"The New International Version (NIV) is based on the 26th edition of the Greek text of Eberhard Nestle published in 1979. It, like the New American Standard Version (NASB) which is based on Nestle's 23rd edition of 1969, is an Egyptian bible. These and most modern translations (except the New King James Version and New Scofield Version which are handled separately in this book) are all products of Origen's tainted manuscripts from Alexandria, Egypt." (Samuel C Gipp)
Note. Westcott and Hort favoured the Alexandrian text.