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Tamarack Capital Management, LLC

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13F filer, CIK 1537996, CARLSBAD, CA

Tamarack Capital Management, LLC reported $758,993,000 across 39 holdings for the quarter ended 2015-03-31, in a 13F-HR filed 2015-05-11. Its ten largest share positions make up 58.88% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001095449-15-000068

Period
2015-03-31
Reported value
$759M
Holdings
39
Top 10 weight
58.88%
New
11
Sold out
11

Largest buys vs the previous quarter

SecurityShares changeApprox. value
MDTnew+375,000$29.2M
PFEnew+391,198$13.6M
KERYX BIOPHARMACEUTICALSnew+950,000$12.1M
BDXadded+64,000$9.19M
OREXIGEN THERAPEUTICS INCnew+1,000,000$7.83M

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
MEDTRONIC INCexited-325,000-$23.5M
DGXreduced-180,000-$13.8M
MYGNexited-300,000-$10.2M
NATUS MEDICAL INCexited-223,236-$8.04M
HANGER INCreduced-354,501-$8.04M

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, Q1 2015

Share positions as resolved from 13F-HR 0001095449-15-000068, largest first. % of portfolio is the value over $534,596,000, 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; 2013Q2: restricted; 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 4,000,000$68.3M12.77%+40,000
SPECTRANETICS CORPSPECTRANETICS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 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 1,077,596$37.5M7.01%+52,596
GREATBATCH INCGREATBATCH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 350,000 shares; 2014Q2: 369,900 shares; 2014Q3: 474,730 shares; 2014Q4: 519,000 shares; 2015Q1: 573,931 shares 573,931$33.2M6.21%+54,931
BDXBECTON DICKINSON & COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 40,000 shares; 2014Q4: 165,000 shares; 2015Q1: 229,000 shares 229,000$32.9M6.15%+64,000Timeline
DGXQUEST DIAGNOSTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 580,000 shares; 2015Q1: 400,000 shares 400,000$30.7M5.75%-180,000Timeline
MDTMEDTRONIC PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 375,000 shares 375,000$29.2M5.47%newTimeline
TEVATEVA PHARMACEUTICAL INDS LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 246,500 shares; 2014Q3: 230,000 shares; 2014Q4: 385,000 shares; 2015Q1: 400,000 shares 400,000$24.9M4.66%+15,000Timeline
NXSTAGE MEDICAL INCNXSTAGE MEDICAL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 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 1,300,000$22.5M4.21%+200,000
MDRXVERADIGM INC. COMMON STOCK(DE)Quarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 1,250,000 shares; 2015Q1: 1,500,000 shares 1,500,000$17.9M3.36%+250,000Timeline
INGNINOGEN INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 260,617 shares; 2014Q4: 674,000 shares; 2015Q1: 550,000 shares 550,000$17.6M3.29%-124,000Timeline
PRGOPERRIGO CO PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 70,000 shares; 2015Q1: 102,000 shares 102,000$16.9M3.16%+32,000Timeline
ATRCATRICURE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 422,292 shares; 2014Q2: 586,555 shares; 2014Q3: 700,000 shares; 2014Q4: 685,000 shares; 2015Q1: 800,000 shares 800,000$16.4M3.07%+115,000Timeline
PATTERSON COS INCPATTERSON COS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 225,000 shares; 2014Q3: 370,000 shares; 2014Q4: 300,000 shares; 2015Q1: 317,945 shares 317,945$15.5M2.9%+17,945
CATAMARAN CORPCATAMARAN CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 325,000 shares; 2014Q2: 300,000 shares; 2014Q3: not reported; 2014Q4: 200,000 shares; 2015Q1: 250,000 shares 250,000$14.9M2.78%+50,000
ALKSALKERMES PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 475,000 shares; 2014Q2: 525,000 shares; 2014Q3: 450,000 shares; 2014Q4: 300,000 shares; 2015Q1: 240,000 shares 240,000$14.6M2.74%-60,000Timeline
BIOBIO RAD LABS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 16,369 shares; 2014Q3: 83,378 shares; 2014Q4: 105,000 shares; 2015Q1: 108,000 shares 108,000$14.6M2.73%+3,000Timeline
DXCMDEXCOM INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 105,000 shares; 2014Q4: 340,000 shares; 2015Q1: 225,000 shares 225,000$14M2.62%-115,000Timeline
PFEPFIZER INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 391,198 shares 391,198$13.6M2.55%newTimeline
KERYX BIOPHARMACEUTICALSKERYX BIOPHARMACEUTICALSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 950,000 shares 950,000$12.1M2.26%new
TECHBIO-TECHNE CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: 40,000 shares; 2015Q1: 115,000 shares 115,000$11.5M2.16%+75,000Timeline
MDXGMIMEDX GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 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 1,000,000$10.4M1.95%+350,000Timeline
LUMINEX CORPLUMINEX CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 300,000 shares; 2014Q2: 500,000 shares; 2014Q3: 550,000 shares; 2014Q4: 500,000 shares; 2015Q1: 633,092 shares 633,092$10.1M1.89%+133,092
RTI BIOLOGICS INCRTI BIOLOGICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 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 2,000,000$9.88M1.85%-17,241
OREXIGEN THERAPEUTICS INCOREXIGEN THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 1,000,000 shares 1,000,000$7.83M1.46%new
TMOTHERMO FISHER SCIENTIFIC INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 50,000 shares 50,000$6.72M1.26%newTimeline
OXFORD IMMUNOTEC GLOBAL PLCOXFORD IMMUNOTEC GLOBAL PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 167,625 shares; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 452,133 shares 452,133$6.37M1.19%new
IMPRIVATA INCIMPRIVATA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 195,553 shares; 2014Q3: 300,000 shares; 2014Q4: 377,924 shares; 2015Q1: 429,261 shares 429,261$6.01M1.12%+51,337
CORIUM INTL INCCORIUM INTL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: 627,670 shares; 2014Q3: 667,579 shares; 2014Q4: 750,100 shares; 2015Q1: 778,921 shares 778,921$5.1M0.95%+28,821
STREAMLINE HEALTH SOLUTIONSSTREAMLINE HEALTH SOLUTIONSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 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 1,138,000$4.04M0.76%0
ICUIICU MED INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 80,125 shares; 2014Q4: 13,875 shares; 2015Q1: 35,000 shares 35,000$3.26M0.61%+21,125Timeline
FEI COFEI COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 35,180 shares 35,180$2.69M0.5%new
HANGER INCHANGER INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: 200,000 shares; 2014Q4: 454,501 shares; 2015Q1: 100,000 shares 100,000$2.27M0.42%-354,501
STERIS CORPSTERIS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: not reported; 2014Q2: not reported; 2014Q3: not reported; 2014Q4: not reported; 2015Q1: 10,000 shares 10,000$703K0.13%new
DISCOVERY LABORATORIES INC NDISCOVERY LABORATORIES INC NQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2013Q2: restricted; 2013Q3: restricted; 2013Q4: restricted; 2014Q1: 1,000,000 shares; 2014Q2: 1,500,000 shares; 2014Q3: 1,500,000 shares; 2014Q4: 1,500,000 shares; 2015Q1: 235,542 shares 235,542$280K0.05%-1,264,458

