Vault-13

Y-MABS THERAPEUTICS INC YMAB

COM · Common Stock · CUSIP 984241109

98 institutional holders -7 vs Q1 2025
27,897,38327.9m shares reported held*
$125.8mreported value*
12 new 29 added 36 reduced 20 sold out net sold ≈ $4.1m (-911.0k 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 ($40.9k this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $4.51. Options: 3 managers hold calls ($151.2k notional), 2 hold puts ($2.0k).

Trends to Q2 2025

Institutional holders

Managers reporting a position, each quarter

050100150Q3 22: 100Q4 22: 92Q1 23: 87Q2 23: 96Q3 23: 100Q4 23: 95Q1 24: 98Q2 24: 98Q3 24: 107Q4 24: 115Q1 25: 105Q2 25: 9898Q3 22Q2 23Q1 24Q4 24Q2 25
Numbers
QuarterHolders
Q3 2022100
Q4 202292
Q1 202387
Q2 202396
Q3 2023100
Q4 202395
Q1 202498
Q2 202498
Q3 2024107
Q4 2024115
Q1 2025105
Q2 202598

Buyers vs sellers

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

Bought or addedCut or sold out
1000100Q3 23: 41 bought or addedQ3 23: 43 cut or sold outQ4 23: 44 bought or addedQ4 23: 47 cut or sold outQ4 23Q1 24: 45 bought or addedQ1 24: 61 cut or sold outQ2 24: 49 bought or addedQ2 24: 51 cut or sold outQ2 24Q3 24: 55 bought or addedQ3 24: 38 cut or sold outQ4 24: 51 bought or addedQ4 24: 42 cut or sold outQ4 24Q1 25: 56 bought or addedQ1 25: 53 cut or sold outQ2 25: 41 bought or addedQ2 25: 56 cut or sold outQ2 25
Numbers
QuarterBought or addedCut or sold out
Q3 20234143
Q4 20234447
Q1 20244561
Q2 20244951
Q3 20245538
Q4 20245142
Q1 20255653
Q2 20254156

Calls vs puts

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

CallsPuts
$0$200k$400k$600kQ3 24 calls: $563.2kQ3 24 puts: $5.3kQ3 24P/C 0.01Q4 24 calls: $50.3kQ4 24 puts: $8.0kQ4 24P/C 0.16Q1 25 calls: $171.4kQ1 25 puts: $9.3kQ1 25P/C 0.05Q2 25 calls: $151.2kQ2 25 puts: $2.0kQ2 25P/C 0.01
Numbers
QuarterCallsPutsP/C
Q3 2024$563.2k$5.3k0.01
Q4 2024$50.3k$8.0k0.16
Q1 2025$171.4k$9.3k0.05
Q2 2025$151.2k$2.0k0.01

Biggest buyers

Nantahala Capital Management, LLC New +351,878+351.9k
ACORN CAPITAL ADVISORS, LLC Added +183,608+183.6k
GSA CAPITAL PARTNERS LLP Added +165,431+165.4k
Stonepine Capital Management, LLC Added +154,140+154.1k
UBS Group AG Added +137,496+137.5k
AQR CAPITAL MANAGEMENT LLC Added +87,354+87.4k
JANE STREET GROUP, LLC New +60,873+60.9k
CITADEL ADVISORS LLC Added +53,687+53.7k
STATE OF WISCONSIN INVESTMENT BOARD New +51,336+51.3k
MARSHALL WACE, LLP New +40,181+40.2k

Biggest sellers

Pictet Asset Management Holding SA Sold out -441,934-441.9k
MILLENNIUM MANAGEMENT LLC Reduced -326,665-326.7k
MORGAN STANLEY Reduced -207,594-207.6k
WELLINGTON MANAGEMENT GROUP LLP Sold out -204,052-204.1k
BlackRock, Inc. Reduced -153,948-153.9k
Squarepoint Ops LLC Reduced -116,294-116.3k
JACOBS LEVY EQUITY MANAGEMENT, INC Reduced -94,870-94.9k
RENAISSANCE TECHNOLOGIES LLC Reduced -92,606-92.6k
Cubist Systematic Strategies, LLC Reduced -85,614-85.6k
JPMORGAN CHASE & CO Reduced -83,387-83.4k

Biggest calls

CITADEL ADVISORS LLC Reduced $108.2k24.0k shares
SIMPLEX TRADING, LLC Added $43.0k9.6k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Biggest puts

SIMPLEX TRADING, LLC New $2.0k600 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
ACORN BIOVENTURES, L.P. 13G · passive investor -0.8 pts · filed 2025-08-20 6.2% -0.8 pts 2.8m 2025-08-20

