DEERFIELD MANAGEMENT COMPANY, L.P.

$8.5B reported 13(f) long value · latest quarter 2026-03-31 · CIK 0001009258 · EDGAR ↗
A quarter-end snapshot. Filed up to 45 days later, so this page is not current holdings and never a complete portfolio. what a 13F is — and is not ↓ · methodology §13F ↗
Period
$8.5B
reported valuesum of disclosed values for 2026-03-31; 0 positions carry a NULL value and are excluded from the sum, surfaced here rather than folded away
82
positionsALL retained default holdings for this (filer, period), including NULL-value ones
12
new stakespositions with no comparable holding in the prior quarter (kind new), 2026-03-31
80
exitspositions absent from this quarter's filing after being held last quarter (kind exit), 2026-03-31 — inferred from absence, not a sale record

Position changes — into 2026-03-31

by shares · Δ value · filing link · how changes are classified §
Position changes into quarter 2026-03-31
Positionposition matched across quarters by exact reported CUSIP over a registry gap — producer-reconciled identity, never a name match identity_reconciled_by_cusipChangethe reported share count is unchanged across the pair, so the position reads as held rather than as a buy or a sell; only builds before this release inferred a direction from the reported value instead classified_by_value · "exit" = absent this quarter: disposed, delisted, under confidential treatment, or reported instead by an affiliated manager — the filing does not say which · change not classifiable: value undisclosed on one side of the quarter pair, or neither shares nor value can classify it · "no change" = the share count is identical in both quarters; the value moved only with price, so the row is mark-to-market and never an add or a trim (Add / New / Trim / Exit / No change) · "no prior" = this filer has no comparable holdings list for the previous quarter on record — a first filing under this registration, or a quarter reported inside an affiliated manager's filing — so the position is not called a new stakeΔ valuederived by Public Filings from the published aggregate; NULL means the source did not disclose a usable value — never zeroΔ sharesreported unit changed across the pair (SH↔PRN); the share delta is withheld rather than fabricated shares_unit_mismatchPrev valueCurr valuePrev sharesCurr sharesFlags
PRAXIS PRECISION MEDICINES I COM NEWposition key pos:11991 · issuer key iss:1748add+$44.1M+60,000$266M$310M903,351963,351
UNITED THERAPEUTICS CORP DEL COMposition key pos:15902 · issuer key iss:2217add+$63.4M+31,007$208M$271M425,993457,000
REVOLUTION MEDICINES INC COMposition key pos:15541 · issuer key iss:1842trim−$7.2M−597,613$231M$223M2,894,6132,297,000
ARROWHEAD PHARMACEUTICALS IN NOTE 1/1position key pos:12542 · issuer key iss:249 PRNnew+$207M+200,000,000$0$207M200,000,000
CENTENE CORP DEL COMposition key pos:13554 · issuer key iss:546trim−$71.6M−530,907$265M$194M6,447,9985,917,091
LARIMAR THERAPEUTICS INC COMposition key sid:sec:prov:853ca021ff04669801b685877f2dabbb · issuer key cusip6:517125add+$43.6M+5,000,000$117M$160M30,606,97435,606,974
VERA THERAPEUTICS INC CL Aposition key sid:sec:prov:c6f0567aff349dfe2dab4a6ee5ba8988 · issuer key cusip6:92337Rtrim−$55.8M−337,595$206M$150M4,059,6953,722,100
BIOCRYST PHARMACEUTICALS INC COMposition key pos:15962 · issuer key iss:374add+$31.3M+697,000$112M$143M14,341,00015,038,000
INSPIRE MED SYS INC COMposition key pos:14444 · issuer key iss:1183add+$546K+1,197,366$139M$139M1,505,8722,703,238
LEGEND BIOTECH CORP SPONSORED ADSposition key sid:sec:prov:235b0febe313b5e3f4a7bc8d76a41721 · issuer key cusip6:52490Gadd+$10.1M+1,755,638$129M$139M5,932,0007,687,638
NEWAMSTERDAM PHARMA COMPANY ORDINARY SHARESposition key pos:17285 · issuer key iss:2704add−$9.6M+100,000$146M$137M4,164,7894,264,789
ARROWHEAD PHARMACEUTICALS IN COMposition key pos:16618 · issuer key iss:249trim−$23.0M−259,649$122M$98.6M1,832,9461,573,297
CATALYST PHARMACEUTICALS INC COMposition key pos:15084 · issuer key iss:535trim−$17.0M−967,561$115M$97.6M4,911,1613,943,600
INDIVIOR PHARMACEUTICALS INC COMposition key pos:18425 · issuer key iss:1171new+$94.4M+3,097,790$0$94.4M3,097,790
XENON PHARMACEUTICALS INC COMposition key pos:13384 · issuer key iss:2365add+$69.7M+1,073,676$24.3M$94.0M542,0201,615,696
SYNDAX PHARMACEUTICALS INC COMposition key sid:sec:prov:eb359106a5c4d721cdc955ced4da0795 · issuer key cusip6:87164Fnew+$88.3M+3,779,900$0$88.3M3,779,900
TANGO THERAPEUTICS INC COMposition key pos:12388 · issuer key iss:2086add+$61.0M+1,239,867$25.8M$86.8M2,906,9464,146,813
DIANTHUS THERAPEUTICS INC COMposition key pos:18462 · issuer key iss:731new+$85.6M+1,019,813$0$85.6M1,019,813
PFIZER INC COMposition key pos:11636 · issuer key iss:1709new+$85.4M+3,040,000$0$85.4M3,040,000
NEUROCRINE BIOSCIENCES INC COMposition key pos:12315 · issuer key iss:1552trim−$87.6M−574,345$168M$80.4M1,184,345610,000
