Marshall Wace’s Thermo Fisher Scientific TMO Stock Holding History

Marshall Wace’s Portfolio TMO Stock Details TMO Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$344K	Buy	+700	New	+$380K	﹤0.01%	2603
2025 Q3	–	Sell	-75,000	Closed	-$30.4M	–	3405
2025 Q2	$30.4M	Buy	+75,000	New	+$31.4M	0.03%	435
2024 Q3	–	Sell	-40,000	Closed	-$22.1M	–	2956
2024 Q2	$22.1M	Buy	+40,000	New	+$22.9M	0.03%	467
2021 Q4	–	Sell	-12,100	Closed	-$6.91M	–	4276
2021 Q3	$6.91M	Buy	12,100 +11,900	+5,950%	+$6.53M	0.03%	770
2021 Q2	$101K	Hold	200	–	–	﹤0.01%	2535
2021 Q1	$91K	Buy	+200	New	+$95.5K	﹤0.01%	2362

Other funds holding TMO

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

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

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

Franklin Resources San Mateo, California $408B AUM 30.18% 1-Year Est. Return

Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

Marshall Wace's TMO Position: Q1 2026 in Review

Marshall Wace reduced its Thermo Fisher Scientific (TMO) stake by 50% in Q1 2026, selling an estimated $259M and leaving 477,250 shares worth $235M. The position accounts for 0.23% of the portfolio, ranked #60.

Marshall Wace first reported a position in TMO in Q1 2014 and has held it in 34 quarters since. The position peaked at $696M in Q4 2021. 2,587 funds tracked by Wall St. Rank hold TMO as of Q1 2026.

Marshall Wace held 477,250 shares of Thermo Fisher Scientific worth $235M as of Q1 2026.
Marshall Wace sold 476,578 Thermo Fisher Scientific shares in Q1 2026, an estimated $259M.
Thermo Fisher Scientific made up 0.23% of Marshall Wace's portfolio in Q1 2026, its #60 holding.
Marshall Wace first reported a position in Thermo Fisher Scientific in Q1 2014 and has held it in 34 quarters since.
Marshall Wace's Thermo Fisher Scientific position peaked at $696M in Q4 2021.
2,587 funds tracked by Wall St. Rank held Thermo Fisher Scientific as of Q1 2026.

Based on Marshall Wace's 13F filing for Q1 2026, filed 15 May 2026.