Jan 21 (Reuters) - Interactive Brokers Q4 net income USD 969 million. * Q4 pretax profit USD 1,040 million vs. IBES estimate USD 986.8 million * Q4 EPS USD 1.99 * Q4 revenue USD 1,387 million vs. IBES estimate USD 1,368 million * Q4 net interest income USD 807 million * Q4 dividend USD 0.25