PDT Partners’s MKS Inc MKSI Stock Holding History

PDT Partners’s Portfolio MKSI Stock Details MKSI Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$17.6M	Buy	76,801 +66,731	+663%	+$15.1M	1.04%	5
2025 Q4	$1.61M	Hold	10,070	–	–	0.1%	286
2025 Q3	$1.25M	Buy	+10,070	New	+$1.07M	0.08%	326
2021 Q4	–	Sell	-1,600	Closed	-$241K	–	958
2021 Q3	$241K	Buy	+1,600	New	+$246K	0.02%	643
2020 Q4	–	Sell	-4,197	Closed	-$458K	–	788
2020 Q3	$458K	Buy	+4,197	New	+$492K	0.03%	464
2018 Q3	–	Sell	-111,254	Closed	-$10.6M	–	516
2018 Q2	$10.6M	Sell	111,254 -11,978	-10%	-$1.31M	0.4%	75
2018 Q1	$14.3M	Sell	123,232 -5,468	-4%	-$600K	0.48%	61
2017 Q4	$12.2M	Buy	128,700 +100	+0.1%	+$9.96K	0.35%	97
2017 Q3	$12.1M	Buy	128,600 +36,100	+39%	+$2.95M	0.4%	84
2017 Q2	$6.22M	Buy	92,500 +43,900	+90%	+$3.33M	0.25%	138
2017 Q1	$3.34M	Buy	48,600 +2,023	+4%	+$133K	0.18%	179
2016 Q4	$2.77M	Buy	+46,577	New	+$2.51M	0.18%	210
2015 Q2	–	Sell	-17,965	Closed	-$607K	–	1522
2015 Q1	$607K	Buy	+17,965	New	+$631K	0.02%	949

Other funds holding MKSI

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

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

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

Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

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

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

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

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

PDT Partners's MKSI Position: Q1 2026 in Review

PDT Partners increased its MKS Inc (MKSI) stake by 663% in Q1 2026, buying an estimated $15.1M and bringing the position to 76,801 shares worth $17.6M. The position accounts for 1.04% of the portfolio, ranked #5.

PDT Partners first reported a position in MKSI in Q1 2015 and has held it in 13 quarters since. 615 funds tracked by Wall St. Rank hold MKSI as of Q1 2026.

PDT Partners held 76,801 shares of MKS Inc worth $17.6M as of Q1 2026.
PDT Partners bought 66,731 MKS Inc shares in Q1 2026, an estimated $15.1M.
MKS Inc made up 1.04% of PDT Partners's portfolio in Q1 2026, its #5 holding.
PDT Partners first reported a position in MKS Inc in Q1 2015 and has held it in 13 quarters since.
615 funds tracked by Wall St. Rank held MKS Inc as of Q1 2026.

Based on PDT Partners's 13F filing for Q1 2026, filed 15 May 2026.