Vault-13

ARCELLX INC ACLX

COMMON STOCK · Common Stock · CUSIP 03940C100

184 institutional holders +26 vs Q4 2023
50,193,97050.2m shares reported held*
$3.5bnreported value*
39 new 69 added 58 reduced 15 sold out net bought ≈ $76.6m (+1.1m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($6.4m this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $69.53. Options: 4 managers hold calls ($5.5m notional), 7 hold puts ($13.1m).

Trends to Q1 2024

Institutional holders

Managers reporting a position, each quarter

0100200Q3 22: 74Q4 22: 127Q1 23: 119Q2 23: 140Q3 23: 138Q4 23: 158Q1 24: 184184Q3 22Q1 23Q3 23Q1 24
Numbers
QuarterHolders
Q3 202274
Q4 2022127
Q1 2023119
Q2 2023140
Q3 2023138
Q4 2023158
Q1 2024184

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
2000200Q4 22: 86 bought or addedQ4 22: 32 cut or sold outQ4 22Q1 23: 61 bought or addedQ1 23: 63 cut or sold outQ1 23Q2 23: 99 bought or addedQ2 23: 44 cut or sold outQ2 23Q3 23: 75 bought or addedQ3 23: 57 cut or sold outQ3 23Q4 23: 85 bought or addedQ4 23: 64 cut or sold outQ4 23Q1 24: 108 bought or addedQ1 24: 73 cut or sold outQ1 24
Numbers
QuarterBought or addedCut or sold out
Q4 20228632
Q1 20236163
Q2 20239944
Q3 20237557
Q4 20238564
Q1 202410873

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$10m$20m$30mQ2 23 calls: $1.0mQ2 23 puts: $1.7mQ2 23P/C 1.68Q3 23 calls: $846.8kQ3 23 puts: $190.2kQ3 23P/C 0.22Q4 23 calls: $22.5mQ4 23 puts: $8.7mQ4 23P/C 0.38Q1 24 calls: $5.5mQ1 24 puts: $13.1mQ1 24P/C 2.36
Numbers
QuarterCallsPutsP/C
Q2 2023$1.0m$1.7m1.68
Q3 2023$846.8k$190.2k0.22
Q4 2023$22.5m$8.7m0.38
Q1 2024$5.5m$13.1m2.36

Biggest buyers

FMR LLC Added +1,015,326+1.0m
MORGAN STANLEY Added +743,716+743.7k
DEUTSCHE BANK AG\ Added +308,596+308.6k
VOYA INVESTMENT MANAGEMENT LLC Added +301,086+301.1k
GREAT POINT PARTNERS LLC Added +251,736+251.7k
EAGLE ASSET MANAGEMENT INC New +224,534+224.5k
BANK OF AMERICA CORP /DE/ Added +220,254+220.3k
Cutter Capital Management, LP New +214,000+214.0k
BAMCO INC /NY/ Added +185,493+185.5k
VANGUARD GROUP INC Added +167,037+167.0k

Biggest sellers

MONTANOVA CAPITAL, LLC Reduced -873,620-873.6k
SR One Capital Management, LP Reduced -800,000-800.0k
Deep Track Capital, LP Sold out -725,145-725.1k
PERCEPTIVE ADVISORS LLC Reduced -611,253-611.3k
STEMPOINT CAPITAL LP Reduced -173,337-173.3k
CAAS CAPITAL MANAGEMENT LP Sold out -124,959-125.0k
JPMORGAN CHASE & CO Reduced -100,326-100.3k
Nuveen Asset Management, LLC Reduced -92,843-92.8k
BARCLAYS PLC Reduced -89,723-89.7k
GOLDMAN SACHS GROUP INC Reduced -82,900-82.9k

Biggest calls

SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $4.2m60.2k shares
CITADEL ADVISORS LLC Reduced $945.9k13.6k shares
SIMPLEX TRADING, LLC Reduced $417.0k6.0k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Biggest puts

SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $8.0m114.8k shares
CITADEL ADVISORS LLC Added $2.2m31.0k shares
JANE STREET GROUP, LLC Reduced $1.6m23.0k shares
SIMPLEX TRADING, LLC Reduced $1.1m15.9k shares
STEMPOINT CAPITAL LP New $135.0k50.0k shares
GROUP ONE TRADING LLC Added $111.3k1.6k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
GILEAD SCIENCES, INC. 13D · may seek influence +88.5 pts · filed 2026-04-28
Stated purposeItem 4 of the Original Schedule 13D is amended to include the following at the end thereof: "As previously disclosed, Gilead, Purchaser and Arcellx entered into the Merger Agreement pursuant to which Purchaser commenced the Offer on March 6, 2026. The Offer expired at 5:00 p.m., Eastern Time, on April 27, 2026. Computershare Trust Company N.A., the depositary and paying agent for the Offer, advised Gilead that, as of the expiration of the Offer, 38,795,604 Shares had been validly tendered and not validly withdrawn pursuant to the Offer, representing, together with Shares already owned by Gilead, approximately 77.2% of the Shares outstanding as of the expiration of the Offer. Following consummation of the Offer, on April 28, 2026, Gilead completed its acquisition of Arcellx through the m… Full filing
 100.0% +88.5 pts 100 2026-04-28
BlackRock, Inc. 13G · institution filed 2025-04-17 6.4% 3.5m 2025-04-17

Fell to 5% or below in the last year: Paradigm Biocapital Advisors LP (0.0%, 2026-08-14), Vestal Point Capital, LP (0.0%, 2026-05-15), New Enterprise Associates 15, L.P. (0.0%, 2026-04-30), Elghandour Rami (0.0%, 2026-04-28), VANGUARD GROUP INC (0.0%, 2026-03-26), T. Rowe Price Investment Management, Inc. (4.5%, 2026-03-06), FMR LLC (0.5%, 2026-03-06), RA CAPITAL MANAGEMENT, L.P. (2.2%, 2026-02-17)

