| 13.87 Data as of May 24 |  +0.27 / +1.99%Today’s Change | 10.15 Today|||52-Week Range 17.15 | +23.29% Year-to-Date |
| Other institutional | 50.34% |
| Mutual fund holders | 33.38% |
| Individual stakeholders | 31.06% |
| 3/31/2013 | SECTORAL ASSET MANAGEMENT, INC. Bought 750.6 Thousand shares of Nxstage Medical Inc |
| 3/31/2013 | BROADVIEW ADVISORS LLC Bought 595.3 Thousand shares of Nxstage Medical Inc |
| 3/31/2013 | ORACLE INVESTMENT MANAGEMENT, IN... Bought 563.3 Thousand shares of Nxstage Medical Inc |
| Stockholder | Stake | Shares owned | Total value ($) | Shares bought / sold | Total change |
|---|---|---|---|---|---|
| Deerfield Management Co. LP | 8.20% | 4,898,227 | 54,713,196 | -856,634 | -14.89% |
| William Blair & Co. LLC (Investme... | 6.37% | 3,805,463 | 42,507,022 | -34,327 | -0.89% |
| Wells Capital Management, Inc. | 6.20% | 3,701,750 | 41,348,548 | -1,212,754 | -24.68% |
| Sectoral Asset Management, Inc. | 5.91% | 3,529,655 | 39,426,246 | +750,647 | +27.01% |
| BlackRock Fund Advisors | 4.91% | 2,935,517 | 32,789,725 | +226,687 | +8.37% |
| The Vanguard Group, Inc. | 4.80% | 2,866,548 | 32,019,341 | -10,472 | -0.36% |
| OrbiMed Advisors LLC | 4.57% | 2,730,143 | 30,495,697 | 0 | 0.00% |
| MFS Investment Management, Inc. | 3.79% | 2,266,466 | 25,316,425 | -25,100 | -1.10% |
| Cortina Asset Management LLC | 3.63% | 2,165,133 | 24,184,536 | +166,905 | +8.35% |
| WHV Investment Management, Inc. | 2.78% | 1,657,650 | 18,515,951 | +471,150 | +39.71% |
| Mutual fund | Stake | Shares owned | Total value ($) | Shares bought / sold | Total change |
|---|---|---|---|---|---|
| Government Pension Fund - Global ... | 3.80% | 2,267,321 | 25,325,976 | +2,006,124 | +768.05% |
| Wells Fargo Advantage Growth Fund | 3.10% | 1,854,000 | 20,709,180 | -226,146 | -10.87% |
| Wells Fargo Advantage Emerging Gr... | 1.92% | 1,145,560 | 12,795,905 | 0 | 0.00% |
| MFS New Discovery Fund | 1.86% | 1,111,124 | 12,411,255 | +12,740 | +1.16% |
| Vanguard Small Cap Index Fund | 1.47% | 879,382 | 9,822,697 | +61,479 | +7.52% |
| iShares Russell 2000 Index Fund | 1.36% | 813,789 | 9,090,023 | -18,741 | -2.25% |
| Vanguard Total Stock Market Index... | 1.17% | 697,004 | 7,785,535 | +69,590 | +11.09% |
| MFS Variable Insurance Trust-New ... | 1.12% | 666,421 | 7,443,923 | -6,270 | -0.93% |
| Fidelity Select Medical Equipment... | 1.09% | 650,000 | 7,260,500 | 0 | 0.00% |
| William Blair Growth Fund | 1.06% | 632,900 | 7,069,493 | 0 | 0.00% |
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