| Code | Name | High | Low | Close | Volume | Change |
|---|
| MAB | Eaton Vance Insured Massachusetts | 11.250 | 9.940 | 9.940 | 11,000 | 0.660 |  | 6.23 |
| MAM | Maine & Maritimes Corporation | 35.70 | 34.45 | 35.00 | 2,700 | 1.05 | | 2.91 |
| MAO | Merrill Lynch & Co. Inc. | 4.810 | 4.750 | 4.750 | 37,200 | 0.040 | | 0.84 |
| MBA | CIBT Education Group Inc. | 0.4400 | 0.3700 | 0.3700 | 1,100 | 0.0300 | | 7.50 |
| MBB | iShares Trust | 102.8 | 101.4 | 102.7 | 121,400 | 0.3 |  | 0.25 |
| MBH | MBF Healthcare Acquisition Corp. | 7.850 | 7.850 | 7.850 | 1,600 | 0.040 | | 0.51 |
| MBH.U | MBF Healthcare Acquisition Corp. | 7.730 | 7.720 | 7.730 | 3,400 | 0.060 | | 0.77 |
| MBH.W | MBF Healthcare Acquisition Corp. | 0.0100 | 0.0100 | 0.0100 | 18,600 | 0.0000 |  | 0.00 |
| MBJ | Morgan Stanley | 5.020 | 4.550 | 4.870 | 11,800 | 0.040 | | 0.83 |
| MBK | Morgan Stanley Dean Witter & Co. | 10.56 | 10.45 | 10.47 | 2,400 | 0.13 | | 1.23 |
| MBR | Mercantile Bancorp Inc. (Quincey IL) | 12.00 | 12.00 | 12.00 | 900 | 0.01 | | 0.08 |
| MBS | MORGAN STANLEY | 6.910 | 5.230 | 6.910 | 22,500 | 1.500 | | 27.73 |
| MCB | Morgan Stanley Dean Witter & Co. | 15.97 | 15.97 | 15.97 | 100 | 0.08 | | 0.50 |
| MCF | Contango Oil & Gas Company | 41.80 | 36.57 | 41.80 | 215,500 | 5.25 | | 14.36 |
| MCP | Merrill Lynch & Co. Inc. | 9.580 | 9.580 | 9.580 | 1,000 | 0.000 | | 0.00 |
| MCZ | Mad Catz Interactive Inc | 0.3100 | 0.2700 | 0.2900 | 263,900 | 0.0100 | | 3.57 |
| MDD | SPDR Index Fund | 21.09 | 17.37 | 18.01 | 12,200 | 1.39 | | 8.36 |
| MDF | Metropolitan Health Networks Inc. | 1.720 | 1.460 | 1.500 | 104,800 | 0.020 | | 1.32 |
| MDM | Mountain Province Diamonds Inc. | 1.0000 | 0.9500 | 0.9800 | 21,200 | 0.0900 | | 10.11 |
| MDW | Midway Gold Corporation | 0.2400 | 0.1900 | 0.2400 | 215,400 | 0.0300 | | 14.29 |
| MDY | MidCap SPDR Trust Series I | 80.70 | 74.07 | 79.20 | 25,686,000 | 3.00 | | 3.94 |
| MEA | Metalico Inc | 1.700 | 1.360 | 1.600 | 350,300 | 0.260 | | 19.40 |
| MEJ | Santa Monica Media Corporation | 7.740 | 7.700 | 7.700 | 131,400 | 0.030 | | 0.39 |
| MEJ.U | Santa Monica Media Corporation | 7.800 | 7.600 | 7.600 | 200 | 0.690 | | 9.99 |
| MEJ.W | Santa Monica Media Corporation | 0.0500 | 0.0200 | 0.0500 | 16,700 | 0.0400 | | 400.00 |
| MES | MARKET VECTORS | 20.52 | 19.88 | 20.35 | 33,300 | 0.15 | | 0.74 |
| MFN | MineFinders Corp. Ltd. | 4.000 | 3.250 | 3.970 | 667,100 | 0.770 | | 24.06 |
| MFY | Merrill Lynch & Co. Inc. | 6.360 | 6.180 | 6.360 | 3,200 | 0.150 | | 2.42 |
| MGC | VANGUARD MEGACAP 300 | 28.12 | 26.00 | 28.12 | 132,000 | 1.64 | | 6.19 |
| MGH | Minco Gold Corporation | 0.2800 | 0.2500 | 0.2800 | 26,800 | 0.0300 | | 12.00 |
| MGK | VANGUARD MEGACP GR | 28.63 | 26.74 | 28.57 | 179,200 | 1.54 | | 5.70 |
| MGN | Mines Management Inc. | 0.7300 | 0.6100 | 0.7300 | 54,900 | 0.1300 | | 21.67 |
| MGT | MGT Capital Investments Inc | 0.7900 | 0.6000 | 0.7000 | 49,300 | 0.0000 | | 0.00 |
| MGV | VANGUARD MEGACP VAL | 27.40 | 25.50 | 27.40 | 53,900 | 1.52 | | 5.87 |
| MHE | Massachusetts Health and Education | 8.420 | 7.920 | 7.920 | 6,200 | 0.370 | | 4.46 |