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XFOR · X4 Pharmaceuticals, Inc · Holdings

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$3.50 +0.10 (+2.94%) At close · Sep 11
Market Cap
$347.01M
Shares
99.15M

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.

Holders: 90
Total Value: $465,400,778
Total Shares: 99,657,565

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 90 13F filers · Δ vs Mar 31, 2026
Top Holder
9.5%
Sep 2023 → Jun 2026 · range 9.5% – 19.2%
−0.6 pts
Top 5
40.8%
Sep 2023 → Jun 2026 · range 40.8% – 65.6%
−3.1 pts
Top 10
66.7%
Sep 2023 → Jun 2026 · range 66.7% – 90.6%
−2.0 pts
HHI
548
Sep 2023 → Jun 2026 · range 548 – 1,029
Broadly held−42

Quarterly Activity

vs Mar 31, 2026
New
33
Increased
24
Decreased
13
Sold Out
27
Unchanged
20
Holder count: +6
Institutional value: +20.0%
Shares held: +6.1%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 91 of 91
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1501697 CUSIP 98420X202 13F (30d) 41 filings 41 filers Visit website Investor relations