Boston Properties, Inc.
US ˙ NYSE ˙ US1011211018

SecurityBXP / Boston Properties, Inc.
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership170,464 shares
Latest Disclosed Value $ 8,847
Natixis Advisors, L.p. reports 35.39% decrease in ownership of BXP / Boston Properties, Inc.

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 170,464 shares of Boston Properties, Inc. (US:BXP) valued at $8,847,082 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 263,852 shares of Boston Properties, Inc.. This represents a change in shares of -35.39% during the quarter. The current value of the position is $10,381,258 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)
2026-05-13 2026-03-31 13F BXP COM 101121101 170,464 -93,388 -35.39 9 -52.94 0.0123
2026-02-10 2025-12-31 13F BXP COM 101121101 263,852 6,175 2.40 18 -10.53 0.0252
2025-11-13 2025-09-30 13F BXP COM 101121101 257,677 38,109 17.36 19 35.71 0.0280
2025-08-13 2025-06-30 13F BXP COM 101121101 219,568 34,323 18.53 15 16.67 0.0235
2025-05-08 2025-03-31 13F BXP COM 101121101 185,245 17,296 10.30 12 0.00 0.0230
2025-02-10 2024-12-31 13F BXP COM 101121101 167,949 -1,404 -0.83 12 -7.69 0.0233
2024-11-06 2024-09-30 13F BXP COM 101121101 169,353 21,280 14.37 14 44.44 0.0266
2024-08-01 2024-06-30 13F BOSTON PROPERTIES COM 101121101 148,073 51,158 52.79 9 50.00 0.0198
2024-04-25 2024-03-31 13F BOSTON PROPERTIES COM 101121101 96,915 31,223 47.53 6 50.00 0.0146
2024-02-06 2023-12-31 13F BOSTON PROPERTIES COM 101121101 65,692 15,783 31.62 5 100.00 0.0121
2023-11-13 2023-09-30 13F BOSTON PROPERTIES COM 101121101 49,909 -9,613 -16.15 3 -33.33 0.0091
2023-08-15 2023-06-30 13F BOSTON PROPERTIES COM 101121101 59,522 25,626 75.60 3 200.00 0.0106
2023-05-11 2023-03-31 13F BOSTON PROPERTIES COM 101121101 33,896 10,175 42.89 2 0.00 0.0063
2023-01-27 2022-12-31 13F BOSTON PROPERTIES COM 101121101 23,721 -8,184 -25.65 2 -99.96 0.0061
2022-11-14 2022-09-30 13F BOSTON PROPERTIES COM 101121101 31,905 -28,837 -47.47 2,392 -55.74 0.0101
2022-08-12 2022-06-30 13F BOSTON PROPERTIES COM 101121101 60,742 17,797 41.44 5,405 -2.28 0.0238
2022-05-12 2022-03-31 13F BOSTON PROPERTIES COM 101121101 42,945 6,283 17.14 5,531 30.97 0.0211
2022-02-08 2021-12-31 13F BOSTON PROPERTIES COM 101121101 36,662 4,074 12.50 4,223 19.60 0.0161
2021-11-15 2021-09-30 13F BOSTON PROPERTIES COM 101121101 32,588 -14,989 -31.50 3,531 -35.23 0.0145
2021-08-12 2021-06-30 13F BOSTON PROPERTIES COM 101121101 47,577 -11,383 -19.31 5,452 -8.66 0.0254
2021-05-05 2021-03-31 13F BOSTON PROPERTIES COM 101121101 58,960 4,048 7.37 5,969 14.99 0.0312
2021-02-12 2020-12-31 13F BOSTON PROPERTIES COM 101121101 54,912 -2,023 -3.55 5,191 13.54 0.0299
2020-11-12 2020-09-30 13F BOSTON PROPERTIES COM 101121101 56,935 -9,726 -14.59 4,572 -24.10 0.0288
2020-08-11 2020-06-30 13F BOSTON PPTYS LTD PARTNERSHIP COM 101121101 66,661 -1,327 -1.95 6,024 -3.94 0.0400
2020-04-27 2020-03-31 13F BOSTON PROPERTIES COM 101121101 67,988 4,227 6.63 6,271 -28.66 0.0511
