Per Champ @Mike 9241:
'Is there an amount on 2c of the 1099div? if it's zero delete the entry because that code section does not apply. If it's not zero we can't answer your question directly.
Sec 1202 says a portion of the gain from sale of Qualified Small Business Stock (QSBS) reported on 2c is excludable if the stock was held more than 5 years.
acquired 8/11/93 - 2/17/09 50%
acquired 2/18/09 - 9/27/10 75%
acquired after 9/27/10 100%
That code section also provides that the gain can be rolled into another QSBS if the stock was held over 6 months and done with 60 days of sale.'
Here's more info on Exclusion % on Vanguard.