A surge in oil prices has been a boon to energy and commodity funds this week, but many investors say they aren’t ready to shift their portfolios yet in response to violence in Iraq. Concerns that a Sunni insurgency could spread to southern Iraq and threaten the nation’s 2.5 million barrels a day in oil exports sent global crude prices to nine-month highs on Thursday. Brent, the international benchmark, rose 4.4% for the week. The energy sector of the S&P 500 has climbed 1.4% for the week, while the stock index as a whole is down 0.8%. But investors said without an actual supply disruption, they aren’t convinced oil’s price gains will last. “I didn’t do anything today,” said David Ginther, senior vice president at Ivy Investment Management Co., who manages […]