The number of stock transactions from a brokerage account is limited to around 500 when using the TurboTax online editions and about 2,000 when using the TurboTax desktop CD/Download editions. The number of transactions per platform has been set for quite a few years and it is not known whether or not TurboTax will increase these limits for the following tax year.
See this TurboTax support FAQ for importing brokerage stock transactions - https://ttlc.intuit.com/community/entering-importing/help/how-do-i-enter-a-large-number-of-stock-tra...
