GMAT Sentence Correction (SC) | In all, fifteen or more Greenwich Capital employees

DearMo2men ,

I'm happy to respond.

The"with" + noun + participle structure is not automatically wrong. There's a subtle distinction that I explain in this blog:
[url="http://magoosh.com/gmat/2015/with-noun-participle-on-gmat-sentence-correction/"] with +[noun] +[participle] on GMAT SentenceCorrection[/url]

Does this make sense?
Mike