Here is a timeline of his activities. You have to decide whether he was actively involved or not.
February 11, 1999
Romney announces his departure from Bain Capital to run the Salt Lake City Olympics. The Boston Herald reports that "he will stay on as a part-timer with Bain, providing input on investment and key personnel decisions." In Turnaround, he writes of his decision, "I would walk away from my leadership at Bain Capital at the height of its profitability and take a position without compensation." According to Bain Capital and the Romney campaign, this marks the drop-dead point: "He has had no involvement in the management or investment activities of Bain Capital, or with any of its portfolio companies since that time," a Bain spokeswoman told David Corn in July.
March 25, 1999
More than a month after Romney claims to have retired from the company, new filings with Securities and Exchange Commission (SEC) indicate that he is still the sole shareholder and president of Brookside and Sankaty.
July 19, 1999
A Bain Capital press release notes that Romney is "currently on a part-time leave of absence to head the Salt Lake Olympic Committee" and quotes him praising two departing subordinates.
November 1999
Along with Chicago-based private equity firm Madison Dearborn Partners, Bain purchases $75 million worth of shares in Stericycle, a medical waste company that, among other things, disposes of aborted fetuses. Documents filed with the SEC state that Romney has "voting and dispositive power" as CEO of Bain.
Jan. 3, 2000
An SEC document signed by Romney states: “W. Mitt Romney is principally engaged in the business of serving as sole stockholder of BCI VI, Inc. (Bain Capital Investors VI).” Another SEC filing seven months later identifies him as "managing director of Bain Capital"
June 2000
A glitch in the Matrix? Romney not included on a list of 18 private equity fund managers provided by Bain Capital in advance of the firm's seventh private equity fund.
Nov. 11, 2000
Ann Romney tells the Boston Globe that Bain has absorbed almost all of her husband's time. Romney "has had to lessen his involvement with Bain Capital, his investment firm," the paper reports.
Dec. 2000
Bain Capital makes one of its most controversial acquisitions, paying $300 million for KB Toys, most of it borrowed. KB later took out loans to pay out bonuses to Bain execs worth more than $120 million. It filed for bankruptcy in 2004 and closed 600 stores.
Jan. 2001
A new venture capital offshoot, Bain Capital Venture Fund, launches, with no mention of Romney.
Feb. 2001
In an SEC filing, Romney lists his "principal occupation" as "managing director of Bain Capital." That same year, a filing with the Massachusetts State Ethics Commission filing notes that Romney sits on the board of LifeLike, a doll manufacturer acquired by Bain at Romney's direction. Documents submitted to the SEC in May identify Romney as a "member of the management committee" of two other Bain entitites.
Aug. 2001
Leaving for real this time: The Salt Lake Tribune reports that Romney gives up "control over all of Bain Capital’s voting stock, dividing the shares between the two dozen directors. The divestiture had no financial ramifications, Romney said, affecting only the management and control of the company." This change in status was affirmed by Romney's lawyer in a 2007 Washington Post interview.
Jan. 2001
Five new entities formed by Bain and incorporated in Delaware list Romney as a manager. Later that year, when it becomes clear he will enter politics rather than return immediately to the private sector, Romney and Bain finalize his severance package. The 10-year deal is retroactive to 1999.
June 2002
n order to demonstrate that he's eligible to be on the ballot in Massachusetts, Romney testifies to the state Ballot Law Commission that he sat on the board of Lifelike and Staples, and flew home regularly for board meetings: "[T]here were a number of social trips and business trips that brought me back to Massachusetts, board meetings, Thanksgiving and so forth."
Dec. 2002
One month after Romney defeats Democrat Shannon O'Brien to become Massachusetts' governor-elect, Bain files an annual report with the state listing Romney as a managing member of the firm.
http://www.motherjones.com/mojo/2012/07/mitt-romney-bain-capital-timeline