Large Cap Growth benchmark Index

These growth funds such as VUG follow benchmark index established by research institutions such as CRSP (University of Chicago Center for Research in Security Prices), https://www.crsp.org/indexes/crsp-us-large-cap-growth-index/ and London Stock Exchange FTSE Russell 1000 Growth Index,  https://research.ftserussell.com/Analytics/Factsheets/Home/DownloadSingleIssue?issueName=US1001USD&IsManual=true

QQQ/QQQM only track the top 100 on NASDAQ.

Many "large cap growth mutal funds" in retirement accounts follow these benchmark index. Some people think they offer better long term growth-risk posture than QQQ/QQQM.