Michael N Chang insider trades: Optimer Pharmaceuticals (OPTR) stock purchases
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Michael reports to the SEC
Open-market buys and sales
11 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Dec 29, 2009 | OPTR | ↑ Buy | 18,000 | $10.83 | $195K | Direct | Dec 29, 2009 (0d) |
| Nov 25, 2009 | OPTR | ↑ Buy | 15,000 | $11.52 | $173K | Direct | Nov 25, 2009 (0d) |
| Jun 13, 2008 | OPTR | ↑ Buy | 5,000 | $7.00 | $35K | Direct | Jun 17, 2008 (4d) |
| May 15, 2008 | OPTR | ↑ Buy | 2,500 | $6.04 | $15K | Direct | May 16, 2008 (1d) |
| May 15, 2008 | OPTR | ↑ Buy | 2,042 | $6.04 | $12K | spouse | May 16, 2008 (1d) |
| Nov 15, 2007 | OPTR | ↑ Buy | 1,000 | $5.95 | $6K | by spouse | Nov 19, 2007 (4d) |
| Nov 15, 2007 | OPTR | ↑ Buy | 1,000 | $5.95 | $6K | Direct | Nov 19, 2007 (4d) |
| Aug 9, 2007 | OPTR | ↑ Buy | 30,000 | $8.20 | $246K | Direct | Aug 10, 2007 (1d) |
| Aug 6, 2007 | OPTR | ↑ Buy | 10,000 | $9.05 | $91K | Direct | Aug 8, 2007 (2d) |
| Jul 16, 2007 | OPTR | ↑ Buy | 10,000 | $9.86 | $99K | Direct | Jul 18, 2007 (2d) |
| Feb 14, 2007 | OPTR | ↑ Buy | 114,965 | $7.00 | $805K | Direct | Feb 14, 2007 (0d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
About Michael N Chang's insider trades
Michael N Chang is a director at Optimer Pharmaceuticals (OPTR). Since Feb 14, 2007, Michael has reported 11 open-market purchases worth $1.7M and no sales on SEC Form 4. There have been no open-market trades in the last 12 months.
Their filings also include grants and awards (13 filings), option exercises (9 filings), other transactions (7 filings), gifts (3 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every OPTR insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.