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Siren LLC’s X4 Pharmaceuticals XFOR Stock Holding History

Siren LLC’s Portfolio XFOR Stock Details XFOR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-1,500,000
Closed -$6M – 125
2025
Q4 		$6M Buy
+1,500,000
New +$5.45M 0.18% 75

Other funds holding XFOR

Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
EAM
Empery Asset Management New York $86.5M AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BCLSI
Bain Capital Life Sciences Investors Boston, Massachusetts $1.68B AUM 126.09% 1-Year Est. Return
PA
Perceptive Advisors New York $6.66B AUM 360.84% 1-Year Est. Return
SVCM
Saturn V Capital Management Austin, Texas $697M AUM 628.57% 1-Year Est. Return
DTC
Deep Track Capital Greenwich, Connecticut $6.87B AUM 205.24% 1-Year Est. Return
KCM
Kalehua Capital Management Dallas, Texas $174M AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
B
Braidwell Stamford, Connecticut $2.7B AUM 88.53% 1-Year Est. Return

Siren LLC's XFOR Position: Q1 2026 in Review

Siren LLC sold out of X4 Pharmaceuticals (XFOR) in Q1 2026, closing a stake of 1,500,000 shares — an estimated $6M sold.

Siren LLC first reported a position in XFOR in Q4 2025 and held it in 1 quarter. The position peaked at $6M in Q4 2025. 84 funds tracked by Wall St. Rank hold XFOR as of Q1 2026.

  • Siren LLC reported no remaining X4 Pharmaceuticals position as of Q1 2026 after selling out during the quarter.
  • Siren LLC sold 1,500,000 X4 Pharmaceuticals shares in Q1 2026, an estimated $6M.
  • Siren LLC first reported a position in X4 Pharmaceuticals in Q4 2025 and held it in 1 quarter.
  • Siren LLC's X4 Pharmaceuticals position peaked at $6M in Q4 2025.
  • 84 funds tracked by Wall St. Rank held X4 Pharmaceuticals as of Q1 2026.

Based on Siren LLC's 13F filing for Q1 2026, filed 14 May 2026.