A condition in which an investor has more long positions than short positions in a given asset, market, portfolio or trading strategy. Investors who are net long will benefit when the price of the asset increases.
Taobiz explains Net Long
Many mutual funds are restricted from short selling, which means the funds are usually net long. In fact, most individual investors do not hold large short positions, making the net long portfolio a common and usually expected investing situation.
A position that is net long position is the opposite of a position that is net short.