Looks like UBS (UBS) isn't going to hand over files on its American clients to U.S. tax authorities.

Nationalist and left-wing lawmakers blocked a treaty with the U.S. that would have allowed UBS to hand over said files. This "treaty" was reached last August between the Swiss government and Washington in order to put to rest a disagreement about UBS's supposed role in tax evasion. The boondoggle was that the Social Democrats wanted a commitment from the government to tax bankers' bonuses and the People's Party wanted a vote against the tax before dealing with the U.S. tax treaty.

MOST NOTEWORTHY: Wyeth (WYE), Luminent Mortgage Capital (LUM), CheckFree (CKFR), EOG Resources (EOG) and K-Swiss (KSWS) were today's noteworthy downgrades:

• Cowen downgraded Wyeth (NYSE: WYE) to Neutral from Outperform based on limited long-term limited visibility.

• JP Morgan downgraded shares of Luminent Mortgage (NYSE: LUM) to Underweight from Neutral citing difficult CMO and CDO market conditions.

• JP Morgan downgraded CheckFree (NASDAQ: CKFR) to Neutral from Overweight following the company's acquisition by FiServ (FISV).

• Matrix cut shares of EOG Resources (NYSE: EOG) to Sell from Buy to reflect lower natural gas prices and increasing costs.

• Matrix believes soft demand for athletic shoes is leading to declining sales for K-Swiss (NASDAQ: KSWS), and cut shares to Sell from Buy...

OTHER DOWNGRADES:

• JMP Securities downgraded CapitalSource (NYSE: CSE) to Outperform from Strong Buy.

• Oppenheimer has turned negative on oil and gas names for the near-term, as they now believe the downside risk exceeds upside potential; they cut shares of Apache Corp (NYSE; APA), BP PLC (NYSE: BP), ConocoPhillips (NYSE: COP), Chevron (NYSE: CVX) and ExxonMobil (NYSE: XOM), among others, to Neutral from Buy.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).