As indicated in other stock market posts, there are always reasons for big stock moves. A buying pressure which is higher than a selling pressure may lead to rising stocks. A higher selling pressure may even lead to would-be stock buyers to lower their bids or delay their stock purchase plans, which at times can make massive stock down-gaps, which are usually bigger than a man can imagine. Stocks are risky indeed. Is there a way to know if a stock is likely to make a big move sometime around the corner?

Some stocks have options trading on them (they are called optionable stocks). When there are investors and traders who know more or better than the average investor and trader about a given stock, they may buy options to leverage their bets (limit the loss and increase the potential reward). Such stock traders and stock investors may then buy cheap short term options. While one may not know if this more investor stock market participants would be betting on a rise of stock or on its fall, when this happens, the implied volatility for the shortest term options becomes very high compared to the implied volatility of the options that expire at a longer date. A way to see this in action may be to check a stock on the eve of its earning report. If there is an option expiring on that week, it is not unusual to see an implied volatility for the options expiring that week to be around 100% when the implied volatility of an options expiring just one to two months later could be say 45%, which leads to a difference of 55% unit of volatility (which is huge). When this difference between implied volatilities is significant, one may want to be on the look out for some sort of move in the stock. The stock could take a dive or the stock could rise, but the important point one is that one gets a warning that some sort of move might be coming soon. It is not unusual that stocks make gaps during such time periods.

Stock option implied volatility may serve as a "heat seeker" of a potential big stock move. Below is a list of optionable stocks, if one is interested in checking implied volatilities.

A stock screener generated the list of stocks below among the optionable stocks, and which have a monthly volty of 8% and higher. Multiple by square too of 12 to annualize the volatility.

Ticker Company Sector Industry
ABK Ambac Financial Group, Inc. Financial Surety & Title Insurance
FAZ Direxion Daily Financial Bear 3X Shares Financial Exchange Traded Fund
MGM MGM Resorts International Services Resorts & Casinos
FAS Direxion Daily Financial Bull 3X Shares Financial Exchange Traded Fund
HRB H&R Block, Inc. Services Personal Services
VXX iPath S&P 500 VIX Short-Term Futures ETN Financial Exchange Traded Fund
TZA Direxion Daily Small Cap Bear 3X Shares Financial Exchange Traded Fund
JASO JA Solar Holdings Co., Ltd. Technology Semiconductor - Specialized
MMR McMoRan Exploration Co. Basic Materials Independent Oil & Gas
PMI PMI Group Inc. Financial Surety & Title Insurance
LDK LDK Solar Co., Ltd. Technology Semiconductor - Broad Line
TNA Direxion Daily Small Cap Bull 3X Shares Financial Exchange Traded Fund
GCI Gannett Co., Inc. Services Publishing - Newspapers
MTG MGIC Investment Corp. Financial Surety & Title Insurance
YRCWD YRC Worldwide, Inc. Services Trucking
ESLR Evergreen Solar Inc. Services Technical Services
FHN First Horizon National Corp. Financial Regional - Southeast Banks
ENTR Entropic Communications, Inc. Technology Semiconductor - Broad Line
ODP Office Depot, Inc. Services Specialty Retail, Other
REE Rare Element Resources Ltd. Basic Materials Industrial Metals & Minerals
MBI MBIA Inc. Financial Surety & Title Insurance
SOL ReneSola Ltd. Technology Semiconductor - Integrated Circuits
SNV Synovus Financial Corp. Financial Regional - Mid-Atlantic Banks
TSL Trina Solar Ltd. Technology Semiconductor - Specialized
SOLF Solarfun Power Holdings Co. Ltd. Technology Semiconductor - Specialized
SKS Saks Incorporated Services Department Stores
