Boston Scientific Corporation
MX ˙ BMV ˙ FR0010424135
SecurityMX:BSX / Boston Scientific Corporation
InstitutionRathbone Brothers plc
Latest Disclosed Ownership3,179,435 shares
Latest Disclosed Value $ 199,509,546
Rathbone Brothers plc reports 15.21% increase in ownership of BSX / Boston Scientific Corporation

On May 12, 2026 - Rathbone Brothers plc filed a 13F-HR form disclosing ownership of 3,179,435 shares of Boston Scientific Corporation (MX:BSX) valued at $199,509,546 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 6, 2026 disclosing 2,759,657 shares of Boston Scientific Corporation. This represents a change in shares of 15.21% 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 Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-12 2026-03-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 3,179,435 419,778 15.21 199,510 -24.18 0.8524
2026-02-06 2025-12-31 13F/A-1 BOSTON SCIENTIFIC USD0.01 COM 101137107 2,759,657 477,680 20.93 263,133 18.11 1.0416
2026-01-21 2025-12-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,759,657 477,680 263,133 1.0416
2025-11-13 2025-09-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,281,977 31,529 1.40 222,789 -7.83 0.9046
2025-08-07 2025-06-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,250,448 -88,943 -3.80 241,721 2.43 1.0425
2025-05-13 2025-03-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,339,391 -56,187 -2.35 235,998 10.29 1.1404
2025-02-13 2024-12-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,395,578 -9,880 -0.41 213,973 6.15 1.0359
2024-11-13 2024-09-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,405,458 -1,728 -0.07 201,577 8.74 1.0172
2024-08-09 2024-06-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,407,186 53,770 2.28 185,377 15.01 1.0097
2024-05-14 2024-03-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,353,416 7,948 0.34 161,185 18.88 0.9302
2024-02-13 2023-12-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,345,468 82,646 3.65 135,592 13.49 0.8738
2023-11-13 2023-09-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,262,822 260,964 13.04 119,477 10.34 0.8664
2023-08-04 2023-06-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 2,001,858 556,884 38.54 108,280 49.78 1.0105
2023-05-12 2023-03-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 1,444,974 -3,022 -0.21 72,292 7.90 0.7391
2023-02-14 2022-12-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 1,447,996 -2,779 -0.19 66,999 19.24 0.7544
2022-11-14 2022-09-30 13F/A-1 BOSTON SCIENTIFIC USD0.01 COM 101137107 1,450,775 1,450,775 56,189 0.6933
2022-11-03 2022-09-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 1,450,775 1,450,775 56,189 0.6933
2022-02-10 2021-12-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 0 -6,245 -100.00 0 -100.00
2021-11-04 2021-09-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 6,245 6,245 271 0.0029
2021-05-14 2021-03-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 0 -23,745 -100.00 0 -100.00
2021-02-11 2020-12-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 23,745 -169,940 -87.74 854 -88.46 0.0121
2020-11-13 2020-09-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 193,685 -5,000 -2.52 7,401 6.09 0.1266
2020-08-07 2020-06-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 198,685 25,205 14.53 6,976 23.23 0.1416
2020-05-04 2020-03-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 173,480 -750,520 -81.23 5,661 -86.45 0.1649
2020-02-11 2019-12-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 924,000 109,979 13.51 41,783 26.14 1.0999
2019-11-13 2019-09-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 814,021 22,650 2.86 33,123 -2.62 0.9408
2019-08-12 2019-06-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 791,371 658,328 494.82 34,013 566.14 1.0649
2019-05-09 2019-03-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 133,043 3,151 2.43 5,106 11.24 0.1679
2019-02-12 2018-12-31 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 129,892 51,821 66.38 4,590 52.69 0.1759
2018-10-12 2018-09-30 13F BOSTON SCIENTIFIC USD0.01 COM 101137107 78,071 78,071 3,006 0.1021
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.