These are this Wednesday’s top day trader and active stock alerts.  We have more detailed data on volume and price analysis with links through to VSInvestor.com on each stock:

BB&T Corp. (NYSE: BBT) was down about 1% after its secondary offering after S&P weighting changes.

Alcoa, Inc. (NYSE: AA) is down about 4% after an analyst downgrade from Goldman Sachs.

Century Aluminum Company (NASDAQ: CENX) is getting clipped by more than 6% this morning after yesterday’s gains.

Gentium S.p.A (NASDAQ: GENT) is surging on mixed Phase III treatment trial of Defibrotide for severe veno-occlusive disease.

EnerSys (NYSE: ENS) is indicated much lower on an insider-backer share sale of 3.2 million shares to Goldman Sachs.

Hewlett-Packard (NYSE: HPQ) is down after earnings, and we made some support calculations for key levels to watch in the coming days if the weakness persists here.

Cerus Corporation (NASDAQ: CERS) is seeing a huge surge on news that Swissmedic has approved the use of platelet components treated with Cerus’ INTERCEPT Blood System.

This volume took place late yesterday, but we started seeing elevated put and call options trading in Apple Inc. (NASDAQ: AAPL).  This could have been H-P related or it could have merely been options rolling trades from August to September ahead of Friday’s expiration.  So far AAPL shares are down less than 1% at $162.75 on only 100,000 shares.

-The 24/7 Wall Street Team