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Tamarack Capital Management, LLC

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13F filer, CIK 1537996, CARLSBAD, CA

Tamarack Capital Management, LLC reported $869,740,000 across 35 holdings for the quarter ended 2015-06-30, in a 13F-HR filed 2015-08-11. Its ten largest share positions make up 65.13% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001095449-15-000109

Period
2015-06-30
Reported value
$870M
Holdings
35
Top 10 weight
65.13%
New
8
Sold out
12

Largest buys vs the previous quarter

SecurityShares changeApprox. value
PATTERSON COS INCadded+537,055$26.1M
BDXadded+171,000$24.2M
DGXadded+300,000$21.8M
LNTHnew+1,770,918$11M
ALKSadded+160,000$10.3M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
TEVAexited-400,000-$24.9M
INGNreduced-475,000-$21.2M
DXCMexited-225,000-$14M
PFEexited-391,198-$13.6M
KERYX BIOPHARMACEUTICALSexited-950,000-$12.1M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q2 2015

Share positions as resolved from 13F-HR 0001095449-15-000109, largest first. % of portfolio is the value over $591,663,000, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
ENDOLOGIX INCENDOLOGIX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 1,425,000 shares; 2014Q2: 2,375,000 shares; 2014Q3: 3,300,000 shares; 2014Q4: 3,960,000 shares; 2015Q1: 4,000,000 shares; 2015Q2: 4,050,000 shares 4,050,000$62.1M10.5%+50,000
BDXBECTON DICKINSON & COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 40,000 shares; 2014Q4: 165,000 shares; 2015Q1: 229,000 shares; 2015Q2: 400,000 shares 400,000$56.7M9.58%+171,000Timeline
DGXQUEST DIAGNOSTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 580,000 shares; 2015Q1: 400,000 shares; 2015Q2: 700,000 shares 700,000$50.8M8.58%+300,000Timeline
PATTERSON COS INCPATTERSON COS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 225,000 shares; 2014Q3: 370,000 shares; 2014Q4: 300,000 shares; 2015Q1: 317,945 shares; 2015Q2: 855,000 shares 855,000$41.6M7.03%+537,055
GREATBATCH INCGREATBATCH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 350,000 shares; 2014Q2: 369,900 shares; 2014Q3: 474,730 shares; 2014Q4: 519,000 shares; 2015Q1: 573,931 shares; 2015Q2: 723,962 shares 723,962$39M6.6%+150,031
MDTMEDTRONIC PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 375,000 shares; 2015Q2: 500,000 shares 500,000$37M6.26%+125,000Timeline
ALKSALKERMES PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 475,000 shares; 2014Q2: 525,000 shares; 2014Q3: 450,000 shares; 2014Q4: 300,000 shares; 2015Q1: 240,000 shares; 2015Q2: 400,000 shares 400,000$25.7M4.35%+160,000Timeline
MDRXVERADIGM INC. COMMON STOCK(DE)Quarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 1,250,000 shares; 2015Q1: 1,500,000 shares; 2015Q2: 1,775,000 shares 1,775,000$24.3M4.1%+275,000Timeline
SPECTRANETICS CORPSPECTRANETICS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 525,000 shares; 2014Q2: 1,150,000 shares; 2014Q3: 1,150,000 shares; 2014Q4: 1,025,000 shares; 2015Q1: 1,077,596 shares; 2015Q2: 1,050,000 shares 1,050,000$24.2M4.08%-27,596
NXSTAGE MEDICAL INCNXSTAGE MEDICAL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 1,200,000 shares; 2014Q2: 1,050,000 shares; 2014Q3: 1,100,000 shares; 2014Q4: 1,100,000 shares; 2015Q1: 1,300,000 shares; 2015Q2: 1,675,000 shares 1,675,000$23.9M4.04%+375,000
ATRCATRICURE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 422,292 shares; 2014Q2: 586,555 shares; 2014Q3: 700,000 shares; 2014Q4: 685,000 shares; 2015Q1: 800,000 shares; 2015Q2: 885,000 shares 885,000$21.8M3.69%+85,000Timeline
BIOBIO RAD LABS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 16,369 shares; 2014Q3: 83,378 shares; 2014Q4: 105,000 shares; 2015Q1: 108,000 shares; 2015Q2: 121,050 shares 121,050$18.2M3.08%+13,050Timeline
LUMINEX CORPLUMINEX CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 300,000 shares; 2014Q2: 500,000 shares; 2014Q3: 550,000 shares; 2014Q4: 500,000 shares; 2015Q1: 633,092 shares; 2015Q2: 1,000,000 shares 1,000,000$17.3M2.92%+366,908
IMPRIVATA INCIMPRIVATA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 195,553 shares; 2014Q3: 300,000 shares; 2014Q4: 377,924 shares; 2015Q1: 429,261 shares; 2015Q2: 1,025,000 shares 1,025,000$16.8M2.83%+595,739
MDXGMIMEDX GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 1,800,000 shares; 2014Q2: 1,775,000 shares; 2014Q3: 2,000,000 shares; 2014Q4: 650,000 shares; 2015Q1: 1,000,000 shares; 2015Q2: 1,300,000 shares 1,300,000$15.1M2.55%+300,000Timeline
RTI BIOLOGICS INCRTI BIOLOGICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 2,000,000 shares; 2014Q2: 2,150,000 shares; 2014Q3: 2,200,000 shares; 2014Q4: 2,017,241 shares; 2015Q1: 2,000,000 shares; 2015Q2: 2,000,000 shares 2,000,000$12.9M2.18%0
CATAMARAN CORPCATAMARAN CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 325,000 shares; 2014Q2: 300,000 shares; 2014Q3: not reported; 2014Q4: 200,000 shares; 2015Q1: 250,000 shares; 2015Q2: 189,802 shares 189,802$11.6M1.96%-60,198
LNTHLANTHEUS HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 1,770,918 shares 1,770,918$11M1.85%newTimeline
BRKRBRUKER CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 500,709 shares 500,709$10.2M1.73%newTimeline
ICUIICU MED INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 80,125 shares; 2014Q4: 13,875 shares; 2015Q1: 35,000 shares; 2015Q2: 105,776 shares 105,776$10.1M1.71%+70,776Timeline
CORIUM INTL INCCORIUM INTL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 627,670 shares; 2014Q3: 667,579 shares; 2014Q4: 750,100 shares; 2015Q1: 778,921 shares; 2015Q2: 719,385 shares 719,385$9.85M1.66%-59,536
PRGOPERRIGO CO PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 70,000 shares; 2015Q1: 102,000 shares; 2015Q2: 50,000 shares 50,000$9.24M1.56%-52,000Timeline
TECHBIO-TECHNE CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 40,000 shares; 2015Q1: 115,000 shares; 2015Q2: 80,779 shares 80,779$7.95M1.34%-34,221Timeline
AMARIN CORP PLCAMARIN CORP PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 3,224,690 shares 3,224,690$7.93M1.34%new
OXFORD IMMUNOTEC GLOBAL PLCOXFORD IMMUNOTEC GLOBAL PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 167,625 shares; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 452,133 shares; 2015Q2: 504,668 shares 504,668$6.99M1.18%+52,535
HMS HLDGS CORPHMS HLDGS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 329,246 shares 329,246$5.65M0.96%new
CERSCERUS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 865,170 shares 865,170$4.49M0.76%newTimeline
INGNINOGEN INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 260,617 shares; 2014Q4: 674,000 shares; 2015Q1: 550,000 shares; 2015Q2: 75,000 shares 75,000$3.35M0.57%-475,000Timeline
STREAMLINE HEALTH SOLUTIONSSTREAMLINE HEALTH SOLUTIONSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 875,000 shares; 2014Q2: 1,025,000 shares; 2014Q3: 1,138,000 shares; 2014Q4: 1,138,000 shares; 2015Q1: 1,138,000 shares; 2015Q2: 1,138,000 shares 1,138,000$3.19M0.54%0
SUPNSUPERNUS PHARMACEUTICALSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 150,000 shares 150,000$2.55M0.43%newTimeline
TDOCTELADOC HEALTH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 10,000 shares 10,000$190K0.03%newTimeline

