(-) SQNM (-5.9%) declines as SEC initiates inquiry into Down Syndrome test announcement.

Active-volume exchange-traded funds in Tuesday's regular session:

SPDR S&P 500 (SPY): -0.8%

iShares S&P 500 (IVV): -0.7%

PowerShares QQQ (QQQQ): -0.2%

Select Financial Sector SPDRS (XLF): -1%

iShares Russell 2000 (IWM): -0.3%

iShares Russell 1000 Growth (IWF): -0.7%

iShares MSCI Emerging Markets Index (EEM): -1%

United States Oil Fund (USO): -1.9%

Top-volume movers in this morning's pre-market session:

SPY, +0.6%

QQQQ, +0.5%

IWM, +0.6%

UNG, -0.4%

USO, +1.6%

Winners and Losers

Major market ETFs, including the SPY, DIA, UYG and others, are firmer as stocks look to extend a solid Q2 performance into a new three-month period. The PowerShares QQQ (QQQQ), which tracks the technology-studded Nasdaq Composite, is up 0.5%.

Technology Select Sector SPDR (XLK) is flat. Check Point Software (CHKP) shares are flat so far this morning after they got downgraded by JP Morgan to neutral from overweight.

Financial stocks and funds are mostly higher. Select Financial Sector SPDRS (XLF) is up 0.6%. The Direxion Financial Bull 3X fund (FAS) is down 0.1%; its bearish counterpart (FAZ) is up 0.4%. Citigroup (C) sells NikkoCiti Trust to Nomura Trust for $196 million.

Commodities -

The United States Oil Fund (USO) is up 1.3%. August crude is up $1.05 at $70.94 a barrel.

August gold is up 0.3% to $930.30 an ounce. SPDR Gold Shares (GLD) is up 0.4%. iShares COMEX Gold Trust (IAU) is flat. The Market Vectors Gold Miners fund (GDX) is up 1%.

iShares Silver Trust (SLV) is up 0.5%.

ETF Power Play -

PowerShares Dynamic Basic Materials (PYZ) and ProShares Ultra Basic Materials (UYM) could see increased interest closer to today's bell.

Dynamic Materials (BOOM) is down 14% in pre-market trade after the company says it expects Q2 sales will be approximately 25% below Q1 revenue of $49.8 million. BOOM previously forecast a sequential revenue decline of between 10% and 14%. The Thomson Reuters mean estimate is $43.4 million. It also expects Q2 gross margins will be below the prior forecasted range of 27% to 29%.

In industry news, MacroMarkets received final SEC approval and launched trading earlier this week for the MacroShares Major Metro Up (UMM) and the MacroShares Major Metro Down (DMM) funds. The funds are intended to deliver 300% and -300% of the return of the S&P/Case-Shiller Home Price 10 Index, a benchmark of U.S. residential home prices.