what is the best returning mid cap stock in the last 50 years

MDU Resources (MDU) has had the highest return between September 18, 1975 and September 18, 2025 by a mid-cap US stock, returning 3,169,900%.

ASSET DATE % RETURN
MDU Resources (MDU)
9/18/1975 - 9/18/2025
3,169,900%
Weatherford International (WFRD)
9/18/1975 - 9/18/2025
2,199,210.34%
Badger Meter (BMI)
9/18/1975 - 9/18/2025
2,055,495.24%
Inventrust Properties (IVT)
9/18/1975 - 9/18/2025
1,476,900%
Northern Oil & Gas (NOG)
9/18/1975 - 9/18/2025
994,900%
Polaris Industries (PII)
9/18/1975 - 9/18/2025
985,244.83%
Flowers Foods (FLO)
9/18/1975 - 9/18/2025
278,441.67%
Glacier Bancorp (GBCI)
9/18/1975 - 9/18/2025
261,910.87%
Dillard's (DDS)
9/18/1975 - 9/18/2025
166,404.61%
Argan (AGX)
9/18/1975 - 9/18/2025
151,719.91%
MSA Safety (MSA)
9/18/1975 - 9/18/2025
148,110.53%
AAON (AAON)
9/18/1975 - 9/18/2025
133,432.34%
HF Sinclair (DINO)
9/18/1975 - 9/18/2025
130,495.53%
Gap (GAP)
9/18/1975 - 9/18/2025
125,229.67%
RLI (RLI)
9/18/1975 - 9/18/2025
109,648.32%
WD-40 (WDFC)
9/18/1975 - 9/18/2025
102,439.87%
Hawkins (HWKN)
9/18/1975 - 9/18/2025
92,249.81%
H&R Block (HRB)
9/18/1975 - 9/18/2025
88,417.24%
Balchem (BCPC)
9/18/1975 - 9/18/2025
78,327.54%
Graham (GHC)
9/18/1975 - 9/18/2025
56,679.4%
Bio-Techne (TECH)
9/18/1975 - 9/18/2025
56,329.35%
Gentex (GNTX)
9/18/1975 - 9/18/2025
54,524.06%
Seaboard (SEB)
9/18/1975 - 9/18/2025
54,461%
McGrath RentCorp (MGRC)
9/18/1975 - 9/18/2025
48,868.29%
CVB Financial (CVBF)
9/18/1975 - 9/18/2025
48,678.05%
Mid-cap stocks are treated as having a market cap between $2B and $10B.