Boston Properties, Inc.
MX ˙ BMV ˙ US1011211018
SecurityMX:BXP / Boston Properties, Inc.
InstitutionDaiwa Securities Group Inc.
Latest Disclosed Ownership4,319,777 shares
Latest Disclosed Value $ 224,196,426
Daiwa Securities Group Inc. reports 40.89% increase in ownership of BXP / Boston Properties, Inc.

On May 13, 2026 - Daiwa Securities Group Inc. filed a 13F-HR form disclosing ownership of 4,319,777 shares of Boston Properties, Inc. (MX:BXP) valued at $224,196,426 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 3,065,995 shares of Boston Properties, Inc.. This represents a change in shares of 40.89% 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)
2026-05-13 2026-03-31 13F BXP COM 101121101 4,319,777 1,253,782 40.89 224,196 108,733.01 0.6445
2026-02-10 2025-12-31 13F BXP COM 101121101 3,065,995 1,053,938 52.38 207 38.26 0.6610
2025-11-14 2025-09-30 13F BXP COM 101121101 2,012,057 873,974 76.79 150 96.05 0.5048
2025-08-14 2025-06-30 13F BXP COM 101121101 1,138,083 472,221 70.92 77 72.73 0.2834
2025-05-13 2025-03-31 13F BXP COM 101121101 665,862 595,466 845.88 45 780.00 0.1891
2025-02-07 2024-12-31 13F BXP COM 101121101 70,396 1,195 1.73 5 0.00 0.0234
2024-11-12 2024-09-30 13F BXP COM 101121101 69,201 5,572 8.76 6 66.67 0.0257
2024-08-07 2024-06-30 13F BOSTON PROPERTIES COM 101121101 63,629 175 0.28 4 -25.00 0.0208
2024-05-02 2024-03-31 13F BOSTON PROPERTIES COM 101121101 63,454 3,548 5.92 4 0.00 0.0234
2024-01-31 2023-12-31 13F BOSTON PROPERTIES COM 101121101 59,906 -1,510 -2.46 4 33.33 0.0261
2023-11-01 2023-09-30 13F BOSTON PROPERTIES COM 101121101 61,416 3,344 5.76 4 0.00 0.0260
2023-07-31 2023-06-30 13F BOSTON PROPERTIES COM 101121101 58,072 980 1.72 3 0.00 0.0221
2023-05-02 2023-03-31 13F BOSTON PROPERTIES COM 101121101 57,092 5,825 11.36 3 0.00 0.0215
2023-02-06 2022-12-31 13F BOSTON PROPERTIES COM 101121101 51,267 -85 -0.17 3 -99.92 0.0266
2022-11-02 2022-09-30 13F BOSTON PROPERTIES COM 101121101 51,352 323 0.63 3,850 -15.22 0.0320
2022-08-09 2022-06-30 13F BOSTON PROPERTIES COM 101121101 51,029 -2,571 -4.80 4,541 -34.23 0.0347
2022-04-29 2022-03-31 13F BOSTON PROPERTIES COM 101121101 53,600 -1,972 -3.55 6,904 7.86 0.0319
2022-02-03 2021-12-31 13F BOSTON PROPERTIES COM 101121101 55,572 2,955 5.62 6,401 12.28 0.0377
2021-11-05 2021-09-30 13F BOSTON PROPERTIES COM 101121101 52,617 3,457 7.03 5,701 1.21 0.0375
2021-08-06 2021-06-30 13F BOSTON PROPERTIES COM 101121101 49,160 1,190 2.48 5,633 15.98 0.0379
2021-05-03 2021-03-31 13F BOSTON PROPERTIES COM 101121101 47,970 1,612 3.48 4,857 10.84 0.0361
2021-02-04 2020-12-31 13F BOSTON PROPERTIES COM 101121101 46,358 4,327 10.29 4,382 29.84 0.0339
2020-11-02 2020-09-30 13F BOSTON PROPERTIES COM 101121101 42,031 -7,252 -14.72 3,375 -1.78 0.0306
2020-08-11 2020-06-30 13F BOSTON PPTYS COM 101121101 49,283 0 0.00 3,436 -24.40 0.0725
2020-05-14 2020-03-31 13F BOSTON PROPERTIES COM 101121101 49,283 -648,762 -92.94 4,545 -95.28 0.0472
2020-01-31 2019-12-31 13F BOSTON PROPERTIES COM 101121101 698,045 -217,240 -23.73 96,233 -18.91 0.7943
2019-11-04 2019-09-30 13F BOSTON PROPERTIES COM 101121101 915,285 -246,419 -21.21 118,676 -20.81 1.0054
