M James Barrett - Net Worth and Insider Trading
M James Barrett Net Worth
The estimated net worth of M James Barrett is at least $2.4 Billion dollars as of 2025-04-28. M James Barrett is the 10% Owner of Tesaro Inc and owns about 9,681,633 shares of Tesaro Inc (TSRO) stock worth over $726 Million. M James Barrett is the 10% Owner of iShares Indl/Office Real Estate Capped and owns about 22,603,013 shares of iShares Indl/Office Real Estate Capped (FNIO) stock worth over $721 Million. M James Barrett is also the 10% Owner of Rhythm Pharmaceuticals Inc and owns about 4,909,956 shares of Rhythm Pharmaceuticals Inc (RYTM) stock worth over $313 Million. Besides these, M James Barrett also holds Ra Pharmaceuticals Inc (RARX) , Echo Global Logistics Inc (ECHO) , Groupon Inc (GRPN) , Boingo Wireless Inc (WIFI) , Ardelyx Inc (ARDX) , Liquidia Corp (LQDA) , Amicus Therapeutics Inc (FOLD) , Adaptimmune Therapeutics PLC (ADAP) , InnerWorkings Inc (INWK) , Senseonics Holdings Inc (SENS) , Millennial Media Inc (MM) , Epizyme Inc (EPZM) , Supernus Pharmaceuticals Inc (SUPN) , Surface Oncology Inc (SURF) , Mersana Therapeutics Inc (MRSN) , GlycoMimetics Inc (GLYC) , Tableau Software Inc (DATA) , Catalyst Biosciences Inc (CBIO) , Dermira Inc (DERM) , Proteostasis Therapeutics Inc (PTI) , Interleukin Genetics Inc (ILIU) , Clovis Oncology Inc (CLVSQ) , TRACON Pharmaceuticals Inc (TCON) , Novation Companies Inc (NOVCQ) , Zosano Pharma Corp (ZSANQ) , Appian Corp (APPN) . Details can be seen in M James Barrett's Latest Holdings Summary section.
Disclaimer: The insider information is derived from SEC filings. The estimated net worth is based on the final shares held after open market or private purchases and sales of common stock with a transaction code of "P" or "S" on Form 4, assuming that M James Barrett has not made any transactions after 2018-09-07 and currently still holds the listed stock(s). Please note that this estimate may not reflect the actual net worth.

Transaction Summary of M James Barrett
M James Barrett Insider Ownership Reports
Based on ownership reports from SEC filings, as the reporting owner, M James Barrett owns 60 companies in total, including Senseonics Holdings Inc (SENS) , PhaseBio Pharmaceuticals Inc (PHASQ) , and Clovis Oncology Inc (CLVSQ) among others .
Click here to see the complete history of M James Barrett’s form 4 insider trades.
Insider Ownership Summary of M James Barrett
Ticker | Company | Transaction Date | Type of Owner |
---|---|---|---|
SENS | Senseonics Holdings Inc | 2017-06-01 | director & 10 percent owner |
PHASQ | PhaseBio Pharmaceuticals Inc | 2018-10-17 | 10 percent owner |
CLVSQ | Clovis Oncology Inc | 2015-05-15 | director & 10 percent owner |
![]() | ![]() | 2018-09-07 | 10 percent owner |
![]() | ![]() | 2018-07-30 | 10 percent owner |
![]() | ![]() | 2018-07-24 | 10 percent owner |
![]() | ![]() | 2018-06-15 | director & 10 percent owner |
![]() | ![]() | 2016-07-18 | 10 percent owner |
![]() | ![]() | 2018-05-10 | director & 10 percent owner |
![]() | ![]() | 2018-05-01 | 10 percent owner |
![]() | ![]() | 2018-04-23 | 10 percent owner |
![]() | ![]() | 2018-03-27 | 10 percent owner |
![]() | ![]() | 2018-03-06 | 10 percent owner |
![]() | ![]() | 2018-02-26 | 10 percent owner |
![]() | ![]() | 2018-02-16 | 10 percent owner |
![]() | ![]() | 2017-11-27 | 10 percent owner |
![]() | ![]() | 2015-09-30 | 10 percent owner |
![]() | ![]() | 2018-01-01 | 10 percent owner |
![]() | ![]() | 2017-11-06 | 10 percent owner |