Holders, Q1 2024

#ManagerLocationShares Value% of their portfolioChangeShares change
1 FMR LLC 0.03% of their portfolio BOSTON, MA 5,394,4955.4m $375.2m $375.2m 0.03% Added +1.0m +1,015,326
2 PERCEPTIVE ADVISORS LLC 4.82% of their portfolio NEW YORK, NY 3,933,5563.9m $273.6m $273.6m 4.82% Reduced -611.3k -611,253
3 Paradigm Biocapital Advisors LP 9.35% of their portfolio NEW YORK, NY 3,818,0953.8m $265.5m $265.5m 9.35% Added +159.5k +159,471
4 NEA Management Company, LLC 16.17% of their portfolio TIMONIUM, MD 3,745,2623.7m $260.5m $260.5m 16.17% Unchanged
5 BlackRock Inc. 0.00% of their portfolio New York, NY 3,066,0683.1m $213.2m $213.2m 0.00% Added +47.5k +47,530
6 LORD, ABBETT & CO. LLC 0.27% of their portfolio JERSEY CITY, NJ 2,396,2342.4m $166.7m $166.7m 0.27% Added +3.1k +3,100
7 SR One Capital Management, LP 44.83% of their portfolio Redwood City, CA 2,346,6302.3m $163.2m $163.2m 44.83% Reduced -800.0k -800,000
8 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 2,228,8562.2m $155.0m $155.0m 0.00% Added +167.0k +167,037
9 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 2,090,2862.1m $145.4m $145.4m 0.00% Added +743.7k +743,716
10 STATE STREET CORP 0.01% of their portfolio BOSTON, MA 1,885,1181.9m $131.1m $131.1m 0.01% Added +111.3k +111,279
11 Cormorant Asset Management, LP 5.45% of their portfolio BOSTON, MA 1,780,0001.8m $123.8m $123.8m 5.45% Added +80.0k +80,000
12 MONTANOVA CAPITAL, LLC 4.58% of their portfolio New York, NY 1,562,3541.6m $108.7m $108.7m 4.58% Reduced -873.6k -873,620
13 JANUS HENDERSON GROUP PLC 0.06% of their portfolio LONDON, X0 1,522,3091.5m $105.9m $105.9m 0.06% Reduced -15.9k -15,901
14 PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio BALTIMORE, MD 1,344,5531.3m $93.5m $93.5m 0.01% Added +84.4k +84,373
15 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 1,103,5001.1m $76.7m $76.7m 0.00% Reduced -100.3k -100,326
16 T. Rowe Price Investment Management, Inc. 0.04% of their portfolio BALTIMORE, MD 982,862982.9k $68.4m $68.4m 0.04% Added +60.5k +60,463
17 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 838,469838.5k $58.3m $58.3m 0.01% Added +53.1k +53,067
18 SAMSARA BIOCAPITAL, LLC 4.88% of their portfolio PALO ALTO, CA 453,641453.6k $31.6m $31.6m 4.88% Reduced -6.8k -6,800
19 DEUTSCHE BANK AG\ 0.01% of their portfolio FRANKFURT AM MAIN, 2M 447,783447.8k $31.1m $31.1m 0.01% Added +308.6k +308,596
20 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 414,541414.5k $28.8m $28.8m 0.00% Added +220.3k +220,254
21 VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio ATLANTA, GA 382,558382.6k $26.6m $26.6m 0.03% Added +301.1k +301,086
22 VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.09% of their portfolio JUPITER, FL 363,093363.1k $25.3m $25.3m 0.09% Added +127.3k +127,333
23 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 359,460359.5k $25.0m $25.0m 0.00% Reduced -4.0k -3,961
24 PFM Health Sciences, LP 1.05% of their portfolio SAN FRANCISCO, CA 303,210303.2k $21.1m $21.1m 1.05% Reduced -32.0k -31,988
25 GREAT POINT PARTNERS LLC 3.25% of their portfolio Greenwich, CT 300,000300.0k $20.9m $20.9m 3.25% Added +251.7k +251,736
26 Affinity Asset Advisors, LLC 3.39% of their portfolio NEW YORK, NY 300,000300.0k $20.9m $20.9m 3.39% Reduced -40.0k -40,000
27 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 282,010282.0k $19.6m $19.6m 0.00% Added +17.8k +17,832
28 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 272,793272.8k $19.0m $19.0m 0.00% Reduced -82.9k -82,900
29 ADAGE CAPITAL PARTNERS GP, L.L.C. 0.04% of their portfolio Boston, MA 272,009272.0k $18.9m $18.9m 0.04% Reduced -60.9k -60,895
30 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio NEW YORK, NY 265,410265.4k $18.5m $18.5m 0.01% Added +135.3k +135,274
31 Integral Health Asset Management, LLC 1.74% of their portfolio New York, NY 255,000255.0k $17.7m $17.7m 1.74% Added +95.0k +95,000
