Boston Scientific Corporation
MX ˙ BMV ˙ FR0010424135
SecurityMX:BSX / Boston Scientific Corporation
InstitutionToronto Dominion Bank
Latest Disclosed Ownership448,198 shares
Latest Disclosed Value $ 28,125,810
Toronto Dominion Bank ownership in BSX / Boston Scientific Corporation

On May 15, 2026 - Toronto Dominion Bank filed a 13F-HR form disclosing ownership of 448,198 shares of Boston Scientific Corporation (MX:BSX) valued at $28,125,810 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,024,051 shares of Boston Scientific Corporation. This represents a change in shares of -56.23% during the quarter.

Toronto Dominion Bank has a history of taking positions in derivatives of the underlying security (BSX) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:BSX / Boston Scientific Corporation Historical Put/Call Ratio
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)
2026-05-15 2026-03-31 13F BOSTON SCIENTIFIC COM 101137107 448,198 -575,853 -56.23 28,126 -71.20 0.0145
2026-02-17 2025-12-31 13F BOSTON SCIENTIFIC COM 101137107 1,024,051 470,096 84.86 97,642 80.56 0.1441
2025-11-14 2025-09-30 13F Boston Scientific COM 101137107 553,955 -52,079 -8.59 54,077 -16.93 0.0838
2025-08-14 2025-06-30 13F BOSTON SCIENTIFIC COM 101137107 606,034 -280,406 -31.63 65,095 -27.21 0.1080
2025-05-15 2025-03-31 13F BOSTON SCIENTIFIC COM 101137107 886,440 89,491 11.23 89,424 25.63 0.1752
2025-02-19 2024-12-31 13F/A-1 BOSTON SCIENTIFIC COM 101137107 796,949 54,022 7.27 71,183 14.34 0.1124
2025-02-14 2024-12-31 13F BOSTON SCIENTIFIC COM 101137107 803,749 60,822 71,790 0.0348
2024-11-18 2024-09-30 13F/A-1 Boston Scientific COM 101137107 742,927 -185,171 -19.95 62,257 -12.89 0.1101
2024-11-14 2024-09-30 13F Boston Scientific COM 101137107 742,927 -185,171 62,257 0.0044
2024-08-14 2024-06-30 13F Boston Scientific COM 101137107 928,098 177,006 23.57 71,473 38.94 0.1146
2024-05-14 2024-03-31 13F Boston Scientific COM 101137107 751,092 -94,729 -11.20 51,442 5.21 0.0806
2024-02-13 2023-12-31 13F Boston Scientific COM 101137107 845,821 -226,903 -21.15 48,897 -13.67 0.0709
2024-02-14 2023-09-30 13F/A-1 Boston Scientific COM 101137107 1,072,724 -145,593 -11.95 56,640 87,036.92 0.0937
2023-11-14 2023-09-30 13F Boston Scientific COM 101137107 1,072,724 -145,593 56,640 0.0037
2024-02-14 2023-06-30 13F/A-1 Boston Scientific COM 101137107 1,218,317 -17,059 -1.38 66 6.56 0.0977
2023-08-10 2023-06-30 13F Boston Scientific COM 101137107 1,218,317 -17,059 66 0.0980
2023-05-11 2023-03-31 13F Boston Scientific COM 101137107 1,235,376 63,601 5.43 62 12.96 0.1007
2023-02-07 2022-12-31 13F Boston Scientific COM 101137107 1,171,775 -229,661 -16.39 54 -99.90 0.0811
2022-11-09 2022-09-30 13F Boston Scientific COM 101137107 1,401,436 -188,905 -11.88 54,254 -8.45 0.0966
2022-08-11 2022-06-30 13F Boston Scientific COM 101137107 1,590,341 -44,632 -2.73 59,262 -18.16 0.1104
2022-05-09 2022-03-31 13F Boston Scientific COM 101137107 1,634,973 766,610 88.28 72,411 96.31 0.1093
2022-02-04 2021-12-31 13F BOSTON SCIENTIFIC COM 101137107 868,363 -421,886 -32.70 36,886 -34.11 0.0493
2021-11-08 2021-09-30 13F BOSTON SCIENTIFIC COM 101137107 1,290,249 166,530 14.82 55,983 16.51 0.0876
2021-08-13 2021-06-30 13F/A-1 Boston Scientific COM 101137107 1,123,719 -73,428 -6.13 48,048 3.84 0.0744
2021-08-10 2021-06-30 13F BOSTON SCIENTIFIC COM 101137107 1,123,719 -73,428 48,048 0.0158
2021-05-11 2021-03-31 13F BOSTON SCIENTIFIC COM 101137107 1,197,147 119,285 11.07 46,269 19.42 0.0814
