Michael Bigham insider trades: Paratek Pharmaceuticals (PRTK) stock buys and sales
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
28 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 9, 2023 | PRTK | ↓ Sell10b5-1 | 31,250 | $2.20 | $69K | Direct | Aug 10, 2023 (1d) |
| Dec 21, 2022 | PRTK | ↓ Sell10b5-1 | 15,750 | $1.99 | $31K | Direct | Dec 22, 2022 (1d) |
| Dec 13, 2022 | PRTK | ↓ Sell10b5-1 | 51,375 | $1.97 | $101K | Direct | Dec 14, 2022 (1d) |
| Oct 28, 2022 | PRTK | ↓ Sell10b5-1 | 6,000 | $3.47 | $21K | Direct | Nov 1, 2022 (4d) |
| Aug 9, 2022 | PRTK | ↓ Sell10b5-1 | 28,637 | $2.66 | $76K | Direct | Aug 10, 2022 (1d) |
| Dec 15, 2021 | PRTK | ↓ Sell10b5-1 | 31,500 | $4.32 | $136K | Direct | Dec 15, 2021 (0d) |
| Aug 17, 2021 | PRTK | ↓ Sell10b5-1 | 32,030 | $5.12 | $164K | Direct | Aug 18, 2021 (1d) |
| Jun 4, 2021 | PRTK | ↓ Sell10b5-1 | 34,364 | $9.70 | $333K | Direct | Jun 8, 2021 (4d) |
| Dec 14, 2020 | PRTK | ↓ Sell10b5-1 | 44,400 | $6.81 | $302K | Direct | Dec 15, 2020 (1d) |
| Nov 13, 2020 | PRTK | ↓ Sell10b5-1 | 26,250 | $5.93 | $156K | Direct | Nov 16, 2020 (3d) |
| May 12, 2020 | PRTK | ↓ Sell | 12,250 | $4.68 | $57K | Direct | May 14, 2020 (2d) |
| Dec 12, 2018 | PRTK | ↓ Sell10b5-1 | 8,400 | $6.76 | $57K | Direct | Dec 14, 2018 (2d) |
| Oct 15, 2018 | PRTK | ↓ Sell10b5-1 | 6,300 | $8.96 | $56K | Direct | Oct 16, 2018 (1d) |
| Oct 3, 2018 | PRTK | ↓ Sell10b5-1 | 16,313 | $9.82 | $160K | Direct | Oct 4, 2018 (1d) |
| Jul 2, 2018 | PRTK | ↓ Sell10b5-1 | 22,500 | $9.97 | $224K | Direct | Jul 5, 2018 (3d) |
| Apr 9, 2018 | PRTK | ↓ Sell10b5-1 | 8,700 | $12.70 | $110K | Direct | Apr 10, 2018 (1d) |
| Feb 5, 2018 | PRTK | ↓ Sell10b5-1 | 4,000 | $14.22 | $57K | Direct | Feb 7, 2018 (2d) |
| Jul 5, 2017 | PRTK | ↓ Sell10b5-1 | 5,075 | $23.58 | $120K | Direct | Jul 6, 2017 (1d) |
| Feb 6, 2017 | PRTK | ↓ Sell10b5-1 | 5,000 | $15.09 | $75K | Direct | Feb 8, 2017 (2d) |
| Jun 23, 2016 | PRTK | ↑ Buy | 20,000 | $13.45 | $269K | Direct | Jun 27, 2016 (4d) |
| Mar 22, 2013 | SUPN | ↑ Buy | 25,000 | $5.50 | $137K | By Michael F Bigham CRUT U/A DTD 11/23/1 | Mar 26, 2013 (4d) |
| Mar 20, 2013 | SUPN | ↑ Buy | 5,000 | $5.20 | $26K | By Cabot Forbes Bigham Trust U/A DTD 10/ | Mar 26, 2013 (6d) |
| Mar 20, 2013 | SUPN | ↑ Buy | 5,000 | $5.17 | $26K | By Beatrice Emerson Bigham Trust U/A DTD | Mar 26, 2013 (6d) |
| Aug 11, 2005 | XGEN | ↑ Buy | 515,464 | $2.91 | $1.5M | By Abingworth Bioequities Master Fund Li | Aug 15, 2005 (4d) |
| Aug 11, 2005 | XGEN | ↑ Buy | 431,271 | $2.91 | $1.3M | By Abingworth Bioventures III A L.P. | Aug 15, 2005 (4d) |
| Aug 11, 2005 | XGEN | ↑ Buy | 263,265 | $2.91 | $766K | By Abingworth Bioventures III B L.P. | Aug 15, 2005 (4d) |
| Aug 11, 2005 | XGEN | ↑ Buy | 157,698 | $2.91 | $459K | By Abingworth Bioventures III C L.P. | Aug 15, 2005 (4d) |
| Aug 11, 2005 | XGEN | ↑ Buy | 6,873 | $2.91 | $20K | By Abingworth Bioventures III Executives | Aug 15, 2005 (4d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
About Michael Bigham's insider trades
Michael Bigham is Exec. Chairman of the Board at Paratek Pharmaceuticals (PRTK). Since Aug 11, 2005, Michael has reported 9 open-market purchases worth $4.5M and 19 sales worth $2.3M on SEC Form 4. There have been no open-market trades in the last 12 months.
18 sales (98% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include grants and awards (28 filings), other transactions (4 filings), shares returned to the company (3 filings), option exercises (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 PRTK insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.