DEERFIELD MANAGEMENT COMPANY, L.P.

$8.5B reported 13(f) long value · latest quarter 2026-03-31 · CIK 1009258 · EDGAR ↗
sum 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
$8.5B
ALL retained default holdings for this (filer, period), including NULL-value ones
82
positions with no comparable holding in the prior quarter (kind new), 2026-03-31
12
positions absent from this quarter's filing after being held last quarter (kind exit), 2026-03-31 — inferred from absence, not a sale record
80
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 ↗
FILING WINDOW OPEN
Quarter 2026-09-30: the 13F window is open until 2026-11-16. Rankings and QoQ moves that touch this quarter are provisional by construction — filers who have not yet reported are not zeros.

Position changes — into 2026-03-31

by shares · Δ value · filing link · how changes are classified §
Period
Position changes into quarter 2026-03-31
position matched across quarters by exact reported CUSIP over a registry gap — producer-reconciled identity, never a name match identity_reconciled_by_cusipthe reported share count is unchanged across the pair; this build's data classified the change from its reported value; builds from 2026-09-10 on read it as NO CHANGE 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 (NEW / ADD / 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 stakederived by Public Filings from the published aggregate; NULL means the source did not disclose a usable value — never zeroreported unit changed across the pair (SH↔PRN); the share delta is withheld rather than fabricated shares_unit_mismatchPrev valueCurr valuePrev sharesCurr shares
position key pos:11142 · issuer key iss:1475 COM NEWADD+$44.1M+60,000$266M$310M903,351963,351
position key pos:15016 · issuer key iss:1868 COMADD+$63.4M+31,007$208M$271M425,993457,000
position key pos:14656 · issuer key iss:1552 COMTRIM−$7.2M−597,613$231M$223M2,894,6132,297,000
position key pos:11689 · issuer key iss:172 NOTE 1/1 PRNNEW+$207M+200,000,000$0$207M—200,000,000
position key pos:12687 · issuer key iss:419 COMTRIM−$71.6M−530,907$265M$194M6,447,9985,917,091
position key sid:sec:prov:853ca021ff04669801b685877f2dabbb · issuer key cusip6:517125 COMADD+$43.6M+5,000,000$117M$160M30,606,97435,606,974
position key sid:sec:prov:c6f0567aff349dfe2dab4a6ee5ba8988 · issuer key cusip6:92337R CL ATRIM−$55.8M−337,595$206M$150M4,059,6953,722,100
position key pos:15075 · issuer key iss:265 COMADD+$31.3M+697,000$112M$143M14,341,00015,038,000
position key pos:13569 · issuer key iss:975 COMADD+$546K+1,197,366$139M$139M1,505,8722,703,238
position key sid:sec:prov:235b0febe313b5e3f4a7bc8d76a41721 · issuer key cusip6:52490G SPONSORED ADSADD+$10.1M+1,755,638$129M$139M5,932,0007,687,638
position key pos:16384 · issuer key iss:2294 ORDINARY SHARESADD−$9.6M+100,000$146M$137M4,164,7894,264,789