ZENAS BIOPHARMA INC NOTE 2.500% 4/0position key sid:sec:prov:9e44fcb5d06cd4275ddb0cb55c993d45 · issuer key cusip6:98937L PRNnew+$67.3M+65,000,000$0$67.3M65,000,000
GENMAB A/S SPONSORED ADSposition key pos:17380 · issuer key iss:1001new+$66.1M+2,462,000$0$66.1M2,462,000
ENVISTA HOLDINGS CORPORATION COMposition key pos:12516 · issuer key iss:835trim+$6.6M−70,398$49.5M$56.1M2,280,4982,210,100
IDEAYA BIOSCIENCES INC COMposition key sid:sec:prov:f7d48a640772d3aa60939ca4949078c5 · issuer key cusip6:45166Atrim−$23.5M−623,035$74.4M$51.0M2,153,0431,530,008
BELITE BIO INC SPONSORED ADSposition key sid:sec:prov:831c753eb8a6ce9972092ec4165601d4 · issuer key cusip6:07782Badd+$11.1M+70,200$37.4M$48.5M233,813304,013
BIOMARIN PHARMACEUTICAL INC COMposition key pos:11882 · issuer key iss:375new+$48.1M+851,556$0$48.1M851,556
DISC MEDICINE INC COMposition key pos:13022 · issuer key iss:741add+$1.4M+145,837$40.6M$42.0M511,163657,000
EMBECTA CORP COMMON STOCKposition key pos:12610 · issuer key iss:808trim−$10.3M−217,070$32.7M$22.4M2,752,0312,534,961
TYRA BIOSCIENCES INC COMposition key sid:sec:prov:47170149b82e95e4444c881acffa67fc · issuer key cusip6:90240Bnew+$21.0M+549,000$0$21.0M549,000
FOGHORN THERAPEUTICS INC COMposition key sid:sec:prov:d7ce1f7304a65bd9fa8becb1437c7f71 · issuer key cusip6:344174add+$1.3M+745,156$19.7M$21.0M3,649,2114,394,367
BRIGHT MINDS BIOSCIENCES INC COM NEWposition key sid:sec:prov:fed138ced9737b90542a54b9484d2da0 · issuer key cusip6:10919Wnew+$20.7M+283,000$0$20.7M283,000
MONOPAR THERAPEUTICS INC COM NEWposition key sid:sec:prov:8416c67ffd3651f6a5f8d9788c0f2e31 · issuer key cusip6:61023Ladd+$6.6M+153,187$11.1M$17.7M170,558323,745
SPYGLASS PHARMA INC COM SHSposition key sid:sec:prov:04667cad8d94d5f8ff4744e87dea829b · issuer key cusip6:85220Gnew+$14.3M+550,000$0$14.3M550,000
BETA BIONICS INC COMposition key sid:sec:prov:4e7eb09ab13c64fd6730ede8dbc988b8 · issuer key cusip6:08659Badd−$15.3M+385,692$28.6M$13.3M938,3081,324,000
BIOMX INC COM NEWposition key sid:sec:prov:33cefd366aaeacb00c6016055a143d33 · issuer key cusip6:09090Dadd+$247K+2$245K$493K131,270131,272
VERADERMICS INC COMMON STOCKposition key pos:15115 · issuer key iss:2252new+$316K+5,000$0$316K5,000
pos:11213exit‡e−$2.1M−126,574$2.1M$0126,574
pos:11309exit‡e−$1.8M−660,133$1.8M$0660,133
pos:11452exit‡e−$122M−3,393,063$122M$03,393,063
pos:11587exit‡e−$1.9M−167,061$1.9M$0167,061
pos:11912exit‡e−$3.5M−13,825$3.5M$013,825
pos:11965exit‡e−$1.2M−57,277$1.2M$057,277
pos:11987exit‡e−$3.6M−49,951$3.6M$049,951
pos:12209exit‡e−$807K−68,057$807K$068,057
pos:12236exit‡e−$859K−25,835$859K$025,835
pos:12237exit‡e−$1.7M−18,798$1.7M$018,798
pos:12663exit‡e−$19.0M−765,694$19.0M$0765,694
pos:12755exit‡e−$717K−5,698$717K$05,698
pos:12968exit‡e−$1.5M−16,231$1.5M$016,231
pos:13005exit‡e−$2.1M−52,076$2.1M$052,076
pos:13203exit‡e−$406K−21,259$406K$021,259
pos:13207exit‡e−$2.1M−12,099$2.1M$012,099
pos:13229exit‡e−$1.4M−11,449$1.4M$011,449
pos:13299exit‡e−$3.2M−18,392$3.2M$018,392
pos:13340exit‡e−$3.4M−127,270$3.4M$0127,270
pos:13354 PUTexit‡e−$29.5M−1,000,000$29.5M$01,000,000
pos:13464exit‡e−$360K−2,199$360K$02,199
pos:13470exit‡e−$3.2M−164,345$3.2M$0164,345
pos:13475exit‡e−$1.0M−13,326$1.0M$013,326
pos:13535 PRNexit‡e−$28.9M−25,255,000$28.9M$025,255,000
pos:13549exit‡e−$410K−52,230$410K$052,230
pos:14120exit‡e−$343K−1,352$343K$01,352
pos:14238exit‡e−$4.0M−17,711$4.0M$017,711
pos:14500exit‡e−$23.3M−710,626$23.3M$0710,626
pos:14505exit‡e−$608K−33,987$608K$033,987
pos:14734exit‡e−$33.8M−1,999,045$33.8M$01,999,045
pos:14843exit‡e−$1.9M−27,629$1.9M$027,629
pos:14860exit‡e−$2.1M−25,815$2.1M$025,815
pos:14931exit‡e−$1.7M−11,000$1.7M$011,000
pos:14974exit‡e−$2.4M−24,941$2.4M$024,941
pos:15246exit‡e−$2.4M−20,909$2.4M$020,909
pos:15356exit‡e−$1.1M−65,344$1.1M$065,344
pos:15401exit‡e−$426K−8,693$426K$08,693
pos:15619exit‡e−$2.1M−52,555$2.1M$052,555
pos:15768exit‡e−$1.1M−5,098$1.1M$05,098
pos:15817exit‡e−$12.9M−1,107,944$12.9M$01,107,944
pos:15897exit‡e−$12.9K−733,333$12.9K$0733,333
pos:15920exit‡e−$2.2M−32,943$2.2M$032,943
pos:15944exit‡e−$2.9M−120,211$2.9M$0120,211
pos:16108exit‡e−$1.2M−3,551$1.2M$03,551
pos:16209exit‡e−$1.8M−8,985$1.8M$08,985
pos:16301exit‡e−$10.9M−260,000$10.9M$0260,000
pos:16385exit‡e−$2.5M−9,203$2.5M$09,203
pos:16392exit‡e−$460K−2,014$460K$02,014
pos:16467exit‡e−$55.0K−166,666$55.0K$0166,666
pos:16718exit‡e−$545K−52,257$545K$052,257
pos:16755exit‡e−$27.4M−354,000$27.4M$0354,000
pos:16978exit‡e−$2.6M−936,309$2.6M$0936,309
pos:17047exit‡e−$2.5M−66,438$2.5M$066,438
pos:17120exit‡e−$4.3M−69,669$4.3M$069,669
pos:17293exit‡e−$2.4M−10,104$2.4M$010,104
pos:17299exit‡e−$999K−10,323$999K$010,323
pos:17566exit‡e−$321K−11,996$321K$011,996
pos:17616exit‡e−$2.7M−6,215$2.7M$06,215
pos:17679exit‡e−$1.4M−16,606$1.4M$016,606
pos:17695exit‡e−$266K−10,284$266K$010,284
pos:17712exit‡e−$274K−483$274K$0483
pos:17918exit‡e−$638K−7,786$638K$07,786
pos:18046exit‡e−$2.3M−51,942$2.3M$051,942
pos:18144exit‡e−$3.0M−10,616$3.0M$010,616

