D.E. Shaw & Co
MASI

D.E. Shaw & Co’s Masimo MASI Stock Holding History

D.E. Shaw & Co’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 		$3.52M Sell
19,789
-46,227
-70% -$7.26M ﹤0.01% 2449
2025
Q4 		$8.59M Buy
+66,016
New +$9.45M ﹤0.01% 1884
2024
Q4 		– Sell
-24,358
Closed -$3.25M – 4667
2024
Q3 		$3.25M Buy
+24,358
New +$2.83M ﹤0.01% 2314
2023
Q3 		– Sell
-51,937
Closed -$8.55M – 4389
2023
Q2 		$8.55M Sell
51,937
-147,751
-74% -$25.7M 0.01% 1469
2023
Q1 		$36.9M Sell
199,688
-82,684
-29% -$13.9M 0.04% 558
2022
Q4 		$41.8M Sell
282,372
-112,280
-28% -$15.4M 0.05% 508
2022
Q3 		$55.7M Sell
394,652
-251,037
-39% -$36.7M 0.07% 352
2022
Q2 		$84.4M Sell
645,689
-70,914
-10% -$9.49M 0.1% 228
2022
Q1 		$104M Buy
716,603
+701,622
+4,683% +$135M 0.1% 222
2021
Q4 		$4.39M Buy
14,981
+13,715
+1,083% +$3.91M ﹤0.01% 2524
2021
Q3 		$343K Buy
+1,266
New +$343K ﹤0.01% 4286
2020
Q4 		– Sell
-1,036
Closed -$245K – 4053
2020
Q3 		$245K Sell
1,036
-1,633
-61% -$366K ﹤0.01% 3541
2020
Q2 		$608K Sell
2,669
-811
-23% -$178K ﹤0.01% 3236
2020
Q1 		$616K Sell
3,480
-25,876
-88% -$4.44M ﹤0.01% 3090
2019
Q4 		$4.64M Sell
29,356
-14,260
-33% -$2.14M 0.01% 1795
2019
Q3 		$6.49M Sell
43,616
-59,418
-58% -$9.03M 0.01% 1448
2019
Q2 		$15.3M Sell
103,034
-119,214
-54% -$16.4M 0.02% 897
2019
Q1 		$30.7M Sell
222,248
-55,741
-20% -$7M 0.04% 533
2018
Q4 		$29.8M Sell
277,989
-107,302
-28% -$12M 0.04% 527
2018
Q3 		$48M Buy
385,291
+68,582
+22% +$7.61M 0.06% 422
2018
Q2 		$30.9M Buy
316,709
+192,492
+155% +$18.3M 0.04% 529
2018
Q1 		$10.9M Buy
124,217
+32,953
+36% +$2.87M 0.01% 950
2017
Q4 		$7.74M Sell
91,264
-11,850
-11% -$1.03M 0.01% 1194
2017
Q3 		$8.93M Sell
103,114
-156,944
-60% -$13.9M 0.01% 1017
2017
Q2 		$23.7M Buy
260,058
+35,976
+16% +$3.3M 0.04% 527
2017
Q1 		$20.9M Sell
224,082
-255,654
-53% -$21M 0.04% 549
2016
Q4 		$32.3M Sell
479,736
-111,898
-19% -$6.88M 0.05% 442
2016
Q3 		$35.2M Buy
591,634
+11,928
+2% +$673K 0.06% 394
2016
Q2 		$30.4M Buy
579,706
+174,590
+43% +$8.22M 0.06% 407
2016
Q1 		$16.9M Sell
405,116
-130,997
-24% -$4.93M 0.03% 610
2015
Q4 		$22.3M Sell
536,113
-100,533
-16% -$4.11M 0.03% 592
2015
Q3 		$24.5M Sell
636,646
-50,306
-7% -$2.06M 0.04% 548
2015
Q2 		$26.6M Buy
686,952
+105,938
+18% +$3.8M 0.04% 523
2015
Q1 		$19.2M Buy
581,014
+16,810
+3% +$483K 0.03% 616
2014
Q4 		$14.9M Buy
564,204
+201,554
+56% +$4.97M 0.02% 867
2014
Q3 		$7.72M Buy
362,650
+138,188
+62% +$3.15M 0.01% 1257
2014
Q2 		$5.3M Buy
224,462
+139,949
+166% +$3.47M 0.01% 1577
2014
Q1 		$2.31M Buy
84,513
+38,940
+85% +$1.11M ﹤0.01% 2245
2013
Q4 		$1.33M Sell
45,573
-6,970
-13% -$195K ﹤0.01% 2911
2013
Q3 		$1.4M Buy
52,543
+20,032
+62% +$494K ﹤0.01% 2744
2013
Q2 		$689K Buy
+32,511
New +$684K ﹤0.01% 3000

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

D.E. Shaw & Co's MASI Position: Q1 2026 in Review

D.E. Shaw & Co reduced its Masimo (MASI) stake by 70% in Q1 2026, selling an estimated $7.26M and leaving 19,789 shares worth $3.52M. The position accounts for ﹤0.01% of the portfolio, ranked #2449.

D.E. Shaw & Co first reported a position in MASI in Q2 2013 and has held it in 41 quarters since. The position peaked at $104M in Q1 2022. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • D.E. Shaw & Co held 19,789 shares of Masimo worth $3.52M as of Q1 2026.
  • D.E. Shaw & Co sold 46,227 Masimo shares in Q1 2026, an estimated $7.26M.
  • Masimo made up ﹤0.01% of D.E. Shaw & Co's portfolio in Q1 2026, its #2449 holding.
  • D.E. Shaw & Co first reported a position in Masimo in Q2 2013 and has held it in 41 quarters since.
  • D.E. Shaw & Co's Masimo position peaked at $104M in Q1 2022.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on D.E. Shaw & Co's 13F filing for Q1 2026, filed 15 May 2026.