Boston Properties, Inc.
US ˙ NYSE ˙ US1011211018

SecurityBXP / Boston Properties, Inc.
InstitutionKBC Group NV
Latest Disclosed Ownership4,012 shares
Latest Disclosed Value $ 208
KBC Group NV reports 78.97% decrease in ownership of BXP / Boston Properties, Inc.

On May 7, 2026 - KBC Group NV filed a 13F-HR form disclosing ownership of 4,012 shares of Boston Properties, Inc. (US:BXP) valued at $208,223 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 19,074 shares of Boston Properties, Inc.. This represents a change in shares of -78.97% during the quarter. The current value of the position is $244,331 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)
2026-05-07 2026-03-31 13F BXP COM 101121101 4,012 -15,062 -78.97 0 -100.00 0.0003
2026-01-26 2025-12-31 13F BXP COM 101121101 19,074 -341 -1.76 1 0.00 0.0029
2026-01-20 2025-09-30 13F BXP COM 101121101 19,415 -4,390 -18.44 1 0.00 0.0035
2025-08-08 2025-06-30 13F BXP COM 101121101 23,805 -2,567 -9.73 2 0.00 0.0043
2025-04-25 2025-03-31 13F BXP COM 101121101 26,372 -22,567 -46.11 2 -66.67 0.0055
2025-01-22 2024-12-31 13F BXP COM 101121101 48,939 -101,250 -67.42 4 -75.00 0.0100
2024-11-06 2024-09-30 13F BXP COM 101121101 150,189 125,669 512.52 12 1,100.00 0.0365
2024-07-17 2024-06-30 13F BOSTON PROPERTIES COM 101121101 24,520 0 0.00 2 0.00 0.0046
2024-05-08 2024-03-31 13F BOSTON PROPERTIES COM 101121101 24,520 -287 -1.16 2 0.00 0.0051
2024-02-13 2023-12-31 13F BOSTON PROPERTIES COM 101121101 24,807 2,816 12.81 2 0.00 0.0062
2024-02-15 2023-09-30 13F/A-1 BOSTON PROPERTIES COM 101121101 21,991 11,587 111.37 1 0.0053
2023-11-22 2023-09-30 13F BOSTON PROPERTIES COM 101121101 10,209 0 1 0.0024
2024-02-15 2023-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 10,404 406 4.06 1 0.0025
2023-07-28 2023-06-30 13F BOSTON PROPERTIES COM 101121101 10,209 406 1 0.0024
2024-02-14 2023-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 9,998 361 3.75 1 -100.00 0.0023
2023-05-04 2023-03-31 13F BOSTON PROPERTIES COM 101121101 9,803 -30,909 1 0.0025
2024-02-14 2022-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 9,637 -31,270 -76.44 1 -100.00 0.0032
2023-02-13 2022-12-31 13F BOSTON PROPERTIES COM 101121101 40,712 -195 3 0.0000
2024-02-15 2022-09-30 13F/A-1 BOSTON PROPERTIES COM 101121101 40,907 -9,184 -18.33 3 -25.00 0.0159
2022-11-08 2022-09-30 13F BOSTON PROPERTIES COM 101121101 40,712 -9,379 3,052 0.0160
2024-02-14 2022-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 50,091 15,301 43.98 4 0.00 0.0222
2022-07-26 2022-06-30 13F BOSTON PROPERTIES COM 101121101 50,091 15,301 4,457 0.0224
2024-02-14 2022-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 34,790 26,089 299.84 4 300.00 0.0177
2022-05-06 2022-03-31 13F BOSTON PROPERTIES COM 101121101 34,790 26,089 4,481 0.0165
2024-02-14 2021-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 8,701 -32,574 -78.92 1 -99.98 0.0033
2022-02-03 2021-12-31 13F BOSTON PROPERTIES COM 101121101 8,701 -32,574 1,002 0.0031
2021-11-10 2021-09-30 13F BOSTON PROPERTIES COM 101121101 41,275 -4,911 -10.63 4,472 -15.51 0.0164
2022-02-15 2021-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 46,186 -66,515 -59.02 5,293 -53.62 0.0191
2021-08-11 2021-06-30 13F BOSTON PROPERTIES COM 101121101 46,186 -66,515 5,293 0.0191
2022-02-14 2021-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 112,701 -16,607 -12.84 11,412 -90.52 0.0462
2021-04-26 2021-03-31 13F BOSTON PROPERTIES COM 101121101 112,701 -16,607 11,412 0.0462
2022-02-14 2020-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 129,308 -41,717 -24.39 120,363 776.39 0.0566
2021-02-10 2020-12-31 13F BOSTON PROPERTIES COM 101121101 129,308 -41,717 12,223 0.0563
2022-02-14 2020-09-30 13F/A-1 BOSTON PROPERTIES COM 101121101 171,025 10,242 6.37 13,734 -5.48 0.0809