Fell to 5% or below in the last year: HBM Healthcare Investments (Cayman) Ltd. (0.0%, 2025-11-14), Beryl Capital Management LLC (0.0%, 2025-11-14), Caligan Partners LP (0.0%, 2025-11-14), Paradigm Biocapital Advisors LP (0.0%, 2025-11-14), GLAZER CAPITAL, LLC (0.0%, 2025-11-13)

Holders, Q2 2025

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Paradigm Biocapital Advisors LP 0.82% of their portfolio NEW YORK, NY 4,236,3464.2m $19.1m $19.1m 0.82% Unchanged
2 ACORN CAPITAL ADVISORS, LLC 10.09% of their portfolio NEW YORK, NY 3,418,9953.4m $15.4m $15.4m 10.09% Added +183.6k +183,608
3 BlackRock, Inc. 0.00% of their portfolio New York, NY 2,748,0772.7m $12.4m $12.4m 0.00% Reduced -153.9k -153,948
4 Caligan Partners LP 2.05% of their portfolio NEW YORK, NY 2,342,6092.3m $10.6m $10.6m 2.05% Unchanged
5 Sofinnova Investments, Inc. 0.67% of their portfolio Menlo Park, CA 2,194,2782.2m $9.9m $9.9m 0.67% Unchanged
6 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 1,943,2851.9m $8.8m $8.8m 0.00% Reduced -3.2k -3,224
7 Polar Capital Holdings Plc 0.04% of their portfolio London, X0 1,789,8001.8m $8.1m $8.1m 0.04% Reduced -41.2k -41,200
8 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 848,461848.5k $3.8m $3.8m 0.00% Reduced -1.0k -1,039
9 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 780,145780.1k $3.5m $3.5m 0.00% Reduced -8.9k -8,876
10 BOOTHBAY FUND MANAGEMENT, LLC 0.10% of their portfolio NEW YORK, NY 693,693693.7k $3.1m $3.1m 0.10% Unchanged
11 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 516,857516.9k $2.3m $2.3m 0.00% Reduced -32.8k -32,809
12 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 412,246412.2k $1.9m $1.9m 0.00% Reduced -6.3k -6,308
13 Nantahala Capital Management, LLC 0.11% of their portfolio NEW CANAAN, CT 351,878351.9k $1.6m $1.6m 0.11% New
14 Soleus Capital Management, L.P. 0.11% of their portfolio GREENWICH, CT 349,982350.0k $1.6m $1.6m 0.11% Unchanged
15 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 308,130308.1k $1.4m $1.4m 0.00% Reduced -19.8k -19,771
16 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 292,567292.6k $1.3m $1.3m 0.00% Reduced -207.6k -207,594
17 Stonepine Capital Management, LLC 1.27% of their portfolio Bend, OR 285,300285.3k $1.3m $1.3m 1.27% Added +154.1k +154,140
18 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 278,179278.2k $1.3m $1.3m 0.00% Added +569 +569
19 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 274,164274.2k $1.2m $1.2m 0.00% Reduced -8.2k -8,154
20 AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio Greenwich, CT 252,142252.1k $1.1m $1.1m 0.00% Added +87.4k +87,354
21 UBS Group AG 0.00% of their portfolio ZURICH, V8 229,072229.1k $1.0m $1.0m 0.00% Added +137.5k +137,496
22 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 212,751212.8k $959.5k $959.5k 0.00% Added +11.0k +10,975
23 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 207,642207.6k $936.5k $936.5k 0.00% Added +53.7k +53,687
24 GSA CAPITAL PARTNERS LLP 0.06% of their portfolio LONDON, X0 186,062186.1k $839.0k $839.0k 0.06% Added +165.4k +165,431
25 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 164,100164.1k $740.1k $740.1k 0.00% Reduced -92.6k -92,606
26 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 164,055164.1k $739.9k $739.9k 0.00% Reduced -83.4k -83,387
27 INFINITUM ASSET MANAGEMENT, LLC 0.16% of their portfolio FORT LAUDERDALE, FL 155,529155.5k $701.4k $701.4k 0.16% Unchanged
28 JACOBS LEVY EQUITY MANAGEMENT, INC 0.00% of their portfolio FLORHAM PARK, NJ 142,641142.6k $643.3k $643.3k 0.00% Reduced -94.9k -94,870
29 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 139,955140.0k $631.2k $631.2k 0.00% Reduced -326.7k -326,665
30 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 125,298125.3k $565.1k $565.1k 0.00% Reduced -29.5k -29,487
