Click the chart to track Transatlantic Holdings' stock.
NEW YORK (CNNMoney) -- After the S&P 500 (SPX) lost more than 10% over the past two weeks, the sell-off continued with full force on Monday morning.
The U.S. government debt was downgraded a notch below AAA on Friday evening, but long-term treasuries rallied -- reflecting the current lack of risk appetite.
Gold reached another all-time high Monday morning, spurring rumors that CME might increase the margin requirements for trading gold futures.
Meanwhile, the recent decline in equities is starting to attract bargain hunters. Berkshire Hathaway (BRKA, Fortune 500) made a $52 per share bid for Transatlantic Holdings (TRH).
These are among the popular themes on StockTwits Monday:
dinosaurtrader: Like shocking a dead dude. They keep trying to get the market to bounce, but vital signs not improving yet. $$ $SPY
AronPinson: Been tweeting this for months: Gold not producing Cash Flows is a flawed argument. Treat it like a currency (one that can't be printed) $GLD
jkings1: Which comes first? $1725 gold, or a CME special a la margin hike? $GLD $GC_F
ivanhoff: $TLT $UUP being up this morning should not surprise anyone. It is a knee jerk reaction. When money leaves equities, it has to go somewhere
ChrisLaBossiere: Seeing Warren Buffett enter a competitive $3.2B acquisition race for $TRH this weekend is so perfect. A lot of bargains will be appearing.
OptionTactician: $BRK/A offer of $52 per share for $TRH shows you how the smart money wants to take advantage of sell-off 
| Index | Last | Change | % Change |
|---|---|---|---|
| Dow | 12,454.83 | -74.92 | -0.60% |
| Nasdaq | 2,837.53 | -1.85 | -0.07% |
| S&P 500 | 1,317.82 | -2.86 | -0.22% |
| Treasuries | 1.74 | -0.01 | -0.80% |
| Company | Price | Change | % Change |
|---|---|---|---|
| Bank of America Corp... | 7.15 | 0.01 | 0.14% |
| Sprint Nextel Corp | 2.62 | 0.09 | 3.56% |
| Cisco Systems Inc | 16.33 | -0.06 | -0.37% |
| Chesapeake Energy Co... | 15.81 | 0.23 | 1.48% |
| Ford Motor Co | 10.60 | 0.01 | 0.09% |
| Overnight Avg Rate | Latest | Change | Last Week |
|---|---|---|---|
| 30 yr fixed | 3.80% | 3.80% | |
| 15 yr fixed | 3.09% | 3.11% | |
| 5/1 ARM | 2.65% | 2.69% | |
| 30 yr refi | 3.77% | 3.86% | |
| 15 yr refi | 3.09% | 3.21% |
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