| 2024-08-02 | Rothschild & Co Redburn | “Neutral” → “Buy” upgrade |
| 2022-04-06 | Wolfe Research | “Peer Perform” → “Perform” revised |
| 2022-02-02 | UBS | “Neutral” → “Buy” upgrade |
| 2022-01-31 | Piper Sandler | “Neutral” → “Overweight” upgrade |
| 2022-01-25 | Rothschild & Co Redburn | “Buy” → “Neutral” downgrade |
| 2022-01-21 | Citigroup | “Neutral” → “Buy” upgrade |
| 2022-01-10 | BTIG | “Neutral” → “Buy” upgrade |
| 2021-10-01 | Citigroup | “Buy” → “Neutral” downgrade |
| 2021-07-21 | Leerink Partners | “Market Perform” → “Perform” revised |
| 2021-06-01 | Evercore ISI | “Underperform” → “In Line” upgrade |
| 2021-04-21 | Baird | “Neutral” → “Outperform” upgrade |
| 2021-04-21 | Oppenheimer | “Underperform” → “Perform” upgrade |
| 2020-12-15 | Morgan Stanley | “Overweight” → “Equal Weight” downgrade |
| 2020-09-08 | Bank of America | “Buy” → “Neutral” downgrade |
| 2020-04-28 | Piper Sandler | “Overweight” → “Neutral” downgrade |
| 2020-04-17 | Leerink Partners | “Outperform” → “Market Perform” downgrade |
| 2020-04-09 | Evercore ISI | “In Line” → “Underperform” downgrade |
| 2020-04-01 | Oppenheimer | “Perform” → “Underperform” downgrade |
| 2020-01-27 | Deutsche Bank | “Buy” → “Hold” downgrade |
| 2018-10-19 | Canaccord Genuity | “Hold” → “Buy” upgrade |
| 2018-10-10 | Piper Sandler | “Neutral” → “Overweight” upgrade |
| 2017-01-04 | Evercore ISI | “Buy” → “Hold” downgrade |
| 2016-06-02 | Goldman Sachs | “Buy” → “Neutral” downgrade |
| 2016-04-01 | BTIG Research | “Buy” → “Neutral” downgrade |
| 2016-01-04 | Morgan Stanley | “Equal Weight” → “Overweight” upgrade |
| 2015-07-06 | Morgan Stanley | “Equal Weight” → “Underweight” downgrade |
| 2014-10-22 | Northland Securities | “Underperform” → “Market Perform” upgrade |
| 2014-10-22 | BTIG | “Neutral” → “Buy” upgrade |
| 2014-10-17 | Leerink Partners | “Market Perform” → “Outperform” upgrade |
| 2014-10-06 | Goldman Sachs | “Neutral” → “Buy” upgrade |
| 2014-09-22 | RBC Capital | “Sector Perform” → “Perform” revised |
| 2014-07-23 | Stifel | “Hold” → “Buy” upgrade |
| 2014-07-23 | Raymond James | “Market Perform” → “Outperform” upgrade |
| 2014-04-29 | Sterne Agee | “Underperform” → “Neutral” upgrade |
| 2014-04-02 | JMP Securities | “Market Underperform” → “Market Outperform” upgrade |
| 2014-03-04 | Cantor Fitzgerald | “Buy” → “Hold” downgrade |
| 2014-01-21 | Evercore ISI | “Strong Buy” → “Buy” downgrade |
| 2013-10-18 | Northland | “Market Perform” → “Underperform” downgrade |
| 2013-09-03 | First Analysis | “Equal Weight” → “Underweight” downgrade |
| 2013-07-19 | Northland Securities | “Underperform” → “Market Perform” upgrade |
| 2013-07-19 | JMP Securities | “Market Perform” → “Market Underperform” downgrade |
| 2013-07-09 | Goldman Sachs | “Buy” → “Neutral” downgrade |
| 2013-07-09 | Raymond James | “Outperform” → “Market Perform” downgrade |
| 2013-07-09 | Ameriprise Financial | “Buy” → “Sell” downgrade |
| 2013-07-09 | Canaccord Genuity | “Buy” → “Hold” downgrade |
| 2013-07-09 | JMP Securities | “Market Outperform” → “Market Perform” downgrade |
| 2013-03-18 | Canaccord Genuity | “Hold” → “Buy” upgrade |
| 2013-03-01 | Cantor Fitzgerald | “Hold” → “Buy” upgrade |
| 2013-02-22 | Goldman Sachs | “Neutral” → “Buy” upgrade |
| 2013-01-14 | Lazard | “Neutral” → “Buy” upgrade |
| 2012-10-31 | Barrington Research | “Market Perform” → “Outperform” upgrade |
| 2012-10-19 | Bank of America | “Neutral” → “Buy” upgrade |