80 more changes below.

1–100 of 116 changes
Mark-to-market only (no share change) · 46

Positions whose share count is identical in both quarters; the value changed with price, not with a decision.

Positions held with no share change into quarter 2026-03-31
Positionposition matched across quarters by exact reported CUSIP over a registry gap — producer-reconciled identity, never a name match identity_reconciled_by_cusipChangethe reported share count is unchanged across the pair, so the position reads as held rather than as a buy or a sell; only builds before this release inferred a direction from the reported value instead classified_by_value · "exit" = absent this quarter: disposed, delisted, under confidential treatment, or reported instead by an affiliated manager — the filing does not say which · change not classifiable: value undisclosed on one side of the quarter pair, or neither shares nor value can classify it · "no change" = the share count is identical in both quarters; the value moved only with price, so the row is mark-to-market and never an add or a trim (Add / New / Trim / Exit / No change) · "no prior" = this filer has no comparable holdings list for the previous quarter on record — a first filing under this registration, or a quarter reported inside an affiliated manager's filing — so the position is not called a new stakeΔ valuederived by Public Filings from the published aggregate; NULL means the source did not disclose a usable value — never zeroΔ sharesreported unit changed across the pair (SH↔PRN); the share delta is withheld rather than fabricated shares_unit_mismatchPrev valueCurr valuePrev sharesCurr sharesFlags
NUVALENT INC COMposition key pos:14079 · issuer key iss:1594no change+$32.1M0$1.7B$1.8B17,248,45017,248,450
BROOKDALE SR LIVING INC NOTE 3.500%10/1position key pos:13324 · issuer key iss:443 PRNno change+$77.9M0$427M$505M306,885,000306,885,000
COGENT BIOSCIENCES INC COMposition key pos:18333 · issuer key iss:610no change+$26.9M0$321M$348M9,043,9039,043,903
VIATRIS INC COMposition key pos:16938 · issuer key iss:2270no change+$21.4M0$252M$273M20,206,17020,206,170
MIRUM PHARMACEUTICALS INC NOTE 4.000% 5/0position key pos:14377 · issuer key iss:1485 PRNno change+$28.7M0$181M$209M70,000,00070,000,000
CELCUITY INC COMposition key pos:11232 · issuer key iss:542no change+$24.7M0$171M$196M1,714,0001,714,000
BROOKDALE SR LIVING INC COMposition key pos:11630 · issuer key iss:443no change+$33.6M0$126M$159M11,637,03211,637,032
IONIS PHARMACEUTICALS INC COMposition key pos:12370 · issuer key iss:1221no change−$8.0M0$157M$149M1,979,6691,979,669
ADAPTHEALTH CORP COMMON STOCKposition key sid:sec:prov:426666fb8d43f8a6c202109e44eb876f · issuer key cusip6:00653Qno change+$22.3M0$114M$137M11,477,73011,477,730
ACADIA HEALTHCARE COMPANY IN COMposition key pos:13278 · issuer key iss:55no change+$41.6M0$64.1M$106M4,520,0004,520,000
IONIS PHARMACEUTICALS INC NOTE 1.750% 6/1position key pos:12221 · issuer key iss:1221 PRNno change−$4.7M0$95.3M$90.6M60,000,00060,000,000
PHARVARIS N V COMposition key pos:15462 · issuer key iss:2706no change+$1.6M0$86.7M$88.3M3,126,0423,126,042
ALIGNMENT HEALTHCARE INC NOTE 4.250%11/1position key pos:14636 · issuer key iss:135 PRNno change−$6.7M0$92.6M$85.9M61,000,00061,000,000
DAY ONE BIOPHARMACEUTICALS I COMposition key sid:sec:prov:5fa73bae4b4007f19790df8489a7fcc7 · issuer key cusip6:23954Dno change+$45.1M0$34.7M$79.8M3,723,1313,723,131
SAVARA INC COMposition key sid:sec:prov:2bc6a25d40cf07124e3a03bdecf4a4df · issuer key cusip6:805111no change−$7.7M0$81.8M$74.1M13,569,00013,569,000
ENHABIT INC COMposition key sid:sec:prov:7bf659316464fda9fc46729d980abb67 · issuer key cusip6:29332Gno change+$23.1M0$43.8M$66.9M4,747,7464,747,746
NEOGENOMICS INC NOTE 0.250% 1/1position key pos:14768 · issuer key iss:1542 PRNno change+$2.0M0$64.7M$66.7M72,689,00072,689,000
BIO RAD LABS INC CL Aposition key pos:14841 · issuer key iss:373no change−$5.5M0$68.5M$63.0M226,070226,070
