Vault-13

ARCELLX INC ACLX

COMMON STOCK · Common Stock · CUSIP 03940C100

127 institutional holders +53 vs Q3 2022
42,406,62942.4m shares reported held*
$1.3bnreported value*
52 new 34 added 29 reduced 3 sold out net bought ≈ $26.5m (+855.9k 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 ($514.1k this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $30.98. Options: 4 managers hold calls ($1.5m notional), 3 hold puts ($331.1k).

Trends to Q4 2022

Institutional holders

Managers reporting a position, each quarter

050100150Q3 22: 74Q4 22: 127127Q3 22Q4 22
Numbers
QuarterHolders
Q3 202274
Q4 2022127

Calls vs puts

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

CallsPuts
$0$500k$1m$1.5mQ3 22 calls: $681.0kQ3 22 puts: $187.0kQ3 22P/C 0.27Q4 22 calls: $1.5mQ4 22 puts: $331.1kQ4 22P/C 0.22
Numbers
QuarterCallsPutsP/C
Q3 2022$681.0k$187.0k0.27
Q4 2022$1.5m$331.1k0.22

Biggest buyers

PICTET ASSET MANAGEMENT SA New +895,209+895.2k
Paradigm Biocapital Advisors LP New +882,101+882.1k
PFM Health Sciences, LP New +616,515+616.5k
Commodore Capital LP New +591,437+591.4k
JPMORGAN CHASE & CO Added +590,980+591.0k
FMR LLC Added +504,932+504.9k
LORD, ABBETT & CO. LLC Added +454,838+454.8k
BlackRock Inc. Added +401,076+401.1k
Candriam S.C.A. Added +388,931+388.9k
VANGUARD GROUP INC Added +251,467+251.5k

Biggest sellers

NEA Management Company, LLC Reduced -2,005,002-2.0m
NOVO HOLDINGS A/S Reduced -1,707,858-1.7m
Cormorant Asset Management, LP Reduced -974,173-974.2k
JANUS HENDERSON GROUP PLC Reduced -652,071-652.1k
CLOUGH CAPITAL PARTNERS L P Reduced -516,855-516.9k
UBS Group AG Reduced -184,236-184.2k
TimesSquare Capital Management, LLC Reduced -162,100-162.1k
Soleus Capital Management, L.P. Reduced -137,466-137.5k
Point72 Asset Management, L.P. Sold out -132,667-132.7k
Balyasny Asset Management L.P. Reduced -112,281-112.3k

Biggest calls

CITADEL ADVISORS LLC Added $759.0k24.5k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $635.1k20.5k shares
SIMPLEX TRADING, LLC Reduced $89.0k2.9k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Biggest puts

CITADEL ADVISORS LLC New $319.1k10.3k shares
SIMPLEX TRADING, LLC Reduced $12.0k400 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, Q4 2022

