Nearly all employer firms in the U.S. are private (with listed companies representing less than 1 percent), so the performance of private manufacturers is a key barometer of the sector as a whole, according to a report from Sageworks, a provider of financial analysis solutions. In the six-month period ending in January 2013, private manufacturing companies were seeing 9.5 percent annual sales growth, up slightly from the six-month period ending in December 2012.