Renaissance Technologies
XFOR icon

Renaissance Technologies’s X4 Pharmaceuticals XFOR Stock Holding History

Renaissance Technologies’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 		$84.5K Buy
+18,100
New +$74.3K ﹤0.01% 2997
2025
Q4 		– Sell
-19,177
Closed -$65.6K – 3827
2025
Q3 		$65.6K Buy
19,177
+1,811
+10% +$4.67K ﹤0.01% 3309
2025
Q2 		$33K Buy
17,366
+16,696
+2,492% +$68.3K ﹤0.01% 3433
2025
Q1 		$4.75K Buy
+670
New +$9.23K ﹤0.01% 3401
2023
Q2 		– Sell
-336
Closed -$9K – 4317
2023
Q1 		$9K Sell
336
-2,824
-89% -$82.8K ﹤0.01% 3894
2022
Q4 		$94K Sell
3,160
-4,913
-61% -$233K ﹤0.01% 3641
2022
Q3 		$414K Buy
8,073
+867
+12% +$30K ﹤0.01% 3040
2022
Q2 		$209K Buy
7,206
+1,436
+25% +$54.6K ﹤0.01% 3634
2022
Q1 		$303K Buy
5,770
+1,194
+26% +$68.5K ﹤0.01% 3470
2021
Q4 		$314K Buy
4,576
+563
+14% +$71.2K ﹤0.01% 3321
2021
Q3 		$637K Sell
4,013
-343
-8% -$56.4K ﹤0.01% 2783
2021
Q2 		$850K Sell
4,356
-845
-16% -$212K ﹤0.01% 2747
2021
Q1 		$1.34M Sell
5,201
-213
-4% -$56K ﹤0.01% 2466
2020
Q4 		$1.04M Buy
5,414
+213
+4% +$41.8K ﹤0.01% 2479
2020
Q3 		$1.06M Buy
5,201
+1,773
+52% +$425K ﹤0.01% 2489
2020
Q2 		$959K Buy
3,428
+1,633
+91% +$447K ﹤0.01% 2561
2020
Q1 		$538K Sell
1,795
-316
-15% -$89.7K ﹤0.01% 2729
2019
Q4 		$678K Buy
+2,111
New +$757K ﹤0.01% 2788

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

Renaissance Technologies's XFOR Position: Q2 2026 in Review

Renaissance Technologies opened a new position in X4 Pharmaceuticals (XFOR) in Q2 2026: 18,100 shares worth $84.5K. The stake represents ﹤0.01% of the portfolio and ranks #2997 among its holdings. This is a return to the name: Renaissance Technologies previously reported a position in XFOR as recently as Q3 2025.

Renaissance Technologies first reported a position in XFOR in Q4 2019 and has held it in 18 quarters since. The position peaked at $1.34M in Q1 2021. 89 funds tracked by Wall St. Rank hold XFOR as of Q2 2026.

  • Renaissance Technologies held 18,100 shares of X4 Pharmaceuticals worth $84.5K as of Q2 2026.
  • X4 Pharmaceuticals was a new Renaissance Technologies position in Q2 2026.
  • X4 Pharmaceuticals made up ﹤0.01% of Renaissance Technologies's portfolio in Q2 2026, its #2997 holding.
  • Renaissance Technologies first reported a position in X4 Pharmaceuticals in Q4 2019 and has held it in 18 quarters since.
  • Renaissance Technologies's X4 Pharmaceuticals position peaked at $1.34M in Q1 2021.
  • 89 funds tracked by Wall St. Rank held X4 Pharmaceuticals as of Q2 2026.

Based on Renaissance Technologies's 13F filing for Q2 2026, filed 13 Aug 2026.