32 BAMCO INC /NY/ 0.05% of their portfolio NEW YORK, NY 248,993249.0k $17.3m $17.3m 0.05% Added +185.5k +185,493
33 VICTORY CAPITAL MANAGEMENT INC 0.02% of their portfolio San Antonio, TX 235,866235.9k $16.4m $16.4m 0.02% Added +80.2k +80,214
34 FEDERATED HERMES, INC. 0.04% of their portfolio PITTSBURGH, PA 231,661231.7k $16.1m $16.1m 0.04% Added +17.1k +17,062
35 EAGLE ASSET MANAGEMENT INC 0.08% of their portfolio ST PETERSBURG, FL 224,534224.5k $15.0m $15.0m 0.08% New
36 Candriam S.C.A. 0.10% of their portfolio STRASSEN, N4 220,008220.0k $15.3m $15.3m 0.10% Reduced -62.0k -62,005
37 Cutter Capital Management, LP 2.87% of their portfolio NEW YORK, NY 214,000214.0k $14.9m $14.9m 2.87% New
38 Russell Investments Group, Ltd. 0.02% of their portfolio Seattle, WA 195,437195.4k $13.6m $13.6m 0.02% Added +5.9k +5,895
39 TWO SIGMA INVESTMENTS, LP 0.03% of their portfolio NEW YORK, NY 188,854188.9k $13.1m $13.1m 0.03% Added +43.6k +43,580
40 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 186,783186.8k $13.0m $13.0m 0.00% Reduced -92.8k -92,843
41 Parkman Healthcare Partners LLC 1.34% of their portfolio STAMFORD, CT 156,598156.6k $10.9m $10.9m 1.34% Reduced -11.7k -11,664
42 Soleus Capital Management, L.P. 0.92% of their portfolio GREENWICH, CT 150,000150.0k $10.4m $10.4m 0.92% Reduced -9.0k -9,000
43 STEMPOINT CAPITAL LP 2.61% of their portfolio NEW YORK, NY 140,267140.3k $9.8m $9.8m 2.61% Reduced -173.3k -173,337
44 Rafferty Asset Management, LLC 0.03% of their portfolio New York, NY 126,751126.8k $8.8m $8.8m 0.03% Added +14.8k +14,799
45 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 121,064121.1k $8.4m $8.4m 0.00% Reduced -10.9k -10,870
46 Squarepoint Ops LLC 0.03% of their portfolio NEW YORK, NY 121,011121.0k $8.4m $8.4m 0.03% Reduced -8.1k -8,145
47 CITIGROUP INC 0.01% of their portfolio NEW YORK, NY 114,947114.9k $8.0m $8.0m 0.01% Added +62.6k +62,616
48 Woodline Partners LP 0.07% of their portfolio San Francisco, CA 104,060104.1k $7.2m $7.2m 0.07% Unchanged
49 UBS Group AG 0.00% of their portfolio ZURICH, V8 103,481103.5k $7.2m $7.2m 0.00% Added +6.4k +6,436
50 Qube Research & Technologies Ltd 0.01% of their portfolio LONDON, X0 101,186101.2k $7.0m $7.0m 0.01% Added +87.3k +87,261
51 Vestal Point Capital, LP 0.58% of their portfolio NEW YORK, NY 100,000100.0k $7.0m $7.0m 0.58% Added +40.0k +40,000
52 Walleye Capital LLC 0.07% of their portfolio NEW YORK, NY 94,20894.2k $6.6m $6.6m 0.07% Reduced -24.1k -24,127
53 TD Asset Management Inc 0.01% of their portfolio Toronto, A6 89,91889.9k $6.3m $6.3m 0.01% Added +8.6k +8,600
54 CITADEL ADVISORS LLC 0.01% of their portfolio MIAMI, FL 77,73077.7k $5.4m $5.4m 0.01% Added +54.5k +54,534
55 Duquesne Family Office LLC 0.14% of their portfolio New York, NY 74,10074.1k $5.2m $5.2m 0.14% New
56 HighVista Strategies LLC 1.79% of their portfolio BOSTON, MA 72,23072.2k $5.0m $5.0m 1.79% Unchanged
57 Thrivent Financial for Lutherans 0.01% of their portfolio Minneapolis, MN 67,54067.5k $4.7m $4.7m 0.01% New
58 Informed Momentum Co LLC 0.72% of their portfolio SOLANA BEACH, CA 66,05266.1k $4.6m $4.6m 0.72% Added +1.0k +1,000
59 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 61,21061.2k $4.3m $4.3m 0.00% Added +3.8k +3,836
60 Cubist Systematic Strategies, LLC 0.05% of their portfolio STAMFORD, CT 57,24857.2k $4.0m $4.0m 0.05% Reduced -69.8k -69,810
61 Swiss National Bank 0.00% of their portfolio ZURICH, V8 56,40056.4k $3.9m $3.9m 0.00% Reduced -800 -800
62 FRANKLIN RESOURCES INC 0.00% of their portfolio San Mateo, CA 54,33854.3k $3.8m $3.8m 0.00% Added +36.1k +36,095
63 RHUMBLINE ADVISERS 0.00% of their portfolio BOSTON, MA 53,00253.0k $3.7m $3.7m 0.00% Added +1.6k +1,567
64 Schonfeld Strategic Advisors LLC 0.03% of their portfolio NEW YORK, NY 52,92452.9k $3.7m $3.7m 0.03% Added +12.4k +12,414
65 TWO SIGMA ADVISERS, LP 0.01% of their portfolio NEW YORK, NY 48,40048.4k $3.4m $3.4m 0.01% Added +40.6k +40,600
