during the relevant period. This includes account holder identity, trading history, account funding sources, and communications. The SEC cross-references trading accounts against the issuer's employee, contractor, and advisor lists to identify potential access to material non-public information.
Communications Analysis
The SEC subpoenas phone records, email records, text messages, and social media communications. The SEC's ability to obtain communications data has expanded significantly — the Commission can now subpoena records from telecommunications carriers, email providers, and social media platforms. The SEC looks for communications between traders and potential insiders in the period immediately before the material announcement.
Witness Interviews and Testimony
The SEC staff conducts sworn testimony sessions with witnesses, typically starting with peripheral witnesses and working toward the primary subjects. Witnesses are required to testify under oath and can be charged with obstruction or perjury for false statements. The SEC uses testimony to establish the chain of information flow — who knew what, when, and who they told.
Enforcement Action or Referral
Based on the investigation, the SEC staff either recommends an enforcement action (civil charges) or refers the matter to the Department of Justice for criminal prosecution. The SEC can bring both civil and criminal charges simultaneously. Civil penalties include disgorgement of profits, prejudgment interest, and civil penalties of up to three times the profit gained or loss avoided.
Four Theories of Insider Trading Liability
Classical Theory
Section 10(b) and Rule 10b-5A corporate insider (officer, director, or employee) who trades on material non-public information obtained in the course of their employment breaches a fiduciary duty to the issuer's shareholders. The classical theory requires: (1) a fiduciary relationship between the trader and the issuer; (2) material non-public information; (3) trading while in possession of that information; and (4) scienter (intent to defraud).
Misappropriation Theory
Section 10(b) and Rule 10b-5An outsider who misappropriates material non-public information from a source to whom they owe a duty of trust and confidence, and trades on that information, violates Section 10(b). The misappropriation theory extends insider trading liability to corporate outsiders — attorneys, accountants, consultants, and others who obtain MNPI through their professional relationships.
Tipper-Tippee Liability
Dirks v. SEC, 463 U.S. 646 (1983)A tipper who discloses MNPI to a tippee is liable if the tipper breached a fiduciary duty and received a personal benefit from the disclosure. The tippee is liable if they knew or should have known that the tipper breached a duty. The Supreme Court's 2016 decision in Salman v. United States clarified that a gift of information to a trading relative or friend constitutes a personal benefit sufficient to establish tipper liability.
Rule 10b5-1 Plans
17 C.F.R. § 240.10b5-1Rule 10b5-1 provides an affirmative defense for trades made pursuant to a written plan established when the trader was not aware of MNPI. However, the SEC has brought enforcement actions against insiders who established 10b5-1 plans while in possession of MNPI, modified plans shortly before material announcements, or used plans as a pretext for opportunistic trading. The SEC adopted amendments in 2023 to strengthen 10b5-1 plan requirements.
Landmark Insider Trading Enforcement Actions
SEC v. Raj Rajaratnam / Galleon Group
SEC ReleaseThe Galleon case is the largest hedge fund insider trading case in history. The SEC and DOJ charged Raj Rajaratnam and numerous co-conspirators with trading on MNPI obtained from corporate insiders at multiple companies. The case was notable for the SEC's use of wiretap evidence — the first time wiretaps were used in an SEC insider trading investigation. Rajaratnam was convicted and sentenced to 11 years in prison, and the case resulted in over $150 million in disgorgement and penalties.
SEC v. Mark Cuban
SEC ReleaseThe SEC charged Mark Cuban with insider trading for selling his stake in Mamma.com after receiving confidential information about a planned PIPE offering. The case raised important questions about the misappropriation theory — specifically, whether a person who receives confidential information and agrees to keep it confidential thereby assumes a duty not to trade. Cuban was ultimately acquitted at trial, but the case established important precedent on the scope of confidentiality agreements as a basis for insider trading liability.
United States v. Martoma
SEC ReleaseThe Martoma case involved a hedge fund portfolio manager who obtained MNPI from a physician consultant about clinical trial results for an Alzheimer's drug. The case resulted in the largest single-trader insider trading profit in history — approximately $276 million in gains and avoided losses. Martoma was convicted and sentenced to 9 years in prison. The case demonstrates the SEC's ability to pursue insider trading schemes involving complex networks of consultants and expert networks.
Frequently Asked Questions
How does the SEC detect insider trading?
The SEC's Market Abuse Unit uses sophisticated surveillance technology to identify unusual trading patterns — abnormal volume spikes, options activity, or price movements immediately before material announcements. FINRA's surveillance systems also flag suspicious trades and refer them to the SEC. The SEC cross-references trading accounts against issuer employee and advisor lists, subpoenas brokerage records and communications, and conducts sworn testimony sessions to establish the chain of information flow.
What is material non-public information (MNPI)?
Material information is information that a reasonable investor would consider important in making an investment decision, or that would have a substantial likelihood of significantly altering the total mix of available information. Examples include unannounced earnings results, pending mergers or acquisitions, major contract wins or losses, and significant regulatory approvals or rejections. Non-public information is information that has not been disseminated to the general public in a manner making it generally available.
Can I trade on information I received from a friend?
Potentially not. Under the tipper-tippee theory established in Dirks v. SEC and clarified in Salman v. United States, a tippee who receives MNPI from a tipper who breached a fiduciary duty is liable if the tippee knew or should have known about the breach. If a friend who works at a company tells you about an unannounced merger before trading, both you and your friend may be liable for insider trading.
Does a 10b5-1 plan protect me from insider trading liability?
A properly established Rule 10b5-1 plan provides an affirmative defense, but only if the plan was established when you were not aware of MNPI, the plan specifies the amount, price, and timing of trades in advance, and you did not exercise any subsequent influence over the trades. The SEC has brought enforcement actions against insiders who established plans while in possession of MNPI, modified plans shortly before material announcements, or used plans as a pretext for opportunistic trading.
Protect Your Company and Yourself
Frederick M. Lehrer has prosecuted insider trading cases from the SEC's perspective and now advises issuers and individuals on compliance programs, trading window policies, and 10b5-1 plan structuring.
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