By Liz Hoffman And Timothy W. Martin 

A boardroom battle last week at DuPont Co. exposed an emerging split in how the nation's two biggest pensions agitate for change inside corporate America.

The California State Teachers' Retirement System, No. 2 in the U.S. by assets, supported an effort by activist investor Nelson Peltz to break up the industrial giant and take four board seats. Roughly a mile away in Sacramento, Calif., the largest U.S. pension, the California Public Employees' Retirement System, decided instead to side with DuPont management, which was able to defeat the push by Mr. Peltz and his firm Trian Fund Management LP.

The divided loyalties represent a reversal for the two California retirement systems as they grapple with how much risk to take to achieve promised returns. Together they manage nearly $500 billion, roughly one-fifth of all assets held by state pensions in the U.S., but neither has enough to cover future obligations to retirees.

Decades ago, Calpers became one of the first U.S. pensions willing to publicly challenge companies' policies and performance while Calstrs had little presence in the activist world. Those roles flipped in recent years amid a new wave of investor activism. Calpers kept its disagreements with companies mostly behind closed doors while Calstrs publicly called for breakups, sales and other operational changes sought by activist funds--and in some cases invested side-by-side with them.

Since 2012, Calpers has voted against management's recommendations in just 8% of corporate elections while Calstrs has done so 45% of the time, according to Proxy Insight. They took opposite sides of board battles at drug company Forest Laboratories Inc. in 2012 and Griffin Land & Nurseries Inc. in 2014, with Calpers backing management and Calstrs supporting the insurgents, records show.

The two funds acknowledge their diverging views. "We want to engage companies quietly behind the scenes," said Anne Simpson, director of global governance at Calpers. Ms. Simpson's counterpart at Calstrs, Anne Sheehan, said support for activist investors such as Trian means "we're not limiting ourselves to one approach."

To be sure, both Calstrs and Calpers said they share a goal of generating long-term shareholder value. Calstrs still engages companies behind the scenes on issues such as executive pay or board composition, and Calpers still has older investments in activist funds.

Choosing to align with activist investors such as William Ackman or Mr. Peltz carries reputational and political risks for any public pension fund. Critics say activists often push for shake-ups that can endanger jobs and leave companies weaker in the long term.

"We get hurt twice," said Vonda Brunsting, director of the Service Employees International Union's capital stewardship program, who educates pension trustees on investment issues and is critical of the activist approach in general. "There are more questions than comfort" about activism's benefits, she added.

But activist funds have outperformed some rivals in recent years as pension funds have struggled to erase losses incurred during the 2008 financial crisis. Overall, activist funds produced five-year annualized returns of 8.5% through Jan. 31, versus 7.7% for all hedge funds, according to data provider Preqin. That compares with the S&P 500's 15.6%, including dividends. Many hedge funds say they don't attempt to beat a strong stock-market rally.

Calstrs has tripled the size of its activist fund portfolio since 2012 to roughly $5 billion, accounting for new commitments and investment gains, as it joined shake-up campaigns at companies including steel producer Timken Co. and fashion merchant Perry Ellis International Inc.

It said its U.S. activist portfolio, which includes commitments to funds run by Trian and Starboard Value LP, gained 132% between 2004 and 2014, versus 121% for the Russell 3000, its designated benchmark index. Calstrs's foreign activist investments have returned 16% since inception in 2008, versus a 3% loss for the foreign benchmark.

At Calpers, a $2.8 billion activist portfolio almost completely comprised by with commitments made before 2005 hasn't done as well. It underperformed the fund's one-, three-, five- and 10-year benchmarks by 6.4%, 2.2%, 0.85% and 1.3%, respectively, according to internal reports. But in cases where Calpers adopted less-hostile strategies, the performance of its portfolio companies has beaten the one-, three- and five-year benchmarks, by 1.2%, 13.4% and 8.9%, respectively.

The move away from aggressive corporate activism is a drastic shift for Calpers, which made waves in the early 2000s for chastising its portfolio companies on everything from capital structures to mergers. It committed billions to funds that agitated for change at big companies and in one example, in 2004 publicly joined a campaign led by activist Knight Vinke Asset Management urging oil giant Royal Dutch Shell to buy back more stock.

"In the early years Calpers moved mountains in this area," said Ted White, an early member of Calpers's activist team who worked at the pension fund from 1999 to 2005 and later started an activist hedge fund funded partly by Calstrs.

Calpers's retreat accelerated after the financial crisis as it cut allocations to activist managers while becoming more friendly to company management, according to advisers, consultants and public records.

"Calpers is more prone to work with boards and management than in the past," said Allan Emkin, a managing director at Pension Consulting Alliance, who has consulted for Calpers and Calstrs since the 1980s.

Access Investor Kit for E.I. du Pont de Nemours & Co.

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