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RA Capital Management: 13F holdings, Q2 2026

Emerging, concentrated · SEC EDGAR filings (CIK 0001346824) · Explore on the interactive board

RA Capital Management disclosed 84 US equity positions worth $11.6bn in its Q2 2026 13F filing (holdings as of June 30, 2026, filed August 14, 2026). Its largest position is ASND at 23.7% of the reported book, followed by PARABILIS MEDICINES INC, RYTM. The top ten holdings are 60.0% of the book, and the portfolio behaves like about 13 equal-weight positions. Versus the prior filing it opened 17 new positions, added to 9, reduced 10 and exited 18.

$11.6bnreported US equity book
84positions
23.7%largest position
60.0%top 10 weight
12.9effective positions (1/HHI)
73quarters on file since Q4 2007

What does RA Capital Management 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: 17 new, 9 added, 10 reduced, 18 exited.

#StockSectorWeightValueSharesΔ sharesAction
1 ASND ASCENDIS PHARMA A/S 23.7%$2.7bn10,281,496 new
2 PARABILIS MEDICINES INC 6.8%$791.9m28,933,371 new
3 RYTM RHYTHM PHARMACEUTICALS INC Healthcare 6.4%$740.2m6,666,837 0% held
4 PCVX VAXCYTE INC Healthcare 5.8%$667.0m11,474,599 0% held
5 SION SIONNA THERAPEUTICS INC 3.8%$435.7m9,905,045 0% held
6 TYRA TYRA BIOSCIENCES INC Healthcare 3.4%$389.6m12,198,625 0% held
7 EWTX EDGEWISE THERAPEUTICS INC 2.9%$341.0m8,392,730 -20% reduced
8 NEWAMSTERDAM PHARMA CO NV 2.8%$323.7m9,550,191 0% held
9 HEMAB THERAPEUTICS HOLDINGS 2.5%$286.8m7,808,627 new
10 SEPN SEPTERNA INC 2.0%$234.3m6,995,858 0% held
11 CLYM CLIMB BIO INC 2.0%$230.1m11,300,939 0% held
12 BCAX BICARA THERAPEUTICS INC 1.9%$215.4m7,255,993 0% held
13 MLYS MINERALYS THERAPEUTICS INC Healthcare 1.8%$207.6m7,692,750 0% held
14 GHRS GH RESEARCH PLC 1.8%$205.3m7,636,813 -1% reduced
15 IRON DISC MEDICINE INC Healthcare 1.5%$179.2m2,450,221 0% held
16 SPYGLASS PHARMA INC 1.5%$178.6m8,021,117 0% held
17 ARTV ARTIVA BIOTHERAPEUTICS INC 1.5%$174.2m17,955,642 82% added
18 JANX JANUX THERAPEUTICS INC Healthcare 1.5%$171.9m11,189,693 0% held
19 TSHA TAYSHA GENE THERAPIES INC Healthcare 1.4%$160.4m23,555,648 0% held
20 BCRX BIOCRYST PHARMACEUTICALS INC Healthcare 1.4%$158.3m15,827,186 0% held
21 WVE WAVE LIFE SCIENCES LTD Healthcare 1.4%$156.7m26,975,505 0% held
22 NUVALENT INC-A 1.3%$153.9m1,246,456 -51% reduced
23 ABVX ABIVAX SA-ADR 1.3%$150.9m1,132,557 new
24 ORKA ORUKA THERAPEUTICS INC Healthcare 1.3%$148.0m1,554,597 new
25 SLDB SOLID BIOSCIENCES INC Healthcare 1.0%$120.2m12,036,126 29% added
26 ZLAB ZAI LAB LTD-ADR Healthcare 0.9%$109.1m5,743,533 1% added
27 SPRY ARS PHARMACEUTICALS INC Healthcare 0.8%$87.0m10,860,977 0% held
28 XNCR XENCOR INC Healthcare 0.7%$84.9m5,274,274 8% added
29 JBIO JADE BIOSCIENCES INC 0.7%$81.6m3,671,083 0% held
30 NTLA INTELLIA THERAPEUTICS INC Healthcare 0.7%$76.6m4,526,926 new
31 LB PHARMACEUTICALS INC 0.6%$71.7m2,208,604 0% held
32 DFTX DEFINIUM THERAPEUTICS INC Healthcare 0.6%$70.6m1,500,000 new
33 ACRS ACLARIS THERAPEUTICS INC Healthcare 0.6%$67.3m12,723,026 87% added
34 4D MOLECULAR THERAPEUTICS IN 0.6%$67.2m5,049,779 0% held
35 SANA SANA BIOTECHNOLOGY INC Healthcare 0.6%$65.4m18,750,000 new
36 DMRA DAMORA THERAPEUTICS INC Healthcare 0.5%$62.4m2,399,702 0% held
37 MNPR MONOPAR THERAPEUTICS INC 0.5%$61.8m667,207 0% held
38 ABOS ACUMEN PHARMACEUTICALS INC 0.5%$56.1m20,992,669 0% held
39 GERN GERON CORP Healthcare 0.5%$54.8m42,809,751 -33% reduced
40 RZLT REZOLUTE INC 0.4%$49.1m9,445,039 3% added
41 EVMN EVOMMUNE INC 0.4%$46.4m3,494,638 0% held
42 VOR VOR BIOPHARMA INC 0.4%$44.2m2,402,095 -56% reduced
43 IPSC CENTURY THERAPEUTICS INC Healthcare 0.4%$43.5m17,754,430 0% held
44 AKTS AKTIS ONCOLOGY INC 0.4%$42.4m1,314,405 -13% reduced
45 BIOA BIOAGE LABS INC 0.4%$41.0m1,671,648 1% added
46 CCCC C4 THERAPEUTICS INC Healthcare 0.3%$37.4m8,000,000 0% held
47 MIRM MIRUM PHARMACEUTICALS INC Healthcare 0.3%$37.3m318,554 0% held
48 CAPR CAPRICOR THERAPEUTICS INC Healthcare 0.3%$36.3m1,507,844 0% held
49 PEPG PEPGEN INC Healthcare 0.3%$36.1m20,064,545 0% held
50 PRLD PRELUDE THERAPEUTICS INC 0.3%$34.5m6,475,882 new