Options

Puts and calls, as filed. The amount and value describe the underlying shares, not the option premium, so they stay out of % of portfolio (H5).

SecurityTypeAmountValueChange
SPYSTATE STR SPDR S&P 500 ETF T SHScall600,000$124M+200,000
SPYSTATE STR SPDR S&P 500 ETF T SHSput400,000$82.3M0
IWMISHARES TR SHSput500,000$62.4M+100,000
PRGOPERRIGO CO PLC Stockcall53,000$9.8Mnew

Sold out in Q2 2015

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
TEVATEVA PHARMACEUTICAL INDS LTD400,000$24.9Mshares
DXCMDEXCOM INC225,000$14Mshares
PFEPFIZER INC391,198$13.6Mshares
KERYX BIOPHARMACEUTICALSKERYX BIOPHARMACEUTICALS950,000$12.1Mshares
OREXIGEN THERAPEUTICS INCOREXIGEN THERAPEUTICS INC1,000,000$7.83Mshares
TMOTHERMO FISHER SCIENTIFIC INC50,000$6.72Mshares
MDXGMIMEDX GROUP INC500,000$5.2Mcall
RMDRESMED INC60,000$4.31Mput
FEI COFEI CO35,180$2.69Mshares
HANGER INCHANGER INC100,000$2.27Mshares
STERIS CORPSTERIS CORP10,000$703Kshares
DISCOVERY LABORATORIES INC NDISCOVERY LABORATORIES INC N235,542$280Kshares

How Q2 2015 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001095449-15-000109 base2015-08-11acceptance time not in the bulk data set