PPHM Peregrine Pharmaceuticals Inc. Healthcare Biotechnology
STP Suntech Power Holdings Co. Ltd. Technology Diversified Electronics
NIHD NII Holdings Inc. Technology Wireless Communications
ARNA Arena Pharmaceuticals, Inc. Healthcare Drug Manufacturers - Other
COCO Corinthian Colleges Inc. Services Education & Training Services
YGE Yingli Green Energy Holding Co. Ltd. Technology Semiconductor - Integrated Circuits
RDN Radian Group Inc. Financial Surety & Title Insurance
MCP Molycorp, Inc. Basic Materials Industrial Metals & Minerals
CIGX Star Scientific, Inc. Consumer Goods Cigarettes
GMCR Green Mountain Coffee Roasters Inc. Consumer Goods Processed & Packaged Goods
SOMX Somaxon Pharmaceuticals, Inc. Healthcare Drug Manufacturers - Other
BZH Beazer Homes USA Inc. Industrial Goods Residential Construction
EXXI Energy XXI (Bermuda) Limited Basic Materials Oil & Gas Equipment & Services
SATC Satcon Technology Corporation Technology Semiconductor - Integrated Circuits
AGO Assured Guaranty Ltd. Financial Surety & Title Insurance
FBP First Bancorp Financial Foreign Regional Banks
PWER Power-One Inc. Technology Diversified Electronics
RAS RAIT Financial Trust Financial Property Management
TGB Taseko Mines Ltd. Basic Materials Copper
CHRS Charming Shoppes Inc. Services Apparel Stores
DNN Denison Mines Corp. Basic Materials Industrial Metals & Minerals
SIGA SIGA Technologies, Inc. Healthcare Drug Manufacturers - Other
JOE The St. Joe Company Financial Real Estate Development
CTIC Cell Therapeutics, Inc. Healthcare Biotechnology
LOCM Local.com Corp. Technology Internet Information Providers
CCME China MediaExpress Holdings, Inc. Financial Diversified Investments
ZAGG ZAGG Incorporated Services Specialty Retail, Other
AVNR Avanir Pharmaceuticals Healthcare Drug Manufacturers - Other
WL Wilmington Trust Corporation Financial Regional - Mid-Atlantic Banks
OCNF OceanFreight, Inc. Services Shipping
ISTA ISTA Pharmaceuticals Inc. Healthcare Drug Manufacturers - Other
ATPG ATP Oil & Gas Corp. Basic Materials Independent Oil & Gas
VECO Veeco Instruments Inc. Technology Semiconductor Equipment & Materials
ADTN ADTRAN Inc. Technology Communication Equipment
EXEL Exelixis, Inc. Healthcare Biotechnology
LNET LodgeNet Interactive Corporation Services CATV Systems
HERO Hercules Offshore, Inc. Basic Materials Oil & Gas Drilling & Exploration
IRE The Governor and Company of The Bank of Ireland Financial Foreign Regional Banks
GMXR GMX Resources Inc. Basic Materials Independent Oil & Gas
WNC Wabash National Corp. Consumer Goods Trucks & Other Vehicles
OMEX Odyssey Marine Exploration Inc. Services Research Services
CSIQ Canadian Solar Inc. Technology Semiconductor - Specialized
BIOD Biodel Inc. Healthcare Drug Manufacturers - Other
KERX Keryx Biopharmaceuticals Inc. Healthcare Drug Manufacturers - Major
IMGN Immunogen Inc. Healthcare Biotechnology
FINL Finish Line Inc. Services Apparel Stores
KRY Crystallex International Corp. Basic Materials Gold
AONE A123 Systems, Inc. Industrial Goods Industrial Electrical Equipment
JADE LJ International Inc. Consumer Goods Recreational Goods, Other
FSII FSI International Inc. Technology Semiconductor Equipment & Materials
TRID Trident Microsystems Inc. Technology Semiconductor - Specialized
WNR Western Refining Inc. Basic Materials Oil & Gas Refining & Marketing
BQI Oilsands Quest, Inc. Basic Materials Nonmetallic Mineral Mining
BYD Boyd Gaming Corp. Services Resorts & Casinos
ASTI Ascent Solar Technologies, Inc. Technology Semiconductor - Specialized
FUQI Fuqi International, Inc. Consumer Goods Recreational Goods, Other
GERN Geron Corporation Healthcare Drug Manufacturers - Other
MYGN Myriad Genetics Inc. Healthcare Drug Manufacturers - Major
DPTR Delta Petroleum Corp. Basic Materials Independent Oil & Gas
VLNC Valence Technology Inc. Industrial Goods Industrial Electrical Equipment
CAGC China Agritech Inc. Services Business Services
PCBC Pacific Capital Bancorp Financial Regional - Pacific Banks
