Jim Simons
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Jim Simons’s Cabaletta Bio CABA Stock Holding History

Jim Simons’s Portfolio CABA Stock Details CABA Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$5.48M Buy
2,036,663
+514,080
+34% +$1.43M 0.01% 1331
2025
Q4 		$3.33M Buy
1,522,583
+183,160
+14% +$454K 0.01% 1576
2025
Q3 		$3.13M Buy
1,339,423
+1,213,323
+962% +$2.08M ﹤0.01% 1762
2025
Q2 		$192K Buy
126,100
+115,200
+1,057% +$180K ﹤0.01% 3181
2025
Q1 		$15.1K Sell
10,900
-219,261
-95% -$467K ﹤0.01% 3373
2024
Q4 		$522K Buy
+230,161
New +$808K ﹤0.01% 2823
2024
Q2 		– Sell
-59,000
Closed -$1.01M – 3525
2024
Q1 		$1.01M Buy
+59,000
New +$1.27M ﹤0.01% 2477
2023
Q3 		– Sell
-77,700
Closed -$1M – 3695
2023
Q2 		$1M Sell
77,700
-35,100
-31% -$381K ﹤0.01% 2468
2023
Q1 		$933K Sell
112,800
-50,600
-31% -$474K ﹤0.01% 2523
2022
Q4 		$1.51M Sell
163,400
-524,061
-76% -$1.91M ﹤0.01% 2257
2022
Q3 		$447K Buy
687,461
+352,461
+105% +$424K ﹤0.01% 2990
2022
Q2 		$355K Buy
335,000
+135,600
+68% +$192K ﹤0.01% 3357
2022
Q1 		$405K Buy
+199,400
New +$521K ﹤0.01% 3313
2021
Q3 		– Sell
-14,900
Closed -$128K – 3501
2021
Q2 		$128K Buy
+14,900
New +$146K ﹤0.01% 3329
2020
Q3 		– Sell
-61,447
Closed -$685K – 3393
2020
Q2 		$685K Buy
61,447
+48,447
+373% +$371K ﹤0.01% 2740
2020
Q1 		$95K Buy
+13,000
New +$178K ﹤0.01% 3238

Other funds holding CABA

T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
BCLSI
Bain Capital Life Sciences Investors Boston, Massachusetts $1.11B AUM 171.34% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $64.8B AUM 42.7% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
CAM
Cormorant Asset Management Boston, Massachusetts $1.99B AUM 737.95% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return

Jim Simons's CABA Position: Q1 2026 in Review

Jim Simons increased its Cabaletta Bio (CABA) stake by 34% in Q1 2026, buying an estimated $1.43M and bringing the position to 2,036,663 shares worth $5.48M. The position accounts for 0.01% of the portfolio, ranked #1331.

Jim Simons first reported a position in CABA in Q1 2020 and has held it in 16 quarters since. 108 funds tracked by Wall St. Rank hold CABA as of Q1 2026.

  • Jim Simons held 2,036,663 shares of Cabaletta Bio worth $5.48M as of Q1 2026.
  • Jim Simons bought 514,080 Cabaletta Bio shares in Q1 2026, an estimated $1.43M.
  • Cabaletta Bio made up 0.01% of Jim Simons's portfolio in Q1 2026, its #1331 holding.
  • Jim Simons first reported a position in Cabaletta Bio in Q1 2020 and has held it in 16 quarters since.
  • 108 funds tracked by Wall St. Rank held Cabaletta Bio as of Q1 2026.

Based on Renaissance Technologies's 13F filing for Q1 2026, filed 14 May 2026.