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 SHSput400,000$82.6M-200,000
SPYSTATE STR SPDR S&P 500 ETF T SHScall400,000$82.6Mnew
IWMISHARES TR SHSput400,000$49.7Mnew
MDXGMIMEDX GROUP INC COMcall500,000$5.2M-75,300
RMDRESMED INC Stockput60,000$4.31Mnew

Sold out in Q1 2015

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

SecurityShares beforeValue beforeType
IWMISHARES TR250,000$29.9Mcall
MEDTRONIC INCMEDTRONIC INC325,000$23.5Mshares
PFEPFIZER INC450,000$14Mcall
PMPHILIP MORRIS INTL INC150,000$12.2Mput
MYGNMYRIAD GENETICS INC300,000$10.2Mshares
NATUS MEDICAL INCNATUS MEDICAL INC223,236$8.04Mshares
CAREFUSION CORPCAREFUSION CORP78,500$4.66Mshares
BSXBOSTON SCIENTIFIC CORP275,000$3.64Mput
TRINITY BIOTECH PLCTRINITY BIOTECH PLC125,000$2.19Mshares
LABSTANDARD BIOTOOLS INC24,442$824Kshares
INTERSECT ENT INCINTERSECT ENT INC18,149$337Kshares

How Q1 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 0001095449-15-000068 base2015-05-11acceptance time not in the bulk data set