2020-10-28 2020-09-30 13F BOSTON PROPERTIES COM 101121101 171,025 10,242 13,734 0.0812
2022-02-14 2020-06-30 13F/A-1 BOSTON PPTYS LTD PARTNERSHIP COM 101121101 160,783 -34,820 -17.80 14,531 -19.45 0.0960
2020-08-10 2020-06-30 13F BOSTON PPTYS LTD PARTNERSHIP COM 101121101 160,783 -34,820 14,531 0.0972
2020-05-04 2020-03-31 13F BOSTON PROPERTIES COM 101121101 195,603 24,580 14.37 18,040 -23.48 0.1510
2020-02-11 2019-12-31 13F BOSTON PROPERTIES COM 101121101 171,023 2,735 1.63 23,577 8.05 0.1491
2019-11-07 2019-09-30 13F BOSTON PROPERTIES COM 101121101 168,288 6,768 4.19 21,820 4.72 0.1600
2019-08-08 2019-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 161,520 22,808 16.44 20,836 12.20 0.1613
2019-07-30 2019-06-30 13F BOSTON PROPERTIES COM 101121101 161,520 -99,689 20,836
2019-08-07 2019-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 138,712 88,547 176.51 18,570 228.91 0.1530
2019-05-10 2019-03-31 13F BOSTON PROPERTIES COM 101121101 138,712 88,547 18,570
2019-01-31 2018-12-31 13F BOSTON PROPERTIES COM 101121101 50,165 -3,427 -6.39 5,646 -14.40 0.0629
2018-11-14 2018-09-30 13F BOSTON PROPERTIES COM 101121101 53,592 4,444 9.04 6,596 7.01 0.0499
2018-08-03 2018-06-30 13F BOSTON PROPERTIES COM 101121101 49,148 6,237 14.53 6,164 16.57 0.0537
2018-08-03 2018-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 42,911 -5,164 -10.74 5,288 -15.41 0.0489
2018-05-09 2018-03-31 13F BOSTON PROPERTIES COM 101121101 42,911 -5,164 5,288
2018-08-03 2017-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 48,075 -5,829 -10.81 6,251 -5.63 0.0535
2018-02-07 2017-12-31 13F BOSTON PROPERTIES COM 101121101 48,075 -5,829 6,251
2017-11-13 2017-09-30 13F BOSTON PROPERTIES COM 101121101 53,904 -10,965 -16.90 6,624 -16.99 0.0601
2017-08-04 2017-06-30 13F BOSTON PROPERTIES COM 101121101 64,869 -121,049 -65.11 7,980 -67.58 0.0771
2017-05-10 2017-03-31 13F BOSTON PROPERTIES COM 101121101 185,918 -113,345 -37.87 24,617 -34.60 0.2222
2017-02-16 2016-12-31 13F BOSTON PROPERTIES COM 101121101 299,263 98,319 48.93 37,642 37.44 0.3731
2016-11-03 2016-09-30 13F BOSTON PROPERTIES COM 101121101 200,944 17,015 9.25 27,387 12.89 0.3235
2016-08-03 2016-06-30 13F BOSTON PROPERTIES COM 101121101 183,929 40,653 28.37 24,260 33.25 0.3470
2016-05-11 2016-03-31 13F BOSTON PROPERTIES COM 101121101 143,276 -11,916 -7.68 18,207 -8.01 0.3025
2016-02-11 2015-12-31 13F BOSTON PROPERTIES COM 101121101 155,192 23,579 17.92 19,793 27.02 0.3646
2015-11-12 2015-09-30 13F BOSTON PROPERTIES COM 101121101 131,613 -16,181 -10.95 15,583 -12.89 0.3135
2015-12-16 2015-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 147,794 -49,007 -24.90 17,889 -35.29 0.2299
2015-07-31 2015-06-30 13F BOSTON PROPERTIES COM 101121101 147,794 17,889
2015-12-16 2015-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 196,801 114,213 138.29 27,646 160.12 0.3512
2015-04-30 2015-03-31 13F BOSTON PROPERTIES COM 101121101 196,801 27,646
2015-12-15 2014-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 82,588 78,386 1,865.45 10,628 2,086.83 0.1266
2015-02-12 2014-12-31 13F BOSTON PROPERTIES COM 101121101 82,588 10,628
2014-10-16 2014-09-30 13F BOSTON PROPERTIES COM 101121101 4,202 -136,463 -97.01 486 -97.08 0.0170
2014-08-01 2014-06-30 13F BOSTON PROPERTIES COM 101121101 140,665 43,401 44.62 16,624 49.23 0.1899
2014-04-30 2014-03-31 13F BOSTON PROPERTIES COM 101121101 97,264 30,916 46.60 11,140 67.29 0.1759
2014-01-21 2013-12-31 13F BOSTON PPTYS COM 101121101 66,348 -16,539 -19.95 6,659 -24.84 0.1007
2013-11-06 2013-09-30 13F BOSTON PPTYS COM 101121101 82,887 28,624 52.75 8,860 54.81 0.1426
2013-07-29 2013-06-30 13F BOSTON PPTYS COM 101121101 54,263 54,263 5,723 0.1062
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.