SMOD SMART Modular Technologies (WWH) Inc. Technology Semiconductor - Integrated Circuits
RZ Raser Technologies, Inc. Industrial Goods Industrial Electrical Equipment
SPRD Spreadtrum Communications Inc. Technology Semiconductor - Broad Line
EXK Endeavour Silver Corp. Basic Materials Silver
IMMU Immunomedics Inc. Healthcare Diagnostic Substances
BGP Borders Group, Inc. Services Catalog & Mail Order Houses
GKK Gramercy Capital Corp. Financial Property Management
GLCH Gleacher & Company, Inc Financial Investment Brokerage - Regional
ENER Energy Conversion Devices, Inc. Technology Semiconductor - Specialized
DRWI DragonWave Inc. Technology Communication Equipment
DCTH Delcath Systems Inc. Healthcare Drug Delivery
NVTL Novatel Wireless Inc. Technology Business Software & Services
CGA China Green Agriculture, Inc. Basic Materials Agricultural Chemicals
CDII China Direct Industries, Inc. Financial Diversified Investments
NLST Netlist Inc. Technology Semiconductor- Memory Chips
EMKR EMCORE Corporation Technology Semiconductor - Integrated Circuits
RBCN Rubicon Technology, Inc. Technology Semiconductor - Specialized
TSYS TeleCommunication Systems Inc. Technology Communication Equipment
PWAV Powerwave Technologies Inc. Technology Communication Equipment
PLAB Photronics Inc. Technology Semiconductor - Integrated Circuits
ACOR Acorda Therapeutics, Inc. Healthcare Biotechnology
JMBA Jamba, Inc. Consumer Goods Processed & Packaged Goods
MEDQ MedQuist Inc. Technology Healthcare Information Services
VHC VirnetX Holding Corp Technology Internet Software & Services
MNI The McClatchy Company Services Publishing - Newspapers
EDMC Education Management Corporation Services Education & Training Services
AEIS Advanced Energy Industries, Inc. Technology Diversified Electronics
NVAX Novavax, Inc. Healthcare Biotechnology
JTX Jackson Hewitt Tax Service Inc. Services Personal Services
GU Gushan Environmental Energy Limited Basic Materials Specialty Chemicals
GORO Gold Resource Corp Basic Materials Gold
CNIT China Information Technology, Inc. Technology Application Software
CNXT Conexant Systems Inc. Technology Semiconductor - Integrated Circuits
PLUG Plug Power Inc. Industrial Goods Industrial Electrical Equipment
CHBT China-Biotics, Inc. Healthcare Drug Related Products
PNX Phoenix Companies Inc. Financial Life Insurance
TNDM Neutral Tandem, Inc. Technology Wireless Communications
GIGM GigaMedia Ltd. Technology Multimedia & Graphics Software
CMFO China Marine Food Group Limited Consumer Goods Processed & Packaged Goods
PWRD Perfect World Co., Ltd. Technology Application Software
IDT IDT Corporation Technology Diversified Communication Services
AFFY Affymax, Inc. Healthcare Biotechnology
NLS Nautilus Inc. Consumer Goods Sporting Goods
DSTI DayStar Technologies Inc. Technology Semiconductor - Specialized
CBLI Cleveland BioLabs, Inc. Services Research Services
SMSI Smith Micro Software Inc. Technology Application Software
PCYC Pharmacyclics Inc. Healthcare Drug Manufacturers - Other
DGW Duoyuan Global Water Inc. Industrial Goods Pollution & Treatment Controls
GGC Georgia Gulf Corp. Basic Materials Synthetics
THQI THQ Inc. Technology Multimedia & Graphics Software
MSB Mesabi Trust Financial Diversified Investments
WATG Wonder Auto Technology, Inc. Consumer Goods Auto Parts
GAP The Great Atlantic & Pacific Tea Company, Inc. Services Grocery Stores
UCBI United Community Banks, Inc. Financial Regional - Mid-Atlantic Banks
ZLC Zale Corporation Services Jewelry Stores
IDIX Idenix Pharmaceuticals Inc. Healthcare Biotechnology
JST Jinpan International Ltd. Technology Diversified Electronics
REXX Rex Energy Corporation Basic Materials Oil & Gas Drilling & Exploration
BPI Bridgepoint Education, Inc. Services Education & Training Services
ANDS Anadys Pharmaceuticals Inc. Healthcare Biotechnology
STSA Sterling Financial Corp. Financial Savings & Loans
TRGL Toreador Resources Corp. Basic Materials Independent Oil & Gas
NEP China North East Petroleum Holdings Limited Basic Materials Oil & Gas Drilling & Exploration
