보스턴 프로퍼티, Inc.
US ˙ NYSE ˙ US1011211018

SecurityBXP / Boston Properties, Inc.
InstitutionBrown Advisory Inc
Latest Disclosed Ownership12,454 shares
Latest Disclosed Value $ 646,363
Brown Advisory Inc reports 53.56% increase in ownership of BXP / Boston Properties, Inc.

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 12,454 shares of Boston Properties, Inc. (US:BXP) valued at $646,363 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 8,110 shares of Boston Properties, Inc.. This represents a change in shares of 53.56% during the quarter. The current value of the position is $772,771 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)
2026-05-15 2026-03-31 13F BXP COM 101121101 12,454 4,344 53.56 646 18.10 0.0011
2026-02-13 2025-12-31 13F BXP COM 101121101 8,110 989 13.89 547 3.40 0.0008
2025-11-14 2025-09-30 13F BXP COM 101121101 7,121 -352 -4.71 529 4.96 0.0007
2025-08-13 2025-06-30 13F BXP COM 101121101 7,473 -2,782 -27.13 504 -26.85 0.0007
2025-04-30 2025-03-31 13F BXP COM 101121101 10,255 -87 -0.84 689 -10.40 0.0010
2025-02-14 2024-12-31 13F BXP COM 101121101 10,342 -313 -2.94 769 -10.27 0.0010
2024-11-13 2024-09-30 13F BXP COM 101121101 10,655 -297 -2.71 857 27.15 0.0011
2024-08-14 2024-06-30 13F BOSTON PROPERTIES COM 101121101 10,952 173 1.60 674 -4.13 0.0009
2024-04-24 2024-03-31 13F BOSTON PROPERTIES COM 101121101 10,779 2,103 24.24 704 15.63 0.0009
2024-02-08 2023-12-31 13F BOSTON PROPERTIES COM 101121101 8,676 61 0.71 609 18.75 0.0009
2023-10-25 2023-09-30 13F BOSTON PROPERTIES COM 101121101 8,615 -403 -4.47 512 -1.35 0.0008
2023-07-31 2023-06-30 13F BOSTON PROPERTIES COM 101121101 9,018 -1,489 -14.17 519 -8.63 0.0008
2023-05-08 2023-03-31 13F BOSTON PROPERTIES COM 101121101 10,507 167 1.62 569 -18.62 0.0010
2023-02-13 2022-12-31 13F BOSTON PROPERTIES COM 101121101 10,340 -972 -8.59 699 -17.59 0.0013
2022-11-14 2022-09-30 13F BOSTON PROPERTIES COM 101121101 11,312 -25 -0.22 847 -15.97 0.0016
2022-11-14 2022-06-30 13F/A-2 BOSTON PROPERTIES COM 101121101 11,337 1,056 10.27 1,008 -23.92 0.0019
2022-09-13 2022-06-30 13F/A-1 BOSTON PROPERTIES COM 101121101 13,842 2,548 1,231 0.0021
2022-08-02 2022-06-30 13F BOSTON PROPERTIES COM 101121101 9,792 1,106 871 0.0006
2022-11-14 2022-03-31 13F/A-2 BOSTON PROPERTIES COM 101121101 10,281 2,029 24.59 1,325 39.47 0.0020
2022-09-13 2022-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 11,294 3,042 1,455 0.0020
2022-05-09 2022-03-31 13F BOSTON PROPERTIES COM 101121101 8,686 434 1,119 0.0015
2022-01-27 2021-12-31 13F BOSTON PROPERTIES COM 101121101 8,252 -8 -0.10 950 6.15 0.0012
2021-11-12 2021-09-30 13F BOSTON PROPERTIES COM 101121101 8,260 -1,620 -16.40 895 -20.94 0.0013
2021-07-29 2021-06-30 13F BOSTON PROPERTIES COM 101121101 9,880 -80 -0.80 1,132 12.19 0.0017
2021-05-14 2021-03-31 13F BOSTON PROPERTIES COM 101121101 9,960 -4,264 -29.98 1,009 -24.98 0.0017
2021-02-12 2020-12-31 13F BOSTON PROPERTIES COM 101121101 14,224 -1,583 -10.01 1,345 5.99 0.0024
