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AGMB · AgomAb Therapeutics NV · Holdings

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$8.40 -0.17 (-1.98%) At close · Oct 27
Rebalance outlook locked
Market Cap
$413.68M
Shares
49.25M
Volume · Oct 27 89.8K Avg daily vol (3M) 136.23K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP → See every holder of AGMB: 13F, 13D and 13G, insiders and funds →
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 35
Total Value: $334,263,799
Total Shares: 25,978,630

Institutional Ownership Trend

3 quarters

Holder Concentration

Across 34 13F filers
Top Holder
19.8%
Mar 2026 → Jun 2026 · range 19.8% – 22.0%
of institutional value
Top 5
58.5%
Mar 2026 → Jun 2026 · range 58.5% – 60.2%
of institutional value
Top 10
88.3%
Mar 2026 → Jun 2026 · range 87.9% – 88.3%
of institutional value
HHI
974
Mar 2026 → Jun 2026 · range 974 – 1,045
Broadly held

Who Holds AGMB

Last 3 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 34 filers, like-for-like change +11.1%; actively managed books +11.0%; index-like books +15.4%.

Holder type Share Filers Change
Registered adviser 38.2% 14 +39.1%
Exempt adviser 25.7% 2 -4.3%
Adviser 6.2% 1 0.0%
Bank 0.0% 2 +80.6%
Non-US 0.2% 3 0.0%
Holding company 8.9% 4 +5.1%
Unknown 20.7% 8 -0.1%

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Conviction and Crowding

34 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
3
8.82% of filers hold it in their top 10
Mar 31, 2026: 3
Holders above 5%
3
median weight 0.016%
Mar 31, 2026: 3
Crowding
—
a foreign private issuer reports ordinary shares, a different unit from the listed shares
Private-fund advisers
—
of shares outstanding
Institutional ownership
—
a foreign private issuer reports ordinary shares, a different unit from the listed shares
Top 10 holders
88.3%
of 13F shares, Herfindahl 0.097
Active holders
+11.0%
like-for-like share change of active filers
5% stakes on record
6
1 13D, 5 13G (2 institutional, 0 passive, 3 exempt)
How long holders have held it value-weighted 2.0 quarters
Under 1 year 100.0% 1 to 3 years 0.000% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net sellers of $1,715,434 (0 buying, 1 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost
$13.79
estimated per share
Mar 31, 2026: $14.16
Quarter-end price
$12.98
implied by 13F values
Estimated gain or loss
-5.8%
price against the estimated cost
Estimated at a loss
88.4%
of costed 13F value

Estimated cost covers 100.0% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies AGMB's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 ELOX Eloxx Pharmaceuticals, Inc. 3
2 SLN Silence Therapeutics plc 4
3 ADCT ADC Therapeutics SA 3
4 OCS Oculis Holding AG 3
5 ODTX Odyssey Therapeutics, Inc. 4
6 AMLX Amylyx Pharmaceuticals, Inc. 5
7 KRRO Korro Bio, Inc. 3
8 NGNE Neurogene Inc. 3
9 PBLS Parabilis Medicines, Inc. 4
10 DMRA Damora Therapeutics, Inc. 4

Shareholder Targets

13F filers that own its peers but not AGMB, quarter ended Jun 30, 2026

Found through its holder-overlap peers: ELOX, SLN, ADCT, OCS, ODTX, AMLX, KRRO, NGNE, PBLS, DMRA, ABVX, RACC, COGT, TNGX, ORIC, DBVT, RAPP, IVVD, ALT, TRAX. 719 filers in all.

# Filer In peers
1 BlackRock, Inc. Holding company, Index-like $1,738,082,470 16 held
2 RA CAPITAL MANAGEMENT, L.P. Registered adviser, Concentrated $1,025,007,158 4 held
3 Jupiter Topco LLC Unknown, Diversified active $942,536,701 11 held
4 VANGUARD CAPITAL MANAGEMENT LLC Registered adviser, Index-like $785,711,946 14 held
5 STATE STREET CORP Bank, Index-like $715,153,216 15 held
6 RTW INVESTMENTS, LP Registered adviser, Diversified active $570,259,798 4 held
7 PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser, Diversified active $558,474,281 15 held
8 VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser, Diversified active $489,675,727 14 held
9 Darwin Global Management, Ltd. Exempt adviser, Concentrated $482,612,150 1 held
10 GEODE CAPITAL MANAGEMENT, LLC Registered adviser, Index-like $477,553,685 18 held

Fund Ownership of AGMB by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 0.02% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 0.02% 8,746
Index ETFs 0.00% 0
Active ETFs 0.00% 0
Active funds 6.64% 3,269,893
Unclassified 0.00% 0
All registered funds 6.66% 3,278,639
How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 14 Exempt adviser 2 Adviser 1 Bank 2 Non-US 3 Holding company 4 Unknown 9
Showing 35 of 35
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Holder Value (USD) % of 13F Shares Open
EQT Fund Management S.a r.l. $66,743,056 19.97% 5,141,992
Sanofi $36,124,586 10.81% 2,783,096
Redmile Group, LLC $35,486,359 10.62% 2,733,926
Cormorant Asset Management, LP $32,000,217 9.57% 2,465,348
TCG Crossover Management, LLC $26,650,964 7.97% 2,053,233
FEDERATED HERMES, INC. $21,001,640 6.28% 1,618,000
Nantahala Capital Management, LLC $20,355,080 6.09% 1,568,188
Casdin Capital, LLC $20,119,000 6.02% 1,550,000
FMR LLC $18,933,627 5.66% 1,458,677
ANDERA PARTNERS $17,079,592 5.11% 1,538,702
Aberdeen Group plc $10,990,101 3.29% 846,695
PERCEPTIVE ADVISORS LLC $7,788,000 2.33% 600,000
SAMSARA BIOCAPITAL, LLC $7,788,000 2.33% 600,000
Siren, L.L.C. $5,338,025 1.60% 411,250
ORBIMED ADVISORS LLC $2,501,765 0.75% 192,740
Pfizer Inc $973,500 0.29% 75,000
ALPS ADVISORS INC $648,792 0.19% 49,984
Bellevue Group AG $639,239 0.19% 49,248
SEVEN GRAND MANAGERS, LLC $617,848 0.18% 47,600
SECTORAL ASSET MANAGEMENT INC $564,630 0.17% 43,500
Burkehill Global Management, LP $454,300 0.14% 35,000
Quadrature Capital Ltd $265,583 0.08% 20,461
Crossmark Global Holdings, Inc. $256,365 0.08% 23,096
TWO SIGMA INVESTMENTS, LP $234,574 0.07% 18,072
HRT FINANCIAL LP $221,633 0.07% 17,075
GOLDMAN SACHS GROUP INC $153,164 0.05% 11,800
XTX Topco Ltd $133,317 0.04% 10,271
CITIGROUP INC $123,258 0.04% 9,496
UBS Group AG $27,620 0.01% 2,128
MORGAN STANLEY $15,576 0.00% 1,200
GAMMA Investing LLC $15,495 0.00% 1,396
BNP PARIBAS ARBITRAGE, SA $9,786 0.00% 754
Larson Financial Group LLC $9,060 0.00% 698
Caitong International Asset Management Co., Ltd $25 0.00% 2
SBI Securities Co., Ltd. $22 0.00% 2
Key facts CIK 2020932 CUSIP 00860C102 13F (30d) 4 filings 4 filers Visit website Investor relations