What did RA Capital Management sell? Positions exited since the previous filing

StockPrior weightPrior value
ASND ASCENDIS PHARMA A/S - ADR75.0%$2.4bn
DNTH DIANTHUS THERAPEUTICS INC7.0%$219.2m
PRAX PRAXIS PRECISION MEDICINES I3.8%$120.4m
SRPT SAREPTA THERAPEUTICS INC2.7%$84.9m
SYRE SPYRE THERAPEUTICS INC2.6%$81.8m
FULC FULCRUM THERAPEUTICS INC1.5%$46.4m
OLMA OLEMA PHARMACEUTICALS INC1.2%$38.8m
DSGN DESIGN THERAPEUTICS INC1.0%$31.6m
TVTX TRAVERE THERAPEUTICS INC0.7%$22.2m
GRAL GRAIL INC0.7%$22.1m
RLMD RELMADA THERAPEUTICS INC0.7%$20.5m
STRO SUTRO BIOPHARMA INC0.6%$17.8m
CTNM CONTINEUM THERAPEUTICS INC-A0.5%$16.9m
INSP INSPIRE MEDICAL SYSTEMS INC0.5%$16.8m
HNGE HINGE HEALTH INC-A0.4%$14.1m
WGS GENEDX HOLDINGS CORP0.4%$13.5m
RNA ATRIUM THERAPEUTICS INC0.4%$11.6m
MPLT MAPLIGHT THERAPEUTICS INC0.2%$5.0m

Sector mix

SectorWeight
Healthcare36.7%

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

Filing history

QuarterPositionsEquity value
Q2 202685$11.6bn
Q1 202686$9.5bn
Q4 202572$9.8bn
Q3 202568$8.2bn
Q2 202564$6.0bn
Q1 202586$6.0bn
Q4 202490$7.6bn
Q3 202482$8.8bn
Q2 202479$7.7bn
Q1 202476$7.9bn
Q4 202362$6.4bn
Q3 202366$5.1bn
Q2 202354$5.3bn
Q1 202359$4.4bn
Q4 202270$4.9bn
Q3 202281$4.7bn

Earliest filing: Q4 2007 · 73 quarters on file

How concentrated is RA Capital Management's portfolio?

Across every quarter RA Capital Management has filed, its median largest position is 17.9% of the book and its median top-ten weight is 70.5%, which WhaleCreep classifies as concentrated (the gate is a median largest position of 5%). Of 656 completed holding spells, the median lasted 3.0 quarters; 84 positions are still open and their final length is unknown.