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Avidity Partners Management LP David Witzke

Dallas, TX 21 processed 13Fs on this site, 2021 Q3 to 2026 Q2

  • $624M
  • 45 holdings
  • 2026 Q2
  • +41.2% QoQ
  • Top 5 70.9%

Portfolio

2026 Q2, filed 8/14/2026, top 12 of 45 holdings

Top 5 70.9%, top 10 81.9%

  1. DNTH, Dianthus Therapeutics 32.8%
  2. CGON, CG Oncology 15.9%
  3. ORKA, Oruka Therapeutics 11.6%
  4. JBIO, Jade Biosciences 6.1%
  5. ELVN, Enliven Therapeutics 4.5%
  6. CATX, Perspective Therapeutics 3.4%
  7. AKTS, Aktis Oncology 2.5%
  8. PVLA 1.7%
  9. MOBI, Mobia Medical 1.7%
  10. RGEN, Repligen 1.7%
  11. Immunic 1.6%
  12. Senseonics 1.5%
  13. Other 15.0%

AUM over time

2026 Q2 $624M +41.2% QoQ
2021 Q3: $4.5B 2021 Q3: $4.5B
Q3 2021
2021 Q4: $4.7B, +4.5% QoQ 2021 Q4: $4.7B, +4.5% QoQ
Q4
2022 Q1: $4.8B, +1.9% QoQ 2022 Q1: $4.8B, +1.9% QoQ
Q1 2022
2022 Q2: $4.4B, −9.3% QoQ 2022 Q2: $4.4B, −9.3% QoQ
Q2
2022 Q3: $4.9B, +12.9% QoQ 2022 Q3: $4.9B, +12.9% QoQ
Q3
2022 Q4: $4.6B, −6.2% QoQ 2022 Q4: $4.6B, −6.2% QoQ
Q4
2023 Q1: $3B, −34.7% QoQ 2023 Q1: $3B, −34.7% QoQ
Q1 2023
2023 Q2: $2.9B, −5.0% QoQ 2023 Q2: $2.9B, −5.0% QoQ
Q2
2023 Q3: $2.5B, −13.3% QoQ 2023 Q3: $2.5B, −13.3% QoQ
Q3
2023 Q4: $2.7B, +10.5% QoQ 2023 Q4: $2.7B, +10.5% QoQ
Q4
2024 Q1: $3.1B, +13.0% QoQ 2024 Q1: $3.1B, +13.0% QoQ
Q1 2024
2024 Q2: $2.4B, −24.1% QoQ 2024 Q2: $2.4B, −24.1% QoQ
Q2
2024 Q3: $2B, −16.7% QoQ 2024 Q3: $2B, −16.7% QoQ
Q3
2024 Q4: $1B, −48.1% QoQ 2024 Q4: $1B, −48.1% QoQ
Q4
2025 Q1: $525M, −48.4% QoQ 2025 Q1: $525M, −48.4% QoQ
Q1 2025
2025 Q2: $502M, −4.4% QoQ 2025 Q2: $502M, −4.4% QoQ
Q2
2025 Q3: $439M, −12.5% QoQ 2025 Q3: $439M, −12.5% QoQ
Q3
2025 Q4: $347M, −21.0% QoQ 2025 Q4: $347M, −21.0% QoQ
Q4
2026 Q1: $442M, +27.4% QoQ 2026 Q1: $442M, +27.4% QoQ
Q1 2026
2026 Q2: $624M, +41.2% QoQ 2026 Q2: $624M, +41.2% QoQ
Q2

