(Note: The spreadsheet numbers for IA & NE were actually updated with this data a couple of weeks ago, but it took me this long to get around to writing up the explanation)
In a December 23rd interview with the Des Moines Register, CoOportunity Health (1 of 2 companies participating in IA's ACA exchange (and 1 of 3 participating in NE) said they had enrolled 2,577 people in private plans via the HC.gov exchange as of 12/20. However, they also mentioned a total of 8,583 enrollments state-wide as of 12/20, meaning another 6,006 people were enrolled directly through the company, bypassing the exchange completely.
I contacted Leigh McGivern, the PR representative for CoOportunity Health, who informed me that CoOportunity operates in Nebraska as well, and gave me more recent and detailed numbers for both states: 3,468 exchange-based enrollments (not sure if this is people or households) in Iowa, and another 7,362 exchange-based enrollments in Nebraska.