Even so, I always keep an eye on which passive income stocks are soon to go ex-dividend. With this in mind, here are three FTSE 100 giants that those in the midst of building an income-focused portfolio might wish to consider while there's still time. That's higher than the FTSE 100 as a whole. Imperial BrandsAlso going ex-dividend in August is perennial income favourite Imperial Brands (LSE: IMB). InvestecRounding off our trio of soon-to-be ex-dividend stocks is recent FTSE 100 addition Investec (LSE: INVP).