BWEN Broadwind Energy, Inc. Industrial Goods Diversified Machinery
BAS Basic Energy Services, Inc. Basic Materials Oil & Gas Equipment & Services
PVA Penn Virginia Corp. Basic Materials Independent Oil & Gas
WEST Akeena Solar, Inc. Services Electronics Wholesale
NGAS NGAS Resources Inc. Basic Materials Oil & Gas Drilling & Exploration
ORN Orion Marine Group, Inc Industrial Goods Heavy Construction
SUPG SuperGen Inc. Healthcare Drug Manufacturers - Other
ASYS Amtech Systems Inc. Technology Semiconductor Equipment & Materials
WGO Winnebago Industries Inc. Consumer Goods Recreational Vehicles
SCSS Select Comfort Corporation Consumer Goods Home Furnishings & Fixtures
BSDM BSD Medical Corp. Healthcare Medical Appliances & Equipment
LEE Lee Enterprises Inc. Services Publishing - Newspapers
MTSN Mattson Technology Inc. Technology Semiconductor Equipment & Materials
STV China Digital TV Holding Co., Ltd. Technology Application Software
SNIC Sonic Solutions Technology Business Software & Services
SOXL Direxion Daily Semicondct Bull 3X Shares Financial Exchange Traded Fund
CAK CAMAC Energy Inc. Basic Materials Oil & Gas Drilling & Exploration
BBX BankAtlantic Bancorp Inc. Financial Savings & Loans
HEV Ener1, Inc. Industrial Goods Industrial Electrical Equipment
LNG Cheniere Energy, Inc. Basic Materials Oil & Gas Drilling & Exploration
TUES Tuesday Morning Corp. Services Discount, Variety Stores
REDF Rediff.com India Ltd. Technology Internet Information Providers
PSDV pSivida Corp. Healthcare Drug Delivery
APPY AspenBio Pharma Inc. Healthcare Diagnostic Substances
XING Qiao Xing Universal Resources, Inc. Basic Materials Industrial Metals & Minerals
NCT Newcastle Investment Corp. Financial REIT - Diversified
DRL Doral Financial Corp. Financial Mortgage Investment
CHLN China Housing and Land Development, Inc. Financial Property Management
HEAT SmartHeat Inc. Industrial Goods Industrial Equipment & Components
CTDC China Technology Development Group Corporation Industrial Goods Industrial Equipment & Components
PURE Pure Bioscience Basic Materials Chemicals - Major Diversified
BONT Bon-Ton Stores Inc. Services Department Stores
GOK Geokinetics Inc. Basic Materials Oil & Gas Equipment & Services
CSUN China Sunergy Co. Ltd. Technology Semiconductor - Integrated Circuits
JAZZ Jazz Pharmaceuticals, Inc. Healthcare Biotechnology
CPLA Capella Education Co. Services Education & Training Services
DEER Deer Consumer Products, Inc. Consumer Goods Appliances
NWY New York & Company Inc. Services Apparel Stores
FBN Furniture Brands International Inc. Consumer Goods Home Furnishings & Fixtures
STRI STR Holdings, Inc. Technology Semiconductor - Specialized
CBR CIBER, Inc. Technology Information Technology Services
HNSN Hansen Medical, Inc. Healthcare Medical Appliances & Equipment
CBEH China Integrated Energy, Inc. Basic Materials Oil & Gas Refining & Marketing
QUIK QuickLogic Corp. Technology Semiconductor - Integrated Circuits
JOBS 51job Inc. Services Staffing & Outsourcing Services
KITD KIT digital, Inc. Services Entertainment - Diversified
KV-A KV Pharmaceutical Co. Healthcare Drug Delivery
LOPE Grand Canyon Education, Inc. Services Education & Training Services
HTHT China Lodging Group, Limited Services Lodging
SUF Sulphco Inc. Basic Materials Oil & Gas Refining & Marketing
SCLN SciClone Pharmaceuticals, Inc. Healthcare Drug Manufacturers - Other
AVNW Aviat Networks, Inc. Technology Communication Equipment
ANPI Angiotech Pharmaceuticals Inc. Healthcare Drug Manufacturers - Other
TOMO TomoTherapy Incorporated Healthcare Medical Appliances & Equipment
GBX Greenbrier Companies Services Railroads
WAVX Wave Systems Corp. Technology Computer Peripherals
AMCN AirMedia Group Inc. Services Marketing Services
SRI Stoneridge Inc. Consumer Goods Auto Parts
RUTH Ruth's Hospitality Group Inc. Services Restaurants
KNDI Kandi Technologies, Corp Consumer Goods Trucks & Other Vehicles
SIMO Silicon Motion Technology Corp. Technology Diversified Electronics
