Institutional Manager · CIK 0001791827
Avidity Partners Management LP
DALLAS, TX · File #028-20028
Latest AUM
$346.7M
Positions
39
Top-10 Concentration
71.9%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| REDUCE | DIANTHUS THERAPEUTICS INC | DNTH | -1,100,000 | -$45.3M | +$6.0M |
| REDUCE | NATERA INC | NTRA | -58,600 | -$13.4M | +$4.8M |
| EXITED | BRISTOL-MYERS SQUIBB CO | 110122108 | -257,600 | -$11.6M | $0 |
| REDUCE | DANAHER CORPORATION | 235851102 | -37,700 | -$8.6M | +$1.7M |
| NEW | ALNYLAM PHARMACEUTICALS INC | ALNY | +21,000 | +$8.4M | $0 |
| REDUCE | MEDTRONIC PLC | MDT | -83,000 | -$8.0M | +$156,292 |
| EXITED | METSERA INC | 59267L107 | -140,500 | -$7.4M | $0 |
| REDUCE | THERMO FISHER SCIENTIFIC INC | TMO | -12,200 | -$7.1M | +$1.8M |
| EXITED | UNITEDHEALTH GROUP INC | 91324P102 | -17,800 | -$6.1M | $0 |
| NEW | ICON PLC | ICLR | +33,100 | +$6.0M | $0 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 202539 pos · $346.7M
- 13F HOLDINGS REPORTQ/E Sep 202543 pos · $439.4M
- 13F HOLDINGS REPORTQ/E Jun 202556 pos · $502.0M
- 13F HOLDINGS REPORTQ/E Mar 202567 pos · $524.7M
- 13F HOLDINGS REPORTQ/E Dec 202463 pos · $1.02B
- 13F HOLDINGS REPORTQ/E Sep 202481 pos · $1.96B
- 13F HOLDINGS REPORTQ/E Jun 202485 pos · $2.35B
- 13F HOLDINGS REPORTQ/E Mar 202490 pos · $3.10B
- 13F HOLDINGS REPORTQ/E Dec 202383 pos · $2.48B
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | DIANTHUS THERAPEUTICS INC | DNTH | 2,104,184 | $86.7M | 25.01% |
| 2 | CG ONCOLOGY INC | CGON | 1,472,699 | $61.1M | 17.64% |
| 3 | JADE BIOSCIENCES INC | JBIO | 1,400,708 | $21.6M | 6.23% |
| 4 | ORUKA THERAPEUTICS INC | ORKA | 660,424 | $20.0M | 5.77% |
| 5 | TEVA PHARMACEUTICAL INDS LTD | 881624209 | 417,300 | $13.0M | 3.76% |
| 6 | BOSTON SCIENTIFIC CORP | BSX | 114,500 | $10.9M | 3.15% |
| 7 | MEDTRONIC PLC | MDT | 107,600 | $10.3M | 2.98% |
| 8 | PERSPECTIVE THERAPEUTICS INC | CATX | 3,210,733 | $8.8M | 2.55% |
| 9 | ALNYLAM PHARMACEUTICALS INC | ALNY | 21,000 | $8.4M | 2.41% |
| 10 | REPLIGEN CORP | RGEN | 50,300 | $8.2M | 2.38% |
| 11 | CONTEXT THERAPEUTICS INC | CNTX | 5,504,855 | $8.1M | 2.33% |
| 12 | MCKESSON CORP | MCK | 9,520 | $7.8M | 2.25% |
| 13 | ICON PLC | ICLR | 33,100 | $6.0M | 1.74% |
| 14 | AGILENT TECHNOLOGIES INC | A | 41,500 | $5.6M | 1.63% |
| 15 | PFIZER INC | PFE | 203,600 | $5.1M | 1.46% |
| 16 | CENTENE CORP DEL | CNC | 119,400 | $4.9M | 1.42% |
| 17 | KENVUE INC | KVUE | 232,800 | $4.0M | 1.16% |
| 18 | DANAHER CORPORATION | 235851102 | 17,000 | $3.9M | 1.12% |
| 19 | THERMO FISHER SCIENTIFIC INC | TMO | 6,700 | $3.9M | 1.12% |
| 20 | NOVO-NORDISK A S | NONOF | 67,300 | $3.4M | 0.99% |