#ManagerLocationShares Value% of their portfolioChangeShares change
1 SR One Capital Management, LP 62.20% of their portfolio Redwood City, CA 5,500,0075.5m $170.4m $170.4m 62.20% Unchanged
2 NEA Management Company, LLC 8.26% of their portfolio TIMONIUM, MD 4,745,2624.7m $147.0m $147.0m 8.26% Reduced -2.0m -2,005,002
3 PERCEPTIVE ADVISORS LLC 2.32% of their portfolio NEW YORK, NY 2,598,3052.6m $80.5m $80.5m 2.32% Added +132.9k +132,900
4 MONTANOVA CAPITAL, LLC 3.06% of their portfolio New York, NY 2,350,3332.4m $72.8m $72.8m 3.06% Added +100.8k +100,800
5 BlackRock Inc. 0.00% of their portfolio New York, NY 2,207,1792.2m $68.4m $68.4m 0.00% Added +401.1k +401,076
6 Cormorant Asset Management, LP 4.32% of their portfolio BOSTON, MA 2,075,0002.1m $64.3m $64.3m 4.32% Reduced -974.2k -974,173
7 CITADEL ADVISORS LLC 0.06% of their portfolio MIAMI, FL 1,695,8061.7m $52.5m $52.5m 0.06% Reduced -50.2k -50,164
8 JANUS HENDERSON GROUP PLC 0.04% of their portfolio LONDON, X0 1,672,1471.7m $51.8m $51.8m 0.04% Reduced -652.1k -652,071
9 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 1,616,0911.6m $50.1m $50.1m 0.00% Added +102.1k +102,066
10 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 1,486,8541.5m $46.1m $46.1m 0.00% Added +251.5k +251,467
11 NOVO HOLDINGS A/S 2.87% of their portfolio HELLERUP, G7 1,484,0201.5m $46.0m $46.0m 2.87% Reduced -1.7m -1,707,858
12 FMR LLC 0.00% of their portfolio BOSTON, MA 1,293,6001.3m $40.1m $40.1m 0.00% Added +504.9k +504,932
13 Soleus Capital Management, L.P. 4.90% of their portfolio GREENWICH, CT 1,102,4471.1m $34.2m $34.2m 4.90% Reduced -137.5k -137,466
14 LORD, ABBETT & CO. LLC 0.06% of their portfolio JERSEY CITY, NJ 1,096,9941.1m $34.0m $34.0m 0.06% Added +454.8k +454,838
15 SAMSARA BIOCAPITAL, LLC 6.39% of their portfolio PALO ALTO, CA 957,451957.5k $29.7m $29.7m 6.39% Reduced -106.4k -106,384
16 PICTET ASSET MANAGEMENT SA 0.04% of their portfolio GENEVA 73, V8 895,209895.2k $27.7m $27.7m 0.04% New
17 Paradigm Biocapital Advisors LP 3.21% of their portfolio NEW YORK, NY 882,101882.1k $27.3m $27.3m 3.21% New
18 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 743,998744.0k $23.0m $23.0m 0.00% Added +591.0k +590,980
19 PFM Health Sciences, LP 0.81% of their portfolio SAN FRANCISCO, CA 616,515616.5k $19.1m $19.1m 0.81% New
20 Commodore Capital LP 2.76% of their portfolio NEW YORK, NY 591,437591.4k $18.3m $18.3m 2.76% New
21 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 544,770544.8k $16.9m $16.9m 0.00% Added +20.2k +20,177
22 ADAGE CAPITAL PARTNERS GP, L.L.C. 0.03% of their portfolio Boston, MA 426,904426.9k $13.2m $13.2m 0.03% Reduced -100.0k -100,000
23 Candriam S.C.A. 0.09% of their portfolio STRASSEN, N4 422,154422.2k $13.1m $13.1m 0.09% Added +388.9k +388,931
24 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 276,978277.0k $8.6m $8.6m 0.00% Added +21.6k +21,622
25 Balyasny Asset Management L.P. 0.03% of their portfolio Chicago, IL 250,477250.5k $7.8m $7.8m 0.03% Reduced -112.3k -112,281
26 Affinity Asset Advisors, LLC 3.41% of their portfolio NEW YORK, NY 240,143240.1k $7.4m $7.4m 3.41% Added +30.0k +30,005
27 SPHERA FUNDS MANAGEMENT LTD. 2.31% of their portfolio TEL AVIV, L3 237,488237.5k $7.4m $7.4m 2.31% Reduced -96.6k -96,592
28 CLOUGH CAPITAL PARTNERS L P 0.74% of their portfolio Boston, MA 236,978237.0k $7.3m $7.3m 0.74% Reduced -516.9k -516,855
29 TimesSquare Capital Management, LLC 0.10% of their portfolio NEW YORK, NY 218,910218.9k $6.8m $6.8m 0.10% Reduced -162.1k -162,100
30 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 207,674207.7k $6.4m $6.4m 0.00% Added +4.8k +4,835
31 PATHWAY CAPITAL MANAGEMENT, LP 10.46% of their portfolio Irvine, CA 189,120189.1k $5.9m $5.9m 10.46% New