![]() | ![]() | 2017-10-10 | 10 percent owner |
![]() | ![]() | 2017-07-03 | 10 percent owner |
![]() | ![]() | 2017-06-28 | director & 10 percent owner |
![]() | ![]() | 2017-02-13 | director & 10 percent owner |
![]() | ![]() | 2016-07-29 | 10 percent owner |
![]() | ![]() | 2016-06-14 | 10 percent owner |
![]() | ![]() | 2015-12-08 | director & 10 percent owner |
![]() | ![]() | 2016-02-03 | 10 percent owner |
![]() | ![]() | 2016-01-12 | 10 percent owner |
![]() | ![]() | 2015-10-14 | 10 percent owner |
![]() | ![]() | 2015-07-28 | director & 10 percent owner |
![]() | ![]() | 2015-07-01 | 10 percent owner |
![]() | ![]() | 2015-03-11 | 10 percent owner |
![]() | ![]() | 2015-01-22 | 10 percent owner |
![]() | ![]() | 2014-12-19 | 10 percent owner |
![]() | ![]() | 2014-01-30 | 10 percent owner |
![]() | ![]() | 2014-12-02 | 10 percent owner |
![]() | ![]() | 2014-11-25 | 10 percent owner |
![]() | ![]() | 2014-10-08 | 10 percent owner |
![]() | ![]() | 2014-08-27 | 10 percent owner |
![]() | ![]() | 2012-03-07 | 10 percent owner |
![]() | ![]() | 2014-04-02 | 10 percent owner |
![]() | ![]() | 2013-05-22 | 10 percent owner |
![]() | ![]() | 2013-12-05 | director & 10 percent owner |
![]() | ![]() | 2013-10-29 | 10 percent owner |
![]() | ![]() | 2013-08-15 | 10 percent owner |
![]() | ![]() | 2012-10-11 | 10 percent owner |
![]() | ![]() | 2012-10-29 | 10 percent owner |
![]() | ![]() | 2012-03-28 | 10 percent owner |
![]() | ![]() | 2012-02-29 | 10 percent owner |
![]() | ![]() | 2011-08-08 | 10 percent owner |
![]() | ![]() | 2006-05-23 | 10 percent owner |
![]() | ![]() | 2011-03-10 | 10 percent owner |
![]() | ![]() | 2010-06-23 | 10 percent owner |
![]() | ![]() | 2009-05-08 | 10 percent owner |
![]() | ![]() | 2009-02-20 | 10 percent owner |
![]() | ![]() | 2006-05-09 | 10 percent owner |
![]() | ![]() | 2003-12-11 | 10 percent owner |
![]() | ![]() | 2009-04-03 | 10 percent owner |
![]() | ![]() | 2016-02-10 | director & 10 percent owner |
![]() | ![]() | 2016-02-10 | director & 10 percent owner |
M James Barrett Latest Holdings Summary
M James Barrett currently owns a total of 29 stocks. Among these stocks, M James Barrett owns 9,681,633 shares of Tesaro Inc (TSRO) as of March 6, 2018, with a value of $726 Million and a weighting of 30.56%. M James Barrett owns 22,603,013 shares of iShares Indl/Office Real Estate Capped (FNIO) as of February 6, 2012, with a value of $721 Million and a weighting of 30.35%. M James Barrett also owns 4,909,956 shares of Rhythm Pharmaceuticals Inc (RYTM) as of October 10, 2017, with a value of $313 Million and a weighting of 13.18%. The other 26 stocks Ra Pharmaceuticals Inc (RARX) , Echo Global Logistics Inc (ECHO) , Groupon Inc (GRPN) , Boingo Wireless Inc (WIFI) , Ardelyx Inc (ARDX) , Liquidia Corp (LQDA) , Amicus Therapeutics Inc (FOLD) , Adaptimmune Therapeutics PLC (ADAP) , InnerWorkings Inc (INWK) , Senseonics Holdings Inc (SENS) , Millennial Media Inc (MM) , Epizyme Inc (EPZM) , Supernus Pharmaceuticals Inc (SUPN) , Surface Oncology Inc (SURF) , Mersana Therapeutics Inc (MRSN) , GlycoMimetics Inc (GLYC) , Tableau Software Inc (DATA) , Catalyst Biosciences Inc (CBIO) , Dermira Inc (DERM) , Proteostasis Therapeutics Inc (PTI) , Interleukin Genetics Inc (ILIU) , Clovis Oncology Inc (CLVSQ) , TRACON Pharmaceuticals Inc (TCON) , Novation Companies Inc (NOVCQ) , Zosano Pharma Corp (ZSANQ) , Appian Corp (APPN) have a combined weighting of 25.91% among all his current holdings.
