Pay czar to release pay data within 30 days-analyst

*Data on top 25 employees at 7 big companies due - analyst

*To tie compensation to long-term performance - analyst

NEW YORK, Sept 18 (Reuters) - President Obama's "pay czar" told an FDIC conference that within 30 days he plans to make public the pay of the top 25 employees at seven big companies, according to an analyst who attended the session.

The analyst, Jaret Seiberg of Concept Capital, wrote in a research note that Pay Czar Kenneth Feinberg also told the Thursday conference that he would look to use stock incentives to tie compensation to long-term performance.

Feinberg said he would release the salary information on the top 25 employees at Citigroup Inc (C.N), Bank of America Corp (BAC.N), AIG (AIG.N), General Motors [GM.UL], GMAC, Chrysler and Chrysler Financial, Seiberg wrote.

The pay czar said he would release the pay system for employees 26 though 100 by year-end, according to the analyst.

Feinberg was appointed in June and given broad authority to decide pay packages for the most highly compensated employees at firms that received extraordinary government bailouts.

Seiberg wrote that Feinberg is likely to try to use his authority over executive compensation at bailed-out banks to set a tone for the entire industry.

"That adds more uncertainty to the financial space and raises the possibility that top talent could leave to work for less regulated rivals," he wrote.

Feinberg seemed "very uncomfortable going after pay already paid," Seiberg wrote. The analyst thought it unlikely Feinberg would try to use his broad "clawback" power, which extends to any firm that accepted taxpayer bailouts. (Reporting by Steve Eder; editing by John Wallace)