Rock Springs Capital Management’s Thermo Fisher Scientific TMO Stock Holding History

Rock Springs Capital Management’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	$4.92M	Hold	10,000	–	–	0.29%	67
2025 Q4	$5.79M	Hold	10,000	–	–	0.3%	66
2025 Q3	$4.85M	Hold	10,000	–	–	0.28%	66
2025 Q2	$4.05M	Buy	+10,000	New	+$4.18M	0.25%	67
2020 Q2	–	Sell	-17,500	Closed	-$4.96M	–	144
2020 Q1	$4.96M	Sell	17,500 -63,500	-78%	-$20M	0.21%	97
2019 Q4	$26.3M	Hold	81,000	–	–	0.83%	48
2019 Q3	$23.6M	Hold	81,000	–	–	0.94%	36
2019 Q2	$23.8M	Hold	81,000	–	–	0.86%	44
2019 Q1	$22.2M	Sell	81,000 -15,000	-16%	-$3.73M	0.85%	40
2018 Q4	$21.5M	Hold	96,000	–	–	1.01%	29
2018 Q3	$23.4M	Hold	96,000	–	–	0.85%	38
2018 Q2	$19.9M	Sell	96,000 -18,500	-16%	-$3.93M	0.77%	41
2018 Q1	$23.6M	Buy	114,500 +4,500	+4%	+$945K	1.01%	31
2017 Q4	$20.9M	Hold	110,000	–	–	0.95%	33
2017 Q3	$20.8M	Hold	110,000	–	–	0.96%	31
2017 Q2	$19.2M	Buy	+110,000	New	+$18.5M	0.97%	34
2016 Q3	–	Sell	-100,200	Closed	-$14.8M	–	140
2016 Q2	$14.8M	Hold	100,200	–	–	1.1%	26
2016 Q1	$14.2M	Buy	100,200 +200	+0.2%	+$26.8K	1.19%	25
2015 Q4	$14.2M	Hold	100,000	–	–	1.07%	28
2015 Q3	$12.2M	Hold	100,000	–	–	0.99%	32
2015 Q2	$13M	Hold	100,000	–	–	0.95%	34
2015 Q1	$13.4M	Buy	+100,000	New	+$12.9M	1.26%	27
2014 Q4	–	Sell	-108,500	Closed	-$13.2M	–	100
2014 Q3	$13.2M	Buy	108,500 +500	+0.5%	+$60.8K	2.04%	13
2014 Q2	$12.7M	Buy	108,000 +750	+0.7%	+$88.3K	2.29%	13
2014 Q1	$12.9M	Buy	107,250 +39,750	+59%	+$4.73M	2.97%	10
2013 Q4	$7.52M	Buy	+67,500	New	+$6.71M	2.69%	12

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

Rock Springs Capital Management's TMO Position: Q1 2026 in Review

Rock Springs Capital Management held its Thermo Fisher Scientific (TMO) position steady in Q1 2026 at 10,000 shares worth $4.92M. The position accounts for 0.29% of the portfolio, ranked #67.

Rock Springs Capital Management first reported a position in TMO in Q4 2013 and has held it in 26 quarters since. The position peaked at $26.3M in Q4 2019. 2,590 funds tracked by Wall St. Rank hold TMO as of Q1 2026.

Rock Springs Capital Management held 10,000 shares of Thermo Fisher Scientific worth $4.92M as of Q1 2026.
Rock Springs Capital Management left its Thermo Fisher Scientific share count unchanged in Q1 2026.
Thermo Fisher Scientific made up 0.29% of Rock Springs Capital Management's portfolio in Q1 2026, its #67 holding.
Rock Springs Capital Management first reported a position in Thermo Fisher Scientific in Q4 2013 and has held it in 26 quarters since.
Rock Springs Capital Management's Thermo Fisher Scientific position peaked at $26.3M in Q4 2019.
2,590 funds tracked by Wall St. Rank held Thermo Fisher Scientific as of Q1 2026.

Based on Rock Springs Capital Management's 13F filing for Q1 2026, filed 15 May 2026.