assuming you have no open positions which would create wash sales and all your gains and losses are short-term capital gains (with wash sales the holding period of the original shares adds on to the replacement shares and thus can create a long-term holding period ), they would all be netted resulting in a $200,000 Short-Term Capital Loss. if you have no other capital gains or losses the amount you can actually deduct in any one year is limited to $3,000 leaving you with about a $197,000 (or $200,000 if you have no other items of taxable income) in short-term capital loss carryover that can be used in future years to offset capital gains and then any remainder is subject to the $3,000 per year deductible limit,. this $3,000 allowed capital loss (line 7 on Form 1040) can be used to offset any other taxable income on Form 1040 lines 1 thru 6a and line 8.
the total/net of lines 1 through 8 is reduced by adjustments to income and your standard or itemized deductions to arrive at taxable income
oh, and it wouldn't matter if some trades were long-term. your net STCL would offset an equal amount of LTCG. any excess capital losses (long or short-term) are subject to the same $3,000 per year deductible limit.
