RE:May be a stupid question,,,,,,,,,,Can't really say what caused the sell-off. I can however show which investment firms are reducing their position and who is increasing. Interestingly Scotia, BMO, TD and RBC all seem to have increased their holdings in QHR since Monday, March 30, 2015.
| | Shares Traded last week | Shares Traded this week | |
| House | Bought | Sold | Net | Bought | Sold | Net | Change in position |
| 87 Beacon | 244,100 | 295,100 | -51,000 | 386,034 | 393,534 | -7,500 | -58,500 |
| 16 Paradigm | 17,100 | 18,700 | -1,600 | 0 | 39,500 | -39,500 | -41,100 |
| 79 CIBC | 29,297 | 63,170 | -33,873 | 2,607 | 0 | 2,607 | -31,266 |
| 76 Industrial Alliance | 0 | 13,600 | -13,600 | 0 | 8,800 | -8,800 | -22,400 |
| 48 Laurentian | 0 | 3,300 | -3,300 | 0 | 1,273 | -1,273 | -4,573 |
| 88 Credential | 400 | 7,207 | -6,807 | 3,000 | 0 | 3,000 | -3,807 |
| 124 Questrade | 850 | 3,200 | -2,350 | 1,500 | 0 | 1,500 | -850 |
| 58 Qtrade | 6,762 | 7,500 | -738 | 0 | 0 | 0 | -738 |
| 59 PI | 324 | 852 | -528 | 143 | 107 | 36 | -492 |
| 39 Merrill Lynch | 0 | 200 | -200 | 0 | 0 | 0 | -200 |
| 99 Jitney | 2,000 | 2,000 | 0 | 500 | 500 | 0 | 0 |
| 13 Instinet | 2,000 | 0 | 2,000 | 6,000 | 7,900 | -1,900 | 100 |
| 28 BBS | 268 | 150 | 118 | 0 | 0 | 0 | 118 |
| 19 Desjardins | 4,000 | 0 | 4,000 | 0 | 3,000 | -3,000 | 1,000 |
| 80 National Bank | 6,200 | 13,500 | -7,300 | 18,450 | 9,900 | 8,550 | 1,250 |
| 1 Anonymous | 44,600 | 99,400 | -54,800 | 68,300 | 12,000 | 56,300 | 1,500 |
| 25 Odlum | 2,000 | 0 | 2,000 | 0 | 0 | 0 | 2,000 |
| 70 Manulife | 3,000 | 0 | 3,000 | 0 | 0 | 0 | 3,000 |
| 85 Scotia | 19,905 | 3,400 | 16,505 | 4,900 | 15,400 | -10,500 | 6,005 |
| 9 BMO Nesbitt | 59,200 | 18,400 | 40,800 | 1,000 | 21,900 | -20,900 | 19,900 |
| 7 TD Sec | 75,500 | 30,905 | 44,595 | 28,350 | 23,900 | 4,450 | 49,045 |
| 2 RBC | 76,120 | 13,042 | 63,078 | 17,500 | 570 | 16,930 | 80,008 |