position key pos:15725 · issuer key iss:172 COMTRIM−$23.0M−259,649$122M$98.6M1,832,9461,573,297
position key pos:14204 · issuer key iss:409 COMTRIM−$17.0M−967,561$115M$97.6M4,911,1613,943,600
position key pos:17511 · issuer key iss:963 COMNEW+$94.4M+3,097,790$0$94.4M—3,097,790
position key pos:12517 · issuer key iss:1997 COMADD+$69.7M+1,073,676$24.3M$94.0M542,0201,615,696
position key sid:sec:prov:eb359106a5c4d721cdc955ced4da0795 · issuer key cusip6:87164F COMNEW+$88.3M+3,779,900$0$88.3M—3,779,900
position key pos:11535 · issuer key iss:1757 COMADD+$61.0M+1,239,867$25.8M$86.8M2,906,9464,146,813
position key pos:17547 · issuer key iss:577 COMNEW+$85.6M+1,019,813$0$85.6M—1,019,813
position key pos:10790 · issuer key iss:1444 COMNEW+$85.4M+3,040,000$0$85.4M—3,040,000
position key pos:11462 · issuer key iss:1296 COMTRIM−$87.6M−574,345$168M$80.4M1,184,345610,000
position key sid:sec:prov:9e44fcb5d06cd4275ddb0cb55c993d45 · issuer key cusip6:98937L NOTE 2.500% 4/0 PRNNEW+$67.3M+65,000,000$0$67.3M—65,000,000
position key pos:16478 · issuer key iss:814 SPONSORED ADSNEW+$66.1M+2,462,000$0$66.1M—2,462,000
position key pos:11663 · issuer key iss:670 COMTRIM+$6.6M−70,398$49.5M$56.1M2,280,4982,210,100
position key sid:sec:prov:f7d48a640772d3aa60939ca4949078c5 · issuer key cusip6:45166A COMTRIM−$23.5M−623,035$74.4M$51.0M2,153,0431,530,008
position key sid:sec:prov:831c753eb8a6ce9972092ec4165601d4 · issuer key cusip6:07782B SPONSORED ADSADD+$11.1M+70,200$37.4M$48.5M233,813304,013
position key pos:11035 · issuer key iss:266 COMNEW+$48.1M+851,556$0$48.1M—851,556
position key pos:12161 · issuer key iss:587 COMADD+$1.4M+145,837$40.6M$42.0M511,163657,000
position key pos:11757 · issuer key iss:644 COMMON STOCKTRIM−$10.3M−217,070$32.7M$22.4M2,752,0312,534,961
position key sid:sec:prov:47170149b82e95e4444c881acffa67fc · issuer key cusip6:90240B COMNEW+$21.0M+549,000$0$21.0M—549,000
position key sid:sec:prov:d7ce1f7304a65bd9fa8becb1437c7f71 · issuer key cusip6:344174 COMADD+$1.3M+745,156$19.7M$21.0M3,649,2114,394,367
position key sid:sec:prov:fed138ced9737b90542a54b9484d2da0 · issuer key cusip6:10919W COM NEWNEW+$20.7M+283,000$0$20.7M—283,000
position key sid:sec:prov:8416c67ffd3651f6a5f8d9788c0f2e31 · issuer key cusip6:61023L COM NEWADD+$6.6M+153,187$11.1M$17.7M170,558323,745
position key sid:sec:prov:04667cad8d94d5f8ff4744e87dea829b · issuer key cusip6:85220G COM SHSNEW+$14.3M+550,000$0$14.3M—550,000
position key sid:sec:prov:4e7eb09ab13c64fd6730ede8dbc988b8 · issuer key cusip6:08659B COMADD−$15.3M+385,692$28.6M$13.3M938,3081,324,000
position key sid:sec:prov:33cefd366aaeacb00c6016055a143d33 · issuer key cusip6:09090D COM NEWADD+$247K+2$245K$493K131,270131,272
position key pos:14234 · issuer key iss:1897 COMMON STOCKNEW+$316K+5,000$0$316K—5,000
