JY
XFOR icon

Jeff Yass’s X4 Pharmaceuticals XFOR Stock Holding History

Jeff Yass’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
Q2 		$1.17M Buy
+250,300
New +$1.03M ﹤0.01% 7804
2026
Q1 		– Sell
-127,900
Closed -$512K – 14240
2025
Q4 		$512K Hold
127,900
– – ﹤0.01% 8730
2025
Q3 		$437K Hold
127,900
– – ﹤0.01% 9265
2025
Q2 		$243K Buy
127,900
+122,477
+2,258% +$501K ﹤0.01% 10810
2025
Q1 		$39K Sell
5,423
-2,360
-30% -$32.5K ﹤0.01% 11935
2024
Q4 		$170K Buy
7,783
+3,223
+71% +$51.4K ﹤0.01% 10903
2024
Q3 		$91.7K Sell
4,560
-763
-14% -$15.9K ﹤0.01% 11100
2024
Q2 		$92.6K Buy
5,323
+1,240
+30% +$40.6K ﹤0.01% 11071
2024
Q1 		$170K Buy
4,083
+3,130
+328% +$87.1K ﹤0.01% 10776
2023
Q4 		$24K Buy
953
+293
+44% +$7.13K ﹤0.01% 11934
2023
Q3 		$21.6K Sell
660
-2,110
-76% -$92K ﹤0.01% 11580
2023
Q2 		$161K Buy
2,770
+2,387
+623% +$123K ﹤0.01% 10503
2023
Q1 		$10K Sell
383
-2,850
-88% -$83.6K ﹤0.01% 12208
2022
Q4 		$96K Buy
+3,233
New +$153K ﹤0.01% 10995
2022
Q1 		– Sell
-1,603
Closed -$110K – 14106
2021
Q4 		$110K Sell
1,603
-147
-8% -$18.6K ﹤0.01% 12078
2021
Q3 		$278K Buy
+1,750
New +$288K ﹤0.01% 10768

Other funds holding XFOR

Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
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
EAM
Empery Asset Management New York $86.5M AUM
DTC
Deep Track Capital Greenwich, Connecticut $6.87B AUM 205.24% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
KCM
Kalehua Capital Management Dallas, Texas $174M AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Jeff Yass's XFOR Position: Q2 2026 in Review

Jeff Yass reduced its X4 Pharmaceuticals (XFOR) stake by 98% in Q2 2026, selling an estimated $3.46M and leaving 14,050 shares worth $65.6K. The position accounts for ﹤0.01% of the portfolio, ranked #12725.

Jeff Yass first reported a position in XFOR in Q2 2019 and has held it in 20 quarters since. The position peaked at $3.54M in Q1 2026. 88 funds tracked by Wall St. Rank hold XFOR as of Q2 2026.

  • Jeff Yass held 14,050 shares of X4 Pharmaceuticals worth $65.6K as of Q2 2026.
  • Jeff Yass sold 842,172 X4 Pharmaceuticals shares in Q2 2026, an estimated $3.46M.
  • X4 Pharmaceuticals made up ﹤0.01% of Jeff Yass's portfolio in Q2 2026, its #12725 holding.
  • Jeff Yass first reported a position in X4 Pharmaceuticals in Q2 2019 and has held it in 20 quarters since.
  • Jeff Yass's X4 Pharmaceuticals position peaked at $3.54M in Q1 2026.
  • 88 funds tracked by Wall St. Rank held X4 Pharmaceuticals as of Q2 2026.

Based on Susquehanna International Group's 13F filing for Q2 2026, filed 14 Aug 2026.