Lewis v. Bt Investment Managers, Inc.

447 U.S. 27 · Decided June 9, 1980 · Supreme Court of the United States

At a glance

Lewis v. Bt Investment Managers, Inc. was decided on June 9, 1980 unanimously (9–0). The Court affirmed the lower court's decision in part, reversed or vacated it in part, and remanded the case. Justice Harry A. Blackmun wrote the opinion of the Court. SCDB classifies its main issue as “State or local business regulation” in the Economic Activity area. SCDB records that the Court declared a state or territorial law, regulation or constitutional provision unconstitutional.

Read the opinion

• CourtListener (Free Law Project) — opinion text
• Library of Congress — official U.S. Reports scan

Case details

How the Justices voted

Full case caption

Lewis, Comptroller of Florida v. Bt Investment Managers, Inc., et al.

SCDB identifiers: case 1979-105, docket 1979-105-01.

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Cases on the same legal provision: Article I, Section 8, Paragraph 3 (interstate commerce clause)

• Western & Southern Life Insurance Co. v. State Board of Equalization of California
  451 U.S. 648Decided May 26, 19817–2William J. Brennan Jr.
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  451 U.S. 725Decided May 26, 19817–1Byron R. White
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  453 U.S. 609Decided July 2, 19816–3Thurgood Marshall
• Japan Line, Ltd. v. County of Los AngelesLaw held unconstitutional
  441 U.S. 434Decided April 30, 19798–1Harry A. Blackmun
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• Merrion v. Jicarilla Apache Tribe
  455 U.S. 130Decided January 25, 19826–3Thurgood Marshall

Same Term, same area (Economic Activity)

• Transamerica Mortgage Advisors, Inc. v. Lewis
  444 U.S. 11Decided November 13, 19795–4Potter Stewart
• P. C. Pfeiffer Co., Inc. v. Ford
  444 U.S. 69Decided November 27, 19799–0Lewis F. Powell Jr.
• United States v. Kubrick
  444 U.S. 111Decided November 28, 19796–3Byron R. White
• Ferri v. Ackerman
  444 U.S. 193Decided December 4, 19799–0John Paul Stevens
• McLain v. Real Estate Board of New Orleans, Inc.
  444 U.S. 232Decided January 8, 19808–0Warren E. Burger
• Hatzlachh Supply Co., Inc. v. United States
  444 U.S. 460Decided January 21, 19808–1Per curiam

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Source: Supreme Court Database, 2026 Release 01 (data file dated September 8, 2026). Imported into CaseTrail November 5, 2026. Coverage: decisions from the 1946 through 2025 Terms. Methodology · Report an error