PTSI p.a.m. transportation services, inc. NASDAQ Trucking Freight/Courier Services SAIA saia, inc. NASDAQ Trucking Freight/Courier Services ULH universal logistics holdings, inc. NASDAQ Trucking Freight/Courier Services WERN werner enterprises, inc. NASDAQ Trucking Freight/Courier Services ARTNA artesian resources corporation - class a non-voting NASDAQ Water Supply CDZI cadiz, inc. NASDAQ Water Supply CWCO consolidated water co. ltd. - ordinary shares NASDAQ Water Supply GWRS global water resources, inc. - common stock NASDAQ Water Supply MSEX middlesex water company NASDAQ Water Supply MYRG myr group, inc. NASDAQ Water Supply PCYO pure cycle corporation NASDAQ Water Supply PLPC preformed line products company NASDAQ Water Supply PRIM primoris services corporation NASDAQ Water Supply YORW the york water company NASDAQ Water Supply