pos:10371EXIT‡e−$2.1M−126,574$2.1M$0126,574—
pos:10466EXIT‡e−$1.8M−660,133$1.8M$0660,133—
pos:10608EXIT‡e−$122M−3,393,063$122M$03,393,063—
pos:10741EXIT‡e−$1.9M−167,061$1.9M$0167,061—
pos:11064EXIT‡e−$3.5M−13,825$3.5M$013,825—
pos:11116EXIT‡e−$1.2M−57,277$1.2M$057,277—
pos:11138EXIT‡e−$3.6M−49,951$3.6M$049,951—
pos:11358EXIT‡e−$807K−68,057$807K$068,057—
pos:11385EXIT‡e−$859K−25,835$859K$025,835—
pos:11386EXIT‡e−$1.7M−18,798$1.7M$018,798—
pos:11808EXIT‡e−$19.0M−765,694$19.0M$0765,694—
pos:11897EXIT‡e−$717K−5,698$717K$05,698—
pos:12108EXIT‡e−$1.5M−16,231$1.5M$016,231—
pos:12145EXIT‡e−$2.1M−52,076$2.1M$052,076—
pos:12340EXIT‡e−$406K−21,259$406K$021,259—
pos:12344EXIT‡e−$2.1M−12,099$2.1M$012,099—
pos:12366EXIT‡e−$1.4M−11,449$1.4M$011,449—
pos:12433EXIT‡e−$3.2M−18,392$3.2M$018,392—
pos:12474EXIT‡e−$3.4M−127,270$3.4M$0127,270—
pos:12487 PUTEXIT‡e−$29.5M−1,000,000$29.5M$01,000,000—
pos:12597EXIT‡e−$360K−2,199$360K$02,199—
pos:12603EXIT‡e−$3.2M−164,345$3.2M$0164,345—
pos:12608EXIT‡e−$1.0M−13,326$1.0M$013,326—
pos:12668 PRNEXIT‡e−$28.9M−25,255,000$28.9M$025,255,000—
pos:12682EXIT‡e−$410K−52,230$410K$052,230—
pos:13247EXIT‡e−$343K−1,352$343K$01,352—
pos:13364EXIT‡e−$4.0M−17,711$4.0M$017,711—
pos:13625EXIT‡e−$23.3M−710,626$23.3M$0710,626—
pos:13630EXIT‡e−$608K−33,987$608K$033,987—
pos:13858EXIT‡e−$33.8M−1,999,045$33.8M$01,999,045—
pos:13967EXIT‡e−$1.9M−27,629$1.9M$027,629—
pos:13982EXIT‡e−$2.1M−25,815$2.1M$025,815—
pos:14053EXIT‡e−$1.7M−11,000$1.7M$011,000—
pos:14095EXIT‡e−$2.4M−24,941$2.4M$024,941—
pos:14365EXIT‡e−$2.4M−20,909$2.4M$020,909—
pos:14474EXIT‡e−$1.1M−65,344$1.1M$065,344—
pos:14517EXIT‡e−$426K−8,693$426K$08,693—
pos:14734EXIT‡e−$2.1M−52,555$2.1M$052,555—
pos:14883EXIT‡e−$1.1M−5,098$1.1M$05,098—
pos:14932EXIT‡e−$12.9M−1,107,944$12.9M$01,107,944—
pos:15011EXIT‡e−$12.9K−733,333$12.9K$0733,333—
pos:15034EXIT‡e−$2.2M−32,943$2.2M$032,943—
pos:15057EXIT‡e−$2.9M−120,211$2.9M$0120,211—
pos:15220EXIT‡e−$1.2M−3,551$1.2M$03,551—
pos:15318EXIT‡e−$1.8M−8,985$1.8M$08,985—
pos:15409EXIT‡e−$10.9M−260,000$10.9M$0260,000—
pos:15492EXIT‡e−$2.5M−9,203$2.5M$09,203—
pos:15499EXIT‡e−$460K−2,014$460K$02,014—
pos:15574EXIT‡e−$55.0K−166,666$55.0K$0166,666—
pos:15824EXIT‡e−$545K−52,257$545K$052,257—
pos:15861EXIT‡e−$27.4M−354,000$27.4M$0354,000—
pos:16080EXIT‡e−$2.6M−936,309$2.6M$0936,309—
pos:16149EXIT‡e−$2.5M−66,438$2.5M$066,438—
pos:16221EXIT‡e−$4.3M−69,669$4.3M$069,669—
pos:16392EXIT‡e−$2.4M−10,104$2.4M$010,104—
pos:16398EXIT‡e−$999K−10,323$999K$010,323—
pos:16662EXIT‡e−$321K−11,996$321K$011,996—
pos:16711EXIT‡e−$2.7M−6,215$2.7M$06,215—
pos:16772EXIT‡e−$1.4M−16,606$1.4M$016,606—
pos:16788EXIT‡e−$266K−10,284$266K$010,284—
pos:16805EXIT‡e−$274K−483$274K$0483—
pos:17009EXIT‡e−$638K−7,786$638K$07,786—
pos:17136EXIT‡e−$2.3M−51,942$2.3M$051,942—
pos:17234EXIT‡e−$3.0M−10,616$3.0M$010,616—

