American Century Companies’s Masimo MASI Stock Holding History

American Century Companies’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	$33.5M	Buy	188,073 +9,315	+5%	+$1.46M	0.02%	940
2025 Q4	$23.2M	Buy	178,758 +10,417	+6%	+$1.49M	0.01%	1095
2025 Q3	$24.8M	Buy	168,341 +16,113	+11%	+$2.44M	0.01%	1029
2025 Q2	$25.6M	Buy	152,228 +73,052	+92%	+$11.7M	0.01%	970
2025 Q1	$13.2M	Buy	79,176 +66,517	+525%	+$11.5M	0.01%	1220
2024 Q4	$2.09M	Buy	12,659 +1,374	+12%	+$217K	﹤0.01%	1975
2024 Q3	$1.5M	Buy	11,285 +614	+6%	+$71.2K	﹤0.01%	2079
2024 Q2	$1.34M	Buy	10,671 +1,671	+19%	+$220K	﹤0.01%	2055
2024 Q1	$1.32M	Buy	9,000 +3,412	+61%	+$441K	﹤0.01%	2040
2023 Q4	$655K	Buy	5,588 +375	+7%	+$35K	﹤0.01%	2260
2023 Q3	$457K	Buy	5,213 +111	+2%	+$12.9K	﹤0.01%	2307
2023 Q2	$840K	Buy	5,102 +144	+3%	+$25.1K	﹤0.01%	2014
2023 Q1	$885K	Buy	4,958 +19	+0.4%	+$3.21K	﹤0.01%	1912
2022 Q4	$731K	Buy	4,939 +1,240	+34%	+$171K	﹤0.01%	1913
2022 Q3	$522K	Buy	3,699 +1,059	+40%	+$155K	﹤0.01%	1938
2022 Q2	$345K	Sell	2,640 -6,159	-70%	-$824K	﹤0.01%	2027
2022 Q1	$1.28M	Buy	8,799 +194	+2%	+$37.2K	﹤0.01%	1579
2021 Q4	$2.52M	Buy	8,605 +660	+8%	+$188K	﹤0.01%	1280
2021 Q3	$2.15M	Buy	7,945 +653	+9%	+$177K	﹤0.01%	1290
2021 Q2	$1.77M	Buy	7,292 +577	+9%	+$132K	﹤0.01%	1312
2021 Q1	$1.54M	Sell	6,715 -23,347	-78%	-$5.86M	﹤0.01%	1262
2020 Q4	$8.07M	Sell	30,062 -404,483	-93%	-$101M	0.01%	800
2020 Q3	$103M	Buy	434,545 +25,280	+6%	+$5.67M	0.09%	247
2020 Q2	$93.3M	Sell	409,265 -93,331	-19%	-$20.5M	0.09%	249
2020 Q1	$89M	Sell	502,596 -8,903	-2%	-$1.53M	0.11%	230
2019 Q4	$80.8M	Buy	511,499 +7,489	+1%	+$1.13M	0.08%	269
2019 Q3	$75M	Buy	504,010 +572	+0.1%	+$86.9K	0.08%	288
2019 Q2	$74.9M	Sell	503,438 -26,631	-5%	-$3.65M	0.07%	297
2019 Q1	$73.3M	Sell	530,069 -217,302	-29%	-$27.3M	0.07%	301
2018 Q4	$80.2M	Sell	747,371 -103,065	-12%	-$11.5M	0.09%	267
2018 Q3	$106M	Buy	850,436 +768,078	+933%	+$85.2M	0.1%	249
2018 Q2	$8.04M	Sell	82,358 -262,770	-76%	-$25M	0.01%	717
2018 Q1	$30.4M	Sell	345,128 -241,942	-41%	-$21.1M	0.03%	443
2017 Q4	$49.8M	Buy	587,070 +110,107	+23%	+$9.55M	0.05%	374
2017 Q3	$41.3M	Buy	476,963 +267,489	+128%	+$23.7M	0.04%	403
2017 Q2	$19.1M	Buy	209,474 +103,656	+98%	+$9.52M	0.02%	529
2017 Q1	$9.87M	Sell	105,818 -6,631	-6%	-$546K	0.01%	675
2016 Q4	$7.58M	Buy	112,449 +22,814	+25%	+$1.4M	0.01%	735
2016 Q3	$5.33M	Buy	+89,635	New	+$5.06M	0.01%	859
2014 Q4	–	Sell	-40,864	Closed	-$870K	–	1438
2014 Q3	$870K	Buy	40,864 +324	+0.8%	+$7.4K	﹤0.01%	1208
2014 Q2	$957K	Buy	40,540 +220	+0.5%	+$5.46K	﹤0.01%	1227
2014 Q1	$1.1M	Sell	40,320 -2,960	-7%	-$84.4K	﹤0.01%	1206
2013 Q4	$1.26M	Sell	43,280 -210	-0.5%	-$5.88K	﹤0.01%	1199
2013 Q3	$1.16M	Buy	43,490 +2,640	+6%	+$65.1K	﹤0.01%	1191
2013 Q2	$866K	Buy	+40,850	New	+$859K	﹤0.01%	1227

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

American Century Companies's MASI Position: Q1 2026 in Review

American Century Companies increased its Masimo (MASI) stake by 5.2% in Q1 2026, buying an estimated $1.46M and bringing the position to 188,073 shares worth $33.5M. The position accounts for 0.02% of the portfolio, ranked #940.

American Century Companies first reported a position in MASI in Q2 2013 and has held it in 45 quarters since. The position peaked at $106M in Q3 2018. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

American Century Companies held 188,073 shares of Masimo worth $33.5M as of Q1 2026.
American Century Companies bought 9,315 Masimo shares in Q1 2026, an estimated $1.46M.
Masimo made up 0.02% of American Century Companies's portfolio in Q1 2026, its #940 holding.
American Century Companies first reported a position in Masimo in Q2 2013 and has held it in 45 quarters since.
American Century Companies's Masimo position peaked at $106M in Q3 2018.
445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on American Century Companies's 13F filing for Q1 2026, filed 15 May 2026.