32 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 164,804164.8k $5.1m $5.1m 0.01% Added +153.1k +153,131
33 TWO SIGMA INVESTMENTS, LP 0.02% of their portfolio NEW YORK, NY 155,006155.0k $4.8m $4.8m 0.02% New
34 Altium Capital Management LLC 2.38% of their portfolio NEW YORK, NY 150,000150.0k $4.6m $4.6m 2.38% Added +35.0k +35,000
35 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 131,165131.2k $4.1m $4.1m 0.00% Added +10.5k +10,528
36 CAAS CAPITAL MANAGEMENT LP 0.77% of their portfolio NEW YORK, NY 129,959130.0k $4.0m $4.0m 0.77% New
37 Informed Momentum Co LLC 0.82% of their portfolio SOLANA BEACH, CA 128,525128.5k $4.0m $4.0m 0.82% Reduced -761 -761
38 NORGES BANK 0.00% of their portfolio OSLO, Q8 123,600123.6k $3.8m $3.8m 0.00% Not comparable
39 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 123,495123.5k $3.8m $3.8m 0.00% Added +26.8k +26,790
40 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 122,117122.1k $3.8m $3.8m 0.00% Added +33.9k +33,938
41 Parkman Healthcare Partners LLC 1.00% of their portfolio STAMFORD, CT 121,093121.1k $3.8m $3.8m 1.00% Reduced -18.8k -18,782
42 VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio ATLANTA, GA 112,841112.8k $3.5m $3.5m 0.00% Added +58.2k +58,220
43 TEACHER RETIREMENT SYSTEM OF TEXAS 0.03% of their portfolio AUSTIN, TX 112,107112.1k $3.5m $3.5m 0.03% New
44 Rafferty Asset Management, LLC 0.03% of their portfolio New York, NY 110,218110.2k $3.4m $3.4m 0.03% Added +17.8k +17,765
45 VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.02% of their portfolio JUPITER, FL 100,678100.7k $3.1m $3.1m 0.02% New
46 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 93,46993.5k $2.9m $2.9m 0.00% New
47 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 89,80389.8k $2.8m $2.8m 0.00% Reduced -14.3k -14,315
48 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 80,36780.4k $2.5m $2.5m 0.00% Reduced -14.2k -14,211
49 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 78,72578.7k $2.4m $2.4m 0.00% New
50 Global IMC LLC 0.63% of their portfolio SOLANA BEACH, CA 78,43378.4k $2.4m $2.4m 0.63% Unchanged
51 Cubist Systematic Strategies, LLC 0.02% of their portfolio STAMFORD, CT 73,13273.1k $2.3m $2.3m 0.02% New
52 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 70,27770.3k $2.2m $2.2m 0.00% Added +49.0k +49,039
53 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 69,32269.3k $2.1m $2.1m 0.00% First filing
54 WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio Boston, MA 68,66968.7k $2.1m $2.1m 0.00% New
55 STRS OHIO 0.01% of their portfolio COLUMBUS, OH 52,76452.8k $1.6m $1.6m 0.01% Added +46.0k +45,964
56 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 50,80050.8k $1.6m $1.6m 0.00% New
57 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 49,32849.3k $1.5m $1.5m 0.00% Reduced -34.9k -34,934
58 RHUMBLINE ADVISERS 0.00% of their portfolio BOSTON, MA 42,98943.0k $1.3m $1.3m 0.00% Added +5.1k +5,066
59 ADAMS STREET PARTNERS LLC 0.40% of their portfolio CHICAGO, IL 38,54438.5k $1.2m $1.2m 0.40% New
60 MetLife Investment Management, LLC 0.01% of their portfolio Whippany, NJ 38,33638.3k $1.2m $1.2m 0.01% Added +21.5k +21,490
61 Swiss National Bank 0.00% of their portfolio ZURICH, V8 37,00037.0k $1.1m $1.1m 0.00% New
62 CAXTON CORP 2.87% of their portfolio Princeton, NJ 36,30236.3k $1.1m $1.1m 2.87% Reduced -39.9k -39,884
63 Partners Group Holding AG 0.08% of their portfolio BAAR-ZUG, V8 35,81835.8k $1.1m $1.1m 0.08% New
64 Jump Financial, LLC 0.05% of their portfolio Chicago, IL 33,00233.0k $1.0m $1.0m 0.05% New
65 TWO SIGMA ADVISERS, LP 0.00% of their portfolio NEW YORK, NY 31,30031.3k $969.7k $969.7k 0.00% New
66 FIRST TRUST ADVISORS LP 0.00% of their portfolio Wheaton, IL 30,08730.1k $932.2k $932.2k 0.00% New
