Ken Griffin
MBIO icon

Ken Griffin’s Mustang Bio MBIO Stock Holding History

Ken Griffin’s Portfolio MBIO Stock Details MBIO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$38.7K Sell
53,200
-31,565
-37% -$29.7K ﹤0.01% 12498
2025
Q4 		$83.2K Buy
+84,765
New +$112K ﹤0.01% 11775
2025
Q3 		– Sell
-28,069
Closed -$26.8K – 13560
2025
Q2 		$26.8K Buy
+28,069
New +$34K ﹤0.01% 12031
2024
Q4 		– Sell
-2,255
Closed -$26.5K – 15033
2024
Q3 		$26.5K Buy
+2,255
New +$37.3K ﹤0.01% 12548
2023
Q2 		– Sell
-77
Closed -$21.2K – 14874
2023
Q1 		$21.2K Buy
+77
New +$31.6K ﹤0.01% 13028
2022
Q3 		– Sell
-738
Closed -$342K – 13201
2022
Q2 		$324K Buy
738
+687
+1,347% +$380K ﹤0.01% 9637
2022
Q1 		$39K Sell
51
-138
-73% -$113K ﹤0.01% 12953
2021
Q4 		$236K Buy
189
+70
+59% +$113K ﹤0.01% 11494
2021
Q3 		$240K Sell
119
-151
-56% -$324K ﹤0.01% 11568
2021
Q2 		$673K Buy
270
+168
+165% +$412K ﹤0.01% 9333
2021
Q1 		$253K Sell
102
-94
-48% -$279K ﹤0.01% 11206
2020
Q4 		$556K Sell
196
-91
-32% -$218K ﹤0.01% 7943
2020
Q3 		$679K Buy
287
+240
+511% +$592K ﹤0.01% 6749
2020
Q2 		$112K Sell
47
-3
-6% -$7.01K ﹤0.01% 8933
2020
Q1 		$101K Buy
50
+8
+19% +$20.5K ﹤0.01% 8631
2019
Q4 		$129K Buy
42
+9
+27% +$20.6K ﹤0.01% 8438
2019
Q3 		$81K Buy
33
+18
+120% +$49.2K ﹤0.01% 8567
2019
Q2 		$42K Buy
+15
New +$42.8K ﹤0.01% 8781
2019
Q1 		– Sell
-15
Closed -$34K – 9632
2018
Q4 		$34K Sell
15
-6
-29% -$18.2K ﹤0.01% 8583
2018
Q3 		$93K Buy
+21
New +$105K ﹤0.01% 8600

Other funds holding MBIO

KAS
Kestra Advisory Services Austin, Texas $31B AUM 28.39% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
VFT
Vanguard Fiduciary Trust Malvern, Pennsylvania $454B AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
CG
CFO4Life Group Coppell, Texas $743M AUM 25.26% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
TRCT
Tower Research Capital (TRC) New York $4.08B AUM 58.77% 1-Year Est. Return
SS
SBI Securities Tokyo, Japan $4.4B AUM 74.26% 1-Year Est. Return

Ken Griffin's MBIO Position: Q1 2026 in Review

Ken Griffin reduced its Mustang Bio (MBIO) stake by 37% in Q1 2026, selling an estimated $29.7K and leaving 53,200 shares worth $38.7K. The position accounts for ﹤0.01% of the portfolio, ranked #12498.

Ken Griffin first reported a position in MBIO in Q3 2018 and has held it in 20 quarters since. The position peaked at $679K in Q3 2020. 22 funds tracked by Wall St. Rank hold MBIO as of Q1 2026.

  • Ken Griffin held 53,200 shares of Mustang Bio worth $38.7K as of Q1 2026.
  • Ken Griffin sold 31,565 Mustang Bio shares in Q1 2026, an estimated $29.7K.
  • Mustang Bio made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #12498 holding.
  • Ken Griffin first reported a position in Mustang Bio in Q3 2018 and has held it in 20 quarters since.
  • Ken Griffin's Mustang Bio position peaked at $679K in Q3 2020.
  • 22 funds tracked by Wall St. Rank held Mustang Bio as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.