The composite cofactor of 10,269- was the product of 91-digit and 143-digit prime numbers:

91-digit prime factor:
2211459886311754779116554026679494335670326227547524190235297713426923019604371977151573671

143-digit prime factor:
2104946788588286335929292343541861216279734735426003153793162588595230596872540202866576982996196\
1571593196933422283287799690503391927023385089

This number was a collaboration between Bruce Dodson, Serge Batalov, and NFS@Home. The factors will be reported to the Cunningham project and will be recorded on Page 114. Let's keep sieving!