The S&P 600 Small-Cap Index closed at an all-time high on Thursday, while the S&P 400 Mid-Cap Index came within points of reaching record levels.
So far in 2011, both indexes are up 10.8 percent and 11.5 percent, respectively. That compares to a 7.6 percent gain for large-cap stocks.
As investors turn their attention to Friday's job report, here is a look at where some of the major indexes stand in relation to their historic levels.
The table below highlights the best mid and small-cap companies in 2011.