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S Corp with Straddles Income
If this activity were to generate let's say 100K of profit, and the   other corporate activities also generate 100K of revenue, are there   any issues tax-wise I need to be concerned about? Yes. Having 25% or more of passive income in 3 consecutive years will invalidate your S-Corp status and you'll revert to C-Corp. Can I deduct normal business expenses from the straddles (which are   taxed as short term capital gains) profit? I don't believe you can. You can deduct investment expenses from the investment income. On your individual tax return it will balance out, but you cannot mix types of income/expense on the corporate return or K-1.