best performing mid cap stocks 2026 week

Xanadu Quantum Technologies Limited Class B Subordinate Voting Shares (XNDU) had the best week this year by a mid-cap US stock the week of April 13, 2026, returning 221.6%.

ASSETWEEK% RETURN
Xanadu Quantum Technologies Limited Class B Subordinate Voting Shares (XNDU)
4/13/2026 - 4/19/2026
221.62%
P3 Health Partners (PIII)
5/11/2026 - 5/17/2026
204.31%
Immunitybio (IBRX)
1/12/2026 - 1/18/2026
135.9%
MaxLinear (MXL)
4/20/2026 - 4/26/2026
127.62%
Alumis (ALMS)
1/5/2026 - 1/11/2026
119.78%
Fluence Energy (FLNC)
5/4/2026 - 5/10/2026
101.33%
Crinetics Pharmaceuticals (CRNX)
7/6/2026 - 7/12/2026
98.86%
agilon health (AGL)
5/4/2026 - 5/10/2026
96.63%
Nektar Therapeutics (NKTR)
2/9/2026 - 2/15/2026
93.41%
Innodata (INOD)
5/4/2026 - 5/10/2026
91.19%
Regencell Bioscience (RGC)
1/5/2026 - 1/11/2026
89.45%
Erasca (ERAS)
1/5/2026 - 1/11/2026
89.36%
Hemab Therapeutics Holdings, Inc Common Stock (COAG)
4/27/2026 - 5/3/2026
88.89%
Bandwidth (BAND)
4/27/2026 - 5/3/2026
86.68%
Maase (MAAS)
4/13/2026 - 4/19/2026
83.58%
agilon health (AGL)
4/6/2026 - 4/12/2026
77.09%
Avis Budget (CAR)
4/13/2026 - 4/19/2026
71.48%
SL Science Holding Limited Ordinary Shares (SLBT)
6/29/2026 - 7/5/2026
68.26%
Uniqure (QURE)
6/15/2026 - 6/21/2026
66.81%
Applied Opt (AAOI)
2/23/2026 - 3/1/2026
66.73%
Liberty Global PLC Class B (LBTYB)
2/2/2026 - 2/8/2026
66.14%
Enliven Therapeutics (ELVN)
1/5/2026 - 1/11/2026
65.71%
Avis Budget (CAR)
4/6/2026 - 4/12/2026
64.08%
Kodiak Sciences (KOD)
3/23/2026 - 3/29/2026
62.64%
Kailera Therapeutics, Inc Common Stock (KLRA)
4/13/2026 - 4/19/2026
62.5%
Mid-cap stocks are treated as having a market cap between $2B and $10B.