31 FEDERATED HERMES, INC. 0.00% of their portfolio PITTSBURGH, PA 119,425119.4k $538.6k $538.6k 0.00% Reduced -34.0k -34,028
32 TWO SIGMA ADVISERS, LP 0.00% of their portfolio NEW YORK, NY 115,700115.7k $521.8k $521.8k 0.00% Reduced -27.6k -27,600
33 RICE HALL JAMES & ASSOCIATES, LLC 0.03% of their portfolio San Diego, CA 109,604109.6k $494.3k $494.3k 0.03% Added +6.0k +5,962
34 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 99,35299.4k $448.1k $448.1k 0.00% Added +6.9k +6,878
35 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 94,38394.4k $425.7k $425.7k 0.00% Reduced -1.1k -1,119
36 Nuveen, LLC 0.00% of their portfolio CHARLOTTE, NC 93,41893.4k $421.3k $421.3k 0.00% Reduced -19.1k -19,065
37 XTX Topco Ltd 0.02% of their portfolio LONDON, X0 86,44086.4k $389.8k $389.8k 0.02% Reduced -5.0k -5,014
38 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 72,84272.8k $328.5k $328.5k 0.00% Added +26.1k +26,084
39 Cubist Systematic Strategies, LLC 0.00% of their portfolio STAMFORD, CT 69,90869.9k $315.3k $315.3k 0.00% Reduced -85.6k -85,614
40 RHUMBLINE ADVISERS 0.00% of their portfolio BOSTON, MA 68,39968.4k $308.5k $308.5k 0.00% Added +14.5k +14,490
41 STRS OHIO 0.00% of their portfolio COLUMBUS, OH 62,40062.4k $281.4k $281.4k 0.00% Added +19.0k +19,000
42 Jump Financial, LLC 0.00% of their portfolio Chicago, IL 61,50061.5k $277.4k $277.4k 0.00% Added +23.4k +23,421
43 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 60,87360.9k $274.5k $274.5k 0.00% New
44 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 59,38059.4k $267.8k $267.8k 0.00% Added +4.6k +4,600
45 BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.01% of their portfolio HOUSTON, TX 55,70055.7k $251.2k $251.2k 0.01% Added +30.8k +30,800
46 STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio MADISON, WI 51,33651.3k $231.5k $231.5k 0.00% New
47 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 51,09051.1k $230.4k $230.4k 0.00% Reduced -9.6k -9,570
48 SAPIENT CAPITAL LLC 0.00% of their portfolio INDIANAPOLIS, IN 43,70043.7k $197.1k $197.1k 0.00% Unchanged
49 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 42,83342.8k $193.2k $193.2k 0.00% Added +10.3k +10,286
50 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 40,18140.2k $181.2k $181.2k 0.00% New
51 AlphaQuest LLC 0.02% of their portfolio New York, NY 38,92538.9k $175.6k $175.6k 0.02% Unchanged
52 FMR LLC 0.00% of their portfolio BOSTON, MA 30,86830.9k $139.2k $139.2k 0.00% Added +1.6k +1,607
53 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 28,80328.8k $129.9k $129.9k 0.00% Unchanged
54 ALPS ADVISORS INC 0.00% of their portfolio Denver, CO 24,42924.4k $110.2k $110.2k 0.00% Reduced -8.9k -8,880
55 MetLife Investment Management, LLC 0.00% of their portfolio Whippany, NJ 21,92821.9k $98.9k $98.9k 0.00% Added +4.9k +4,852
56 INTECH INVESTMENT MANAGEMENT LLC 0.00% of their portfolio WEST PALM BEACH, FL 21,67421.7k $97.8k $97.8k 0.00% Reduced -5.0k -5,021
57 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio CAUSEWAY BAY, K3 21,18521.2k $95.5k $95.5k 0.00% Reduced -936 -936
58 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 19,03719.0k $85.9k $85.9k 0.00% Added +1.2k +1,185
59 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 17,21117.2k $78.0k $78.0k 0.00% Unchanged
60 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 15,25015.2k $68.8k $68.8k 0.00% Reduced -13.3k -13,268
61 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.00% of their portfolio TALLAHASSEE, FL 14,59614.6k $65.8k $65.8k 0.00% Unchanged
62 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 13,14313.1k $59.3k $59.3k 0.00% Reduced -796 -796
63 Squarepoint Ops LLC 0.00% of their portfolio NEW YORK, NY 12,23312.2k $55.2k $55.2k 0.00% Reduced -116.3k -116,294