Book

2024 Q4 2024 Q3, filed 14 Feb, long equity only

Download CSV Download Excel All activity
DNTH, Dianthus Therapeutics 6.15% Reduce −1.5% 2,873,000 $21.80 $63M −44,231 −$17M
BSX, Boston Scientific 4.52% Reduce −46.5% 515,000 $89.32 $46M −447,000 −$35M
Janux Therapeutics 3.90%, was 1.30% Add +32.0% 741,900 $53.54 $40M +179,900 +$14M
NTRA, Natera 3.48%, was 3.60% Reduce −59.8% 223,800 $158.30 $35M −332,600 −$35M
Exact Sciences 3.33%, was 2.04% Add +2.6% 603,011 $56.19 $34M +15,011 −$6.2M
ISRG, Intuitive Surgical 3.32%, was 3.71% Reduce −56.3% 64,800 $521.96 $34M −83,400 −$39M
CGON, CG Oncology 3.09%, was 3.19% Reduce −33.7% 1,097,800 $28.68 $31M −558,200 −$31M
UNH, UnitedHealth Group 2.98% Reduce −31.4% 60,000 $505.86 $30M −27,400 −$21M
NBIX, Neurocrine Biosciences 2.95% Reduce −52.1% 220,400 $136.50 $30M −239,600 −$23M
IDYA, Ideaya Biosciences 2.84% Reduce −17.9% 1,126,700 $25.70 $29M −246,300 −$15M
JAZZ, Jazz Pharmaceuticals 2.84% Reduce −45.6% 234,500 $123.15 $29M −196,500 −$19M
MIRM, Mirum Pharmaceuticals 2.71% Reduce −8.9% 666,200 $41.35 $28M −64,904 −$966K
ACHC 2.56%, was 3.19% Reduce −33.2% 658,000 $39.65 $26M −327,000 −$36M
ARVN, Arvinas 2.56% Reduce −9.3% 1,358,000 $19.17 $26M −139,000 −$11M
GKOS, Glaukos 2.50% Reduce −50.7% 170,000 $149.94 $25M −174,900 −$19M
DXCM, DexCom 2.43%, was 0.82% Add +32.5% 318,000 $77.77 $25M +78,000 +$8.6M
TMO, Thermo Fisher Scientific 2.28% Reduce −35.0% 44,600 $520.23 $23M −24,000 −$19M
HUM, Humana 2.22% Reduce −31.2% 89,200 $253.71 $23M −40,500 −$18M
KYMR, Kymera Therapeutics 1.98% Hold 500,000 $40.23 $20M — —
AVTR, Avantor 1.96% Reduce −23.3% 947,000 $21.07 $20M −288,000 −$12M
SNDX, Syndax Pharmaceuticals 1.95%, was 2.41% Reduce −38.9% 1,500,000 $13.22 $20M −955,000 −$27M
CNTA, Centessa Pharmaceuticals 1.92% Reduce −45.3% 1,165,800 $16.75 $20M −966,200 −$15M
RVMD, Revolution Medicines 1.92% Reduce −43.5% 446,200 $43.74 $20M −343,800 −$16M
XENE, Xenon Pharmaceuticals 1.82% Reduce −42.1% 474,000 $39.20 $19M −344,000 −$14M
THC, Tenet Healthcare 1.70%, was 2.14% Reduce −45.8% 137,000 $126.23 $17M −116,000 −$25M
INSM, Insmed 1.58%, was 2.20% Reduce −60.7% 232,800 $69.04 $16M −359,200 −$27M
AXSM, Axsome Therapeutics 1.56% Reduce −36.5% 188,000 $84.61 $16M −108,100 −$11M
Blueprint Medicines 1.51% Reduce −43.9% 176,600 $87.22 $15M −138,400 −$14M
DHR, Danaher 1.51% Reduce −29.5% 67,000 $229.55 $15M −28,000 −$11M
RARE 1.45%, was 2.13% Reduce −53.2% 352,000 $42.07 $15M −400,000 −$27M
ILMN, Illumina 1.44%, was 1.94% Reduce −62.4% 109,700 $133.63 $15M −182,300 −$23M
ABBV, AbbVie 1.41% Reduce −19.3% 80,700 $177.70 $14M −19,300 −$5.4M
RCKT, Rocket Pharmaceuticals 1.30%, was 0.71% Add +40.6% 1,053,300 $12.57 $13M +304,300 −$594K
BMY, Bristol Myers Squibb 1.19% Reduce −18.3% 215,000 $56.56 $12M −48,000 −$1.4M
TMDX, Transmedics Group 1.18%, was 0.22% Add +597.1% 192,400 $62.35 $12M +164,800 +$7.7M
PHAT, Phathom Pharmaceuticals 1.11%, was 1.66% Reduce −23.0% 1,390,100 $8.12 $11M −414,393 −$21M
SGRY, Surgery Partners 1.07%, was 1.36% Reduce −37.8% 514,200 $21.17 $11M −312,800 −$16M
ORIC, Oric Pharmaceuticals 1.00% Reduce −12.6% 1,265,200 $8.07 $10M −181,919 −$4.6M
NAMS 0.89% Reduce −60.2% 354,000 $25.70 $9.1M −535,700 −$5.7M
INCY, Incyte 0.88%, was 1.04% Reduce −57.9% 129,600 $69.07 $9M −178,510 −$11M
CATX, Perspective Therapeutics 0.84%, was 2.35% Reduce −21.8% 2,694,600 $3.19 $8.6M −749,402 −$37M
ASND, Ascendis Pharma A/s 0.84%, was 0.91% Reduce −47.9% 62,000 $137.67 $8.5M −57,000 −$9.2M
BHVN, Biohaven 0.82%, was 1.19% Reduce −52.1% 222,900 $37.35 $8.3M −242,100 −$15M
Intra-Cellular Therapies 0.80%, was 0.87% Reduce −58.4% 97,000 $83.52 $8.1M −136,000 −$8.9M
IMUX, Immunic 0.78% Reduce −3.6% 7,966,400 $1.00 $8M −299,600 −$5.7M
CNTX, Context Therapeutics 0.77%, was 0.74% Add +0.8% 7,477,200 $1.05 $7.9M +60,045 −$6.7M
ORKA, Oruka Therapeutics 0.67%, was 0.99% Reduce −55.5% 352,124 $19.39 $6.8M −438,802 −$13M
REGN, Regeneron 0.59% New 8,400 $712.33 $6M +8,400 +$6M
BRKR, Bruker 0.44% New 76,300 $58.62 $4.5M +76,300 +$4.5M
Vera Therapeutics 0.42% New 100,000 $42.29 $4.2M +100,000 +$4.2M

