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ISSUER PROFILE · CIK 0001776111 · CUSIP 55287L101

MBX Biosciences, Inc.MBX

3 13D/G filings 3 distinct filers 6 insider transactions (365d)

Post-Filing Returns · across 3 activist filings on this issuer

Median 30d
avg —
Median 60d
avg —
Median 90d
avg —
Median 180d
avg —

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
3
3 SCHEDULE
Distinct filers
3
multi-activist cluster
Insiders (365d)
6
6 buys · 0 sales
Latest short DTC
8.46
as of 2026-05-29

Institutional Consensus · 2025-12-31

Held by elite portfolio managers
1 holder · $21.47M
Point72 Asset Mgmt

13D/G Filings Timeline · 3 total

FiledFormFilerStakeSharesIntent
2025-09-30 SCHEDULE Frazier Life Sciences Public Fund, L.P. 11.70% 5,224,095 view →
2025-09-30 SCHEDULE ORBIMED ADVISORS LLC 9.00% 4,002,887 view →
2025-09-30 SCHEDULE Norwest Venture Partners XVI, LP 4.80% 2,140,989 view →

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-06-04 Pescovitz Ora H. director Award 12,500 $30.91 $386K
2026-06-04 Heron Patrick J director, 10%+ Award 12,500 $30.91 $386K
2026-06-04 Stelzer Laurie director Award 12,500 $30.91 $386K
2026-06-04 Hoerter Steven L. director Award 12,500 $30.91 $386K
2026-06-04 Ryder Steven director Award 12,500 $30.91 $386K
2026-06-04 Aynechi Tiba director Award 12,500 $30.91 $386K

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-05-29 4,811,025 8.46 +12.3%
2026-05-15 4,284,613 4.99 +6.2%
2026-04-30 4,033,554 9.58 +6.5%
2026-04-15 3,786,542 7.71 +5.4%
2026-03-31 3,593,407 7.97 +20.4%
2026-03-13 2,983,725 5.00 +24.6%
2026-02-27 2,395,339 4.50 +8.7%
2026-02-13 2,202,822 3.08 +12.1%
2026-01-30 1,965,975 3.07 -14.8%
2026-01-15 2,307,824 2.88 -40.0%
2025-12-31 3,843,943 4.41 +6.4%
2025-12-15 3,611,905 4.34 -11.9%

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