LANTHEUS HLDGS INC COMposition key pos:14656 · issuer key iss:1326no change+$7.7M0$55.1M$62.8M827,999827,999
ARS PHARMACEUTICALS INC COMposition key pos:11241 · issuer key iss:1972no change−$27.2M0$87.4M$60.3M7,503,8127,503,812
STOKE THERAPEUTICS INC COMposition key sid:sec:prov:3fee4169345e05a49cf14bcc2babfc71 · issuer key cusip6:86150Rno change+$1.5M0$57.9M$59.4M1,823,5001,823,500
KYMERA THERAPEUTICS INC COMposition key pos:13465 · issuer key iss:1310no change+$3.1M0$43.7M$46.7M561,170561,170
CERTARA INC COMposition key pos:15467 · issuer key iss:557no change−$24.3M0$68.8M$44.5M7,808,6057,808,605
BRIDGEBIO ONCOLOGY THERAPEUT COM NEWposition key pos:12931 · issuer key iss:426no change−$17.4M0$61.2M$43.7M4,885,4464,885,446
LIVANOVA PLC NOTE 2.500% 3/1position key sid:sec:prov:e40e4bba291a4c5e0e2b5429181fff16 · issuer key cusip6:53802L PRNno change+$308K0$39.7M$40.0M34,280,00034,280,000
SIONNA THERAPEUTICS INC COMposition key pos:11054 · issuer key iss:1980no change−$1.0M0$39.9M$38.9M970,590970,590
CAREDX INC COMposition key pos:13317 · issuer key iss:517no change−$3.2M0$41.3M$38.0M2,191,0002,191,000
STRUCTURE THERAPEUTICS INC SPONSORED ADSposition key sid:sec:prov:862b191ccb923fc424f39385b48ce4f8 · issuer key cusip6:86366Eno change−$16.4M0$53.4M$37.0M767,993767,993
IMMUNOCORE HLDGS PLC NOTE 2.500% 2/0position key pos:18629 · issuer key iss:1166 PRNno change−$56.7K0$27.1M$27.0M30,000,00030,000,000
VERACYTE INC COMposition key pos:15789 · issuer key iss:2254no change−$7.2M0$30.6M$23.4M726,000726,000
ALNYLAM PHARMACEUTICALS INC COMposition key pos:16018 · issuer key iss:150no change−$4.5M0$27.0M$22.5M67,93567,935
COMPASS THERAPEUTICS INC COMposition key sid:sec:prov:c5f3f37de4d48fd1b29c266e9a76eb0b · issuer key cusip6:20454Bno change−$288K0$19.4M$19.1M3,606,0003,606,000
KYVERNA THERAPEUTICS INC COMposition key sid:sec:prov:025f5bfc45d0f21f39b99aeb6192bfc1 · issuer key cusip6:501976no change−$1.5M0$18.8M$17.3M2,000,0002,000,000
TAYSHA GENE THERAPIES INC COM SHSposition key pos:14669 · issuer key iss:2095no change−$2.8M0$15.0M$12.2M2,722,1652,722,165
THE ONCOLOGY INSTITUTE INC COMposition key pos:17032 · issuer key iss:1622no change−$1.6M0$12.0M$10.3M3,360,0523,360,052
CULLINAN THERAPEUTICS INC COMposition key pos:13492 · issuer key iss:693no change+$1.5M0$4.0M$5.5M386,169386,169
ANNEXON INC COMposition key sid:sec:prov:45f58e3bf467aafd3516eb30bc85b601 · issuer key cusip6:03589Wno change+$304K0$2.9M$3.2M583,913583,913
ALECTOR INC COMposition key sid:sec:prov:1c7c81831d7de024bffc2474a53ee4b9 · issuer key cusip6:014442no change+$623K0$1.6M$2.3M1,055,1921,055,192
NEWAMSTERDAM PHARMA COMPANY *W EXP 99/99/999position key pos:14719 · issuer key iss:2704no change−$275K0$2.1M$1.9M92,78792,787
EDWARDS LIFESCIENCES CORP COMposition key pos:17342 · issuer key iss:799no change−$70.8K0$1.2M$1.1M13,70213,702
HUMANA INC COMposition key pos:11393 · issuer key iss:1136no change−$75.9K0$235K$159K917917
THE ONCOLOGY INSTITUTE INC *W EXP 99/99/999position key pos:12171 · issuer key iss:1622no change−$95.9K0$151K$54.8K1,250,0001,250,000
QUANTUM SI INC *W EXP 06/10/202position key sid:sec:prov:caf6739f474e5aab1341e36d2fc446d1 · issuer key cusip6:74765Kno change−$30.6K0$66.8K$36.2K333,333333,333
PMV PHARMACEUTICALS INC COMposition key sid:sec:prov:325eed3e19d59a984be6eb2201e2d894 · issuer key cusip6:69353Yno change−$880$11.0K$10.9K8,7908,790
SURROZEN INC *W EXP 08/01/203position key sid:sec:prov:c4f97db1890f36f80c7a359d19822318 · issuer key cusip6:86889Pno change−$6660$3.3K$2.7K166,666166,666
MYRIAD GENETICS INC COMposition key pos:16125 · issuer key iss:1518no change−$8330$3.1K$2.3K505505
Quarter ended 2026-03-31Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.
Truncated by Public Filings. Changes derive from the aggregate's top-25 slices and keyable positions only; unkeyable holdings are counted in the registry, not differenced. methodology §13F ↗

