Today’s tickers: ATVI, CECO, TRGT & RENN ATVI  - Activision Blizzard, Inc. –  Shares in video game developer Activision Blizzard went the way of the broad market this morning, declining 2.05% to $11.99 in the first half of the trading session. Activity in Activision options indicate one strategist doubts shares will rebound in the first half of 2012. It looks like the trader sold two chunks of 3,717 call options at both the May 2012 $12 and $13 strikes to pocket premiums of $1.00 and $0.54 per contract, respectively. The investor responsible for the transaction retains the full amount of premium as long as shares in ATVI trade below $12.00, and the calls land out-of-the-money at expiration day in May. CECO  - Career Education Corp. –  Put selling on the provider of for-profit education services suggests one investor is betting shares in Career Education Corp. are unlikely to realize sharp losses during the next five weeks to January 2012 expiration. Shares in CECO are up 0.60% to stand at $7.18 in early-afternoon trade. The investor responsible for generating nearly all of the volume in Career Education Corp. options today appears to have sold 5,700 puts at the Jan. 2012 $6.0 strike for a premium of $0.35 each. The trader walks away with the full amount of premium in hand as long as CECO’s shares exceed $6.00 at expiration day next year. But, if shares drop and the put options land in-the-money, the investor may be obliged to purchase 500,000 shares of the underlying at $6.00 each regardless of where shares trade in the open market. The premium received for bearing this risk acts as a limited buffer against losses on the downside. Losses kick in if shares in CECO plunge 21.3% to breach the effective breakeven price of $5.65 at expiration.…