Homebuilding and construction-related exchange-traded funds were the best performers of the week, as several homebuilders benefited from an analyst upgrade. On Monday, Citigroup upgraded Centex ( CTX), Lennar ( LEN), Pulte Homes ( PHM), D.R. Horton ( DHI) and Ryland Group ( RYL) to buy from hold, as the firm believed a near-term bounce was coming due. Housing stocks also rallied Tuesday despite a weak report from the National Association of Realtors, which said that pending home sales dropped a greater-than-expected 6.5% in August. Economists expected a 2% decline in sales. For the week, the iShares Dow Jones U.S. Home Construction ( ITB) jumped 14.2% to $22.70. The SPDR S&P Homebuilders ( XHB) climbed 9.2% to $23.37. Financial ETFs were also higher for the week, following several M&A headlines out of the sector. Citigroup ( C) said Tuesday it will acquire the rest of Nikko Cordial, a Japan-based broker, for $4.6 billion. On Monday, Citigroup was part of a rally in the financial sector, despite acknowledging that third-quarter earnings should drop 60% from a year ago. Another deal Tuesday saw Commerce Bancorp ( CBH), a New Jersey bank, acquired by Canada's TD Bank ( TD) for $8.5 billion in stock and cash. Additionally, Royal Bank of Canada ( RY) laid out plans to buy a Caribbean bank, RBTT Financial Group, for roughly $2.2 billion. The Ultra Financial ProShares ( UYG) advanced 9% to $62.55. The iShares Dow Jones U.S. Broker-Dealers ( IAI) was higher by 5.6% to $54.92. The KBW Bank ( KBE) ETF added 3.8% to $54.37. Overseas-related ETFs were also among the top winners of the week as Asia markets were higher. Over the five sessions, Japan's Nikkei rose 1.7% and Hong Kong's Hang Seng rose 1.5%. The iShares FTSE/Xinhua China 25 Index ( FXI) advanced 6.4% at $191.60. The SPDR S&P China ( GXC) added 5.1% to close at $98.67. The PowerShares Golden Dragon Halter USX China ( PGJ) gained 3.8% to $34.59. The United States Natural Gas ( UNG) ETF was one of the week's laggards, although still finished with slight gains. Natural gas prices slid 4.7% on Friday to $7.07 per million British thermal units, but still added 2.9% over the five sessions. The ETF rose 2.3% to $39.12.