Book shape

2026-03-31 · concentration · vs tracked median · tick = median
Top-25 concentration
74.4%below median 80.0%
Concentration index
602 bpsabove median 446 bps
Positions with value
82 / 82median book 97.5 positions

Concentration uses reported 13F long value, not total assets. The index is withheld when any position lacks a value. Medians are over the 8,748 tracked filers with a 2026-03-31 book; the index median over the 8,662 with a complete book.

null-value positions: 0holdings whose <value> did not parse — retained and counted, never zero-filled · top-N share ·§: 74.4%share of the period's disclosed value held in the top-N positions; denominator is reported 13F value, not total assets · HHI (bps) ·§: 602integer Herfindahl–Hirschman index in basis points over disclosed position values · QoQ moves: 162

Filing history

AVAILABLE QUARTERS
Available filing periods
PeriodSource
2026-03-31EDGAR ↗

PLANNED sector rotation · Congress overlap · signals for this filer

Complete source filings on SEC EDGAR

The complete filing on EDGAR.

The position list above is served from the published Public Filings build — every position this filer reported for the selected quarter, as it reported it. This block is provenance, not a substitute: the filing itself is the record, and it is one click away. Serving this list is M2-CONTRACT §3, amended 2026-08-02; §3.1 keeps live EDGAR for filings newer than this build.

Open DEERFIELD MANAGEMENT COMPANY, L.P.'s 13F filings on SEC EDGAR ↗
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Quarter-end holdings as filed

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Prior quarter not yet availableThis build carries one quarter for this manager: 2026-03-31. Notable managers carry four published quarters, others two.

