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ISSUER PROFILE · CIK 0001865494 · CUSIP 449778109

IO Biotech, Inc.IOBTQ

4 13D/G filings 2 distinct filers 0 insider transactions (365d)

Post-Filing Returns · across 1 activist filings on this issuer

Median 30d
avg —
Median 60d
avg —
Median 90d
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Median 180d
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Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
4
1 SCHEDULE 13D/A · 1 SCHEDULE · 2 SC
Distinct filers
2
multi-activist cluster
Insiders (365d)
0
0 buys · 0 sales
Latest short DTC
1.00
as of 2026-05-29

13D/G Filings Timeline · 4 total

FiledFormFilerStakeSharesIntent
2026-06-02 SCHEDULE 13D/A Lundbeckfond Invest A/S 27.40% 21,851,920 view →
2026-01-23 SCHEDULE Novo Holdings A/S 3.30% 2,469,135 view →
2023-08-14 SC Lundbeckfond Invest A/S view →
2023-08-11 SC Novo Holdings A/S view →

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-05-29 538,168 1.00 -3.6%
2026-05-15 558,213 1.00 -12.3%
2026-04-30 636,685 1.00 -13.4%
2026-04-15 734,940 1.00 -65.9%

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