The following are the U.S. stock options that had the biggest percentage changes in implied volatility from the previous trading day as of 11:30 a.m. in New York. This {OSCH <GO>} search was limited to options that are more than 10 days from expiration, have trading volume of at least 200 contracts and have strike prices within 5 percent of the underlying security's price.

Top Volatility Increases

                         Contract            %Chg  Impl.
Ticker    Name           Description          Vol.  Vol.   Price  %Chg  Volume
=============================================================================
PVH    PVH CORP     PVH US 04/21/12 C77.5     98.2  39.5   9.55    0.0   1000
UGI    UGI CORP     UGI US 04/21/12 C25       61.9  50.5   3.00  -28.6   1860
CMS    CMS ENERGY   CMS US 04/21/12 C22.5     48.4  17.1   0.25  150.0    385
KMI    KINDER MORG  KMI US 06/16/12 C35       38.4  11.1   1.85  -26.0    231
EXC    EXELON CORP  EXC US 04/21/12 C37       33.2  18.5   2.55   37.8    307
CEG    CONSTELLAT   CEG US 04/21/12 C36       29.2  14.3   0.80    6.7    226
SWHC   SMITH & WES  SWHC US 09/22/12 C3       28.9  81.4   3.96    1.5    350
DLR    DIGITAL REA  DLR US 04/21/12 C65       26.9  30.2   6.90    6.2   4680
MRK    MERCK & CO   MRK US 04/21/12 C34       24.4  33.1   3.95    8.2    437
IWM    ISHARES-RUS  IWM US 03/30/12 P85       23.9  19.2   4.41   17.0    385
RENN   RENREN INC-  RENN US 04/21/12 P4       23.1  94.8   0.05  -66.7    526
XOM    EXXON MOBIL  XOM US 04/21/12 C65       22.3  38.5  20.35    5.7    283
YOKU   YOUKU INC-A  YOKU US 06/16/12 P27      18.8  88.8   4.20  -14.3    342
MTGE   AMERICAN CA  MTGE US 06/16/12 C20      18.1  44.6   3.20   88.2    720
XOM    EXXON MOBIL  XOM US 04/21/12 C67.5     17.7  34.6  17.85    4.1    376
KMI    KINDER MORG  KMI US 04/21/12 C37.5     17.0  15.4   0.45  -40.0   1720
OREX   OREXIGEN TH  OREX US 04/21/12 P4       16.4 114.7   0.55  -15.4    846
YOKU   YOUKU INC-A  YOKU US 04/21/12 P29      15.2  88.2   3.50    0.0    214
ARIA   ARIAD PHARM  ARIA US 04/21/12 P12      14.6  76.1   0.35  -18.6    500
SCHW   SCHWAB (CHA  SCHW US 04/21/12 P12      14.5  42.3   0.10  100.0    200
RENN   RENREN INC-  RENN US 04/21/12 P5       13.9  80.9   0.33   10.0    210
NLY    ANNALY CAPI  NLY US 04/21/12 C17       13.8  16.6   0.04   33.3    493
ARIA   ARIAD PHARM  ARIA US 05/19/12 P11      13.7  70.6   0.30    0.0    200
QQQ    POWERSH-QQQ  QQQ US 03/30/12 P68       12.9  13.1   3.37    5.6    500
IWM    ISHARES-RUS  IWM US 03/30/12 P83       12.6  20.9   2.88   15.7   1486
PFE    PFIZER INC   PFE US 04/21/12 C19       11.4  25.8   2.59    0.8    291
RDS/A  ROYAL DUTCH  RDSA US 07/21/12 C72.5    11.2  20.1   2.62    2.8    502
RVBD   RIVERBED TE  RVBD US 04/21/12 C27      10.8  55.0   1.68  -13.8    472
RVBD   RIVERBED TE  RVBD US 04/21/12 P27      10.8  54.4   2.19   35.2    218
PBI    PITNEY BOWE  PBI US 04/21/12 C18       10.6  22.3   0.55   22.2    282
FIO    FUSION-IO I  FIO US 06/16/12 C22.5     10.5  58.2   9.47   -7.2    200
OVTI   OMNIVISION   OVTI US 04/21/12 C15      10.5  51.1   2.80  -15.2    401
YOKU   YOUKU INC-A  YOKU US 04/21/12 P21      10.2  95.0   0.50  -52.4    202
FSLR   FIRST SOLAR  FSLR US 04/21/12 P13      10.2 117.1   0.09   50.0    363
IWM    ISHARES-RUS  IWM US 03/30/12 P82       10.1  21.8   2.14    9.7    410
K      KELLOGG CO   K US 04/21/12 C55         10.0  12.1   0.20   53.9    235

Top Volatility Decreases

                         Contract            %Chg  Impl.
Ticker    Name           Description          Vol.  Vol.   Price  %Chg  Volume
=============================================================================
ICON   ICONIX BRAN  ICON US 05/19/12 C17.5   -79.0  33.0   0.75   -6.2    210
SWHC   SMITH & WES  SWHC US 06/16/12 C3      -31.2  70.2   3.89   -2.0    351
S      SPRINT NEXT  S US 05/19/12 C1         -30.1 110.4   1.80   -1.6    271
MCP    MOLYCORP IN  MCP US 04/21/12 C25      -28.7  34.1   6.30    9.6    259
MCP    MOLYCORP IN  MCP US 06/16/12 C25      -27.4  30.5   6.20    2.5   1423
MCP    MOLYCORP IN  MCP US 04/21/12 C26      -24.8  38.9   5.25    0.0    226
MCP    MOLYCORP IN  MCP US 06/16/12 C26      -23.8  31.7   5.75    8.5    794
MCP    MOLYCORP IN  MCP US 04/21/12 C31      -21.5  48.5   2.01  -21.8    507
MCP    MOLYCORP IN  MCP US 04/21/12 C30      -20.8  47.6   2.50  -14.7    569
MCP    MOLYCORP IN  MCP US 06/16/12 C30      -20.6  39.1   3.25   -9.7   1457
MCP    MOLYCORP IN  MCP US 04/21/12 C32      -18.6  50.9   1.67  -20.1   1323
MCP    MOLYCORP IN  MCP US 06/16/12 C31      -16.6  41.3   2.96    4.2    201
MCP    MOLYCORP IN  MCP US 06/16/12 C32.5    -16.1  42.7   2.20   -9.8    564
HUN    HUNTSMAN CO  HUN US 01/19/13 C5       -15.1  78.4   8.90    6.0    960
MCP    MOLYCORP IN  MCP US 04/21/12 P27      -13.6  63.5   0.89  -32.6    272
SIRI   SIRIUS XM R  SIRI US 09/22/12 C1.5    -12.2  46.5   0.86   19.4    502
CMA    COMERICA IN  CMA US 04/21/12 P15      -11.8  95.6   0.02  -60.0    200
AEA    ADVANCE AME  AEA US 10/20/12 P10      -11.3   6.2   0.05  -50.0    250
S      SPRINT NEXT  S US 05/19/12 P1.5       -10.8  91.2   0.03    0.0    303
HEK    HECKMANN CO  HEK US 04/21/12 C4       -10.5  59.2   0.65  -31.6    513

x - Ex-dividend. * - Ex-earnings.

-- Bloomberg News

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