- April 27, 2015 concludes the 180-day lockup period for SIEN, developer of medical aesthetics products, specifically silicone gel breast implants.
- At this point, SIEN's major pre-IPO shareholders will have a first chance to sell their holdings, likely flooding the market and temporarily depressing SIEN's share price.
- Research shows abnormal negative returns of ~(5%) in a window of approx. one week prior to the lockup expiration event.
- Given SIEN's growth, these insiders could be ready to take profits; investors should be ready for a short sale.
- Additional analysis here.
IPO Lockup Expiration - Sientra Inc. - 4.27
Analyst's Disclosure: The author is short SIEN.
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