Latest Holdings of M James Barrett
Ticker | Company | Latest Transaction Date | Shares Owned | Current Price ($) | Current Value ($) |
---|---|---|---|---|---|
TSRO | Tesaro Inc | 2018-03-06 | 9,681,633 | 74.96 | 725,735,210 |
FNIO | iShares Indl/Office Real Estate Capped | 2012-02-06 | 22,603,013 | 31.89 | 720,810,085 |
RYTM | Rhythm Pharmaceuticals Inc | 2017-10-10 | 4,909,956 | 63.76 | 313,058,795 |
RARX | Ra Pharmaceuticals Inc | 2016-10-31 | 3,490,073 | 47.99 | 167,488,603 |
ECHO | Echo Global Logistics Inc | 2012-02-29 | 2,020,219 | 48.24 | 97,455,365 |
GRPN | Groupon Inc | 2013-08-15 | 3,709,248 | 19.89 | 73,776,943 |
WIFI | Boingo Wireless Inc | 2013-12-11 | 4,467,960 | 13.99 | 62,506,760 |
ARDX | Ardelyx Inc | 2016-07-18 | 8,752,543 | 5.26 | 46,038,376 |
LQDA | Liquidia Corp | 2018-07-30 | 2,484,870 | 14.12 | 35,086,364 |
FOLD | Amicus Therapeutics Inc | 2012-03-07 | 4,584,311 | 7.35 | 33,694,686 |
ADAP | Adaptimmune Therapeutics PLC | 2018-09-07 | 82,978,668 | 0.27 | 22,014,241 |
INWK | InnerWorkings Inc | 2012-02-29 | 6,029,190 | 2.99 | 18,027,278 |
SENS | Senseonics Holdings Inc | 2017-06-01 | 22,557,951 | 0.76 | 17,035,765 |
MM | Millennial Media Inc | 2012-10-29 | 8,196,614 | 1.75 | 14,344,075 |
EPZM | Epizyme Inc | 2016-01-12 | 6,260,851 | 1.47 | 9,203,451 |
SUPN | Supernus Pharmaceuticals Inc | 2015-12-08 | 230,710 | 32.22 | 7,433,476 |
SURF | Surface Oncology Inc | 2018-04-23 | 3,312,877 | 1.07 | 3,544,778 |
MRSN | Mersana Therapeutics Inc | 2017-07-03 | 8,140,138 | 0.36 | 2,962,196 |
GLYC | GlycoMimetics Inc | 2018-05-10 | 9,089,041 | 0.26 | 2,372,240 |
DATA | Tableau Software Inc | 2014-08-25 | 6,969 | 169.53 | 1,181,455 |
CBIO | Catalyst Biosciences Inc | 2013-12-05 | 43,462 | 7.67 | 333,332 |
DERM | Dermira Inc | 2014-10-02 | 17,241 | 18.75 | 323,269 |
PTI | Proteostasis Therapeutics Inc | 2017-12-18 | 277,731 | 1.11 | 308,281 |
ILIU | Interleukin Genetics Inc | 2016-07-29 | 55,418,811 | 0.00 | 249,385 |
CLVSQ | Clovis Oncology Inc | 2015-05-15 | 1,141,038 | 0.02 | 17,116 |
TCON | TRACON Pharmaceuticals Inc | 2018-03-27 | 17,330 | 0.03 | 558 |
NOVCQ | Novation Companies Inc | 2006-05-15 | 1,225,179 | 0.00 | 123 |
ZSANQ | Zosano Pharma Corp | 2017-02-13 | 1,361 | 0.00 | 0 |
APPN | Appian Corp | 2017-11-27 | 0 | 31.32 | 0 |
Holding Weightings of M James Barrett
M James Barrett Form 4 Trading Tracker
According to the SEC Form 4 filings, M James Barrett has made a total of 0 transactions in Tesaro Inc (TSRO) over the past 5 years. The most-recent trade in Tesaro Inc is the acquisition of 116,445 shares on March 6, 2018, which cost M James Barrett around $7 Million.