2021-02-08 2020-12-31 13F BOSTON SCIENTIFIC COM 101137107 1,077,862 230,165 27.15 38,746 19.60 0.0711
2020-10-30 2020-09-30 13F BOSTON SCIENTIFIC COM 101137107 847,697 -115,158 -11.96 32,396 -4.18 0.0796
2020-08-28 2020-06-30 13F/A-1 BOSTON SCIENTIFIC COM 101137107 962,855 -117,340 -10.86 33,809 -4.11 0.0857
2020-08-10 2020-06-30 13F BOSTON SCIENTIFIC COM 101137107 30,677 -1,049,518 33,809 19,631.5320
2020-05-13 2020-03-31 13F BOSTON SCIENTIFIC COM 101137107 1,080,195 -243,681 -18.41 35,257 -41.10 0.1077
2020-02-13 2019-12-31 13F Boston Scientific COM 101137107 1,323,876 271,329 25.78 59,857 39.77 0.1005
2019-11-12 2019-09-30 13F BOSTON SCIENTIFIC COM 101137107 1,052,547 68,309 6.94 42,824 1.26 0.0902
2019-08-26 2019-06-30 13F/A-1 Boston Scientific COM 101137107 984,238 -28,847 -2.85 42,291 8.80 0.0900
2019-08-13 2019-06-30 13F Boston Scientific COM 101137107 984,238 -28,847 42,291
2019-05-06 2019-03-31 13F BOSTON SCIENTIFIC COM 101137107 1,013,085 169,323 20.07 38,872 30.38 0.0607
2019-02-07 2018-12-31 13F BOSTON SCIENTIFIC COM 101137107 843,762 -73,150 -7.98 29,814 -15.52 0.0511
2018-11-07 2018-09-30 13F BOSTON SCIENTIFIC COM 101137107 916,912 27,288 3.07 35,293 21.35 0.0645
2018-08-06 2018-06-30 13F Boston Scientific COM 101137107 889,624 148,595 20.05 29,084 43.69 0.0590
2018-05-10 2018-03-31 13F Boston Scientific COM 101137107 741,029 149,579 25.29 20,241 38.05 0.0451
2018-02-08 2017-12-31 13F Boston Scientific COM 101137107 591,450 71,085 13.66 14,662 -3.39 0.0434
2017-11-06 2017-09-30 13F Boston Scientific COM 101137107 520,365 56,539 12.19 15,177 18.07 0.0488
2017-08-18 2017-06-30 13F BOSTON SCIENTIFIC COM 101137107 463,826 95,902 26.07 12,854 40.48 0.0411
2017-05-05 2017-03-31 13F BOSTON SCIENTIFIC COM 101137107 367,924 133,121 56.69 9,150 80.19 0.0245
2017-02-06 2016-12-31 13F Boston Scientific COM 101137107 234,803 195,094 491.31 5,078 437.35 0.0150
2016-11-03 2016-09-30 13F Boston Scientific COM 101137107 39,709 32,297 435.74 945 446.24 0.0031
2016-08-15 2016-06-30 13F Boston Scientific COM 101137107 7,412 -2,922 -28.28 173 -10.82 0.0007
2016-05-04 2016-03-31 13F Boston Scientific COM 101137107 10,334 -30,901 -74.94 194 -74.47 0.0012
2016-02-09 2015-12-31 13F Boston Scientific COM 101137107 41,235 -1,557 -3.64 760 8.26 0.0046
2015-11-10 2015-09-30 13F Boston Scientific COM 101137107 42,792 5,802 15.69 702 7.18 0.0040
2015-08-11 2015-06-30 13F Boston Scientific COM 101137107 36,990 394 1.08 655 0.77 0.0031
2015-05-15 2015-03-31 13F Boston Scientific COM 101137107 36,596 -18,134 -33.13 650 -10.34 0.0028
2015-02-10 2014-12-31 13F Boston Scientific COM 101137107 54,730 29,705 118.70 725 144.93 0.0029
2014-11-07 2014-09-30 13F Boston Scientific COM 101137107 25,025 69 0.28 296 -7.21 0.0010
2014-08-11 2014-06-30 13F BOSTON SCIENTIFIC COM 101137107 24,956 3,814 18.04 319 11.54 0.0010
2014-05-09 2014-03-31 13F BOSTON SCIENTIFIC COM 101137107 21,142 -169 -0.79 286 11.72 0.0010
2014-02-11 2013-12-31 13F BOSTON SCIENTIFIC COM 101137107 21,311 21,311 256 0.0009
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-05-15 2025-03-31 13F BOSTON SCIENTIFIC COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-19 2024-12-31 13F/A BOSTON SCIENTIFIC COM Call 6,800 607 n/a n/a n/a
2018-05-10 2018-03-31 13F Boston Scientific CALL Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-02-08 2017-12-31 13F Boston Scientific CALL Call 50,000 989 n/a n/a n/a
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.