Tamarack Advisers, LP
Holding companyRegulatory profile
From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.
Portfolio style
Measured from the filed 13F common-share book for Sep 30, 2023, never from the firm's own description.
Closest benchmark: the S&P 500 as of 2023-09-30, active share 99.6%; sector active share 75.3% against the combined 13F book's sector weights.
Over time 15 measured quarters
How the bands are measured
Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.
Clone Performance
Build a hypothetical price-return history from this filer's public 13F holdings.
View clone backtestPortfolio Concentration
13 tracked positions · as of Sep 30, 2023 · Δ vs Jun 30, 2023Portfolio Trend
Sector Breakdown
As of Sep 30, 2023| Sector | % Portfolio | Value |
|---|---|---|
| Healthcare | 82.6% | $39,680,370 |
| Unclassified | 17.4% | $8,343,900 |
Last Quarter's Activity
Export CSVTrimmed
Positions the filer reduced| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| CERS | Cerus Corp | −1,100,000 | 650,000 | $1,053,000 | |
| VTRS | Viatris Inc | −575,000 | 675,000 | $6,655,500 | |
| — | −495,000 | 435,000 | $5,715,900 | ||
| COLL | Collegium Pharmaceutical, Inc | −190,000 | 185,000 | $4,134,750 | |
| SIBN | SI-BONE, Inc. | −150,000 | 50,000 | $1,062,000 | |
| PHR | Phreesia, Inc. | −75,000 | 215,000 | $4,016,200 | |
| THC | Tenet Healthcare Corp | −75,000 | 20,000 | $1,317,800 | |
| SNY | Sanofi | −65,000 | 30,000 | $1,609,200 | |
| TCMD | Tactile Systems Technology Inc | −60,778 | 239,222 | $3,361,069 | |
| ATRC | AtriCure, Inc. | −45,000 | 40,000 | $1,752,000 | |
| MCK | Mckesson Corp | −3,000 | 11,000 | $4,783,350 | |
| No positions match the current search. | |||||
New Positions
Positions the filer opened this quarterSold Out
Positions the filer fully exited| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| BMRN | Biomarin Pharmaceutical Inc | 75,000 | $6,501,000 | |
| ABT | Abbott Laboratories | 45,000 | $4,905,900 | |
| RDNT | RadNet, Inc. | 140,000 | $4,566,800 | |
| TEVA | Teva Pharmaceutical Industries Ltd | 450,000 | $3,388,500 | |
| ALKS | Alkermes plc. | 100,000 | $3,130,000 | |
| INMD | InMode Ltd. | 75,000 | $2,801,250 | |
| IRWD | Ironwood Pharmaceuticals Inc | 225,000 | $2,394,000 | |
| DXCM | Dexcom Inc | 16,000 | $2,056,160 | |
| RIGL | Rigel Pharmaceuticals Inc | 1,250,000 | $1,612,500 | |
| DCGO | DocGo Inc. | 135,000 | $1,264,950 | |
| SPB | Spectrum Brands Holdings, Inc. | 10,000 | $780,500 | |
| BIO | Bio-Rad Laboratories, Inc. | 2,000 | $758,240 | |
| TECH | BIO-TECHNE Corp | 4,000 | $326,520 | |
| — | 110,000 | $254,100 | ||
| KVUE | Kenvue Inc. | 1,000 | $26,420 | |
| No positions match the current search. | ||||
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
|
CALL
+ SHARES
|
Reduced | 635,000 | $8,343,900 | 17.37% | ||
| VTRS |
Viatris Inc
Healthcare
|
Reduced | 675,000 | $6,655,500 | 13.86% | |
| BDX |
Becton Dickinson & Co
Healthcare
|
Added | 25,000 | $6,463,251 | 13.46% | |
| MCK |
Mckesson Corp
Healthcare
|
Reduced | 11,000 | $4,783,350 | 9.96% | |
| COLL |
Collegium Pharmaceutical, Inc
Healthcare
|
Reduced | 185,000 | $4,134,750 | 8.61% | |
| PHR |
Phreesia, Inc.
Healthcare
|
Reduced | 215,000 | $4,016,200 | 8.36% | |
| ANGO |
Angiodynamics Inc
Healthcare
|
Added | 475,000 | $3,472,250 | 7.23% | |
| TCMD |
Tactile Systems Technology Inc
Healthcare
|
Reduced | 239,222 | $3,361,069 | 7.00% | |
| ATRC |
AtriCure, Inc.
Healthcare
|
Reduced | 40,000 | $1,752,000 | 3.65% | |
| SNY |
Sanofi
Healthcare
|
Reduced | 30,000 | $1,609,200 | 3.35% | |
| THC |
Tenet Healthcare Corp
Healthcare
|
Reduced | 20,000 | $1,317,800 | 2.74% | |
| SIBN |
SI-BONE, Inc.
Healthcare
|
Reduced | 50,000 | $1,062,000 | 2.21% | |
| CERS |
Cerus Corp
Healthcare
|
Reduced | 650,000 | $1,053,000 | 2.19% |
Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.