Boston Properties, Inc.
DE ˙ DB ˙ US1011211018
52,50 € ↑1,66 (3,27%)
2026-06-02
DEL PRIS
SecurityDE:BO9 / Boston Properties, Inc.
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership216,186 shares
Latest Disclosed Value $ 11,220,053
Asset Management One Co., Ltd. reports 25.80% decrease in ownership of BO9 / Boston Properties, Inc.

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 216,186 shares of Boston Properties, Inc. (DE:BO9) valued at $9,715,399 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 291,370 shares of Boston Properties, Inc.. This represents a change in shares of -25.80% during the quarter. The current value of the position is $11,349,765 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)
2026-05-08 2026-03-31 13F BXP COM 101121101 216,186 -75,184 -25.80 11,220 -44.19 0.0331
2026-01-27 2025-12-31 13F BXP COM 101121101 291,370 -8,262 -2.76 20,106 -9.74 0.0559
2025-10-22 2025-09-30 13F BXP COM 101121101 299,632 7,757 2.66 22,275 13.11 0.0645
2025-07-31 2025-06-30 13F BXP COM 101121101 291,875 4,431 1.54 19,693 1.96 0.0617
2025-04-23 2025-03-31 13F BXP COM 101121101 287,444 2,309 0.81 19,313 -9.21 0.0668
2025-01-30 2024-12-31 13F BXP COM 101121101 285,135 17,436 6.51 21,274 -1.23 0.0731
2024-10-30 2024-09-30 13F BXP COM 101121101 267,699 -434 -0.16 21,539 30.49 0.0766
2024-07-18 2024-06-30 13F BOSTON PROPERTIES COM 101121101 268,133 -6,289 -2.29 16,506 -7.90 0.0631
2024-05-02 2024-03-31 13F BOSTON PROPERTIES COM 101121101 274,422 -14,919 -5.16 17,923 -13.91 0.0691
2024-01-24 2023-12-31 13F BOSTON PROPERTIES COM 101121101 289,341 -241 -0.08 20,818 20.87 0.0838
2023-10-19 2023-09-30 13F BOSTON PROPERTIES COM 101121101 289,582 -10,918 -3.63 17,224 -0.47 0.0767
2023-07-31 2023-06-30 13F BOSTON PROPERTIES COM 101121101 300,500 15,074 5.28 17,306 12.03 0.0733
2023-04-25 2023-03-31 13F BOSTON PROPERTIES COM 101121101 285,426 -582 -0.20 15,447 -20.03 0.0700
2023-02-06 2022-12-31 13F BOSTON PROPERTIES COM 101121101 286,008 11,804 4.30 19,317 -6.03 0.0941
2022-11-04 2022-09-30 13F BOSTON PROPERTIES COM 101121101 274,204 -11,685 -4.09 20,557 -19.19 0.1046
2022-07-29 2022-06-30 13F BOSTON PROPERTIES COM 101121101 285,889 7,509 2.70 25,438 -29.05 0.1194
2022-05-13 2022-03-31 13F BOSTON PROPERTIES COM 101121101 278,380 -19,962 -6.69 35,855 3.98 0.1400
2022-02-09 2021-12-31 13F BOSTON PROPERTIES COM 101121101 298,342 11,444 3.99 34,481 10.92 0.1201
2021-11-02 2021-09-30 13F BOSTON PROPERTIES COM 101121101 286,898 -22,114 -7.16 31,085 -12.21 0.1192
2021-08-03 2021-06-30 13F BOSTON PROPERTIES COM 101121101 309,012 -6,021 -1.91 35,409 11.00 0.1318
2021-05-14 2021-03-31 13F BOSTON PROPERTIES COM 101121101 315,033 -1,408 -0.44 31,900 8.05 0.1267
2021-02-12 2020-12-31 13F BOSTON PROPERTIES COM 101121101 316,441 -12,778 -3.88 29,523 11.67 0.1216
2020-11-13 2020-09-30 13F BOSTON PROPERTIES COM 101121101 329,219 -13,839 -4.03 26,438 -14.73 0.1215
2020-08-14 2020-06-30 13F BOSTON PPTYS LTD PARTNERSHIP COM 101121101 343,058 35,274 11.46 31,006 9.23 0.1525
2020-05-14 2020-03-31 13F BOSTON PROPERTIES COM 101121101 307,784 -37,828 -10.95 28,386 -40.42 0.1658
