보스턴 프로퍼티, Inc.
MX ˙ BMV ˙ US1011211018
SecurityMX:BXP / Boston Properties, Inc.
InstitutionStamos Capital Partners, L.p.
Latest Disclosed Ownership28,008 shares
Latest Disclosed Value $ 1,453,615
Stamos Capital Partners, L.p. reports 43.56% increase in ownership of BXP / Boston Properties, Inc.

On May 14, 2026 - Stamos Capital Partners, L.p. filed a 13F-HR form disclosing ownership of 28,008 shares of Boston Properties, Inc. (MX:BXP) valued at $1,453,615 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 19,509 shares of Boston Properties, Inc.. This represents a change in shares of 43.56% 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)
2026-05-14 2026-03-31 13F BXP COM 101121101 28,008 8,499 43.56 1,454 10.41 0.2272
2026-02-12 2025-12-31 13F BXP COM 101121101 19,509 8,678 80.12 1,316 63.48 0.2115
2025-11-13 2025-09-30 13F BXP COM 101121101 10,831 -8,471 -43.89 805 -38.17 0.1519
2025-08-14 2025-06-30 13F BXP COM 101121101 19,302 4,435 29.83 1,302 30.46 0.2336
2025-05-14 2025-03-31 13F BXP COM 101121101 14,867 1,477 11.03 999 0.30 0.2613
2025-02-13 2024-12-31 13F BXP COM 101121101 13,390 -1,790 -11.79 996 -18.51 0.2337
2024-11-13 2024-09-30 13F BXP COM 101121101 15,180 -6,790 -30.91 1,221 -9.69 0.2874
2024-08-13 2024-06-30 13F BOSTON PROPERTIES COM 101121101 21,970 2,750 14.31 1,352 7.73 0.2869
2024-05-14 2024-03-31 13F BOSTON PROPERTIES COM 101121101 19,220 5,350 38.57 1,255 28.98 0.2849
2024-02-13 2023-12-31 13F BOSTON PROPERTIES COM 101121101 13,870 -10,080 -42.09 973 -31.67 0.2641
2023-11-13 2023-09-30 13F BOSTON PROPERTIES COM 101121101 23,950 8,460 54.62 1,425 59.64 0.3173
2023-08-11 2023-06-30 13F BOSTON PROPERTIES COM 101121101 15,490 15,490 892 0.2087
2023-05-12 2023-03-31 13F BOSTON PROPERTIES COM 101121101 0 -7,430 -100.00 0 -100.00
2023-02-13 2022-12-31 13F BOSTON PROPERTIES COM 101121101 7,430 -3,330 -30.95 502 -37.79 0.1589
2022-11-14 2022-09-30 13F BOSTON PROPERTIES COM 101121101 10,760 -5,640 -34.39 807 -44.69 0.2052
2022-08-12 2022-06-30 13F BOSTON PROPERTIES COM 101121101 16,400 0 0.00 1,459 -30.92 0.4412
2022-05-13 2022-03-31 13F BOSTON PROPERTIES COM 101121101 16,400 7,700 88.51 2,112 110.78 0.7050
2022-02-14 2021-12-31 13F BOSTON PROPERTIES COM 101121101 8,700 8,700 1,002 0.4649
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.