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Who owns X4 Pharmaceuticals (XFOR) stock

86 funds reported X4 Pharmaceuticals (XFOR) shares in their latest 13F filings, worth $476M in all. The largest holder is Morgan Stanley ($44.2M). Last quarter 51 funds added to their stakes and 37 cut them.

Largest holders of XFOR (13F)Largest holders of XFOR (13F)Morgan Stanley$44.2MFMR LLC$38.9MBain Capital Life Sciences Invest…$37.2MPerceptive Advisors LLC$37.0MKalehua Capital Management LLC$34.8MSaturn V Capital Management LP$32.6MEmpery Asset Management, LP$32.4MDeep Track Capital, LP$27.5MBlackRock$25.9MNantahala Capital Management, LLC$22.9M

Largest holders (13F)

FundSharesValueChangeQuarter
Morgan Stanley9,461,279$44.2Mdecrease2026-06-30
FMR LLC8,321,657$38.9Mincrease2026-06-30
Bain Capital Life Sciences Investors, LLC7,967,454$37.2Munchanged2026-06-30
Perceptive Advisors LLC7,933,491$37.0Mincrease2026-06-30
Kalehua Capital Management LLC7,445,680$34.8Munchanged2026-06-30
Saturn V Capital Management LP6,973,343$32.6Mincrease2026-06-30
Empery Asset Management, LP6,930,591$32.4Mdecrease2026-06-30
Deep Track Capital, LP5,878,757$27.5Mdecrease2026-06-30
BlackRock5,554,906$25.9Mincrease2026-06-30
Nantahala Capital Management, LLC4,898,936$22.9Mincrease2026-06-30
Vanguard Capital Management LLC3,715,859$17.4Mincrease2026-06-30
Rosalind Advisors3,214,766$15.0Munchanged2026-06-30
Vanguard Group3,423,662$13.7Mincrease2025-12-31
Blackstone2,681,922$12.5Munchanged2026-06-30
Trails Edge Capital Partners, LP2,571,478$12.0Munchanged2026-06-30

X4 Pharmaceuticals' latest quarter

X4 Pharmaceuticals, Q3 2026: revenue $2.8M (+75% year over year), operating margin -714.0%, net loss $20.2M, operating cash flow −$20.2M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most XFOR stock?

By the latest 13F filings: Morgan Stanley ($44.2M); FMR LLC ($38.9M); Bain Capital Life Sciences Investors, LLC ($37.2M); Perceptive Advisors LLC ($37.0M); Kalehua Capital Management LLC ($34.8M).

What is the short interest in XFOR?

7,490,770 shares were sold short at the 2026-10-15 settlement, -1.31% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.