IBOC International Bancshares Corp. Financial Regional - Southwest Banks
FTK Flotek Industries Inc. Basic Materials Oil & Gas Equipment & Services
MCHX Marchex, Inc. Services Marketing Services
WPP Wausau Paper Corp. Consumer Goods Paper & Paper Products
CAEI China Architectural Engineering, Inc. Industrial Goods General Contractors
RDNT RadNet, Inc. Healthcare Medical Laboratories & Research
RNOW Rightnow Technologies Inc. Technology Application Software
SOXS Direxion Daily Semicondct Bear 3X Shares Financial Exchange Traded Fund
CEU China Education Alliance Inc. Services Education & Training Services
LINC Lincoln Educational Services Corporation Services Education & Training Services
LIOX Lionbridge Technologies Inc. Technology Internet Software & Services
SGMO Sangamo Biosciences Inc. Healthcare Biotechnology
MBLX Metabolix, Inc. Basic Materials Specialty Chemicals
VRS Verso Paper Corp. Consumer Goods Paper & Paper Products
HAWK Seahawk Drilling, Inc. Basic Materials Oil & Gas Drilling & Exploration
ETM Entercom Communications Corp. Services Broadcasting - Radio
JRN Journal Communications Inc. Services Publishing - Newspapers
VASC Vascular Solutions Inc. Healthcare Medical Instruments & Supplies
ININ Interactive Intelligence, Inc. Technology Business Software & Services
PGNX Progenics Pharmaceuticals Inc. Healthcare Biotechnology
RPTP Raptor Pharmaceuticals Corp. Healthcare Diagnostic Substances
ENG ENGlobal Corp. Services Technical Services
GROW U.S. Global Investors, Inc. Financial Asset Management
QLIK Qlik Technologies, Inc. Technology Business Software & Services
ENZ Enzo Biochem Inc. Healthcare Medical Laboratories & Research
OSTK Overstock.com Inc. Services Catalog & Mail Order Houses
SCOK SinoCoking and Coke Chemical Industries, Inc. Services Business Services
OCLS Oculus Innovative Sciences, Inc. Healthcare Medical Instruments & Supplies
BTIM BioTime, Inc. Healthcare Biotechnology
AATI Advanced Analogic Technologies, Inc. Technology Semiconductor - Specialized
RXII RXi Pharmaceuticals Corporation Healthcare Biotechnology
GTXI GTX Inc. Healthcare Biotechnology
NILE Blue Nile Inc. Services Catalog & Mail Order Houses
AUDC AudioCodes Ltd. Technology Communication Equipment
HUSA Houston American Energy Corp. Basic Materials Independent Oil & Gas
IMMR Immersion Corporation Technology Computer Peripherals
AGM Federal Agricultural Mortgage Corp. Financial Credit Services
OPXA Opexa Therapeutics, Inc. Healthcare Biotechnology
PTIE Pain Therapeutics Inc. Healthcare Drug Manufacturers - Other
RODM Rodman & Renshaw Capital Group, Inc. Financial Investment Brokerage - National
ORBC ORBCOMM, Inc. Technology Diversified Communication Services
YTEC Yucheng Technologies Limited Technology Business Software & Services
SRTY ProShares UltraPro Short Russell2000 Financial Exchange Traded Fund
ADLR Adolor Corp. Healthcare Drug Manufacturers - Other
FXEN FX Energy Inc. Basic Materials Oil & Gas Drilling & Exploration
GGR GeoGlobal Resources Inc. Basic Materials Oil & Gas Drilling & Exploration
NMTI NMT Medical Inc. Healthcare Medical Instruments & Supplies
MRNA Marina Biotech, Inc. Healthcare Biotechnology
KONG Kongzhong Corp. Services Business Services
HOKU Hoku Corporation Technology Diversified Electronics
SPTN Spartan Stores Inc. Services Food Wholesale
PRKR Parkervision Inc. Technology Semiconductor - Integrated Circuits
ROCK Gibraltar Industries, Inc. Basic Materials Steel & Iron
CLSN Celsion Corp. Healthcare Medical Appliances & Equipment
BDSI BioDelivery Sciences International Inc. Healthcare Biotechnology
PRXI Premier Exhibitions Inc. Services General Entertainment
BRNC Bronco Drilling Co. Inc. Basic Materials Oil & Gas Drilling & Exploration
NWPX Northwest Pipe Co. Basic Materials Steel & Iron
CORT Corcept Therapeutics Inc. Healthcare Biotechnology
VRNM Verenium Corporation Basic Materials Specialty Chemicals
HEES H&E Equipment Services Inc. Industrial Goods Industrial Equipment & Components

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