Reported positions — 2026-03-31

1–77 of 77 issuers · $8.5B disclosed value over 82 rows · 0 undisclosed-value rows
Every row below carries ticker not yet mapped — stated once here rather than repeated on every row.
Positions DEERFIELD MANAGEMENT COMPANY, L.P. reported for the quarter ended 2026-03-31, as that filer reported them
KindClassification is not joined into this reported-position view. Use the changed-positions view to compare the two published quarters.TickerThis list carries reported issuer names and security identities, without a dated ticker mapping. Symbols are not inferred from names.Issuera position composed from a base filing plus NEW-HOLDINGS amendments keeps every source row here; the composition's latest filed date is the one shown served from this build's published holdings (derived from the filer's own reported rows); every row resolves to its filingWeightShare of total reported value, calculated only when the full position list has disclosed values. This is 13F long value, not total assets.Valuevalue undisclosed on the filing: retained and counted, excluded from sums, never shown as $0SharesPosition changeShare change is available in the separate comparison view; it is not joined into this position list.WtCongressThe congressional transaction join is unavailable in this build.
NUVLverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)NUVALENT INC NUVALENT INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$1.8B17,248,45020.8%
BKDverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)BROOKDALE SR LIVING INC
2 positions · 2 reported rows
Rows DEERFIELD MANAGEMENT COMPANY, L.P. reported for BROOKDALE SR LIVING INC, as it reported them
BROOKDALE SR LIVING INC · NOTE 3.500%10/1 CUSIP — $505M306,885,000 PRN
BROOKDALE SR LIVING INC · COM CUSIP — $159M11,637,032
$665M7.8%
COGTverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)COGENT BIOSCIENCES INC COGENT BIOSCIENCES INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$348M9,043,9034.1%
PRAXverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)PRAXIS PRECISION MEDICINES I PRAXIS PRECISION MEDICINES I · COM NEW CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$310M963,3513.7%
ARWRverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)ARROWHEAD PHARMACEUTICALS IN
2 positions · 2 reported rows
Rows DEERFIELD MANAGEMENT COMPANY, L.P. reported for ARROWHEAD PHARMACEUTICALS IN, as it reported them
ARROWHEAD PHARMACEUTICALS IN · NOTE 1/1 CUSIP — $207M200,000,000 PRN
ARROWHEAD PHARMACEUTICALS IN · COM CUSIP — $98.6M1,573,297
$306M3.6%
VTRSverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)VIATRIS INC VIATRIS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$273M20,206,1703.2%
UTHRverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)UNITED THERAPEUTICS CORP DEL UNITED THERAPEUTICS CORP DEL · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$271M457,0003.2%
IONSverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)IONIS PHARMACEUTICALS INC
2 positions · 2 reported rows
Rows DEERFIELD MANAGEMENT COMPANY, L.P. reported for IONIS PHARMACEUTICALS INC, as it reported them
IONIS PHARMACEUTICALS INC · COM CUSIP — $149M1,979,669
IONIS PHARMACEUTICALS INC · NOTE 1.750% 6/1 CUSIP — $90.6M60,000,000 PRN
$239M2.8%
RVMDverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)REVOLUTION MEDICINES INC REVOLUTION MEDICINES INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$223M2,297,0002.6%
MIRUM PHARMACEUTICALS INC MIRUM PHARMACEUTICALS INC · NOTE 4.000% 5/0 CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$209M70,000,000 PRN2.5%
CELCverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CELCUITY INC CELCUITY INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$196M1,714,0002.3%
CNCverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CENTENE CORP DEL CENTENE CORP DEL · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$194M5,917,0912.3%
LARIMAR THERAPEUTICS INC LARIMAR THERAPEUTICS INC · COM CUSIP 517125100
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$160M35,606,9741.9%
VERA THERAPEUTICS INC VERA THERAPEUTICS INC · CL A CUSIP 92337R101
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$150M3,722,1001.8%
BCRXverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)BIOCRYST PHARMACEUTICALS INC BIOCRYST PHARMACEUTICALS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$143M15,038,0001.7%
INSPverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)INSPIRE MED SYS INC INSPIRE MED SYS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$139M2,703,2381.6%
LEGEND BIOTECH CORP LEGEND BIOTECH CORP · SPONSORED ADS CUSIP 52490G102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$139M7,687,6381.6%
NAMSverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)NEWAMSTERDAM PHARMA COMPANY
2 positions · 2 reported rows
Rows DEERFIELD MANAGEMENT COMPANY, L.P. reported for NEWAMSTERDAM PHARMA COMPANY, as it reported them
NEWAMSTERDAM PHARMA COMPANY · ORDINARY SHARES CUSIP — $137M4,264,789
NEWAMSTERDAM PHARMA COMPANY · *W EXP 99/99/999 CUSIP — $1.9M92,787
$138M4,357,5761.6%
ADAPTHEALTH CORP ADAPTHEALTH CORP · COMMON STOCK CUSIP 00653Q102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$137M11,477,7301.6%
ACHCverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)ACADIA HEALTHCARE COMPANY IN ACADIA HEALTHCARE COMPANY IN · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$106M4,520,0001.2%
CPRXverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CATALYST PHARMACEUTICALS INC CATALYST PHARMACEUTICALS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$97.6M3,943,6001.2%
INDVverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)INDIVIOR PHARMACEUTICALS INC INDIVIOR PHARMACEUTICALS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$94.4M3,097,7901.1%
XENEverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)XENON PHARMACEUTICALS INC XENON PHARMACEUTICALS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$94.0M1,615,6961.1%
PHVSverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)PHARVARIS N V PHARVARIS N V · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$88.3M3,126,0421.0%
SYNDAX PHARMACEUTICALS INC SYNDAX PHARMACEUTICALS INC · COM CUSIP 87164F105
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$88.3M3,779,9001.0%
TNGXverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)TANGO THERAPEUTICS INC TANGO THERAPEUTICS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$86.8M4,146,8131.0%
ALIGNMENT HEALTHCARE INC ALIGNMENT HEALTHCARE INC · NOTE 4.250%11/1 CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$85.9M61,000,000 PRN1.0%
DNTHverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)DIANTHUS THERAPEUTICS INC DIANTHUS THERAPEUTICS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$85.6M1,019,8131.0%
PFEverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)PFIZER INC PFIZER INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$85.4M3,040,0001.0%
NBIXverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)NEUROCRINE BIOSCIENCES INC NEUROCRINE BIOSCIENCES INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$80.4M610,0000.9%
DAY ONE BIOPHARMACEUTICALS I DAY ONE BIOPHARMACEUTICALS I · COM CUSIP 23954D109
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$79.8M3,723,1310.9%
SAVARA INC SAVARA INC · COM CUSIP 805111101
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$74.1M13,569,0000.9%
ZENAS BIOPHARMA INC ZENAS BIOPHARMA INC · NOTE 2.500% 4/0 CUSIP 98937LAA3
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$67.3M65,000,000 PRN0.8%
ENHABIT INC ENHABIT INC · COM CUSIP 29332G102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$66.9M4,747,7460.8%
NEOGENOMICS INC NEOGENOMICS INC · NOTE 0.250% 1/1 CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$66.7M72,689,000 PRN0.8%
GMABverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)GENMAB A/S GENMAB A/S · SPONSORED ADS CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$66.1M2,462,0000.8%
BIOverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)BIO RAD LABS INC BIO RAD LABS INC · CL A CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$63.0M226,0700.7%
LNTHverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)LANTHEUS HLDGS INC LANTHEUS HLDGS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$62.8M827,9990.7%
SPRYverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)ARS PHARMACEUTICALS INC ARS PHARMACEUTICALS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$60.3M7,503,8120.7%
STOKE THERAPEUTICS INC STOKE THERAPEUTICS INC · COM CUSIP 86150R107
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$59.4M1,823,5000.7%
NVSTverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)ENVISTA HOLDINGS CORPORATION ENVISTA HOLDINGS CORPORATION · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$56.1M2,210,1000.7%
IDEAYA BIOSCIENCES INC IDEAYA BIOSCIENCES INC · COM CUSIP 45166A102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$51.0M1,530,0080.6%
BELITE BIO INC BELITE BIO INC · SPONSORED ADS CUSIP 07782B104
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$48.5M304,0130.6%
BMRNverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)BIOMARIN PHARMACEUTICAL INC BIOMARIN PHARMACEUTICAL INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$48.1M851,5560.6%
KYMRverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)KYMERA THERAPEUTICS INC KYMERA THERAPEUTICS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$46.7M561,1700.6%
CERTverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CERTARA INC CERTARA INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$44.5M7,808,6050.5%
BBOTverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)BRIDGEBIO ONCOLOGY THERAPEUT BRIDGEBIO ONCOLOGY THERAPEUT · COM NEW CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$43.7M4,885,4460.5%
IRONverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)DISC MEDICINE INC DISC MEDICINE INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$42.0M657,0000.5%
LIVANOVA PLC LIVANOVA PLC · NOTE 2.500% 3/1 CUSIP 53802LAB8
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$40.0M34,280,000 PRN0.5%
SIONverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)SIONNA THERAPEUTICS INC SIONNA THERAPEUTICS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$38.9M970,5900.5%
CDNAverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CAREDX INC CAREDX INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$38.0M2,191,0000.4%
STRUCTURE THERAPEUTICS INC STRUCTURE THERAPEUTICS INC · SPONSORED ADS CUSIP 86366E106
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$37.0M767,9930.4%