According to the SEC Form 4 filings, M James Barrett has made a total of 0 transactions in iShares Indl/Office Real Estate Capped (FNIO) over the past 5 years. The most-recent trade in iShares Indl/Office Real Estate Capped is the sale of 23,687 shares on February 6, 2012, which brought M James Barrett around $545,512.
According to the SEC Form 4 filings, M James Barrett has made a total of 0 transactions in Rhythm Pharmaceuticals Inc (RYTM) over the past 5 years. The most-recent trade in Rhythm Pharmaceuticals Inc is the acquisition of 550,000 shares on October 10, 2017, which cost M James Barrett around $9 Million.
More details on M James Barrett's insider transactions can be found in the Insider Trading History of M James Barrett table.Insider Trading History of M James Barrett
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M James Barrett Trading Performance
GuruFocus tracks the stock performance after each of M James Barrett's buying transactions within different timeframes. To be detailed, the average return of stocks after 3 months bought by M James Barrett is 22.9%. GuruFocus also compares M James Barrett's trading performance to market benchmark return within the same time period. The performance of stocks bought by M James Barrett within 3 months outperforms 20 times out of 31 transactions in total compared to the return of S&P 500 within the same period.
You can select different timeframes to see how M James Barrett's insider trading performs compared to the benchmark.
Performance of M James Barrett
M James Barrett Ownership Network
Ownership Network List of M James Barrett
Ownership Network Relation of M James Barrett

M James Barrett Owned Company Details
What does Senseonics Holdings Inc do?
Who are the key executives at Senseonics Holdings Inc?
M James Barrett is the director & 10 percent owner of Senseonics Holdings Inc. Other key executives at Senseonics Holdings Inc include Chief Financial Officer Frederick T. Sullivan , director & President & Chief Exec Officer Timothy T Goodnow , and VP Operations & Qual & Reg Mukul Jain .
Senseonics Holdings Inc (SENS) Insider Trades Summary
Over the past 18 months, M James Barrett made no insider transaction in Senseonics Holdings Inc (SENS). Other recent insider transactions involving Senseonics Holdings Inc (SENS) include a net purchase of 400,000 shares made by Douglas A Roeder , a net purchase of 315,000 shares made by Timothy T Goodnow , and a net purchase of 124,933 shares made by Frederick T. Sullivan .
In summary, during the past 3 months, insiders sold 0 shares of Senseonics Holdings Inc (SENS) in total and bought 0 shares, with a net sale of 0 shares. During the past 18 months, 0 shares of Senseonics Holdings Inc (SENS) were sold and 839,933 shares were bought by its insiders, resulting in a net purchase of 839,933 shares.
Senseonics Holdings Inc (SENS)'s detailed insider trading history can be found in Insider Trading Tracker table.
Senseonics Holdings Inc Insider Transactions
M James Barrett Mailing Address
Above is the net worth, insider trading, and ownership report for M James Barrett. Based on the public information released on the U.S. Securities and Exchange Commission (SEC) website, M James Barrett's mailing address is: Baltimore Md 21202.