Flags: no row carries a flag.

1–20 of the 100 changes on this page

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
position matched across quarters by exact reported CUSIP over a registry gap — producer-reconciled identity, never a name match identity_reconciled_by_cusipthe reported share count is unchanged across the pair; this build's data classified the change from its reported value; builds from 2026-09-10 on read it as NO CHANGE 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 (NEW / ADD / 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 stakederived by Public Filings from the published aggregate; NULL means the source did not disclose a usable value — never zeroreported unit changed across the pair (SH↔PRN); the share delta is withheld rather than fabricated shares_unit_mismatchPrev valueCurr valuePrev sharesCurr shares
position key pos:13206 · issuer key iss:1335 COMNO CHANGE+$32.1M0$1.7B$1.8B17,248,45017,248,450
position key pos:12458 · issuer key iss:324 NOTE 3.500%10/1 PRNNO CHANGE+$77.9M0$427M$505M306,885,000306,885,000
position key pos:17421 · issuer key iss:475 COMNO CHANGE+$26.9M0$321M$348M9,043,9039,043,903
position key pos:16040 · issuer key iss:1913 COMNO CHANGE+$21.4M0$252M$273M20,206,17020,206,170
position key pos:13502 · issuer key iss:1236 NOTE 4.000% 5/0 PRNNO CHANGE+$28.7M0$181M$209M70,000,00070,000,000
position key pos:10390 · issuer key iss:416 COMNO CHANGE+$24.7M0$171M$196M1,714,0001,714,000
position key pos:10784 · issuer key iss:324 COMNO CHANGE+$33.6M0$126M$159M11,637,03211,637,032
position key pos:11517 · issuer key iss:1003 COMNO CHANGE−$8.0M0$157M$149M1,979,6691,979,669
position key sid:sec:prov:426666fb8d43f8a6c202109e44eb876f · issuer key cusip6:00653Q COMMON STOCKNO CHANGE+$22.3M0$114M$137M11,477,73011,477,730
position key pos:12414 · issuer key iss:29 COMNO CHANGE+$41.6M0$64.1M$106M4,520,0004,520,000
position key pos:11370 · issuer key iss:1003 NOTE 1.750% 6/1 PRNNO CHANGE−$4.7M0$95.3M$90.6M60,000,00060,000,000
position key pos:14578 · issuer key iss:2296 COMNO CHANGE+$1.6M0$86.7M$88.3M3,126,0423,126,042
position key pos:13761 · issuer key iss:74 NOTE 4.250%11/1 PRNNO CHANGE−$6.7M0$92.6M$85.9M61,000,00061,000,000
position key sid:sec:prov:5fa73bae4b4007f19790df8489a7fcc7 · issuer key cusip6:23954D COMNO CHANGE+$45.1M0$34.7M$79.8M3,723,1313,723,131
position key sid:sec:prov:2bc6a25d40cf07124e3a03bdecf4a4df · issuer key cusip6:805111 COMNO CHANGE−$7.7M0$81.8M$74.1M13,569,00013,569,000
position key sid:sec:prov:7bf659316464fda9fc46729d980abb67 · issuer key cusip6:29332G COMNO CHANGE+$23.1M0$43.8M$66.9M4,747,7464,747,746
position key pos:13892 · issuer key iss:1286 NOTE 0.250% 1/1 PRNNO CHANGE+$2.0M0$64.7M$66.7M72,689,00072,689,000
position key pos:13965 · issuer key iss:264 CL ANO CHANGE−$5.5M0$68.5M$63.0M226,070226,070
position key pos:13781 · issuer key iss:1096 COMNO CHANGE+$7.7M0$55.1M$62.8M827,999827,999
position key pos:10399 · issuer key iss:1659 COMNO CHANGE−$27.2M0$87.4M$60.3M7,503,8127,503,812