67 ALPS ADVISORS INC 0.01% of their portfolio Denver, CO 29,72629.7k $920.9k $920.9k 0.01% New
68 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 26,70026.7k $827.2k $827.2k 0.00% Added +5.2k +5,200
69 Utah Retirement Systems 0.01% of their portfolio SALT LAKE CITY, UT 25,78925.8k $798.9k $798.9k 0.01% New
70 Squarepoint Ops LLC 0.01% of their portfolio NEW YORK, NY 25,27025.3k $782.9k $782.9k 0.01% New
71 SEI INVESTMENTS CO 0.00% of their portfolio OAKS, PA 25,11825.1k $778.2k $778.2k 0.00% Reduced -784 -784
72 Liberty Mutual Group Asset Management Inc. 0.21% of their portfolio Boston, MA 25,07325.1k $776.8k $776.8k 0.21% New
73 Russell Investments Group, Ltd. 0.00% of their portfolio Seattle, WA 24,54324.5k $760.3k $760.3k 0.00% New
74 Vident Investment Advisory, LLC 0.03% of their portfolio Alpharetta, GA 23,54023.5k $729.3k $729.3k 0.03% Reduced -12.3k -12,267
75 NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio ALBANY, NY 22,04622.0k $683.0k $683.0k 0.00% Added +4.5k +4,462
76 Allianz Asset Management GmbH 0.00% of their portfolio MUNICH, 2M 21,30021.3k $659.9k $659.9k 0.00% New
77 TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY 0.01% of their portfolio FRANKFORT, KY 19,97120.0k $619.0k $619.0k 0.01% New
78 PUTNAM INVESTMENTS LLC 0.00% of their portfolio BOSTON, MA 19,40319.4k $601.1k $601.1k 0.00% Reduced -10 -10
79 FRED ALGER MANAGEMENT, LLC 0.00% of their portfolio NEW YORK, NY 18,43318.4k $571.1k $571.1k 0.00% New
80 Walleye Capital LLC 0.01% of their portfolio NEW YORK, NY 16,27016.3k $504.0k $504.0k 0.01% Reduced -56.7k -56,733
81 HAMILTON LANE ADVISORS LLC 0.18% of their portfolio CONSHOHOCKEN, PA 16,05516.1k $497.0k $497.0k 0.18% New
82 DekaBank Deutsche Girozentrale 0.00% of their portfolio FRANKFURT, 2M 16,00016.0k $502.0k $502.0k 0.00% New
83 STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio MADISON, WI 15,31215.3k $474.4k $474.4k 0.00% New
84 Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio SEOUL, M5 14,34214.3k $444.3k $444.3k 0.00% New
85 Schonfeld Strategic Advisors LLC 0.00% of their portfolio NEW YORK, NY 14,30214.3k $443.1k $443.1k 0.00% Added +3.8k +3,771
86 AMERICAN INTERNATIONAL GROUP, INC. 0.00% of their portfolio New York, NY 13,98914.0k $433.4k $433.4k 0.00% Reduced -51 -51
87 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 13,70013.7k $424.4k $424.4k 0.00% New
88 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 12,58512.6k $389.9k $389.9k 0.00% Added +198 +198
89 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 11,76311.8k $364.4k $364.4k 0.00% Reduced -21.7k -21,726
90 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 11,67611.7k $361.7k $361.7k 0.00% New
91 CREDIT SUISSE AG/ 0.00% of their portfolio ZURICH, V8 11,63011.6k $360.3k $360.3k 0.00% Added +11.5k +11,465
92 HighTower Advisors, LLC 0.00% of their portfolio CHICAGO, IL 11,57211.6k $359.0k $359.0k 0.00% Added +72 +72
93 SG Americas Securities, LLC 0.00% of their portfolio NEW YORK, NY 10,75610.8k $333.0k $333.0k 0.00% Reduced -8.4k -8,361
94 Blue Owl Capital Holdings LP 0.14% of their portfolio New York, NY 10,63010.6k $329.3k $329.3k 0.14% New
95 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 10,49910.5k $325.3k $325.3k 0.00% New
96 PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio DES MOINES, IA 8,9018.9k $275.8k $275.8k 0.00% New
97 MYDA Advisors LLC 0.18% of their portfolio WOODMERE, NY 8,0008.0k $247.8k $247.8k 0.18% Reduced -2.0k -2,000
98 Jasper Ridge Partners, L.P. 0.01% of their portfolio MENLO PARK, CA 7,8807.9k $244.1k $244.1k 0.01% New
99 ALGERT GLOBAL LLC 0.01% of their portfolio SAN FRANCISCO, CA 7,6007.6k $235.4k $235.4k 0.01% New
100 ProShare Advisors LLC 0.00% of their portfolio BETHESDA, MD 7,4317.4k $230.2k $230.2k 0.00% New