I received a late 1099B after filing my 2016 taxes. I worked out the figures and it came out to a Capital Loss of 44 cents. Do I need to file a revised tax return for 2016.

You should. The consequences of not doing so may vary.

Is it a covered sale with cost basis reported to the IRS? If so, the IRS is unlikely to adjust your return as it already knows the loss is rounded to $0.

Is it a noncovered sale wherein cost basis has not been reported to the IRS? (Or a mix of these for multiple sales) If you have noncovered sales, the IRS doesn't know that your loss is $.44. They won't know until you report the sales and the costs. If you don't amend your return to report the sales, you will get an IRS notice looking to tax just the sales price.