66 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 47,19847.2k $3.3m $3.3m 0.00% Added +1.7k +1,747
67 Connor, Clark & Lunn Investment Management Ltd. 0.01% of their portfolio VANCOUVER, A1 45,69845.7k $3.2m $3.2m 0.01% Added +8.7k +8,716
68 FIRST TRUST ADVISORS LP 0.00% of their portfolio Wheaton, IL 40,27740.3k $2.8m $2.8m 0.00% Added +14.8k +14,772
69 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 39,70339.7k $2.8m $2.8m 0.00% Reduced -89.7k -89,723
70 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 39,58039.6k $2.8m $2.8m 0.00% Added +2.6k +2,580
71 CREDIT SUISSE AG/ 0.00% of their portfolio ZURICH, V8 38,73938.7k $2.7m $2.7m 0.00% Added +1.6k +1,556
72 ALPS ADVISORS INC 0.02% of their portfolio Denver, CO 37,23537.2k $2.6m $2.6m 0.02% Added +4.8k +4,833
73 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 36,85736.9k $2.6m $2.6m 0.00% Reduced -47.5k -47,534
74 PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio DES MOINES, IA 36,83536.8k $2.6m $2.6m 0.00% Added +26.2k +26,197
75 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 36,57536.6k $2.5m $2.5m 0.00% Added +13.5k +13,494
76 MYDA Advisors LLC 0.85% of their portfolio WOODMERE, NY 35,00035.0k $2.4m $2.4m 0.85% Reduced -5.0k -5,000
77 ACUTA CAPITAL PARTNERS, LLC 1.56% of their portfolio REDWOOD CITY, CA 34,50034.5k $2.4m $2.4m 1.56% Reduced -42.5k -42,500
78 TWINBEECH CAPITAL LP 0.04% of their portfolio PURCHASE, NY 30,44430.4k $2.1m $2.1m 0.04% Reduced -33.0k -33,020
79 DekaBank Deutsche Girozentrale 0.00% of their portfolio FRANKFURT, 2M 30,00030.0k $2.1m $2.1m 0.00% Unchanged
80 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio WEST SACRAMENTO, CA 29,54829.5k $2.1m $2.1m 0.00% Reduced -2.6k -2,610
81 Legal & General Group Plc 0.00% of their portfolio London, X0 29,34429.3k $2.0m $2.0m 0.00% Reduced -418 -418
82 ALGERT GLOBAL LLC 0.08% of their portfolio SAN FRANCISCO, CA 28,31028.3k $2.0m $2.0m 0.08% Added +19.1k +19,120
83 STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio MADISON, WI 26,62626.6k $1.9m $1.9m 0.00% Reduced -4.8k -4,755
84 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 25,28625.3k $1.8m $1.8m 0.00% Reduced -41.8k -41,788
85 CONGRESS ASSET MANAGEMENT CO 0.01% of their portfolio BOSTON, MA 23,22823.2k $1.6m $1.6m 0.01% Reduced -1.8k -1,831
86 MARTINGALE ASSET MANAGEMENT L P 0.03% of their portfolio BOSTON, MA 22,93222.9k $1.6m $1.6m 0.03% Reduced -4.2k -4,202
87 FORA Capital, LLC 0.13% of their portfolio MIAMI, FL 22,21722.2k $1.5m $1.5m 0.13% Unchanged
88 Erste Asset Management GmbH 0.02% of their portfolio VIENNA, C4 21,00021.0k $1.5m $1.5m 0.02% New
89 Moody Aldrich Partners LLC 0.24% of their portfolio MARBLEHEAD, MA 20,56020.6k $1.4m $1.4m 0.24% New
90 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 20,22320.2k $1.4m $1.4m 0.00% Reduced -4.8k -4,771
91 PROFUND ADVISORS LLC 0.05% of their portfolio BETHESDA, MD 20,03320.0k $1.4m $1.4m 0.05% Added +1.4k +1,436
92 Allianz Asset Management GmbH 0.00% of their portfolio MUNICH, 2M 19,90019.9k $1.4m $1.4m 0.00% Added +4.1k +4,100
93 MetLife Investment Management, LLC 0.01% of their portfolio Whippany, NJ 19,59419.6k $1.4m $1.4m 0.01% Reduced -590 -590
94 AMERICAN INTERNATIONAL GROUP, INC. 0.00% of their portfolio New York, NY 18,90418.9k $1.3m $1.3m 0.00% Reduced -162 -162
95 HARBOR CAPITAL ADVISORS, INC. 0.17% of their portfolio CHICAGO, IL 18,79418.8k $1.3m $1.3m 0.17% New
96 Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio SEOUL, M5 18,62918.6k $775.6k $775.6k 0.00% Reduced -3.7k -3,738
97 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 17,83417.8k $1.2m $1.2m 0.00% Added +7.3k +7,319
98 Atle Fund Management AB 0.74% of their portfolio STOCKHOLM, V7 17,49617.5k $1.2m $1.2m 0.74% Added +6.1k +6,096
99 SEVEN EIGHT CAPITAL, LP 0.13% of their portfolio New York, NY 17,35117.4k $1.2m $1.2m 0.13% New
100 NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio ALBANY, NY 16,97517.0k $1.2m $1.2m 0.00% Added +1.5k +1,537