SCHEDULE 13G Filed 2026-06-25 Event — SEC 0000935836-26-000331 →

EcoR1 Capital, LLC → Fulcrum Therapeutics, Inc. FULC

Stake: — Shares: — Class: Common Stock

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

4 transactions

4 buys · 0 sales · 0 awards/exercises

Issuer Cluster

5 13D/G filings on this issuer

4 other filings besides this one

Filer Track Record

13 filings by this filer

12 other filings in the data moat

Short Interest · settle 2026-07-31

DTC 4.54

6,632,184 shares short · -4.0% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $27.12M

Point72 Asset Mgmt

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-07-15	TANG KEVIN	10%+ owner	Buy	107,377	$3.56	$382K
2026-07-14	TANG KEVIN	10%+ owner	Buy	53,651	$3.56	$191K
2026-07-14	TANG KEVIN	10%+ owner	Buy	75,952	$3.58	$272K
2026-07-13	TANG KEVIN	10%+ owner	Buy	12,966	$3.54	$46K

Other 13D/G Filings on Fulcrum Therapeutics, Inc.

Filed	Form	Filer	Stake	Shares
2026-08-03	SCHEDULE 13G	BANK OF AMERICA CORP /DE/	—	—	view →
2026-07-17	SCHEDULE 13G	BlackRock Portfolio Management LLC	—	—	view →
2026-06-25	SCHEDULE 13G	EcoR1 Capital, LLC	—	—	view →
2026-06-10	SCHEDULE 13G	TANG CAPITAL MANAGEMENT LLC	—	—	view →

Other Filings by EcoR1 Capital, LLC

Filed	Form	Issuer	Stake	Shares
2026-07-20	SCHEDULE 13G	Alto Neuroscience, Inc.	—	—	view →
2026-06-25	SCHEDULE 13G	Fulcrum Therapeutics, Inc. FULC	—	—	view →
2026-06-16	SCHEDULE 13G	Eloxx Pharmaceuticals, Inc. ELOX	—	—	view →
2025-05-19	SCHEDULE	GALAPAGOS NV GLPGF	11.84%	7,803,202	view →
2025-03-17	SCHEDULE	Zymeworks Inc. ZYME	24.20%	16,858,418	view →
2025-02-18	SCHEDULE	Zymeworks Inc. ZYME	22.80%	15,720,161	view →
2025-01-13	SCHEDULE	Zymeworks Inc. ZYME	22.40%	15,411,078	view →
2025-01-03	SCHEDULE	PROTHENA CORP PUBLIC LTD CO PRTA	21.50%	11,584,280	view →
2024-10-08	SC	GALAPAGOS NV GLPGF	—	—	view →
2022-01-14	SC	PROTHENA CORP PUBLIC LTD CO PRTA	—	—	view →
2021-05-11	SC	ANAPTYSBIO, INC ANABV	—	—	view →
2021-04-13	SC	ANAPTYSBIO, INC ANABV	—	—	view →

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