SC Filed 2019-07-17 Event — SEC 0001193125-19-195714 →

Polaris Venture Partners V, L.P. → X4 Pharmaceuticals, Inc XFOR

Stake: — Shares: —

Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 25/100 · Filer 90d Win Rate: 0% · Hist. 90d Edge: +0.0%

Passive Schedule 13G filer baseline
Held by 1 tracked 13F institutional manager
Elevated short days-to-cover (12.5 DTC)

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)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

5 13D/G filings on this issuer

4 other filings besides this one

Filer Track Record

12 filings by this filer

11 other filings in the data moat

Short Interest · settle 2026-10-15

DTC 12.50

7,490,770 shares short · -1.3% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $3.23M

Point72 Asset Mgmt

Other 13D/G Filings on X4 Pharmaceuticals, Inc

Filed	Form	Filer	Stake	Shares
2026-09-21	SCHEDULE 13G	Venrock Healthcare Capital Partners III, L.P.	—	—	view →
2019-05-28	SC	New Enterprise Associates 16, L.P.	—	—	view →
2019-03-19	SC	ORBIMED ADVISORS LLC	—	—	view →
2018-01-26	SC	ORBIMED ADVISORS LLC	—	—	view →

Other Filings by Polaris Venture Partners V, L.P.

Filed	Form	Issuer	Stake	Shares
2025-11-07	SCHEDULE	Invivyd, Inc. IVVD	3.00%	7,008,590	view →
2022-03-30	SC	Adagio Therapeutics, Inc. IVVD	—	—	view →
2019-07-17	SC	Pulmatrix, Inc. PULM	—	—	view →
2019-07-17	SC	aTYR PHARMA INC ATYR	—	—	view →
2019-02-14	SC	GENOCEA BIOSCIENCES, INC.	—	—	view →
2019-02-14	SC	Dare Bioscience, Inc. DARE	—	—	view →
2019-02-14	SC	T2 Biosystems, Inc.	—	—	view →
2019-02-14	SC	TREVENA INC	—	—	view →
2019-02-04	SC	SELECTA BIOSCIENCES INC RNAC	—	—	view →
2018-05-03	SC	SELECTA BIOSCIENCES INC RNAC	—	—	view →
2018-04-12	SC	Pulmatrix, Inc. PULM	—	—	view →

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