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Rtw Investments, LP: 13F holdings, Q2 2026

Hedge fund · SEC EDGAR filings (CIK 1493215) · Explore on the interactive board

Rtw Investments, LP disclosed 84 US equity positions worth $11.7bn in its Q2 2026 13F filing (holdings as of June 30, 2026, filed August 14, 2026). Its largest position is MDGL at 9.1% of the reported book, followed by ARGX, PTCT. The top ten holdings are 47.7% of the book, and the portfolio behaves like about 30 equal-weight positions. Versus the prior filing it opened 9 new positions, added to 24, reduced 8 and exited 13. Note: this manager's most recent filing is 3934 quarters behind the newest quarter on file, so these figures are history rather than current positioning.

This manager's most recent filing is 3934 quarter(s) behind the newest quarter on file. Treat these figures as history, not current positioning.
$11.7bnreported US equity book
84positions
9.1%largest position
47.7%top 10 weight
29.65effective positions (1/HHI)
2quarters on file since Q1 2026

What does Rtw Investments, LP own? Top holdings as of June 30, 2026

Change is measured in shares against the previous filing (Q1 2026), so price moves do not read as decisions. This quarter: 9 new, 24 added, 8 reduced, 13 exited.

#StockSectorWeightValueSharesΔ sharesAction
1 MDGL MADRIGAL PHARMACEUTICALS INC Healthcare 9.1%$1.1bn1,993,687 0% held
2 ARGX ARGENX SE Healthcare 5.6%$658.2m709,446 0% held
3 PTCT PTC THERAPEUTICS INC Healthcare 5.4%$631.9m7,746,415 0% held
4 PTGX PROTAGONIST THERAPEUTICS INC Healthcare 5.3%$620.4m5,061,175 0% held
5 CGON CG ONCOLOGY INC Healthcare 5.2%$605.0m8,514,590 22% added
6 INSM INSMED INC Healthcare 4.4%$516.3m4,842,880 0% held
7 TNGX TANGO THERAPEUTICS INC Healthcare 3.7%$434.5m13,900,620 5% added
8 SYRE SPYRE THERAPEUTICS INC Healthcare 3.2%$377.5m4,251,996 2% added
9 CELC CELCUITY INC Healthcare 3.0%$345.8m3,304,903 9% added
10 ERAS ERASCA INC Healthcare 2.8%$328.8m17,946,754 11% added
11 RDNT RADNET INC Healthcare 2.6%$298.9m4,846,958 13% added
12 ORKA ORUKA THERAPEUTICS INC Healthcare 2.6%$298.7m3,139,030 53% added
13 NTRA NATERA INC Healthcare 2.3%$271.4m1,000,000 -20% reduced
14 RARE ULTRAGENYX PHARMACEUTICAL IN Healthcare 2.2%$260.3m7,796,895 114% added
15 IRTC IRHYTHM HOLDINGS INC Healthcare 2.2%$259.6m2,182,631 31% added
16 CYTK CYTOKINETICS INC Healthcare 2.1%$243.8m2,862,003 5% added
17 KAILERA THERAPEUTICS INC 2.0%$237.4m10,776,820 new
18 ESTA ESTABLISHMENT LABS HLDGS INC Healthcare 1.9%$227.9m2,655,695 0% held
19 GH GUARDANT HEALTH INC Healthcare 1.9%$222.2m1,481,033 0% held
20 NBIX NEUROCRINE BIOSCIENCES INC Healthcare 1.8%$213.7m1,267,925 19% added
21 TARS TARSUS PHARMACEUTICALS INC Healthcare 1.8%$211.3m3,357,059 0% held
22 STOK STOKE THERAPEUTICS INC Healthcare 1.6%$184.0m5,623,525 0% held
23 UNIQURE NV 1.5%$181.5m3,941,572 52% added
24 ACAD ACADIA PHARMACEUTICALS INC Healthcare 1.5%$180.8m7,144,524 0% held
25 RGEN REPLIGEN CORP Healthcare 1.4%$169.3m1,240,637 3% added
26 URGN UROGEN PHARMA LTD Healthcare 1.4%$167.2m4,543,895 0% held
27 GHRS GH RESEARCH PLC Healthcare 1.4%$159.5m5,933,815 0% held
28 IMCR IMMUNOCORE HLDGS PLC Healthcare 1.3%$154.6m4,869,798 0% held
29 CMPS COMPASS PATHWAYS PLC Healthcare 1.3%$151.4m10,700,974 1% added
30 IMTX IMMATICS N.V Healthcare 1.1%$131.1m12,946,176 1% added
31 ZLAB ZAI LAB LTD Healthcare 1.1%$124.9m6,574,032 0% held
32 IMVT IMMUNOVANT INC Healthcare 1.0%$122.4m3,177,849 0% held
33 BLTE BELITE BIO INC Healthcare 0.9%$110.2m715,332 0% held
34 XNCR XENCOR INC Healthcare 0.9%$109.1m6,777,461 0% held
35 TSHA TAYSHA GENE THERAPIES INC Healthcare 0.8%$92.3m13,560,258 -1% reduced
36 COGT COGENT BIOSCIENCES INC Healthcare 0.8%$89.4m2,309,021 -58% reduced
37 ALKS ALKERMES PLC Healthcare 0.7%$87.6m1,672,356 0% held
38 GPCR STRUCTURE THERAPEUTICS INC Healthcare 0.7%$86.3m1,607,507 new
39 REPL REPLIMUNE GROUP INC Healthcare 0.7%$82.0m7,411,581 1% added
40 CSTL CASTLE BIOSCIENCES INC Healthcare 0.6%$66.3m2,778,335 1% added
41 CADL CANDEL THERAPEUTICS INC 0.6%$66.1m6,422,018 0% held
42 RCKT ROCKET PHARMACEUTICALS INC Healthcare 0.5%$60.5m17,687,772 0% held
43 KOD KODIAK SCIENCES INC Healthcare 0.5%$58.0m1,487,934 0% held
44 AKTS AKTIS ONCOLOGY INC 0.4%$51.3m1,592,043 0% held
45 AXGN AXOGEN INC Healthcare 0.4%$46.7m1,011,576 new
46 DHR DANAHER CORP DEL Healthcare 0.4%$43.8m230,000 new
47 CGEM CULLINAN THERAPEUTICS INC Healthcare 0.4%$43.1m2,364,347 39% added
48 NGNE NEUROGENE INC 0.4%$42.8m1,362,456 0% held
49 HNGE HINGE HEALTH INC Healthcare 0.4%$41.5m500,000 -74% reduced
50 OBIO ORCHESTRA BIOMED HLDGS INC 0.4%$41.2m9,556,063 15% added

