In the past six months, some of the nation's largest companies have announced plans to move abroad. AbbVie, a pharmaceuticals company based in Illinois, has agreed to acquire a smaller British rival, Shire, so the combined company can relocate to Britain for tax purposes. Another drug company, Mylan, which is based outside Pittsburgh, has proposed buying the international generic drug business of Abbott Laboratories so the company can relocate to the Netherlands. Medtronic, a medical device company based in Minneapolis, has agreed to acquire Covidien of Ireland. Applied Materials has agreed to buy Tokyo Electron so it, too, can move to the Netherlands. And last week, Burger King announced it was buying Tim Hortons, the Canadian chain of coffee-and-doughnut shops, in a deal that would make Burger King a corporate citizen of Canada.
More from The New York Times:
What Happens When Health Plans Compete
Solar Company Seeks Stiff U.S. Tariffs to Deter Chinese Spying
UberBanned Across Germany by Frankfurt Court
The California Public Employees' Retirement System, the nation's largest public pension fund and typically one of the most vocal, has remained silent.
"We don't have a view on this from an investor standpoint — we're globally invested, as you know, and appreciate that tax reform is a government role," Anne Simpson, Calpers's senior portfolio manager and director of global governance, told me. "We do expect companies to act with integrity, whatever the issue at hand — that goes without saying. We also want to see a focus on the long term."
When I pressed for more, her spokesman wrote to me, "We're going to have to take a pass on this one."
Public pension funds may be so meek on the issue of inversions because they are conflicted. On one side, Public pension funds may be so meek on the issue of inversions because they are conflicted. On one side, the funds say they care about the long term and the implications for their state. Calpers's "Investment Beliefs" policy states that the pension system should "consider the impact of its actions on future generations of members and taxpayers," yet most pension funds are underfunded and, frankly, desperate to show investment returns. Mergers for tax inversion can prop up share prices of the acquirers and clearly help pension funds, at least in the short term, show improved performance.
Some pension managers say that their job is strictly about generating cash for pensioners and that they shouldn't take other issues into consideration. Ash Williams, the executive director and chief investment officer of the Florida State Board of Administration, which manages more than $150 billion, explained it to me this way: "If you're in my seat, you're thinking about it not only as an investor, but you're thinking about it as a fiduciary, which sort of walls out a lot of the political considerations that might otherwise be there." He went on: "You just have to think, 'O.K., so I'm guarding the economic interest of my beneficiary. That is my duty, and that's the start, the middle and the end of it.' "
Read MoreBusinesses are winning cat-and-mouse tax game
When I pressed him about whether he felt he needed to consider the impact of these deals on the American tax base, which would affect pensioners, he said, "I guess I'd have to say what's best for the company, what therefore maximizes the value of the ownership relationship I have to the company." He added, "I mean, my gut is, as an American you'd like to keep businesses here."
Mr. Williams's approach appears to be the norm among most investors. However, Mark Cuban, the investor and owner of the Dallas Mavericks, took to Twitter with the kind of view you'd expect from a public pension fund, not a free-market evangelist.
Read MoreInvesting in tax inversions
"If I own stock in your company and you move offshore for tax reasons, I'm selling your stock," Mr. Cuban wrote on Twitter in July. "When companies move offshore to save on taxes, you and I make up the tax shortfall elsewhere," he said, encouraging investors to "sell those stocks and they won't move."
Last month, Shirley K. Turner, a Democratic New Jersey state senator, introduced a novel piece of legislation in an effort to make inversion deals less attractive. She proposed that the state's pension board be forbidden to invest in companies that are involved in inversion deals. She said the state of New Jersey "ranks sixth among public pension funds investing in corporate inverter AbbVie, holding more than 1.5 million shares of the company's common stock, valued at $81.9 million."
It is unclear how such legislation would work. For example, would the state immediately be forced to sell its holdings in a company involved an inversion?
Not all officials who oversee pension funds are focused only on the immediate bottom line.
"Our fiduciary duty to our members is to vote our economic interest — and that means making an individualized determination of whether a given transaction is in our best interests as long-term share owners," said Scott M. Stringer, the New York City comptroller. "As a result, we don't merely look at the offer price on the day of closing but instead take into consideration everything from potential influence on shareholder rights to whether a merger places short-term gain over long-term growth." Still, as Pfizer, one of the largest companies in New York, has continued to contemplate a merger with AstraZeneca that would make the combined corporation a British entity, neither Mr. Stringer nor any other investor acting on behalf of pensioners has spoken out. Perhaps not surprisingly, the only people who appear to be concerned are a small but growing group of politicians in Washington.
After Burger King announced its deal with Tim Hortons, Senator Carl Levin, Democrat of Michigan, declared, "If this merger goes through, there could well be a strong public reaction against Burger King that could more than offset any tax benefit it receives from a tax avoidance move," suggesting customers take up the cause.
Read MoreI call BS ontax-inversion outrage!—Commentary
Indeed, the Walgreen Company, which had been considering a tax inversion transaction with Alliance Boots of Britain, voted against changing its corporate citizenship because the American pharmacy chain's board and management worried about an outcry from customers, according to people close to the board, and were concerned that pressure from customers could spill over to the government.
Where are the investors? Happily watching their returns rise. When I asked Mr. Williams, the Florida pension manager, what he would do if he had to vote on a deal involving a Florida company pursuing an inversion that would hurt the state's tax base, he sighed and said: "This issue is new enough — and fortunately, at this point, it's small enough — that it hadn't reached those dimensions. And I would just hope that we can get something done at the policy level to resolve it. That's the best outcome."
—By CNBC anchor and New York Times reporter Andrew Ross Sorkin