Boston Scientific Corporation
US ˙ NYSE ˙ US1011371077

SecurityBSX / Boston Scientific Corporation
InstitutionOMERS ADMINISTRATION Corp
Latest Disclosed Ownership79,936 shares
Latest Disclosed Value $ 5,015,984
OMERS ADMINISTRATION Corp reports 7.14% increase in ownership of BSX / Boston Scientific Corporation

On May 15, 2026 - OMERS ADMINISTRATION Corp filed a 13F-HR form disclosing ownership of 79,936 shares of Boston Scientific Corporation (US:BSX) valued at $5,015,984 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 74,610 shares of Boston Scientific Corporation. This represents a change in shares of 7.14% during the quarter. The current value of the position is $3,812,148 USD.

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)
2026-05-15 2026-03-31 13F BOSTON SCIENTIFIC COM 101137107 79,936 5,326 7.14 5,016 -29.51 0.0323
2026-02-13 2025-12-31 13F BOSTON SCIENTIFIC COM 101137107 74,610 19,383 35.10 7,114 31.96 0.0507
2025-11-14 2025-09-30 13F BOSTON SCIENTIFIC COM 101137107 55,227 0 0.00 5,392 -9.10 0.0386
2025-08-13 2025-06-30 13F BOSTON SCIENTIFIC COM 101137107 55,227 500 0.91 5,932 7.45 0.0466
2025-05-14 2025-03-31 13F BOSTON SCIENTIFIC COM 101137107 54,727 -6,569 -10.72 5,521 0.84 0.0483
2025-02-14 2024-12-31 13F BOSTON SCIENTIFIC COM 101137107 61,296 10,431 20.51 5,475 28.44 0.0479
2024-11-13 2024-09-30 13F BOSTON SCIENTIFIC COM 101137107 50,865 -32,800 -39.20 4,262 -33.85 0.0392
2024-08-13 2024-06-30 13F BOSTON SCIENTIFIC COM 101137107 83,665 83,665 6,443 0.0620
2023-08-14 2023-06-30 13F BOSTON SCIENTIFIC COM 101137107 0 -4,111,160 -100.00 0 -100.00
2023-05-12 2023-03-31 13F BOSTON SCIENTIFIC COM 101137107 4,111,160 0 0.00 205,681 8.13 3.1705
2023-02-13 2022-12-31 13F BOSTON SCIENTIFIC COM 101137107 4,111,160 0 0.00 190,223 19.47 3.0462
2022-11-14 2022-09-30 13F BOSTON SCIENTIFIC COM 101137107 4,111,160 1,624,700 65.34 159,225 71.82 2.6582
2022-08-12 2022-06-30 13F BOSTON SCIENTIFIC COM 101137107 2,486,460 -1,000,700 -28.70 92,670 -40.00 1.3380
2022-05-12 2022-03-31 13F BOSTON SCIENTIFIC COM 101137107 3,487,160 0 0.00 154,446 4.26 1.9818
2022-02-14 2021-12-31 13F BOSTON SCIENTIFIC COM 101137107 3,487,160 824,549 30.97 148,135 28.22 1.9212
2021-11-12 2021-09-30 13F BOSTON SCIENTIFIC COM 101137107 2,662,611 16,200 0.61 115,531 2.09 1.6819
2021-08-13 2021-06-30 13F BOSTON SCIENTIFIC COM 101137107 2,646,411 36,134 1.38 113,161 12.17 1.6417
2021-05-14 2021-03-31 13F BOSTON SCIENTIFIC COM 101137107 2,610,277 -498,362 -16.03 100,887 -9.73 1.5981
2021-02-12 2020-12-31 13F BOSTON SCIENTIFIC COM 101137107 3,108,639 1,369,774 78.77 111,756 68.20 2.0156
2020-11-12 2020-09-30 13F BOSTON SCIENTIFIC COM 101137107 1,738,865 98,251 5.99 66,442 15.35 1.4037
2020-08-14 2020-06-30 13F BOSTON SCIENTIFIC COM 101137107 1,640,614 1,640,614 57,602 1.9116
2015-02-11 2014-12-31 13F BOSTON SCIENTIFIC COM 101137107 0 -237,300 -100.00 0 -100.00
2014-11-10 2014-09-30 13F BOSTON SCIENTIFIC COM 101137107 237,300 -9,700 -3.93 2,803 -11.13 0.0835
2014-08-11 2014-06-30 13F BOSTON SCIENTIFIC COM 101137107 247,000 0 0.00 3,154 -5.54 0.1024
2014-05-08 2014-03-31 13F BOSTON SCIENTIFIC COM 101137107 247,000 0 0.00 3,339 12.46 0.1079
2014-02-13 2013-12-31 13F BOSTON SCIENTIFIC COM 101137107 247,000 -223,400 -47.49 2,969 -46.23 0.1091
2013-11-14 2013-09-30 13F BOSTON SCIENTIFIC COM 101137107 470,400 187,400 66.22 5,522 110.52 0.5220
2013-08-13 2013-06-30 13F BOSTON SCIENTIFIC COM 101137107 283,000 283,000 2,623 0.2448
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.