Quadrant Capital Group Llc reports 10.04% increase in ownership of MASI / Masimo Corporation

마시모 코퍼레이션

MX ˙ BMV ˙ US5747951003

Security	MX:MASI / Masimo Corporation
Institution	Quadrant Capital Group Llc
Latest Disclosed Ownership	4,122 shares
Latest Disclosed Value	$ 733,181

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 4,122 shares of Masimo Corporation (MX:MASI) valued at $733,181 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 3,746 shares of Masimo Corporation. This represents a change in shares of 10.04% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)

File Date	Effective Date	Form	Security	Class	ID	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-13	2026-03-31	13F/A-1	MASIMO	COM	574795100	4,122	376	10.04	733	50.51	0.0219
2026-05-11	2026-03-31	13F	MASIMO	COM	574795100	4,122	376		49		0.0369
2026-02-12	2025-12-31	13F	MASIMO	COM	574795100	3,746	-1,135	-23.25	487	-32.36	0.0147
2025-11-13	2025-09-30	13F	MASIMO	COM	574795100	4,881	-100	-2.01	720	-13.98	0.0234
2025-08-13	2025-06-30	13F	MASIMO	COM	574795100	4,981	933	23.05	838	24.18	0.0302
2025-05-13	2025-03-31	13F	MASIMO	COM	574795100	4,048	2,640	187.50	674	190.52	0.0250
2025-02-13	2024-12-31	13F	MASIMO	COM	574795100	1,408	32	2.33	233	26.78	0.0160
2024-11-12	2024-09-30	13F	MASIMO	COM	574795100	1,376	-154	-10.07	183	-4.69	0.0127
2024-08-12	2024-06-30	13F	MASIMO	COM	574795100	1,530	130	9.29	193	-6.34	0.0143
2024-05-15	2024-03-31	13F	MASIMO	COM	574795100	1,400	11	0.79	206	26.54	0.0162
2024-02-08	2023-12-31	13F	MASIMO	COM	574795100	1,389	691	99.00	163	165.57	0.0140
2023-11-14	2023-09-30	13F	MASIMO	COM	574795100	698	-341	-32.82	61	-64.12	0.0061
2023-08-10	2023-06-30	13F	MASIMO	COM	574795100	1,039	-169	-13.99	171	-23.42	0.0170
2023-05-11	2023-03-31	13F	MASIMO	COM	574795100	1,208	150	14.18	223	42.31	0.0232
2023-02-13	2022-12-31	13F	MASIMO	COM	574795100	1,058	-138	-11.54	157	-7.69	0.0177
2022-11-10	2022-09-30	13F	MASIMO	COM	574795100	1,196	204	20.56	169	30.00	0.0223
2022-08-09	2022-06-30	13F	MASIMO	COM	574795100	992	663	201.52	130	170.83	0.0175
2022-05-06	2022-03-31	13F	MASIMO	COM	574795100	329	-34	-9.37	48	-54.72	0.0058
2022-02-01	2021-12-31	13F	MASIMO	COM	574795100	363	59	19.41	106	29.27	0.0126
2021-11-12	2021-09-30	13F	MASIMO	COM	574795100	304	14	4.83	82	17.14	0.0114
2021-08-09	2021-06-30	13F	MASIMO	COM	574795100	290	-40	-12.12	70	-7.89	0.0102
2021-05-12	2021-03-31	13F	MASIMO	COM	574795100	330	64	24.06	76	7.04	0.0123
2021-02-16	2020-12-31	13F	MASIMO	COM	574795100	266	14	5.56	71	20.34	0.0132
2020-11-13	2020-09-30	13F	MASIMO	COM	574795100	252	49	24.14	59	28.26	0.0129
2020-08-13	2020-06-30	13F	MASIMO	COM	574795100	203	-736	-78.38	46	-72.78	0.0102
2020-05-15	2020-03-31	13F	Masimo	Com	574795100	939	71	8.18	169	27.07	0.0283
2020-03-19	2019-12-31	13F/A-1	Masimo	Com	574795100	868	5	0.58	133	6.40	0.0160
2020-02-03	2019-12-31	13F	Masimo	Com	574795100	868	5		133		449.4244
2019-10-24	2019-09-30	13F	Masimo	COM	574795100	863	0	0.00	125	0.00	0.0192
2019-07-24	2019-06-30	13F	Masimo	COM	574795100	863	774	869.66	125	941.67	0.0198
2019-04-29	2019-03-31	13F	Masimo	COM	574795100	89	0	0.00	12	50.00	0.0021
2019-01-17	2018-12-31	13F	Masimo	COM	574795100	89	0	0.00	8	-11.11	0.0021
2018-10-29	2018-09-30	13F	Masimo	COM	574795100	89	0	0.00	9	28.57	0.0026
2018-08-08	2018-06-30	13F	Masimo	COM	574795100	89	0	0.00	7	16.67	0.0025
2018-05-10	2018-03-31	13F	Masimo	COM	574795100	89	0	0.00	6	0.00	0.0022
2018-01-31	2017-12-31	13F	Masimo	COM	574795100	89	0	0.00	6	0.00	0.0024
2017-10-13	2017-09-30	13F	Masimo	COM	574795100	89	22	32.84	6		0.0025
2017-08-14	2017-06-30	13F	Masimo	COM	574795100	67	0	0.00	0	-100.00
2017-04-10	2017-03-31	13F	Masimo	COM	574795100	67	0	0.00	5	25.00	0.0022
2017-01-11	2016-12-31	13F	Masimo	COM	574795100	67	0	0.00	4	33.33	0.0020
2016-10-25	2016-09-30	13F	Masimo	COM	574795100	67	0	0.00	3	50.00	0.0020
2016-07-28	2016-06-30	13F	Masimo	COM	574795100	67	30	81.08	2	100.00	0.0014
2016-04-27	2016-03-31	13F	Masimo	COM	574795100	37	37		1		0.0006

Legend

Shares: The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value: The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price: The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class: This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred

Allocation (%): The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation: The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%): The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis: The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss: This is the market value of the position as of the effective date minus the cost basis.