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The 15:58pm Algo Strikes Again

|Includes: ARIA, BEAT, DIS, DVA, LEU, LOW, MPWR, Merck & Co Inc. (MRK), NGD, USB, VIAV, XLK

Just like all last week, the 15:58pm algo has struck again.  I do not yet know what this algo is doing but here's what it looked like today on HFT Alert.
Here we see it start up at 15:57:57 and turn off 1 minute later.  Upper image is per exchange.. and the lower image is in total.  Total stocks affected by this algorithm is up from last week's +450, it's now affecting over 500 issues.  Here's a partial list:

MRK,NGD, XLK JDSU, USU, ARIA, USB, MPWR, DVA, BEAT, LOW, DIS