$34.75 (week's change: -7.6%)
52-week return: +40.2%
Long Island's biggest company in terms of sales had its largest weekly point drop since May 2010 after forecasting third-quarter revenue and profit less than analysts' estimates.
Tii Network Technologies
$2.20 (week's change: -10.9%)
52-week return: +35.8%
Shares fell to a seven-month low after the provider of equipment used in the telecommunications industry disclosed in a government filing that it had changed auditing firms.
Read more of Inside Long Island Business