2020-11-16 2020-09-30 13F BOSTON PROPERTIES COM 101121101 15,807 -274 -1.70 1,269 -12.66 0.0026
2020-08-14 2020-06-30 13F BOSTON PPTYS LTD PARTNERSHIP COM 101121101 16,081 -576 -3.46 1,453 -5.40 0.0034
2020-05-15 2020-03-31 13F BOSTON PROPERTIES COM 101121101 16,657 6,706 67.39 1,536 11.95 0.0047
2020-02-14 2019-12-31 13F BOSTON PROPERTIES COM 101121101 9,951 -270 -2.64 1,372 3.55 0.0035
2019-11-14 2019-09-30 13F BOSTON PROPERTIES COM 101121101 10,221 -23 -0.22 1,325 0.30 0.0037
2019-08-12 2019-06-30 13F BOSTON PROPERTIES COM 101121101 10,244 534 5.50 1,321 1.69 0.0038
2019-05-15 2019-03-31 13F BOSTON PROPERTIES COM 101121101 9,710 43 0.44 1,299 19.39 0.0037
2019-02-13 2018-12-31 13F BOSTON PROPERTIES COM 101121101 9,667 -55 -0.57 1,088 -9.11 0.0037
2018-11-13 2018-09-30 13F BOSTON PROPERTIES COM 101121101 9,722 0 0.00 1,197 -1.80 0.0034
2018-08-10 2018-06-30 13F BOSTON PROPERTIES COM 101121101 9,722 -537 -5.23 1,219 -3.56 0.0037
2018-06-28 2018-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 10,259 436 4.44 1,264 -1.02 0.0041
2018-05-14 2018-03-31 13F BOSTON PROPERTIES COM 101121101 9,209 -614 1,135
2018-02-12 2017-12-31 13F BOSTON PROPERTIES COM 101121101 9,823 8 0.08 1,277 5.89 0.0040
2017-11-13 2017-09-30 13F BOSTON PROPERTIES COM 101121101 9,815 -75 -0.76 1,206 -0.90 0.0040
2017-08-14 2017-06-30 13F BOSTON PROPERTIES COM 101121101 9,890 -201 -1.99 1,217 -8.91 0.0037
2017-05-15 2017-03-31 13F BOSTON PROPERTIES COM 101121101 10,091 12 0.12 1,336 5.28 0.0046
2017-02-13 2016-12-31 13F BOSTON PROPERTIES COM 101121101 10,079 -13 -0.13 1,269 -7.71 0.0045
2016-11-14 2016-09-30 13F BOSTON PROPERTIES COM 101121101 10,092 -20 -0.20 1,375 3.07 0.0047
2016-08-09 2016-06-30 13F BOSTON PROPERTIES COM 101121101 10,112 114 1.14 1,334 5.04 0.0047
2016-05-13 2016-03-31 13F BOSTON PROPERTIES COM 101121101 9,998 105 1.06 1,270 0.63 0.0044
2016-02-08 2015-12-31 13F BOSTON PROPERTIES COM 101121101 9,893 274 2.85 1,262 10.80 0.0043
2015-11-13 2015-09-30 13F BOSTON PROPERTIES COM 101121101 9,619 1,679 21.15 1,139 18.52 0.0041
2015-08-11 2015-06-30 13F BOSTON PROPERTIES COM 101121101 7,940 -282 -3.43 961 -16.80 0.0031
2015-05-14 2015-03-31 13F BOSTON PROPERTIES COM 101121101 8,222 0 0.00 1,155 9.07 0.0037
2015-02-13 2014-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 8,222 0 0.00 1,059 11.24 0.0033
2015-02-09 2014-12-31 13F BOSTON PROPERTIES COM 101121101 8,317 1,043
2014-11-10 2014-09-30 13F BOSTON PROPERTIES COM 101121101 8,222 0 0.00 952 -1.96 0.0031
2014-08-08 2014-06-30 13F BOSTON PROPERTIES COM 101121101 8,222 0 0.00 971 3.08 0.0031
2014-05-13 2014-03-31 13F BOSTON PROPERTIES COM 101121101 8,222 -577 -6.56 942 6.68 0.0030
2014-02-11 2013-12-31 13F BOSTON PROPERTIES COM 101121101 8,799 -545 -5.83 883 -11.61 0.0029
2013-11-08 2013-09-30 13F BOSTON PROPERTIES COM 101121101 9,344 -170 -1.79 999 -0.40 0.0036
2013-08-13 2013-06-30 13F BOSTON PROPERTIES COM 101121101 9,514 9,514 1,003 0.0040
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.