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Institutional Investment Manager
RTW INVESTMENTS, LP
RTW INVESTMENTS, LP (CIK: 0001493215) incorporated in Delaware, located at 40 10th Avenue, New York, NY. Institutional holdings reported to the SEC.

Institutional Holdings (2015Q3)
Portfolio Summary: 44 holdings with a total value of $321,849,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 ALNYLAM PHARMACEUTICALS INC 533,660 42,885,000 13.32%
2 INCYTE 303,212 33,453,000 10.39%
3 LA JOLLA PHARMACEUTICAL CO 1,080,331 30,022,000 9.33%
4 BIOCRYST PHARMACEUTICALS 2,228,206 25,402,000 7.89%
5 KITE PHARMA INCORPORATED 375,476 20,907,000 6.50%
6 ACHILLION PHARMACEUTICALS INC COM 2,589,818 17,896,000 5.56%
7 MIRATI THERAPEUTICS INC COM 482,069 16,593,000 5.16%
8 Dicerna Pharmaceuticals 2,005,238 16,463,000 5.12%
9 BLUEBIRD BIO INCORPORATED 151,594 12,969,000 4.03%
10 ARROWHEAD RESH CORP COM NEW 2,097,185 12,080,000 3.75%
11 FIVE PRIME THERAPEUTICS INC 713,954 10,988,000 3.41%
12 AGENUS INC 2,084,142 9,587,000 2.98%
13 Atara Biotherapeutics Inc. 262,995 8,269,000 2.57%
14 CELLDEX THERAPEUTICS INC NEW 718,729 7,575,000 2.35%
15 SYMMETRY SURGICAL INC 807,442 7,186,000 2.23%
16 BRISTOL MYERS SQUIBB CO 102,425 6,064,000 1.88%
17 CORIUM INTERNATIONAL INC 575,212 5,378,000 1.67%
18 OMEROS CORP 490,000 5,370,000 1.67%
19 REGENXBIO INC COM 204,494 4,505,000 1.40%
20 GLOBAL BLOOD THERAPEUTICS IN COM 92,399 3,896,000 1.21%
21 BRISTOL MYERS SQUIBB CO 7,500 2,588,000 0.80% Call
22 LIPOCINE INC NEW 212,497 2,514,000 0.78%
23 INVUITY INC 175,000 2,454,000 0.76%
24 DYAX CORP COM CVR 115,358 2,202,000 0.68%
25 Presbia, PLC (Ireland) 350,000 1,918,000 0.60%
26 Catalyst Biosciences 380,806 1,775,000 0.55%
27 REPROS THERAPEUTICS INC 232,830 1,730,000 0.54%
28 VBI Vaccines Inc. 650,000 1,716,000 0.53%
29 ORASURE TECHNOLOGIES INC 322,996 1,434,000 0.45%
30 CYTRX CORP 453,465 1,075,000 0.33%
31 NEWLINK GENETICS CORP 28,291 1,014,000 0.32%
32 MASIMO CORP COM 25,900 999,000 0.31%
33 ALLSCRIPTS HEALTHCARE 48,000 595,000 0.18%
34 BIOCRYST PHARMACEUTICALS 2,000 431,000 0.13% Call
35 Nivalis Therapeutics Inc 30,000 389,000 0.12%
36 BIOPHARMX CORP COM 370,636 382,000 0.12%
37 NATERA INC 31,693 344,000 0.11%
38 GENOMIC HEALTH INC COM 15,000 317,000 0.10%
39 ENDOLOGIX INC 15,000 184,000 0.06%
40 VERACYTE INC 25,000 117,000 0.04%
41 ADAPTIMMUNE THERAPEUTICS PLC 7,028 84,000 0.03%
42 MERIDIAN BIOSCIENCE INC COM 1,252 50,000 0.02% Call
43 UNITED STATES 13,850 42,000 0.01% Call
44 BERKSHIRE HATHAWAY INC DE CL B NEW 50 7,000 0.00%

Portfolio data is normalized using SEC Form 13F filings, including the Restatement filing (0001493152-16-010243, filed 2016.05.24).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.