Showing top 50 of 61 by value

Exits / last held

Gone since 2024 Q3, shown at their last reported size.

Stock % of portfolio Recent activity Shares Reported price* Value Share change $ change
NMRA, Neumora Therapeutics 1.21% Exit 0 $13.21 $24M −1,800,000 −$24M
BMRN, Biomarin Pharmaceutical 1.15% Exit 0 $70.29 $22M −320,000 −$22M
ARGX, Argenx 1.06% Exit 0 $542.07 $21M −38,200 −$21M
GPCR, Structure Therapeutics 0.96% Exit 0 $43.89 $19M −430,900 −$19M
NGNE, Neurogene 0.91% Exit 0 $41.96 $18M −425,041 −$18M
TERN, Terns Pharmaceuticals 0.91% Exit 0 $8.34 $18M −2,133,872 −$18M
BNTX, Biontech 0.88% Exit 0 $118.77 $17M −145,000 −$17M
ZTS, Zoetis 0.71% Exit 0 $195.38 $14M −71,000 −$14M
Immunome 0.65% Exit 0 $14.62 $13M −873,891 −$13M
APGE, Apogee Therapeutics 0.46% Exit 0 $58.74 $9M −154,000 −$9M
PRVA, Privia Health Group 0.43% Exit 0 $18.21 $8.5M −466,800 −$8.5M
CYBN, Cybin 0.42% Exit 0 $8.89 $8.2M −918,000 −$8.2M
ESTA, Establishment Labs 0.37% Exit 0 $43.27 $7.3M −169,000 −$7.3M
CGEM, Cullinan Therapeutics 0.36% Exit 0 $16.74 $7.1M −425,000 −$7.1M
Immunocore 0.32% Exit 0 $31.13 $6.2M −200,000 −$6.2M
SNY, Sanofi 0.29% Exit 0 $57.63 $5.8M −100,000 −$5.8M
EDIT, Editas Medicine 0.25% Exit 0 $3.41 $5M −1,465,000 −$5M
Kezar Life Sciences 0.20% Exit 0 $0.7732 $3.9M −5,026,000 −$3.9M
IMVT, Immunovant 0.14% Exit 0 $28.51 $2.8M −99,000 −$2.8M
ANRO, Alto Neuroscience 0.14% Exit 0 $11.44 $2.7M −240,000 −$2.7M
PRME, Prime Medicine 0.14% Exit 0 $3.87 $2.7M −694,000 −$2.7M
Syros Pharmaceuticals 0.12% Exit 0 $2.15 $2.3M −1,063,000 −$2.3M
Instil Bio 0.10% Exit 0 $67.32 $2M −29,100 −$2M
Prelude Therapeutics 0.09% Exit 0 $2.07 $1.8M −890,000 −$1.8M
Bluebird Bio 0.04% Exit 0 $0.5193 $847K −1,631,143 −$847K
Caremax — Exit 0 $1.70 $36K −21,200 −$36K

