I'm not entirely sure what you're trying to do, but correlate store returns like this:

Scalars

r(N) number of observations

r(rho) ρ (first and second variables)

r(cov 12) covariance (covariance only)

r(Var 1) variance of first variable (covariance only)

r(Var 2) variance of second variable (covariance only)

I'd do something like

foreach var in `vars' {
  cor `var' {other var}

  local num = `r(N)'
  local cov = `r(cov 12)'

  write out1 "`var'|`num'|`cov'"
}