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			 Looking back three decades at 52 completed transactions, the 
			review showed 19 of the companies have subsequently outperformed the 
			Standard & Poor's 500 index, while 19 have underperformed. Another 
			10 have been bought by rivals, three have gone out of business and 
			one has reincorporated back in the United States. 
 Among the poorest performers in the review were oilfield services 
			and engineering firms, all from Texas. Among them was the first of 
			these companies to invert, McDermott International Inc <MDR.N>, 
			which moved its tax home-base to Panama in 1983.
 
 Drugmakers are dominating the latest wave of inversions and most of 
			them have outperformed the benchmark index. So far in 2014, five 
			U.S. pharmaceutical firms have agreed to redomicile to Ireland, 
			Canada or the Netherlands. Deals that have not been completed were 
			excluded from the review.
 
 It is impossible to know how the companies might have fared in the 
			market had they not inverted. Innumerable factors other than taxes 
			influence a stock's performance, and no two of these deals are 
			identical, complicating simple comparisons.
 
 But the analysis makes one thing clear: inversions, on their own, 
			despite largely providing the tax savings that companies seek, are 
			no guarantee of superior returns for investors.
 
			
			 The deals basically involve a U.S. company initially forming or 
			buying a foreign company. Then the U.S. company shifts its tax 
			domicile out of the U.S. and into the foreign company's home 
			country. The name "inversion" comes from the idea of turning the 
			company upside down, making a smaller offshore unit the new head and 
			the larger U.S. business the body.
 Companies that do these deals typically promise shareholders will 
			benefit. But aside from stock price underperformance by many, 
			inversions can also impose substantial up-front tax costs. When a 
			deal occurs, investors must recognize any taxable capital gains on 
			their stockholdings. These costs are not taken into account in the 
			study as they differ for each shareholder and don't apply in some 
			cases.
 
 "For some companies, these inversions are really smart business 
			moves. For others, they're less smart ... You don't always know if 
			it's going to work," said James Hines, professor of law and 
			economics at the University of Michigan and one of a handful of 
			academics who have closely studied these deals.
 
 TAXES AND TEXAS
 
 Corporations that invert say they are only seeking to pay the lowest 
			tax rate they can get, noting this is what shareholders would expect 
			them to do.
 
 Inversion was pioneered as a strategy by oilfield companies that 
			reincorporated chiefly in the Cayman Islands, Bermuda and Britain. 
			Most have lagged the S&P500 since their inversions were completed: 
			McDermott by 85 percent; Rowan Cos Plc <RDC.N> by 35 percent; 
			Transocean Ltd <RIG.N> by 18 percent; among others.
 
 These oilfield stocks also largely underperformed narrower Thomson 
			Reuters and Dow Jones oil and gas equipment and services sector 
			indexes, looking as far back as index data allows.
 
 McDermott did not reply to questions sent to the company. Transocean 
			did not respond to requests for comment.
 
			 A Rowan spokeswoman referred questions to the company web site. It 
			said the company's 2012 UK redomiciling "was designed to enhance 
			shareholder value," while putting Rowan closer to customers and 
			North Sea operations and enabling it to stay competitive "with the 
			effective tax rates of its global competitors, most of which are 
			domiciled outside the U.S."
 Beyond oilfield services, the inversion strategy has been used by a 
			half-dozen U.S. insurance firms, with half of them outperforming and 
			the rest either acquired or out of business.
 
 White Mountains Insurance Group Ltd <WTM.N>, managed from Hanover, 
			New Hampshire, has outpaced the S&P500 by 248 percent since 
			reorganizing in 1999 as a Bermuda corporation, for example. A 
			spokesman for the company said it had no comment.
 
 INTENSE COMPETITION
 
 The analysis, using Reuters data and analytics, measured simple 
			share price performance against the S&P 500 index using two 
			benchmarks - the date when each company completed its inversion 
			deal, and the date when each deal was announced.
 
 With only four exceptions, the inverted companies that were still in 
			business since doing their deals either uniformly underperformed or 
			outperformed on both benchmarks.
 
 For instance, U.S. engineering and construction group Foster Wheeler 
			AG <FWLT.O> announced in November 2000 - when its stock was worth 
			about $45 per share - that it was inverting to Bermuda. The deal, a 
			statement said, was "expected to benefit Foster Wheeler and its 
			stockholders for several reasons."
 
 Since the announcement, the company's stock has lagged the S&P 500 
			by 50 percent; since the deal was concluded in May 2001, it has 
			trailed the index by 83 percent. Foster Wheeler agreed in January 
			2014 to be acquired by UK rival Amec Plc <AMEC.L> for about $32.69 
			per share in Amec stock and cash at the time. The deal is expected 
			to close in the fourth quarter.
 
 Foster Wheeler spokesman Scott Lamb said the company dealt with weak 
			markets, several problematic projects and a major debt restructuring 
			after it inverted to Bermuda. It recovered and so did its stock 
			price, but the 2008 economic downturn, he said, brought "an extended 
			period of moderate demand and intense competitive pressure. These 
			conditions have adversely affected the performance of all of the 
			companies in this sector."
 
 
			 
			Also, in the past decade, he said, the company's revenue and 
			employment base have largely shifted out of North America.
 
 "HERD MENTALITY"
 
 Concern is growing in Washington about inversions. President Barack 
			Obama has criticized a "herd mentality" by companies seeking deals 
			to escape U.S. corporate taxes.
 
 Of the 52 inversions and similar redomiciling deals done since 1983, 
			22 have occurred since 2008, with 10 more being finalized and many 
			more said to be in the works.
 
 Following recent deals by major companies such as Medtronic Inc 
			<MDT.N>, bankers and analysts have said that another burst of deals 
			is waiting to be unveiled in September.
 
