Several years ago I attempted to profit from earnings. I did much research, and would correctly guess beat or miss exptectation, but it seemed the movement aft

Several years ago I attempted to profit from earnings. I did much research, and would correctly guess beat or miss exptectation, but it seemed the movement afterwards was not correlated to the beat/miss, but more with the change in forward guidance. So, insiders can know the numbers, but if they don't also know the guidance, they can't really profit. Even then, the market would sometimes run in the opposite direction it should have given the news, or gyrate wildly until early the next day.