2019-07-24 2019-06-30 13F BOSTON PROPERTIES COM 101121101 1,161,704 -86,314 -6.92 149,860 -10.31 1.3240
2019-04-26 2019-03-31 13F BOSTON PROPERTIES COM 101121101 1,248,018 -152,574 -10.89 167,085 5.99 1.4596
2019-02-05 2018-12-31 13F BOSTON PROPERTIES COM 101121101 1,400,592 -608,488 -30.29 157,637 -36.26 1.5122
2018-11-01 2018-09-30 13F BOSTON PROPERTIES COM 101121101 2,009,080 -1,882,855 -48.38 247,298 -49.34 2.0709
2018-07-30 2018-06-30 13F BOSTON PROPERTIES COM 101121101 3,891,935 715,086 22.51 488,127 24.70 3.8446
2018-05-02 2018-03-31 13F BOSTON PROPERTIES COM 101121101 3,176,849 1,360,861 74.94 391,451 65.78 3.1353
2018-02-06 2017-12-31 13F BOSTON PROPERTIES COM 101121101 1,815,988 1,788,312 6,461.60 236,133 6,843.05 1.6695
2017-11-02 2017-09-30 13F BOSTON PROPERTIES COM 101121101 27,676 1,676 6.45 3,401 6.31 0.0233
2017-07-28 2017-06-30 13F BOSTON PROPERTIES COM 101121101 26,000 3,000 13.04 3,199 5.06 0.0207
2017-05-02 2017-03-31 13F BOSTON PROPERTIES COM 101121101 23,000 1,750 8.24 3,045 13.92 0.0191
2017-02-01 2016-12-31 13F BOSTON PROPERTIES COM 101121101 21,250 7,400 53.43 2,673 41.58 0.0172
2017-01-10 2016-09-30 13F/A-1 BOSTON PROPERTIES COM 101121101 13,850 3,800 37.81 1,888 42.38 0.0113
2016-11-04 2016-09-30 13F BOSTON PROPERTIES COM 101121101 13,850 1,888
2016-07-25 2016-06-30 13F BOSTON PROPERTIES COM 101121101 10,050 250 2.55 1,326 6.51 0.0079
2016-05-12 2016-03-31 13F BOSTON PROPERTIES COM 101121101 9,800 800 8.89 1,245 8.45 0.0079
2016-02-04 2015-12-31 13F BOSTON PROPERTIES COM 101121101 9,000 -138,185 -93.89 1,148 -93.41 0.0076
2015-11-10 2015-09-30 13F BOSTON PROPERTIES COM 101121101 147,185 -625,973 -80.96 17,427 -81.38 0.1240
2015-08-05 2015-06-30 13F BOSTON PROPERTIES COM 101121101 773,158 -537,402 -41.01 93,583 -49.17 0.6650
2015-05-12 2015-03-31 13F BOSTON PROPERTIES COM 101121101 1,310,560 -253,652 -16.22 184,107 -8.54 1.2318
2015-02-13 2014-12-31 13F BOSTON PROPERTIES COM 101121101 1,564,212 -437,911 -21.87 201,299 -13.15 1.4209
2014-11-12 2014-09-30 13F BOSTON PROPERTIES COM 101121101 2,002,123 -1,115,916 -35.79 231,766 -37.10 1.7560
2014-08-13 2014-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 3,118,039 -509,369 368,490 2.7471
2014-08-13 2014-06-30 13F/A-2 BOSTON PROPERTIES COM 101121101 3,118,039 -509,369 -14.04 368,490 -11.30 7.9421
2014-08-13 2014-06-30 13F BOSTON PROPERTIES COM 101121101 3,118,039 368,490
2014-05-14 2014-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 3,627,408 -505,978 415,447 3.2506
2014-05-15 2014-03-31 13F/A-2 BOSTON PROPERTIES COM 101121101 3,627,408 -505,978 -12.24 415,447 0.14 3.2506
2014-05-13 2014-03-31 13F BOSTON PROPERTIES COM 101121101 3,627,408 415,447
2014-02-13 2013-12-31 13F BOSTON PROPERTIES COM 101121101 4,133,386 379,576 10.11 414,868 3.39 3.5250
2013-11-14 2013-09-30 13F BOSTON PROPERTIES COM 101121101 3,753,810 1,412,544 60.33 401,282 62.51 3.1964
2013-08-16 2013-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 2,341,266 2,341,266 246,934 1.8720
2013-08-13 2013-06-30 13F BOSTON PROPERTIES COM 101121101 2,341,266 246,934
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.