Apple iPhone 8 and iPhone 8 Plus accounted for 44% of U.S. iPhone sales in Q1; iPhone X demand drops

We now have a full quarter of results for all of Appleās new iPhones, and together they account for a smaller share of total sales than the newest phones did this time last year. iPhone X saw its share fall to 16%, down from 20% in the December 2017 quarter. iPhone 8 and 8 Plus share improved relative to the December 2017 quarter, combining at 44% of sales, compared to 41% in the last quarter. This first calendar quarter typically represents baseline demand for iPhones, after the initial launch surge and before any slowdown as buyers begin to anticipate new models. After the initial excitement over the iPhone X features, the highest priced flagship appears to have settled into a smaller share of sales."-Josh Lowitz, CIRP Partner and co-founder
The survey shows that the 2015 and 2016 iPhone models continue to see demand. The 2016 iPhone 7 and iPhone 7 Plus contributed 20% of U.S. iPhone sales during the January-March period; the iPhone 6 and iPhone 6 Plus made up 13% of iPhone units rung up during this period. While the iPhone SE saw its share of iPhone sales decline from 11% last year's first three months to 8% during the first quarter of 2018, it was still up from its performance during the three months ended in December 2017.
source: CIRP (pdf)