 Congressional action this year is unlikely with Republicans so far 
			opposing Democrats' proposals, analysts said, though the Obama 
			administration has been weighing executive actions.
 
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			For instance, the White House may announce tighter restrictions on 
			federal government contracting with inverted companies, said Chris 
			Krueger, an analyst at Guggenheim Securities in Washington in a 
			research note last week.
 Inversions have a firm legal basis. The government has been writing 
			rules on them for 30 years. But they are complex and risky and some 
			major proposed deals have recently unraveled.
 
 On August 6, for example, after months of internal debate and public 
			criticism from politicians, U.S. retailer Walgreen Co <WAG.N> said 
			it would not reincorporate in Europe. It was considering using its 
			purchase of Europe's Alliance Boots Holdings <ABN.UL> for such a 
			maneuver.
 
 Drugmaker Pfizer Inc <PFE.N> and advertising firm Omnicom Group Inc 
			<OMC.N>, U.S. leaders in their industries, have also walked away 
			from planned inversions in recent months because they couldn't reach 
			deals with their targets.
 "EARNINGS STRIPPING"
 No two inversions are identical and they have changed shape along 
			with evolving U.S. Internal Revenue Service (IRS) rules.
 
 One appeal of inversions is putting foreign profits out of the IRS's 
			reach. Another is "earnings stripping," in which a foreign parent 
			lends to a U.S. unit, which deducts the interest to shrink its U.S. 
			income for tax purposes, while the foreign parent books the interest 
			at its home country's lower tax rate.
 
 Inversion destinations have lower corporate tax rates than the 
			United States. The top U.S. rate of 35 percent is among the world's 
			highest. Add state and local taxes and, in much of the United 
			States, the headline corporate rate is even higher.
 
			
			 Still, many U.S. companies pay far below that headline rate because 
			of abundant loopholes that give businesses, especially big ones, a 
			lower effective tax rate.
 Inverting usually does not mean a U.S. company fully decamps from 
			home. In most cases, it means opening a foreign office, but leaving 
			core operations in the United States.
 
 "NAKED INVERSIONS"
 
 Inversions underwent a major change in 2004 when the IRS adopted a 
			rule - Section 7874 of the tax code - that slapped new limits on the 
			deals, making them harder to do.
 
 Pre-7874 deals were sometimes known as "naked" or "self-help" 
			inversions. One example was Helen of Troy Ltd <HELE.O>, an El Paso, 
			Texas consumer products group that sells hair dryers, kitchenware 
			and other goods. In 1994, the company set up a Bermuda holding 
			company and simply transferred its tax domicile into it. Since then, 
			Helen of Troy has outperformed the S&P 500 by 219 percent. The 
			company declined to comment.
 
 Deals like this continued through 2002, involving groups as diverse 
			as manufacturer Ingersoll Rand Plc <IR.N>, which has outperformed 
			the S&P500 by 103 percent since inverting in 2001, and underwear 
			maker Fruit of the Loom. An Ingersoll Rand spokeswoman declined to 
			comment.
 
 Fruit of the Loom inverted to the Cayman Islands in 1998-1999. Three 
			years later, it was bought out of bankruptcy by Berkshire Hathaway.
 
 In 2004, Section 7874 was adopted in response to naked inversions. 
			It set two tests for whether an inverted company is recognized as 
			foreign or domestic by the U.S. government.
 
 EATON AND COOPER
 
 Since Section 7874, most inversions, though not all, have involved 
			the acquisition of actual, operating foreign companies, with the 
			costs, opportunities and challenges that can present.
 
			
			 For instance, Cleveland, Ohio's Eaton Corp Plc <ETN.N>, a maker of 
			power management products, in 2012 moved its tax domicile to low-tax 
			Ireland by acquiring Cooper Industries, itself an inverted company 
			that reincorporated from the United States to Bermuda in 2002 and 
			then Dublin in 2009.
 
 "The acquisition of Cooper was a strategic decision to add scale and 
			breadth to our global electrical business ... The acquisition of 
			Cooper was transformational for our business," said Eaton spokesman 
			Scott Schroeder in emailed comments.
 
 When the deal was announced, Eaton Chief Executive Sandy Cutler said 
			it would shave about $160 million off Eaton's annual tax bill. He 
			said business motivations, not tax reductions, were the key reasons 
			for the transaction.
 
 Eaton's effective tax rate in 2013 was only 0.6 percent, down from 
			2.5 percent in 2012 and from 12.9 percent in 2011, said Eaton's 2013 
			annual report to federal regulators.
 
 "The lower effective tax rate for 2013, compared to 2012, was 
			primarily attributable to the effects associated with the 
			acquisition of Cooper, along with greater levels of income in lower 
			tax jurisdictions and additional foreign tax credit utilization," 
			Eaton said in the Securities and Exchange Commission filing.
 
 Despite the tax savings, Eaton has underperformed the S&P 500 by 5 
			percent since completing the Cooper deal in November 2012. But, 
			measuring from the day when the deal was announced in May 2012, 
			Eaton's share price has outperformed the index by 9 percent, Reuters 
			data showed.
 
 The first U.S. drug company in the 52 to complete an inversion was 
			biotechnology group Xoma Corp <XOMA.O>, which shifted to Bermuda in 
			1998. Thirteen years later, the company returned its tax domicile to 
			the United States, saying in a statement it wanted to reduce 
			exposure to possibly adverse tax legislation and to come back to a 
			more familiar legal system.
   
			
			 Xoma has posted losses since 2010 and, despite returning to 
			California, has underperformed the S&P500 by 95 percent since it 
			went to Bermuda. A spokeswoman said Xoma had no comment.
 (Editing by Amy Stevens and Martin Howell)
 
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