A public authority in Colorado issued municipal bonds to finance local improvements. Central Bank of Denver, N.A. served as the indenture trustee. Under the bond indenture, the bonds were to be secured by land whose appraised value was required to exceed a stated percentage of the outstanding principal, a protection designed to assure adequate collateral. During the life of the issue, Central Bank received information suggesting the original land appraisal may have been inflated and that the collateral might not satisfy the indenture's value-to-debt requirement. Although internal discussions raised concerns and an independent review was contemplated, Central Bank agreed to delay obtaining a new appraisal. The bonds later suffered losses, and purchasers—including First Interstate Bank of Denver, N.A.—sued under Section 10(b) of the Securities Exchange Act and SEC Rule 10b-5. The plaintiffs did not claim Central Bank itself made any material misstatement or engaged directly in a manipulative or deceptive scheme. Instead, they alleged the issuer, developer, and others committed primary violations by using inflated appraisals to mislead investors, and that Central Bank aided and abetted those violations by knowingly or recklessly delaying an independent appraisal and failing to act to protect bondholders. The district court dismissed; the Tenth Circuit reversed in relevant part, recognizing aiding-and-abetting liability under Rule 10b-5 based on substantial assistance to the primary fraud. The Supreme Court granted certiorari to resolve whether private plaintiffs may sue aiders and abettors under Section 10(b)/Rule 10b-5.
May a private plaintiff maintain an aiding-and-abetting action under Section 10(b) of the Securities Exchange Act of 1934 and SEC Rule 10b-5 against a defendant that did not itself commit a primary manipulative or deceptive act?
Section 10(b) makes it unlawful to use or employ, in connection with the purchase or sale of any security, any manipulative or deceptive device or contrivance in contravention of SEC rules. The implied private right of action under Section 10(b)/Rule 10b-5 extends only to primary violators who themselves engage in manipulative or deceptive conduct—such as making a material misstatement or omission with scienter or employing a deceptive scheme. The statute does not authorize private civil liability for aiding and abetting a Section 10(b) violation, and SEC rulemaking cannot create such liability beyond the statute's text.
No. Private plaintiffs may not bring aiding-and-abetting claims under Section 10(b) and Rule 10b-5. The implied private right of action covers only primary violations by those who themselves commit manipulative or deceptive acts.
The Court, per Justice Kennedy, began with the text of Section 10(b), which prohibits the use or employment of a manipulative or deceptive device or contrivance. The statutory language speaks to primary conduct—acts that are themselves manipulative or deceptive—rather than to secondary liability for those who assist another's violation. Congress knows how to impose aiding-and-abetting liability when it wishes and has done so explicitly in other statutes. Its silence in Section 10(b), coupled with the presence of other expressly delineated liability provisions in the Exchange Act (e.g., Section 20(a) controlling-person liability), demonstrates that courts should not infer additional forms of secondary liability. Because the private right of action under Rule 10b-5 is itself implied, the Court was especially reluctant to expand it beyond the statutory text. Precedents such as Blue Chip Stamps, Touche Ross, and Transamerica counsel judicial restraint in recognizing or enlarging implied rights of action. The SEC's Rule 10b-5, promulgated under Section 10(b), cannot create a cause of action for aiding and abetting that the statute does not authorize. Nor do policy arguments about the value of deterring fraud by reaching aiders and abettors justify judicially adding new categories of private liability. Applying these principles, the Court held that private plaintiffs must prove a primary violation by the defendant—such as making a false statement, omitting a material fact when under a duty to speak, or engaging in a deceptive course of conduct with scienter and the requisite connection to investor reliance. Mere inaction or assistance—such as delaying an appraisal—without an independent duty to disclose or an affirmative deceptive act, is not enough. The Court reversed the Tenth Circuit's recognition of aiding-and-abetting liability in private suits. The dissent, invoking decades of lower-court practice and investor protection concerns, would have preserved aiding-and-abetting liability; but the majority concluded that Congress, not the judiciary, must make that policy choice.
Central Bank of Denver sharply limited private securities fraud litigation by eliminating aiding-and-abetting liability under Section 10(b)/Rule 10b-5. After the decision, plaintiffs could no longer sue secondary actors simply for substantially assisting a primary fraud; they had to plead and prove that each defendant committed a primary manipulative or deceptive act with scienter and that investors relied on that act. Congress partially responded in the PSLRA of 1995 by authorizing the SEC (but not private plaintiffs) to bring aiding-and-abetting actions under Exchange Act Section 20(e)—authority later expanded by Dodd-Frank to include reckless assistance. The decision set the stage for later Supreme Court cases refining primary liability and the role of secondary actors, including Stoneridge (scheme liability and reliance), Janus (who "makes" a statement), and Lorenzo (primary liability for disseminating false statements). For law students, the case anchors modern 10b-5 doctrine on textual limits, the contours of primary versus secondary liability, and the judicial role in implied rights of action.
Central Bank of Denver marks a decisive turn toward textual limits in the federal securities laws. By holding that Section 10(b)/Rule 10b-5 does not permit private aiding-and-abetting suits, the Court confined private actions to primary violators and emphasized that the creation or expansion of secondary civil liability belongs to Congress.