64 Point72 Asia (Singapore) Pte. Ltd. 0.01% of their portfolio SINGAPORE, U0 12,17112.2k $54.9k $54.9k 0.01% Reduced -18.9k -18,917
65 HSBC HOLDINGS PLC 0.00% of their portfolio LONDON, X0 11,94811.9k $54.8k $54.8k 0.00% New
66 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 11,49411.5k $51.8k $51.8k 0.00% Added +6.5k +6,474
67 VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio ATLANTA, GA 10,74210.7k $48.4k $48.4k 0.00% Reduced -9.7k -9,680
68 LOS ANGELES CAPITAL MANAGEMENT LLC 0.00% of their portfolio LOS ANGELES, CA 10,28410.3k $46.4k $46.4k 0.00% New
69 NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio ALBANY, NY 10,11010.1k $45.6k $45.6k 0.00% Unchanged
70 China Universal Asset Management Co., Ltd. 0.00% of their portfolio SHANGHAI, F4 9,0979.1k $41.0k $41.0k 0.00% Added +113 +113
71 RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio ST. PETERSBURG, FL 7,7017.7k $34.7k $34.7k 0.00% New
72 Police & Firemen's Retirement System of New Jersey 0.00% of their portfolio TRENTON, NJ 7,3277.3k $33.0k $33.0k 0.00% Unchanged
73 CWM, LLC 0.00% of their portfolio OMAHA, NE 7,1217.1k $32.0k $32.0k 0.00% Added +4.8k +4,771
74 Brooklyn Investment Group 0.00% of their portfolio NEW YORK, NY 4,9515.0k $22.3k $22.3k 0.00% Reduced -972 -972
75 Legal & General Group Plc 0.00% of their portfolio London, X0 4,1314.1k $18.6k $18.6k 0.00% Reduced -4.4k -4,444
76 Ameritas Investment Partners, Inc. 0.00% of their portfolio LINCOLN, NE 3,7013.7k $16.7k $16.7k 0.00% Unchanged
77 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 3,2243.2k $14.0k $14.0k 0.00% Added +1.5k +1,514
78 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio WEST SACRAMENTO, CA 2,6652.7k $12.0k $12.0k 0.00% Unchanged
79 Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio SEOUL, M5 1,7501.8k $7.9k $7.9k 0.00% Added +245 +245
80 EverSource Wealth Advisors, LLC 0.00% of their portfolio BIRMINGHAM, AL 1,2651.3k $5.7k $5.7k 0.00% Added +1.2k +1,221
81 AMALGAMATED BANK 0.00% of their portfolio NEW YORK, NY 1,2171.2k $5.0k $5.0k 0.00% Unchanged
82 GF FUND MANAGEMENT CO. LTD. 0.00% of their portfolio GUANGZHOU, F4 1,1111.1k $5.0k $5.0k 0.00% Unchanged
83 Essential Partners LLC 0.00% of their portfolio RANCHO SANTA FE, CA 930930 $4.2k $4.2k 0.00% First filing
84 IFP Advisors, Inc 0.00% of their portfolio TAMPA, FL 334334 $1.5k $1.5k 0.00% Added +334 +334
85 Point72 (DIFC) Ltd 0.00% of their portfolio DUBAI, C0 287287 $1.3k $1.3k 0.00% Reduced -4.8k -4,771
86 Allworth Financial LP 0.00% of their portfolio FOLSOM, CA 201201 $907 $907 0.00% New
87 Daiwa Securities Group Inc. 0.00% of their portfolio CHIYODA-KU,TOKYO, M0 162162 $1.0k $1.0k 0.00% Unchanged
88 PNC Financial Services Group, Inc. 0.00% of their portfolio Pittsburgh, PA 129129 $582 $582 0.00% New
89 Rialto Wealth Management, LLC 0.00% of their portfolio SYRACUSE, NY 122122 $551 $551 0.00% New
90 NISA INVESTMENT ADVISORS, LLC 0.00% of their portfolio ST. LOUIS, MO 104104 $469 $469 0.00% Reduced -155 -155
91 Sterling Capital Management LLC 0.00% of their portfolio CHARLOTTE, NC 8787 $392 $392 0.00% Added +49 +49
92 ROTHSCHILD INVESTMENT LLC 0.00% of their portfolio CHICAGO, IL 5050 $226 $226 0.00% Reduced -60 -60
93 True Wealth Design, LLC 0.00% of their portfolio AKRON, OH 2929 $131 $131 0.00% Added +12 +12
94 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 1616 $72 $72 0.00% Unchanged
95 Clearstead Advisors, LLC 0.00% of their portfolio CLEVELAND, OH 99 $41 $41 0.00% New
96 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 44 $18 $18 0.00% New
97 Farther Finance Advisors, LLC 0.00% of their portfolio SAN FRANCISCO, CA 11 $5 $5 0.00% Reduced -2.0k -1,997
98 CONCOURSE FINANCIAL GROUP SECURITIES, INC. — of their portfolio BIRMINGHAM, AL 00 $0 $0 — Unchanged