Top General Motors executives acquired shares in the IPO and some added to their stakes afterward, led by chief executive Dan Akerson and chairman Ed Whitacre.

Whitacre and Akerson acquired more than $500,000 of GM stock each, taking 800 shares each in the initial public offering and then adding to their stakes afterward in open market transactions, filings with US securities regulators showed, according to Reuters.

Other executives and company directors also bought into GM's IPO.

Vice chairman Stephen Girsky acquired stock through the IPO and added to his stake afterward, reporting a total investment of nearly $114,000, securities filings showed.

GM chief financial officer Chris Liddell, GM product development chief Tom Stephens and GM North America president Mark Reuss also disclosed purchases at the IPO price.