NEW YORK, Nov. 13, 2026 /PRNewswire/ — Chime Financial Inc. (NASD: CHYM) will replace NorthWestern Energy Group Inc. (NASD: NWE) in the S&P MidCap 400 effective prior to the opening of trading on Wednesday, November 18. S&P MidCap 400 constituent Black Hills Corp. (NYSE: BKH) is acquiring NorthWestern Energy Group in a deal expected to be completed today. Post-merger, the combined company will remain in the S&P MidCap 400 and will be renamed Bright Horizon Energy Corp. (NYSE: HZN).
Following is a summary of the changes that will take place prior to the open of trading on the effective date:
|
Effective Date |
Index Name |
Action |
Company Name |
Ticker |
GICS Sector |
|
November 18, 2026 |
S&P MidCap 400 |
Addition |
Chime Financial |
CHYM |
Financials |
|
November 18, 2026 |
S&P MidCap 400 |
Deletion |
NorthWestern Energy Group |
NWE |
Utilities |
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