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Tamarack Capital Management, LLC

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13F filer, CIK 1537996, CARLSBAD, CA

Tamarack Capital Management, LLC reported $840,099,000 across 32 holdings for the quarter ended 2015-09-30, in a 13F-HR filed 2015-11-10. Its ten largest share positions make up 74.29% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001095449-15-000149

Period
2015-09-30
Reported value
$840M
Holdings
32
Top 10 weight
74.29%
New
7
Sold out
10

Largest buys vs the previous quarter

SecurityShares changeApprox. value
PATTERSON COS INCadded+370,000$16M
MDTadded+200,000$13.4M
AMGNnew+75,000$10.4M
IMPRIVATA INCadded+400,000$7.11M
CORIUM INTL INCadded+605,615$5.66M

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
BDXreduced-125,000-$16.6M
MDXGexited-1,300,000-$15.1M
CATAMARAN CORPexited-189,802-$11.6M
BRKRexited-500,709-$10.2M
ICUIexited-105,776-$10.1M

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, Q3 2015

Share positions as resolved from 13F-HR 0001095449-15-000149, largest first. % of portfolio is the value over $502,674,000, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
PATTERSON COS INCPATTERSON COS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 1,225,000 shares 1,225,000$53M10.54%+370,000
ENDOLOGIX INCENDOLOGIX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 4,050,000 shares 4,050,000$49.7M9.88%0
MDTMEDTRONIC PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 375,000 shares; 2015Q2: 500,000 shares; 2015Q3: 700,000 shares 700,000$46.9M9.32%+200,000Timeline
DGXQUEST DIAGNOSTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 580,000 shares; 2015Q1: 400,000 shares; 2015Q2: 700,000 shares; 2015Q3: 700,000 shares 700,000$43M8.56%0Timeline
GREATBATCH INCGREATBATCH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 700,000 shares 700,000$39.5M7.86%-23,962
BDXBECTON DICKINSON & COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 40,000 shares; 2014Q4: 165,000 shares; 2015Q1: 229,000 shares; 2015Q2: 400,000 shares; 2015Q3: 275,000 shares 275,000$36.5M7.26%-125,000Timeline
NXSTAGE MEDICAL INCNXSTAGE MEDICAL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 2,000,000 shares 2,000,000$31.5M6.27%+325,000
MDRXVERADIGM INC. COMMON STOCK(DE)Quarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 2,150,000 shares 2,150,000$26.7M5.3%+375,000Timeline
IMPRIVATA INCIMPRIVATA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 1,425,000 shares 1,425,000$25.3M5.04%+400,000
ALKSALKERMES PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 365,000 shares 365,000$21.4M4.26%-35,000Timeline
ATRCATRICURE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 825,000 shares 825,000$18.1M3.6%-60,000Timeline
LUMINEX CORPLUMINEX CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 950,000 shares 950,000$16.1M3.2%-50,000
BIOBIO RAD LABS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 110,000 shares 110,000$14.8M2.94%-11,050Timeline
CORIUM INTL INCCORIUM INTL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 1,325,000 shares 1,325,000$12.4M2.46%+605,615
RTI BIOLOGICS INCRTI BIOLOGICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 1,950,000 shares 1,950,000$11.1M2.2%-50,000
AMARIN CORP PLCAMARIN CORP PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 3,224,690 shares; 2015Q3: 5,700,000 shares 5,700,000$11M2.19%+2,475,310
AMGNAMGEN INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: not reported; 2015Q3: 75,000 shares 75,000$10.4M2.06%newTimeline
SPECTRANETICS CORPSPECTRANETICS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 785,000 shares 785,000$9.26M1.84%-265,000
PRGOPERRIGO CO PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 70,000 shares; 2015Q1: 102,000 shares; 2015Q2: 50,000 shares; 2015Q3: 50,000 shares 50,000$7.86M1.56%0Timeline
OXFORD IMMUNOTEC GLOBAL PLCOXFORD IMMUNOTEC GLOBAL PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: 167,625 shares; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 452,133 shares; 2015Q2: 504,668 shares; 2015Q3: 375,000 shares 375,000$5.06M1.01%-129,668
CERSCERUS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 865,170 shares; 2015Q3: 900,000 shares 900,000$4.09M0.81%+34,830Timeline
LNTHLANTHEUS HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: 1,770,918 shares; 2015Q3: 615,000 shares 615,000$2.65M0.53%-1,155,918Timeline
STREAMLINE HEALTH SOLUTIONSSTREAMLINE HEALTH SOLUTIONSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2015Q3: 1,138,000 shares 1,138,000$2.61M0.52%0
HRTXHERON THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: not reported; 2015Q3: 75,000 shares 75,000$1.83M0.36%newTimeline
NUVASIVE INCNUVASIVE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: not reported; 2015Q3: 25,000 shares 25,000$1.21M0.24%new
GMEDGLOBUS MED INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: not reported; 2015Q2: not reported; 2015Q3: 45,000 shares 45,000$930K0.19%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 SHScall700,000$134M+100,000
TLTISHARES TR 20 YR TR BD ETFcall762,000$94.1Mnew
IWMISHARES TR SHSput600,000$65.5M+100,000
MRKMERCK & CO INC COMcall400,000$19.8Mnew
PRGOPERRIGO CO PLC Stockcall80,000$12.6M+27,000
TEVATEVA PHARMACEUTICAL INDS LTD ADRcall200,000$11.3Mnew

Sold out in Q3 2015

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

SecurityShares beforeValue beforeType
SPYSTATE STR SPDR S&P 500 ETF T400,000$82.3Mput
MDXGMIMEDX GROUP INC1,300,000$15.1Mshares
CATAMARAN CORPCATAMARAN CORP189,802$11.6Mshares
BRKRBRUKER CORP500,709$10.2Mshares
ICUIICU MED INC105,776$10.1Mshares
TECHBIO-TECHNE CORP80,779$7.95Mshares
HMS HLDGS CORPHMS HLDGS CORP329,246$5.65Mshares
INGNINOGEN INC75,000$3.35Mshares
SUPNSUPERNUS PHARMACEUTICALS150,000$2.55Mshares
TDOCTELADOC HEALTH INC10,000$190Kshares

How Q3 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 0001095449-15-000149 base2015-11-10acceptance time not in the bulk data set