What did Rtw Investments, LP sell? Positions exited since the previous filing

StockPrior weightPrior value
APGE APOGEE THERAPEUTICS INC29.7%$234.2m
APLSUSD APELLIS PHARMACEUTICALS INC18.8%$148.2m
ISRG INTUITIVE SURGICAL INC12.9%$101.4m
CNTA CENTESSA PHARMACEUTICALS PLC10.4%$81.6m
CRNXGBP CRINETICS PHARMACEUTICALS IN6.7%$52.7m
WAY WAYSTAR HLDG CORP5.0%$39.3m
ARWR ARROWHEAD PHARMACEUTICALS IN4.7%$36.7m
SYK STRYKER CORPORATION4.2%$32.9m
CMPX COMPASS THERAPEUTICS INC2.8%$22.1m
FLGT FULGENT GENETICS INC2.6%$20.5m
JBIO JADE BIOSCIENCES INC1.0%$8.1m
IVA INVENTIVA SA0.9%$7.2m
OMDA OMADA HEALTH INC0.3%$2.5m

Sector mix

SectorWeight
Healthcare93.7%

Sectors cover positions whose ticker resolved to a sector; the remainder is unclassified, not cash.

Filing history

QuarterPositionsEquity value
Q2 202684$11.7bn
Q1 202688$10.0bn

How concentrated is Rtw Investments, LP's portfolio?

Across every quarter Rtw Investments, LP has filed, its median largest position is 9.8% of the book and its median top-ten weight is 48.9%, which WhaleCreep classifies as concentrated (the gate is a median largest position of 5%). Of 13.0 completed holding spells, the median lasted 1.0 quarters; 84.0 positions are still open and their final length is unknown.