Who has stock in Delta Air Lines?

About half of Delta's outstanding shares are in the hands of just four institutions, affording them at least the opportunity for big influence as the Atlanta-based airline seeks a merger with Northwest Airlines.

Pension Benefit Guaranty Corp.
A federal agency that insures the pensions of millions of workers and retirees. It received its Delta stake when the airline walked away from a pilot pension plan. As shareholders, "We did not push one way or another on the question of this merger," spokesman Jeffrey Speicher said Tuesday. The PBGC's stake is managed by JPMorgan Chase.
• Number of shares: 43.6 million
• Percentage of Delta's outstanding shares: 14.9%
• Latest moves disclosed: Sold nearly 6 million shares, according to a February disclosure.

Fidelity Management & Research
Investment adviser to mutual funds of Fidelity, a huge financial services company that manages more than $1.5 trillion. Fidelity, based in Boston, is the largest U.S. mutual fund company and a major provider of 401(k) retirement savings plans. Fidelity was a major Delta creditor and had bond claims against Delta during the airline's earlier bankruptcy.
• Number of shares: 38.6 million
• Percentage of Delta's shares outstanding: 13.2%
• Latest moves disclosed: Added 2.2 million shares disclosed in a filing at the end of 2007.

Wellington Management Co.
An investment adviser based in Boston that oversees more than $550 billion in assets. Activities include hedge funds. Wellington has stock in a number of airlines, including a big piece of Northwest.
• Number of shares: 32.9 million
• Percentage of Delta's shares outstanding: 11.3%
• Latest moves disclosed: Filings indicate it acquired the bulk of its Delta holdings in recent months.

Lord, Abbett & Co.
A privately held money management firm based in Jersey City, N.J., it oversees about $100 billion in assets.
• Number of shares: 29.3 million
• Percentage of Delta's shares outstanding: 10%
• Latest moves disclosed: Added 4 million shares it reported in a filing late last year.

LMM LLC
Based in Baltimore, it is a subsidiary of Legg Mason, an asset manager with operations around the world.
• Number of shares: 7 million
• Percentage of Delta's shares outstanding: 2.4%
• Latest moves disclosed: Added to Delta holdings.

Pardus Capital Management LP
An activist hedge fund manager based in New York, Pardus had pushed for a merger of Delta and the parent of United Airlines. With the value of some of its investments sinking, Pardus recently put a hold on investors pulling money out.
• Number of shares: 7 million
• Percent of Delta's shares outstanding: 2.4%
• Latest moves disclosed: None noted.

Sources: Corporate filings, Bloomberg News, Journal-Constitution research