Citadel Advisors’s iSpecimen ISPC Stock Holding History

Citadel Advisors’s Portfolio ISPC Stock Details ISPC Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$7.92K	Buy	+1,262	New	+$14.2K	﹤0.01%	12782
2025 Q3	–	Sell	-487	Closed	-$19.1K	–	13423
2025 Q2	$19.1K	Buy	+487	New	+$22.7K	﹤0.01%	12114
2024 Q3	–	Sell	-32	Closed	-$7.88K	–	14721
2024 Q2	$7.88K	Buy	+32	New	+$7.67K	﹤0.01%	13225
2024 Q1	–	Sell	-49	Closed	-$19.4K	–	15013
2023 Q4	$19.4K	Buy	+49	New	+$21.3K	﹤0.01%	12639
2023 Q3	–	Sell	-29	Closed	-$33.1K	–	14677
2023 Q2	$33.1K	Buy	+29	New	+$33.8K	﹤0.01%	12254
2022 Q3	–	Sell	-25	Closed	-$43K	–	13096
2022 Q2	$43K	Buy	+25	New	+$61.2K	﹤0.01%	12022
2021 Q4	–	Sell	-16	Closed	-$74K	–	14279
2021 Q3	$74K	Buy	+16	New	+$77.7K	﹤0.01%	13122

Other funds holding ISPC

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Jane Street New York $777B AUM 61.18% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

VFT

Vanguard Fiduciary Trust Malvern, Pennsylvania $396B AUM

StoneX Group New York $1.86B AUM 21.3% 1-Year Est. Return

TRCT

Tower Research Capital (TRC) New York $3.85B AUM 32.11% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

SBI Securities Tokyo, Japan $4.4B AUM 74.25% 1-Year Est. Return

GCP

Gill Capital Partners Denver, Colorado $348M AUM 14.74% 1-Year Est. Return

Citadel Advisors's ISPC Position: Q1 2026 in Review

Citadel Advisors opened a new position in iSpecimen (ISPC) in Q1 2026: 1,262 shares worth $7.92K. The stake represents ﹤0.01% of the portfolio and ranks #12782 among its holdings. This is a return to the name: Citadel Advisors previously reported a position in ISPC as recently as Q2 2025.

Citadel Advisors first reported a position in ISPC in Q3 2021 and has held it in 7 quarters since. The position peaked at $74K in Q3 2021. 9 funds tracked by Wall St. Rank hold ISPC as of Q1 2026.

Citadel Advisors held 1,262 shares of iSpecimen worth $7.92K as of Q1 2026.
iSpecimen was a new Citadel Advisors position in Q1 2026.
iSpecimen made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #12782 holding.
Citadel Advisors first reported a position in iSpecimen in Q3 2021 and has held it in 7 quarters since.
Citadel Advisors's iSpecimen position peaked at $74K in Q3 2021.
9 funds tracked by Wall St. Rank held iSpecimen as of Q1 2026.

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