2020-02-14 2019-12-31 13F BOSTON PROPERTIES COM 101121101 345,612 -4,697 -1.34 47,646 4.89 0.2148
2019-11-14 2019-09-30 13F BOSTON PROPERTIES COM 101121101 350,309 -26,655 -7.07 45,423 -6.59 0.2188
2019-08-14 2019-06-30 13F BOSTON PROPERTIES COM 101121101 376,964 5,234 1.41 48,629 -2.29 0.2389
2019-05-15 2019-03-31 13F BOSTON PROPERTIES COM 101121101 371,730 -169,919 -31.37 49,770 -18.41 0.2691
2019-02-13 2018-12-31 13F BOSTON PROPERTIES COM 101121101 541,649 -5,358 -0.98 60,999 -8.47 0.1454
2018-11-14 2018-09-30 13F BOSTON PROPERTIES COM 101121101 547,007 2,733 0.50 66,644 -2.17 0.1368
2018-08-14 2018-06-30 13F BOSTON PROPERTIES COM 101121101 544,274 -12,668 -2.27 68,123 -0.73 0.1489
2018-05-14 2018-03-31 13F BOSTON PROPERTIES COM 101121101 556,942 -7,516 -1.33 68,626 -6.04 0.1545
2018-02-14 2017-12-31 13F BOSTON PROPERTIES COM 101121101 564,458 -7,276 -1.27 73,040 4.01 0.1611
2017-11-14 2017-09-30 13F BOSTON PROPERTIES COM 101121101 571,734 -4,158 -0.72 70,221 -0.95 0.1648
2017-08-14 2017-06-30 13F BOSTON PROPERTIES COM 101121101 575,892 -11,693 -1.99 70,895 -8.51 0.1810
2017-05-11 2017-03-31 13F BOSTON PROPERTIES COM 101121101 587,585 -45,688 -7.21 77,489 -1.85 0.2035
2017-05-02 2016-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 633,273 123,012 24.11 78,953 13.51 0.2018
2017-02-13 2016-12-31 13F BOSTON PROPERTIES COM 101121101 633,273 78,953
2016-11-07 2016-09-30 13F BOSTON PROPERTIES Com 101121101 510,261 -7,779 -1.50 69,553 2.10 1.0332
2016-08-03 2016-06-30 13F BOSTON PROPERTIES Com 101121101 518,040 -24,471 -4.51 68,124 -0.91 1.0221
2016-05-05 2016-03-31 13F BOSTON PROPERTIES Com 101121101 542,511 7,061 1.32 68,749 -1.07 1.0035
2016-01-28 2015-12-31 13F BOSTON PROPERTIES Com 101121101 535,450 3,230 0.61 69,496 11.15 1.0373
2015-11-12 2015-09-30 13F BOSTON PROPERTIES Com 101121101 532,220 32,254 6.45 62,525 3.50 0.9516
2015-08-06 2015-06-30 13F BOSTON PROPERTIES Com 101121101 499,966 -77,724 -13.45 60,412 -26.47 0.8371
2015-05-11 2015-03-31 13F BOSTON PROPERTIES Com 101121101 577,690 -3,730 -0.64 82,158 8.10 1.0144
2015-02-09 2014-12-31 13F BOSTON PROPERTIES Com 101121101 581,420 -49,412 -7.83 76,000 3.98 0.9863
2014-11-05 2014-09-30 13F BOSTON PROPERTIES Com 101121101 630,832 -6,052 -0.95 73,093 -3.17 1.0093
2014-08-12 2014-06-30 13F BOSTON PROPERTIES Com 101121101 636,884 -93,560 -12.81 75,487 -9.27 1.1268
2014-05-05 2014-03-31 13F BOSTON PROPERTIES Com 101121101 730,444 5,423 0.75 83,196 14.29 1.3111
2014-02-05 2013-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 725,021 -45,969 -5.96 72,791 -11.84 1.1281
2014-01-29 2013-12-31 13F BOSTON PROPERTIES COM 101121101 725,021 72,791
2014-02-05 2013-09-30 13F/A-1 BOSTON PROPERTIES COM 101121101 770,990 -20,594 -2.60 82,563 -2.03 1.2425
2013-11-06 2013-09-30 13F BOSTON PROPERTIES Com 101121101 770,990 82,563
2014-02-12 2013-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 791,584 791,584 84,278 1.3686
2013-08-05 2013-06-30 13F BOSTON PROPERTIES Com 101121101 791,584 84,278
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.