Boston Scientific Corporation
MX ˙ BMV ˙ FR0010424135
SecurityMX:BSX / Boston Scientific Corporation
InstitutionTemasek Holdings (Private) Ltd
Latest Disclosed Ownership2,399,426 shares
Latest Disclosed Value $ 150,563,982
Temasek Holdings (Private) Ltd reports 15.27% increase in ownership of BSX / Boston Scientific Corporation

On May 12, 2026 - Temasek Holdings (Private) Ltd filed a 13F-HR form disclosing ownership of 2,399,426 shares of Boston Scientific Corporation (MX:BSX) valued at $150,563,982 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,081,626 shares of Boston Scientific Corporation. This represents a change in shares of 15.27% 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.

Upgrade to unlock premium data and export to Excel .

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 COM 101137107 2,399,426 317,800 15.27 150,564 -24.14 0.4939
2026-02-17 2025-12-31 13F BOSTON SCIENTIFIC COM 101137107 2,081,626 402,300 23.96 198,483 21.06 0.6286
2025-11-14 2025-09-30 13F BOSTON SCIENTIFIC COM 101137107 1,679,326 593,915 54.72 163,953 40.63 0.5657
2025-08-14 2025-06-30 13F BOSTON SCIENTIFIC COM 101137107 1,085,411 0 0.00 116,584 6.47 0.4457
2025-05-16 2025-03-31 13F BOSTON SCIENTIFIC COM 101137107 1,085,411 678,917 167.02 109,496 201.58 0.4407
2025-02-14 2024-12-31 13F BOSTON SCIENTIFIC COM 101137107 406,494 406,494 36,308 0.1432
2021-05-17 2021-03-31 13F BOSTON SCIENTIFIC COM 101137107 0 -232,545 -100.00 0 -100.00
2021-02-16 2020-12-31 13F BOSTON SCIENTIFIC COM 101137107 232,545 232,545 8,360 0.0359
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.