2020-02-10 2019-12-31 13F BOSTON PROPERTIES COM 101121101 63,761 -4,660 -6.81 8,790 -0.91 0.0620
2019-11-12 2019-09-30 13F BOSTON PROPERTIES COM 101121101 68,421 -12,849 -15.81 8,871 -15.38 0.0704
2019-08-12 2019-06-30 13F BOSTON PROPERTIES COM 101121101 81,270 -1,243 -1.51 10,483 -5.10 0.0856
2019-05-15 2019-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 82,513 -4,428 -5.09 11,046 12.89 0.0967
2019-05-15 2019-03-31 13F BOSTON PROPERTIES COM 101121101 82,513 -4,428 11,046
2019-02-13 2018-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 86,941 -7,718 -8.15 9,785 -16.02 0.0966
2019-02-13 2018-12-31 13F BOSTON PROPERTIES COM 101121101 86,941 -7,718 9,785
2018-11-13 2018-09-30 13F BOSTON PROPERTIES COM 101121101 94,659 922 0.98 11,651 -0.89 0.1026
2018-08-14 2018-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 93,737 -2,437 -2.53 11,756 -0.79 0.1123
2018-08-14 2018-06-30 13F BOSTON PROPERTIES COM 101121101 93,737 11,756
2018-05-10 2018-03-31 13F BOSTON PROPERTIES COM 101121101 96,174 -3,860 -3.86 11,850 -8.90 0.1170
2018-02-14 2017-12-31 13F BOSTON PROPERTIES COM 101121101 100,034 -8,713 -8.01 13,008 -2.65 0.1325
2017-11-14 2017-09-30 13F BOSTON PROPERTIES COM 101121101 108,747 -2,189 -1.97 13,362 -2.09 0.1412
2017-07-27 2017-06-30 13F BOSTON PROPERTIES COM 101121101 110,936 -400 -0.36 13,647 -7.43 0.1477
2017-05-12 2017-03-31 13F BOSTON PROPERTIES COM 101121101 111,336 609 0.55 14,742 5.85 0.1633
2017-02-07 2016-12-31 13F BOSTON PROPERTIES COM 101121101 110,727 10,386 10.35 13,927 1.84 0.1674
2016-11-04 2016-09-30 13F BOSTON PROPERTIES COM 101121101 100,341 -4,594 -4.38 13,676 -1.19 0.1772
2016-08-01 2016-06-30 13F BOSTON PROPERTIES COM 101121101 104,935 5,167 5.18 13,841 9.16 0.1913
2016-05-06 2016-03-31 13F BOSTON PROPERTIES COM 101121101 99,768 3,451 3.58 12,679 3.22 0.1897
2016-02-12 2015-12-31 13F BOSTON PROPERTIES COM 101121101 96,317 -16,311 -14.48 12,284 -7.88 0.2014
2015-11-12 2015-09-30 13F BOSTON PROPERTIES COM 101121101 112,628 10,877 10.69 13,335 8.27 0.2313
2015-08-14 2015-06-30 13F BOSTON PROPERTIES COM 101121101 101,751 8,459 9.07 12,316 -6.03 0.2091
2015-05-15 2015-03-31 13F BOSTON PROPERTIES COM 101121101 93,292 -3,040 -3.16 13,106 5.72 0.2301
2015-02-05 2014-12-31 13F BOSTON PROPERTIES COM 101121101 96,332 9,999 11.58 12,397 24.04 0.2320
2014-11-03 2014-09-30 13F BOSTON PROPERTIES COM 101121101 86,333 -89,273 -50.84 9,994 -51.84 0.2005
2014-08-13 2014-06-30 13F BOSTON PPTYS COM 101121101 175,606 -6,851 -3.75 20,753 -0.68 0.2974
2014-05-13 2014-03-31 13F BOSTON PPTYS COM 101121101 182,457 -706 -0.39 20,896 13.66 0.3216
2014-02-12 2013-12-31 13F BOSTON PPTYS COM 101121101 183,163 10,312 5.97 18,384 -0.51 0.3009
2013-10-30 2013-09-30 13F BOSTON PROPERTIES COM 101121101 172,851 -11,871 -6.43 18,478 -5.16 0.3403
2013-07-19 2013-06-30 13F BOSTON PROPERTIES COM 101121101 184,722 184,722 19,483 0.3882
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.