IMMUNOCORE HLDGS PLC IMMUNOCORE HLDGS PLC · NOTE 2.500% 2/0 CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$27.0M30,000,000 PRN0.3%
VCYTverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)VERACYTE INC VERACYTE INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$23.4M726,0000.3%
ALNYverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)ALNYLAM PHARMACEUTICALS INC ALNYLAM PHARMACEUTICALS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$22.5M67,9350.3%
EMBCverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)EMBECTA CORP EMBECTA CORP · COMMON STOCK CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$22.4M2,534,9610.3%
TYRA BIOSCIENCES INC TYRA BIOSCIENCES INC · COM CUSIP 90240B106
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$21.0M549,0000.2%
FOGHORN THERAPEUTICS INC FOGHORN THERAPEUTICS INC · COM CUSIP 344174107
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$21.0M4,394,3670.2%
BRIGHT MINDS BIOSCIENCES INC BRIGHT MINDS BIOSCIENCES INC · COM NEW CUSIP 10919W405
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$20.7M283,0000.2%
COMPASS THERAPEUTICS INC COMPASS THERAPEUTICS INC · COM CUSIP 20454B104
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$19.1M3,606,0000.2%
MONOPAR THERAPEUTICS INC MONOPAR THERAPEUTICS INC · COM NEW CUSIP 61023L207
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$17.7M323,7450.2%
KYVERNA THERAPEUTICS INC KYVERNA THERAPEUTICS INC · COM CUSIP 501976104
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$17.3M2,000,0000.2%
SPYGLASS PHARMA INC SPYGLASS PHARMA INC · COM SHS CUSIP 85220G109
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$14.3M550,0000.2%
BETA BIONICS INC BETA BIONICS INC · COM CUSIP 08659B102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$13.3M1,324,0000.2%
TSHAverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)TAYSHA GENE THERAPIES INC TAYSHA GENE THERAPIES INC · COM SHS CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$12.2M2,722,1650.1%
THE ONCOLOGY INSTITUTE INC
2 positions · 2 reported rows
Rows DEERFIELD MANAGEMENT COMPANY, L.P. reported for THE ONCOLOGY INSTITUTE INC, as it reported them
THE ONCOLOGY INSTITUTE INC · COM CUSIP — $10.3M3,360,052
THE ONCOLOGY INSTITUTE INC · *W EXP 99/99/999 CUSIP — $54.8K1,250,000
$10.4M4,610,0520.1%
CGEMverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CULLINAN THERAPEUTICS INC CULLINAN THERAPEUTICS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$5.5M386,1690.1%
ANNEXON INC ANNEXON INC · COM CUSIP 03589W102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$3.2M583,9130.0%
ALECTOR INC ALECTOR INC · COM CUSIP 014442107
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$2.3M1,055,1920.0%
EWverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)EDWARDS LIFESCIENCES CORP EDWARDS LIFESCIENCES CORP · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$1.1M13,7020.0%
BIOMX INC BIOMX INC · COM NEW CUSIP 09090D509
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$493K131,2720.0%
MANEverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)VERADERMICS INC VERADERMICS INC · COMMON STOCK CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$316K5,0000.0%
HUMverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)HUMANA INC HUMANA INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$159K9170.0%
QUANTUM SI INC QUANTUM SI INC · *W EXP 06/10/202 CUSIP 74765K113
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$36.2K333,3330.0%
PMV PHARMACEUTICALS INC PMV PHARMACEUTICALS INC · COM CUSIP 69353Y103
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$10.9K8,7900.0%
SURROZEN INC SURROZEN INC · *W EXP 08/01/203 CUSIP 86889P117
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$2.7K166,6660.0%
MYGNverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)MYRIAD GENETICS INC MYRIAD GENETICS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$2.3K5050.0%
1–77 of 77 issuers · page 1 of 1
every row this filer reported for the quarter, as it reported it — cross-filer de-duplication is applied to issuer totals elsewhere and never deletes a row here
A 13F is a quarterly, long-only snapshot filed up to 45 days late — not current holdings. what a 13F covers ↗

13F reports cover LONG positions in Section 13(f) securities (US exchange-traded equities plus reportable options, warrants, certain convertibles) held by managers with at least $100M in such securities — so managers below that threshold are absent entirely. No short positions, no cash, no non-13(f) assets — not a full portfolio, and not a census of institutional ownership.

Positions are quarter-end snapshots filed up to 45 days late — not current holdings. A position may have been changed or closed before you ever see it, and is older still by however long ago that quarter ended.

Values are the manager's stated market value at quarter-end in era-dependent units (whole dollars for form versions effective 2023-01-03 onward, thousands before), normalized here to whole dollars with unit_basis carried on every record.

Affiliated managers may report the same position (otherManager), so one position can appear under more than one filer.

Positions under confidential treatment may be omitted until a later amendment discloses them.

These are disclosures, not investment advice (ARCHITECTURE.md §5.2 / M2-CONTRACT §5).