position key sid:sec:prov:3fee4169345e05a49cf14bcc2babfc71 · issuer key cusip6:86150R COMNO CHANGE+$1.5M0$57.9M$59.4M1,823,5001,823,500
position key pos:12598 · issuer key iss:1082 COMNO CHANGE+$3.1M0$43.7M$46.7M561,170561,170
position key pos:14583 · issuer key iss:428 COMNO CHANGE−$24.3M0$68.8M$44.5M7,808,6057,808,605
position key pos:12072 · issuer key iss:310 COM NEWNO CHANGE−$17.4M0$61.2M$43.7M4,885,4464,885,446
position key sid:sec:prov:e40e4bba291a4c5e0e2b5429181fff16 · issuer key cusip6:53802L NOTE 2.500% 3/1 PRNNO CHANGE+$308K0$39.7M$40.0M34,280,00034,280,000
position key pos:10212 · issuer key iss:1665 COMNO CHANGE−$1.0M0$39.9M$38.9M970,590970,590
position key pos:12451 · issuer key iss:393 COMNO CHANGE−$3.2M0$41.3M$38.0M2,191,0002,191,000
position key sid:sec:prov:862b191ccb923fc424f39385b48ce4f8 · issuer key cusip6:86366E SPONSORED ADSNO CHANGE−$16.4M0$53.4M$37.0M767,993767,993
position key pos:17713 · issuer key iss:958 NOTE 2.500% 2/0 PRNNO CHANGE−$56.7K0$27.1M$27.0M30,000,00030,000,000
position key pos:14904 · issuer key iss:1899 COMNO CHANGE−$7.2M0$30.6M$23.4M726,000726,000
position key pos:15131 · issuer key iss:87 COMNO CHANGE−$4.5M0$27.0M$22.5M67,93567,935
position key sid:sec:prov:c5f3f37de4d48fd1b29c266e9a76eb0b · issuer key cusip6:20454B COMNO CHANGE−$288K0$19.4M$19.1M3,606,0003,606,000
position key sid:sec:prov:025f5bfc45d0f21f39b99aeb6192bfc1 · issuer key cusip6:501976 COMNO CHANGE−$1.5M0$18.8M$17.3M2,000,0002,000,000
position key pos:13793 · issuer key iss:1763 COM SHSNO CHANGE−$2.8M0$15.0M$12.2M2,722,1652,722,165
position key pos:16134 · issuer key iss:1362 COMNO CHANGE−$1.6M0$12.0M$10.3M3,360,0523,360,052
position key pos:12625 · issuer key iss:544 COMNO CHANGE+$1.5M0$4.0M$5.5M386,169386,169
position key sid:sec:prov:45f58e3bf467aafd3516eb30bc85b601 · issuer key cusip6:03589W COMNO CHANGE+$304K0$2.9M$3.2M583,913583,913
position key sid:sec:prov:1c7c81831d7de024bffc2474a53ee4b9 · issuer key cusip6:014442 COMNO CHANGE+$623K0$1.6M$2.3M1,055,1921,055,192
position key pos:13843 · issuer key iss:2294 *W EXP 99/99/999NO CHANGE−$275K0$2.1M$1.9M92,78792,787
position key pos:16440 · issuer key iss:637 COMNO CHANGE−$70.8K0$1.2M$1.1M13,70213,702
position key pos:10550 · issuer key iss:929 COMNO CHANGE−$75.9K0$235K$159K917917
position key pos:11320 · issuer key iss:1362 *W EXP 99/99/999NO CHANGE−$95.9K0$151K$54.8K1,250,0001,250,000
position key sid:sec:prov:caf6739f474e5aab1341e36d2fc446d1 · issuer key cusip6:74765K *W EXP 06/10/202NO CHANGE−$30.6K0$66.8K$36.2K333,333333,333
position key sid:sec:prov:325eed3e19d59a984be6eb2201e2d894 · issuer key cusip6:69353Y COMNO CHANGE−$880$11.0K$10.9K8,7908,790
position key sid:sec:prov:c4f97db1890f36f80c7a359d19822318 · issuer key cusip6:86889P *W EXP 08/01/203NO CHANGE−$6660$3.3K$2.7K166,666166,666
position key pos:15236 · issuer key iss:1264 COMNO CHANGE−$8330$3.1K$2.3K505505

Flags: no row carries a flag.

Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.
Truncated by Public Filings. Changes compare every position with a security identifier, new and exited included; holdings without one are counted, not compared. methodology §13F ↗

Reported positions — 2026-03-31

1–77 of 77 issuers · $8.5B disclosed value over 82 rows · 0 undisclosed-value rows
View
This build carries one quarter for this manager: 2026-03-31. Notable managers carry four published quarters, others two.
Positions DEERFIELD MANAGEMENT COMPANY, L.P. reported for the quarter ended 2026-03-31, as that filer reported them
This list carries reported issuer names and security identities, without a dated ticker mapping. Symbols are not inferred from names.a 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 filingShare of total reported value, calculated only when the full position list has disclosed values. This is 13F long value, not total assets.value undisclosed on the filing: retained and counted, excluded from sums, never shown as $0SharesWt
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)NUVALENT INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$1.8B17,248,45020.8%
verified 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
$665M—7.8%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$348M9,043,9034.1%
verified 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 · COM NEW CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$310M963,3513.7%
verified 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
$306M—3.6%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)VIATRIS INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$273M20,206,1703.2%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$271M457,0003.2%
verified 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
$239M—2.8%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$223M2,297,0002.6%
—MIRUM PHARMACEUTICALS INC · NOTE 4.000% 5/0 CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$209M70,000,000 PRN2.5%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CELCUITY INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$196M1,714,0002.3%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$194M5,917,0912.3%
—LARIMAR THERAPEUTICS INC · COM CUSIP 517125100
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$160M35,606,9741.9%
—VERA THERAPEUTICS INC · CL A CUSIP 92337R101
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$150M3,722,1001.8%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$143M15,038,0001.7%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$139M2,703,2381.6%
—LEGEND BIOTECH CORP · SPONSORED ADS CUSIP 52490G102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$139M7,687,6381.6%
verified 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 · COMMON STOCK CUSIP 00653Q102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$137M11,477,7301.6%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$106M4,520,0001.2%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$97.6M3,943,6001.2%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$94.4M3,097,7901.1%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$94.0M1,615,6961.1%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$88.3M3,126,0421.0%
—SYNDAX PHARMACEUTICALS INC · COM CUSIP 87164F105
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$88.3M3,779,9001.0%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$86.8M4,146,8131.0%
—ALIGNMENT HEALTHCARE INC · NOTE 4.250%11/1 CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$85.9M61,000,000 PRN1.0%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$85.6M1,019,8131.0%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)PFIZER INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$85.4M3,040,0001.0%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$80.4M610,0000.9%
—DAY ONE BIOPHARMACEUTICALS I · COM CUSIP 23954D109
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$79.8M3,723,1310.9%
—SAVARA INC · COM CUSIP 805111101
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$74.1M13,569,0000.9%
—ZENAS BIOPHARMA INC · NOTE 2.500% 4/0 CUSIP 98937LAA3
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$67.3M65,000,000 PRN0.8%
—ENHABIT INC · COM CUSIP 29332G102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$66.9M4,747,7460.8%
—NEOGENOMICS INC · NOTE 0.250% 1/1 CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$66.7M72,689,000 PRN0.8%
verified 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 · SPONSORED ADS CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$66.1M2,462,0000.8%
verified 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 · CL A CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$63.0M226,0700.7%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$62.8M827,9990.7%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$60.3M7,503,8120.7%
—STOKE THERAPEUTICS INC · COM CUSIP 86150R107
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$59.4M1,823,5000.7%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$56.1M2,210,1000.7%
—IDEAYA BIOSCIENCES INC · COM CUSIP 45166A102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$51.0M1,530,0080.6%
—BELITE BIO INC · SPONSORED ADS CUSIP 07782B104
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$48.5M304,0130.6%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$48.1M851,5560.6%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$46.7M561,1700.6%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CERTARA INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$44.5M7,808,6050.5%
verified 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 · COM NEW CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$43.7M4,885,4460.5%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$42.0M657,0000.5%
—LIVANOVA PLC · NOTE 2.500% 3/1 CUSIP 53802LAB8
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$40.0M34,280,000 PRN0.5%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$38.9M970,5900.5%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)CAREDX INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$38.0M2,191,0000.4%
—STRUCTURE THERAPEUTICS INC · SPONSORED ADS CUSIP 86366E106
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$37.0M767,9930.4%
—IMMUNOCORE HLDGS PLC · NOTE 2.500% 2/0 CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$27.0M30,000,000 PRN0.3%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)VERACYTE INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$23.4M726,0000.3%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$22.5M67,9350.3%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)EMBECTA CORP · COMMON STOCK CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$22.4M2,534,9610.3%
—TYRA BIOSCIENCES INC · COM CUSIP 90240B106
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$21.0M549,0000.2%
—FOGHORN THERAPEUTICS INC · COM CUSIP 344174107
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$21.0M4,394,3670.2%
—BRIGHT MINDS BIOSCIENCES INC · COM NEW CUSIP 10919W405
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$20.7M283,0000.2%
—COMPASS THERAPEUTICS INC · COM CUSIP 20454B104
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$19.1M3,606,0000.2%
—MONOPAR THERAPEUTICS INC · COM NEW CUSIP 61023L207
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$17.7M323,7450.2%
—KYVERNA THERAPEUTICS INC · COM CUSIP 501976104
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$17.3M2,000,0000.2%
—SPYGLASS PHARMA INC · COM SHS CUSIP 85220G109
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$14.3M550,0000.2%
—BETA BIONICS INC · COM CUSIP 08659B102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$13.3M1,324,0000.2%
verified 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 · 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
ticker not yet mapped
$10.4M4,610,0520.1%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$5.5M386,1690.1%
—ANNEXON INC · COM CUSIP 03589W102
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$3.2M583,9130.0%
—ALECTOR INC · COM CUSIP 014442107
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$2.3M1,055,1920.0%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$1.1M13,7020.0%
—BIOMX INC · COM NEW CUSIP 09090D509
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$493K131,2720.0%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)VERADERMICS INC · COMMON STOCK CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$316K5,0000.0%
verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred)HUMANA INC · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$159K9170.0%
—QUANTUM SI INC · *W EXP 06/10/202 CUSIP 74765K113
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$36.2K333,3330.0%
—PMV PHARMACEUTICALS INC · COM CUSIP 69353Y103
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$10.9K8,7900.0%
—SURROZEN INC · *W EXP 08/01/203 CUSIP 86889P117
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
ticker not yet mapped
$2.7K166,6660.0%
verified 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 · COM CUSIP —
quarter ended 2026-03-31 filed filed 2026-05-15 +45d
$2.3K5050.0%