Weight bar: held both quarters added sold at this quarter’s reported price

* Reported price is value ÷ shares from the 13F as of period end, not a live market quote. Weight % is each long-equity position ÷ full 13F AUM, so rows may not sum to 100% when the filing includes options or other non-equity (excluded from this table). Share change and $ change are vs 2024 Q3. Click a column header to sort, or New, Hold, Add or Reduce to bring those moves to the top. Exit opens the last-held block below.

Filings history

20 periods, with AUM normalized

Newest 13Fs
Period Holds AUM QoQ Form Filed Filing ID
2026 Q2 45 $624M +41.2% 13F-HR 8/14/2026 000179182726000005
2026 Q1 45 $494M — new holds 5/28/2026 000179182726000004
2026 Q1 46 $442M +27.4% 13F-HR 5/13/2026 000179182726000003
2025 Q4 39 $347M −21.0% 13F-HR 2/13/2026 000179182726000002
2025 Q3 43 $439M −12.5% 13F-HR 11/14/2025 000179182725000008
2025 Q2 56 $502M −4.4% 13F-HR 8/14/2025 000179182725000007
2025 Q1 67 $525M −48.4% 13F-HR 5/15/2025 000179182725000005
2024 Q4 63 $1B −48.1% 13F-HR 2/14/2025 000179182725000002
2024 Q3 81 $2B −16.7% 13F-HR 11/14/2024 000179182724000011
2024 Q2 85 $2.4B −24.1% 13F-HR 8/14/2024 000179182724000007
2024 Q1 90 $3.1B +13.0% 13F-HR 5/15/2024 000179182724000004
2023 Q4 74 $2.7B +10.5% 13F-HR 2/14/2024 000179182724000002
2023 Q3 83 $2.5B −13.3% 13F-HR 11/14/2023 000179182723000006
2023 Q2 93 $2.9B −5.0% 13F-HR 8/14/2023 000179182723000004
2023 Q1 83 $3B −34.7% 13F-HR 5/15/2023 000179182723000003
2022 Q4 85 $4.6B −6.2% 13F-HR 2/14/2023 000179182723000002
2022 Q3 97 $4.9B +12.9% 13F-HR 11/14/2022 000179182722000008
2022 Q2 82 $4.4B −9.3% 13F-HR 8/15/2022 000179182722000006
2022 Q1 92 $4.8B +1.9% 13F-HR 5/16/2022 000179182722000004
2021 Q4 97 $4.7B +4.5% 13F-HR 2/14/2022 000179182722000002
2021 Q3 105 $4.5B — 13F-HR 11/15/2021 000179182721000006

About

Avidity Partners Management LP

21 processed 13Fs on this site, 2021 Q3 to 2026 Q2

Entity
Avidity Partners Management LP
Notable person
David Witzke
Location
Dallas, TX
All SEC filings
View on sec.gov

Further reading

As an Amazon Associate, FollowTheFilings earns from qualifying purchases.

  • The Essays of Warren Buffett, 8th Ed., Warren Buffett, Lawrence A. Cunningham View on Amazon
  • One Up On Wall Street (Lynch), Peter Lynch View on Amazon

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