Caroline Dorsa insider trades: Biogen (BIIB) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Caroline reports to the SEC
and 2 more companies
Open-market buys and sales
21 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| May 2, 2025 | BIIB | ↑ Buy | 1,235 | $122.72 | $152K | Direct | May 5, 2025 (3d) |
| Jun 10, 2021 | ILMN | ↓ Sell10b5-1 | 1,000 | $450.00 | $450K | Direct | Jun 14, 2021 (4d) |
| Apr 5, 2021 | NTLA | ↓ Sell | 7,500 | $82.19 | $616K | Direct | Apr 6, 2021 (1d) |
| Sep 22, 2016 | BIIB | ↓ Sell | 27,570 | $314.00 | $8.7M | Direct | Sep 26, 2016 (4d) |
| Aug 5, 2015 | PEG | ↓ Sell | 26,563 | $41.15 | $1.1M | Direct | Aug 6, 2015 (1d) |
| Aug 5, 2015 | PEG | ↓ Sell | 20,528 | $41.14 | $844K | Direct | Aug 6, 2015 (1d) |
| Aug 4, 2015 | PEG | ↓ Sell | 80,309 | $41.10 | $3.3M | Direct | Aug 5, 2015 (1d) |
| Mar 20, 2014 | BIIB | ↓ Sell | 10,000 | $348.88 | $3.5M | Direct | Mar 21, 2014 (1d) |
| Oct 31, 2013 | PEG | ↑ Buy | 1,000 | $33.04 | $33K | Direct | Oct 31, 2013 (0d) |
| May 22, 2012 | PEG | ↑ Buy | 1,700 | $30.94 | $53K | Direct | May 23, 2012 (1d) |
| Aug 9, 2011 | PEG | ↑ Buy | 2,000 | $29.17 | $58K | Direct | Aug 10, 2011 (1d) |
| Aug 13, 2010 | BIIB | ↑ Buy | 177 | $56.41 | $10K | Direct | Aug 17, 2010 (4d) |
| Jul 30, 2010 | BIIB | ↑ Buy | 183 | $54.57 | $10K | Direct | Aug 3, 2010 (4d) |
| Jul 16, 2010 | BIIB | ↑ Buy | 185 | $53.71 | $10K | Direct | Jul 19, 2010 (3d) |
| Jun 30, 2010 | BIIB | ↑ Buy | 205 | $48.63 | $10K | Direct | Jul 1, 2010 (1d) |
| Jun 18, 2010 | BIIB | ↑ Buy | 203 | $49.15 | $10K | Direct | Jun 21, 2010 (3d) |
| May 28, 2010 | BIIB | ↑ Buy | 208 | $48.01 | $10K | Direct | Jun 1, 2010 (4d) |
| May 14, 2010 | BIIB | ↑ Buy | 195 | $51.19 | $10K | Direct | May 17, 2010 (3d) |
| Apr 30, 2010 | BIIB | ↑ Buy | 187 | $53.38 | $10K | Direct | May 3, 2010 (3d) |
| Mar 1, 2010 | PEG | ↑ Buy | 2,000 | $29.94 | $60K | Direct | Mar 2, 2010 (1d) |
| Feb 7, 2006 | (MRK) | ↓ Sell | 63,299 | $34.05 | $2.2M | Direct | Feb 8, 2006 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other BIIB insiders
Open-market trades in the last 12 months
About Caroline Dorsa's insider trades
Caroline Dorsa is a director at Biogen (BIIB). Since Feb 7, 2006, Caroline has reported 13 open-market purchases worth $435K and 8 sales worth $20.6M on SEC Form 4. There have been no open-market trades in the last 12 months.
1 sale (2% of the value sold) was made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so it says little about how the insider sees the stock today.
Their filings also include grants and awards (60 filings), shares withheld for taxes (14 filings), option exercises (7 filings), shares returned to the company (2 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 BIIB insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.