Applied Opt (AAOI) had the highest return on February 27 by a mid-cap US stock, returning 27.8%.

ASSET	DATE	% RETURN
Applied Opt (AAOI)	2/27/2026	27.76%
Baldwin Insurance (BWIN)	2/27/2026	15.17%
BillionToOne, Inc Class A Common Stock (BLLN)	2/27/2026	10.29%
DoubleVerify (DV)	2/27/2026	10.25%
BioCryst Pharmaceuticals (BCRX)	2/27/2026	10.06%
Duolingo (DUOL)	2/27/2026	9.47%
TransMedics (TMDX)	2/27/2026	8.99%
Accelerant (ARX)	2/27/2026	8.36%
Veradermics (MANE)	2/27/2026	7.68%
Westlake Chemical (WLK)	2/27/2026	7.31%
Iridium Communications (IRDM)	2/27/2026	7.25%
Ultra Clean (UCTT)	2/27/2026	7.02%
10X Genomics (TXG)	2/27/2026	6.81%
Bill Com (BILL)	2/27/2026	6.69%
Encore Capital (ECPG)	2/27/2026	6.57%
Relay Therapeutics (RLAY)	2/27/2026	6.43%
SM Energy (SM)	2/27/2026	6.39%
NewAmsterdam Pharma Company NV Ordinary Shares (NAMS)	2/27/2026	6.14%
Acadia Healthcare (ACHC)	2/27/2026	6.06%
Figs (FIGS)	2/27/2026	6.04%
Lifestance Health (LFST)	2/27/2026	6%
Crescent Energy (CRGY)	2/27/2026	6%
McGraw Hill (MH)	2/27/2026	5.58%
Aya Gold & Silver Inc Common Shares (AYA)	2/27/2026	5.51%
CG Oncology, Inc Common stock (CGON)	2/27/2026	5.4%

Mid-cap stocks are treated as having a market cap between $2B and $10B.