← Top Holdings

TMOThermo Fisher Scientific, Inc.

CUSIP: 883556102

Healthcare

🔥 Bought by 6 superinvestors this quarter

18

Guru Owners

$3.89B

Total Value Held

7.8M

Total Shares

Who owns TMO? Full holder list and ownership history →

📊 Holdings Over Time

How superinvestor ownership has changed across quarters

$0$877.9M$1.76B$2.63B$3.51BQ2 '23Q4 '23Q2 '24Q4 '24Q2 '25Q4 '25Q2 '26

Quarter-by-Quarter Activity

Q2 '2616 owners · $3.51B
INCREASEDDodge & Cox$1.53B
INCREASEDAndreas Halvorsen$971.3M
INCREASEDDan Sundheim$409.7M
REDUCEDLindsell Train$258.0M
INCREASEDSteven Romick$124.5M
NEWHarry Burn$82.9M
REDUCEDWallace Weitz$57.8M
INCREASEDTom Gayner$36.6M
INCREASEDDavid Katz$13.9M
NEWStanley Druckenmiller$9.6M
INCREASEDFPA Queens Road$7.7M
REDUCEDRay Dalio$6.5M
INCREASEDHillman Value Fund$376K
REDUCEDWally Obermeyer$327K
SOLDWilliam Von Mueffling
SOLDRobert Olstein
Q1 '2616 owners · $2.10B
REDUCEDAndreas Halvorsen$819.9M
REDUCEDWilliam Von Mueffling$378.3M
NEWDan Sundheim$356.4M
REDUCEDLindsell Train$303.4M
INCREASEDSteven Romick$109.1M
REDUCEDWallace Weitz$59.5M
INCREASEDTom Gayner$33.0M
INCREASEDDavid Katz$11.1M
INCREASEDFPA Queens Road$7.2M
REDUCEDRay Dalio$7.1M
INCREASEDRobert Olstein$3.3M
REDUCEDWally Obermeyer$342K
INCREASEDHillman Value Fund$322K
SOLDDaniel Loeb
SOLDPolen Capital
SOLDBill Nygren
Q4 '2518 owners · $1.68B
INCREASEDWilliam Von Mueffling$506.0M
NEWAndreas Halvorsen$459.6M
REDUCEDLindsell Train$399.5M
INCREASEDSteven Romick$126.7M
REDUCEDWallace Weitz$78.2M
INCREASEDTom Gayner$36.4M
NEWDaniel Loeb$29.0M
REDUCEDDavid Katz$12.4M
INCREASEDFPA Queens Road$8.1M
REDUCEDRobert Olstein$3.7M
INCREASEDPolen Capital$1.3M
NEWRay Dalio$977K
REDUCEDMairs & Power$719K
INCREASEDWally Obermeyer$416K
REDUCEDHillman Value Fund$367K
Q3 '2515 owners · $1.11B
REDUCEDWilliam Von Mueffling$420.4M
REDUCEDLindsell Train$396.5M
REDUCEDSteven Romick$104.3M
REDUCEDPolen Capital$55.5M
INCREASEDTom Gayner$27.1M
REDUCEDDodge & Cox$12.5M
INCREASEDDavid Katz$10.4M
REDUCEDFPA Queens Road$6.7M
REDUCEDWally Obermeyer$548K
NEWHillman Value Fund$398K
NEWBill Nygren$262K
NEWDan Sundheim (Mine & Arao)$201K
SOLDAKO Capital
SOLDStanley Druckenmiller
Q2 '2514 owners · $1.75B
REDUCEDPolen Capital$888.1M
REDUCEDWilliam Von Mueffling$355.3M
INCREASEDLindsell Train$346.5M
INCREASEDWallace Weitz$61.0M
NEWSteven Romick$35.4M
INCREASEDTom Gayner$20.1M
REDUCEDAKO Capital$10.7M
REDUCEDDodge & Cox$10.5M
INCREASEDDavid Katz$8.7M
INCREASEDFPA Queens Road$5.7M
NEWStanley Druckenmiller$4.9M
NEWRobert Olstein$3.2M
INCREASEDMairs & Power$655K
REDUCEDWally Obermeyer$463K
SOLDBoykin Curry
SOLDDan Sundheim (Mine & Arao)
SOLDTorray LLC
Q1 '2514 owners · $2.14B
NEWPolen Capital$1.16B
NEWWilliam Von Mueffling$448.7M
INCREASEDLindsell Train$253.2M
INCREASEDAKO Capital$165.6M
INCREASEDWallace Weitz$62.8M
INCREASEDTom Gayner$22.4M
REDUCEDDodge & Cox$13.0M
REDUCEDDavid Katz$7.8M
INCREASEDFPA Queens Road$6.7M
REDUCEDMairs & Power$650K
REDUCEDWally Obermeyer$573K
SOLDDaniel Loeb

🏛️ Congressional Trades

TMO: Held by 18 superinvestors · 50 congress member trades

SELLDan NewhouseR
$1,001 - $15,0002026-07-10
SELLDwight EvansD
$1,001 - $15,0002026-05-07
BUYRo KhannaD
$15,001 - $50,0002025-11-07
SELLLisa McClainR
$1,001 - $15,0002025-10-31
SELLLisa McClainR
$1,001 - $15,0002025-10-30
BUYLisa McClainR
$1,001 - $15,0002025-10-30
SELLValerie HoyleD
$1,001 - $15,0002025-09-23
SELLKelly MorrisonD
$1,001 - $15,0002025-08-19
SELLKelly Louise MorrisonD
$15,001 - $50,0002025-08-19
SELLKelly Louise MorrisonD
$1,001 - $15,0002025-08-19
SELLKelly MorrisonD
$15,001 - $50,0002025-08-19
BUYRo KhannaD
$1,001 - $15,0002025-08-06
BUYRo KhannaD
$15,001 - $50,0002025-08-04
BUYRo KhannaD
$1,001 - $15,0002025-07-30
BUYJulia LetlowR
$1,001 - $15,0002025-07-25
BUYLisa McClainR
$1,001 - $15,0002025-07-22
BUYRo KhannaD
$1,001 - $15,0002025-07-01
BUYRo KhannaD
$1,001 - $15,0002025-06-23
BUYRo KhannaD
$1,001 - $15,0002025-06-20
SELLLisa McClainR
$1,001 - $15,0002025-06-10