S&P Dow Jones Indices announced October 28 that Huron Consulting Group will enter the S&P SmallCap 600 before trading opens November 3, one day later than previously scheduled.
Huron will replace Supernus Pharmaceuticals. The index provider had announced a November 2 effective date on October 22 and said the revision follows a special-dividend ex-date announcement related to a pending merger.
Indivior Pharmaceuticals, which is already an index constituent, is acquiring Supernus Pharmaceuticals. Completion remains subject to final closing conditions, according to the index announcement.
After the merger, Indivior is expected to take the name Supernus Inc. and trade under the symbol SUPN while remaining in the index. Huron will join under its HURN symbol and the Industrials sector classification.
The October 28 development changes the implementation date of an already announced index addition. It does not mean Huron entered the index immediately or that the merger has already closed.
Sources S&P Dow Jones Indices revised effective-date announcement, October 28, 2026.