Renaissance Technologies’s Masimo MASI Stock Holding History

Renaissance Technologies’s Portfolio MASI Stock Details MASI Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$42.6M	Buy	239,500 +179,600	+300%	+$28.2M	0.07%	366
2025 Q4	$7.79M	Buy	+59,900	New	+$8.58M	0.01%	1049
2025 Q3	–	Sell	-25,377	Closed	-$4.27M	–	3743
2025 Q2	$4.27M	Buy	25,377 +10,377	+69%	+$1.66M	0.01%	1626
2025 Q1	$2.5M	Buy	+15,000	New	+$2.6M	﹤0.01%	1868
2023 Q3	–	Sell	-41,230	Closed	-$6.78M	–	3921
2023 Q2	$6.78M	Sell	41,230 -40,070	-49%	-$6.98M	0.01%	1242
2023 Q1	$15M	Sell	81,300 -98,400	-55%	-$16.6M	0.02%	872
2022 Q4	$26.6M	Buy	179,700 +131,900	+276%	+$18.1M	0.04%	587
2022 Q3	$6.75M	Buy	+47,800	New	+$6.98M	0.01%	1259
2022 Q1	–	Sell	-6,200	Closed	-$1.81M	–	4318
2021 Q4	$1.81M	Buy	+6,200	New	+$1.77M	﹤0.01%	2218
2021 Q2	–	Sell	-1,100	Closed	-$253K	–	3658
2021 Q1	$253K	Buy	+1,100	New	+$276K	﹤0.01%	3099
2020 Q4	–	Sell	-82,600	Closed	-$19.5M	–	3585
2020 Q3	$19.5M	Buy	82,600 +67,700	+454%	+$15.2M	0.02%	749
2020 Q2	$3.4M	Sell	14,900 -4,100	-22%	-$900K	﹤0.01%	1862
2020 Q1	$3.37M	Sell	19,000 -7,021	-27%	-$1.2M	﹤0.01%	1785
2019 Q4	$4.11M	Sell	26,021 -78,679	-75%	-$11.8M	﹤0.01%	1979
2019 Q3	$15.6M	Sell	104,700 -169,300	-62%	-$25.7M	0.01%	1106
2019 Q2	$40.8M	Sell	274,000 -71,000	-21%	-$9.74M	0.04%	576
2019 Q1	$47.7M	Sell	345,000 -193,300	-36%	-$24.3M	0.04%	534
2018 Q4	$57.8M	Buy	538,300 +235,500	+78%	+$26.3M	0.06%	362
2018 Q3	$37.7M	Sell	302,800 -249,826	-45%	-$27.7M	0.04%	573
2018 Q2	$54M	Buy	552,626 +41,126	+8%	+$3.91M	0.06%	412
2018 Q1	$45M	Sell	511,500 -40,600	-7%	-$3.54M	0.05%	479
2017 Q4	$46.8M	Sell	552,100 -131,300	-19%	-$11.4M	0.05%	479
2017 Q3	$59.2M	Buy	683,400 +62,900	+10%	+$5.56M	0.07%	354
2017 Q2	$56.6M	Buy	620,500 +191,400	+45%	+$17.6M	0.07%	336
2017 Q1	$40M	Buy	429,100 +255,700	+147%	+$21.1M	0.06%	435
2016 Q4	$11.7M	Buy	173,400 +94,900	+121%	+$5.83M	0.02%	1117
2016 Q3	$4.67M	Sell	78,500 -65,300	-45%	-$3.68M	0.01%	1639
2016 Q2	$7.55M	Sell	143,800 -88,900	-38%	-$4.19M	0.01%	1322
2016 Q1	$9.74M	Buy	232,700 +10,300	+5%	+$387K	0.02%	1155
2015 Q4	$9.23M	Buy	222,400 +109,200	+96%	+$4.46M	0.02%	1045
2015 Q3	$4.37M	Sell	113,200 -42,400	-27%	-$1.73M	0.01%	1485
2015 Q2	$6.03M	Buy	155,600 +12,900	+9%	+$462K	0.01%	1322
2015 Q1	$4.71M	Buy	142,700 +42,600	+43%	+$1.22M	0.01%	1405
2014 Q4	$2.64M	Sell	100,100 -236,100	-70%	-$5.83M	0.01%	1658
2014 Q3	$7.15M	Buy	336,200 +73,965	+28%	+$1.69M	0.02%	975
2014 Q2	$6.19M	Buy	+262,235	New	+$6.5M	0.01%	1102
2013 Q4	–	Sell	-60,600	Closed	-$1.61M	–	2949
2013 Q3	$1.61M	Sell	60,600 -396,600	-87%	-$9.78M	﹤0.01%	1778
2013 Q2	$9.69M	Buy	+457,200	New	+$9.62M	0.03%	753

Other funds holding MASI

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

PCM

Politan Capital Management New York $985M AUM 3.12% 1-Year Est. Return

PCM

Pentwater Capital Management Naples, Florida $19.3B AUM 58.13% 1-Year Est. Return

Barclays London, United Kingdom $416B AUM 33.63% 1-Year Est. Return

HBK Investments Dallas, Texas $9.85B AUM 55.6% 1-Year Est. Return

Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

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

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

Renaissance Technologies's MASI Position: Q1 2026 in Review

Renaissance Technologies increased its Masimo (MASI) stake by 300% in Q1 2026, buying an estimated $28.2M and bringing the position to 239,500 shares worth $42.6M. The position accounts for 0.07% of the portfolio, ranked #366.

Renaissance Technologies first reported a position in MASI in Q2 2013 and has held it in 38 quarters since. The position peaked at $59.2M in Q3 2017. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

Renaissance Technologies held 239,500 shares of Masimo worth $42.6M as of Q1 2026.
Renaissance Technologies bought 179,600 Masimo shares in Q1 2026, an estimated $28.2M.
Masimo made up 0.07% of Renaissance Technologies's portfolio in Q1 2026, its #366 holding.
Renaissance Technologies first reported a position in Masimo in Q2 2013 and has held it in 38 quarters since.
Renaissance Technologies's Masimo position peaked at $59.2M in Q3 2017.
445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Renaissance Technologies's 13F filing for Q1 2026, filed 14 May 2026.