California State Teachers Retirement System (CalSTRS)
MASI

California State Teachers Retirement System (CalSTRS)’s Masimo MASI Stock Holding History

California State Teachers Retirement System (CalSTRS)’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 		$9.48M Buy
53,287
+9,464
+22% +$1.49M 0.01% 713
2025
Q4 		$5.7M Buy
43,823
+468
+1% +$67K 0.01% 861
2025
Q3 		$6.4M Buy
43,355
+2
+0% +$303 0.01% 805
2025
Q2 		$7.29M Buy
43,353
+101
+0.2% +$16.1K 0.01% 734
2025
Q1 		$7.21M Buy
43,252
+869
+2% +$151K 0.01% 708
2024
Q4 		$7.01M Sell
42,383
-229
-0.5% -$36.2K 0.01% 749
2024
Q3 		$5.68M Sell
42,612
-1,149
-3% -$133K 0.01% 857
2024
Q2 		$5.51M Sell
43,761
-1,032
-2% -$136K 0.01% 847
2024
Q1 		$6.58M Sell
44,793
-2,364
-5% -$305K 0.01% 801
2023
Q4 		$5.53M Sell
47,157
-2,124
-4% -$198K 0.01% 858
2023
Q3 		$4.32M Sell
49,281
-23,462
-32% -$2.73M 0.01% 955
2023
Q2 		$12M Sell
72,743
-9,712
-12% -$1.69M 0.02% 609
2023
Q1 		$15.2M Sell
82,455
-699
-0.8% -$118K 0.02% 549
2022
Q4 		$12.3M Sell
83,154
-2,853
-3% -$393K 0.02% 590
2022
Q3 		$12.1M Sell
86,007
-1,703
-2% -$249K 0.02% 582
2022
Q2 		$11.5M Buy
87,710
+2,570
+3% +$344K 0.02% 605
2022
Q1 		$12.4M Sell
85,140
-5,069
-6% -$973K 0.02% 644
2021
Q4 		$26.4M Buy
90,209
+2,243
+3% +$639K 0.03% 481
2021
Q3 		$23.8M Sell
87,966
-301
-0.3% -$81.6K 0.03% 490
2021
Q2 		$21.4M Sell
88,267
-3,124
-3% -$713K 0.03% 541
2021
Q1 		$21M Buy
91,391
+919
+1% +$231K 0.03% 533
2020
Q4 		$24.3M Buy
90,472
+2,091
+2% +$521K 0.03% 460
2020
Q3 		$20.9M Buy
88,381
+3,336
+4% +$748K 0.03% 442
2020
Q2 		$19.4M Buy
85,045
+5,105
+6% +$1.12M 0.03% 437
2020
Q1 		$14.2M Sell
79,940
-2,105
-3% -$361K 0.03% 454
2019
Q4 		$13M Buy
82,045
+6,210
+8% +$934K 0.02% 592
2019
Q3 		$11.3M Buy
75,835
+903
+1% +$137K 0.02% 617
2019
Q2 		$11.2M Buy
74,932
+1,903
+3% +$261K 0.02% 624
2019
Q1 		$10.1M Buy
73,029
+286
+0.4% +$35.9K 0.02% 648
2018
Q4 		$7.81M Buy
72,743
+3,347
+5% +$373K 0.02% 700
2018
Q3 		$8.64M Sell
69,396
-24
-0% -$2.66K 0.02% 744
2018
Q2 		$6.78M Buy
69,420
+1,099
+2% +$104K 0.01% 837
2018
Q1 		$6.01M Sell
68,321
-2,396
-3% -$209K 0.01% 861
2017
Q4 		$6M Sell
70,717
-1,117
-2% -$96.9K 0.01% 891
2017
Q3 		$6.22M Sell
71,834
-7,601
-10% -$672K 0.01% 864
2017
Q2 		$7.24M Sell
79,435
-1,065
-1% -$97.8K 0.02% 815
2017
Q1 		$7.51M Sell
80,500
-3,800
-5% -$313K 0.02% 828
2016
Q4 		$5.68M Sell
84,300
-2,200
-3% -$135K 0.01% 1000
2016
Q3 		$5.15M Buy
86,500
+700
+0.8% +$39.5K 0.01% 1048
2016
Q2 		$4.51M Sell
85,800
-7,068
-8% -$333K 0.01% 1082
2016
Q1 		$3.89M Buy
92,868
+11,806
+15% +$444K 0.01% 1182
2015
Q4 		$3.37M Buy
81,062
+1,288
+2% +$52.6K 0.01% 1197
2015
Q3 		$3.08M Sell
79,774
-100
-0.1% -$4.09K 0.01% 1239
2015
Q2 		$3.09M Sell
79,874
-2,009
-2% -$72K 0.01% 1328
2015
Q1 		$2.7M Sell
81,883
-1,400
-2% -$40.2K 0.01% 1400
2014
Q4 		$2.19M Sell
83,283
-29,907
-26% -$738K 0.01% 1553
2014
Q3 		$2.41M Buy
113,190
+24,796
+28% +$566K 0.01% 1438
2014
Q2 		$2.09M Sell
88,394
-200
-0.2% -$4.96K 0.01% 1573
2014
Q1 		$2.42M Buy
88,594
+400
+0.5% +$11.4K 0.01% 1404
2013
Q4 		$2.58M Buy
88,194
+600
+0.7% +$16.8K 0.01% 1344
2013
Q3 		$2.33M Buy
87,594
+2,711
+3% +$66.8K 0.01% 1370
2013
Q2 		$1.8M Buy
+84,883
New +$1.79M 0.01% 1466

Other funds holding MASI

BlackRock
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
Barclays London, United Kingdom $416B AUM 33.63% 1-Year Est. Return
HI
HBK Investments Dallas, Texas $9.85B AUM 55.6% 1-Year Est. Return
Massachusetts Financial Services
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
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

California State Teachers Retirement System (CalSTRS)'s MASI Position: Q1 2026 in Review

California State Teachers Retirement System (CalSTRS) increased its Masimo (MASI) stake by 22% in Q1 2026, buying an estimated $1.49M and bringing the position to 53,287 shares worth $9.48M. The position accounts for 0.01% of the portfolio, ranked #713.

California State Teachers Retirement System (CalSTRS) first reported a position in MASI in Q2 2013 and has held it in 52 quarters since. The position peaked at $26.4M in Q4 2021. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • California State Teachers Retirement System (CalSTRS) held 53,287 shares of Masimo worth $9.48M as of Q1 2026.
  • California State Teachers Retirement System (CalSTRS) bought 9,464 Masimo shares in Q1 2026, an estimated $1.49M.
  • Masimo made up 0.01% of California State Teachers Retirement System (CalSTRS)'s portfolio in Q1 2026, its #713 holding.
  • California State Teachers Retirement System (CalSTRS) first reported a position in Masimo in Q2 2013 and has held it in 52 quarters since.
  • California State Teachers Retirement System (CalSTRS)'s Masimo position peaked at $26.4M in Q4 2021.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on California State Teachers Retirement System (CalSTRS)'s 13F filing for Q1 2026, filed 18 May 2026.