1–20 of 77 issuers

Change kind and share change are in Position changes above; Congress overlap is planned.

1–77 of 77 issuers · page 1 of 1
One line per issuer, largest first; a row with no issuer key stands on its own line. Open a line for its rows as this filer reported them. The list holds every row this filer reported for the quarter. Issuer totals on the holders pages count each manager's own report once; that never removes a row here. how positions are grouped ↗

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.

holdings whose <value> did not parse — retained and counted, never zero-filled: 0 · share of the period's disclosed value held in the top-N positions; denominator is reported 13F value, not total assets: 74.4% · integer Herfindahl–Hirschman index in basis points over disclosed position values: 602 · 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, each position as this filer reported it; where the page cannot embed every reported row, the list says how many it leaves out. This block is provenance, not a substitute: the filing itself is the record, and it is one click away. Public Filings decided on 2026-08-01 to serve this list from its published build; filings newer than this build are on EDGAR.

Open DEERFIELD MANAGEMENT COMPANY, L.P.'s 13F filings on SEC EDGAR ↗
Notes on this data

Quarter-end holdings as filed

Explore the full published position list and its source filing. This record excludes the manager’s cash, shorts and non-13(f) assets.

Compare consecutive quarters

Position changes retain the producer’s classification and comparability flags. Share counts and reported values describe different changes.

A snapshot, not current holdings

Use the quarter selector to inspect available periods. Unknown values stay unknown and each table states its coverage.

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).