CSV is not Excel!!
As for the data, if its all in that format, then read line, and retain the variables, something like:
data want;
infile "have.csv" dlm=",";
length company exchange ticker duns buff $200;
retain company exchange ticker duns;
input buff $;
if index(buff,":") then do;
exchange=scan(buff,1,":");
ticker=scan(buff,2,":");
end;
else if substr(buff,1,4)="D-U-" then do;
duns=scan(buff,2,"#");
output;
company="";
exchange="";
ticker="";
duns="";
end;
else company=buff;
run;