Simplex Trading’s Korro Bio KRRO Stock Holding History

Simplex Trading’s Portfolio KRRO Stock Details KRRO Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$26.4K	Buy	2,000 +700	+54%	+$8.7K	﹤0.01%	6864
2026 Q1	$14.7K	Hold	1,300	–	–	﹤0.01%	7012
2025 Q4	$10.4K	Buy	+1,300	New	+$30.4K	﹤0.01%	6961
2023 Q2	–	Sell	-44	Closed	-$1K	–	9481
2023 Q1	$1K	Sell	44 -116	-73%	-$13.2K	﹤0.01%	8713
2022 Q4	$30K	Sell	160 -1,268	-89%	-$130K	﹤0.01%	6464
2022 Q3	$127K	Buy	1,428 +1,386	+3,300%	+$141K	﹤0.01%	5205
2022 Q2	$3K	Sell	42 -22	-34%	-$1.49K	﹤0.01%	9157
2022 Q1	$6K	Sell	64 -54	-46%	-$10.3K	﹤0.01%	9293
2021 Q4	$30K	Sell	118 -88	-43%	-$26.7K	﹤0.01%	7898
2021 Q3	$95K	Hold	206	–	–	﹤0.01%	6687
2021 Q2	$102K	Buy	206 +199	+2,843%	+$97.2K	﹤0.01%	6704
2021 Q1	$355K	Buy	+7	New	+$13.6K	﹤0.01%	3902
2020 Q4	–	Hold	0	–	–	–	5745

Other funds holding KRRO

LCM

Lynx1 Capital Management San Juan, Puerto Rico $866M AUM 231.68% 1-Year Est. Return

NMC

NEA Management Company Timonium, Maryland $1.59B AUM 234.06% 1-Year Est. Return

VR Adviser New York $3.3B AUM 525.74% 1-Year Est. Return

AVLSA

Atlas Venture Life Science Advisors Cambridge, Massachusetts $881M AUM 160.77% 1-Year Est. Return

Balyasny Asset Management Chicago, Illinois $80.2B AUM 51.53% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

AAA

Affinity Asset Advisors New York $2.21B AUM 431.26% 1-Year Est. Return

NCM

Nantahala Capital Management New Canaan, Connecticut $3.01B AUM 119.46% 1-Year Est. Return

Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return

ACM

ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return

Simplex Trading's KRRO Position: Q2 2026 in Review

Simplex Trading opened a new position in Korro Bio (KRRO) in Q2 2026: 1,975 shares worth $26K. The stake represents ﹤0.01% of the portfolio and ranks #6878 among its holdings. This is a return to the name: Simplex Trading previously reported a position in KRRO as recently as Q4 2025.

Simplex Trading first reported a position in KRRO in Q1 2021 and has held it in 7 quarters since. The position peaked at $419K in Q1 2021. 107 funds tracked by Wall St. Rank hold KRRO as of Q2 2026.

Simplex Trading held 1,975 shares of Korro Bio worth $26K as of Q2 2026.
Korro Bio was a new Simplex Trading position in Q2 2026.
Korro Bio made up ﹤0.01% of Simplex Trading's portfolio in Q2 2026, its #6878 holding.
Simplex Trading first reported a position in Korro Bio in Q1 2021 and has held it in 7 quarters since.
Simplex Trading's Korro Bio position peaked at $419K in Q1 2021.
107 funds tracked by Wall St. Rank held Korro Bio as of Q2 2026.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.