Boston Properties, Inc.
MX ˙ BMV ˙ US1011211018
SecurityMX:BXP / Boston Properties, Inc.
InstitutionPrincipal Financial Group Inc
Latest Disclosed Ownership234,329 shares
Latest Disclosed Value $ 12,161,676
Principal Financial Group Inc reports 65.18% decrease in ownership of BXP / Boston Properties, Inc.

On May 4, 2026 - Principal Financial Group Inc filed a 13F-HR form disclosing ownership of 234,329 shares of Boston Properties, Inc. (MX:BXP) valued at $12,161,676 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 672,952 shares of Boston Properties, Inc.. This represents a change in shares of -65.18% 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)
2026-05-04 2026-03-31 13F BXP COM 101121101 234,329 -438,623 -65.18 12,162 -73.22 0.0065
2026-02-02 2025-12-31 13F BXP COM 101121101 672,952 -3,412 -0.50 45,412 -9.69 0.0232
2025-11-04 2025-09-30 13F BXP COM 101121101 676,364 -16,170 -2.33 50,282 7.61 0.0254
2025-08-08 2025-06-30 13F BXP COM 101121101 692,534 -65,388 -8.63 46,726 -8.25 0.0247
2025-04-28 2025-03-31 13F BXP COM 101121101 757,922 5,087 0.68 50,925 -9.03 0.0286
2025-01-31 2024-12-31 13F BXP COM 101121101 752,835 112,702 17.61 55,981 8.69 0.0305
2024-10-31 2024-09-30 13F BXP COM 101121101 640,133 52,831 9.00 51,504 42.46 0.0284
2024-07-29 2024-06-30 13F BOSTON PROPERTIES COM 101121101 587,302 88,569 17.76 36,154 11.00 0.0215
2024-04-29 2024-03-31 13F BOSTON PROPERTIES COM 101121101 498,733 259,074 108.10 32,572 93.70 0.0191
2024-02-07 2023-12-31 13F BOSTON PROPERTIES COM 101121101 239,659 -1,680,523 -87.52 16,817 -85.28 0.0107
2023-11-02 2023-09-30 13F BOSTON PROPERTIES COM 101121101 1,920,182 -5,808 -0.30 114,211 2.97 0.0821
2023-08-07 2023-06-30 13F BOSTON PROPERTIES COM 101121101 1,925,990 2,913 0.15 110,918 6.57 0.0758
2023-05-09 2023-03-31 13F BOSTON PROPERTIES COM 101121101 1,923,077 1,709,663 801.10 104,077 621.65 0.0744
2023-02-09 2022-12-31 13F BOSTON PROPERTIES COM 101121101 213,414 -15,169 -6.64 14,423 -15.84 0.0109
2022-11-09 2022-09-30 13F BOSTON PROPERTIES COM 101121101 228,583 -12,947 -5.36 17,137 -20.26 0.0136
2022-08-10 2022-06-30 13F BOSTON PROPERTIES COM 101121101 241,530 -1,887 -0.78 21,492 -31.45 0.0159
2022-05-09 2022-03-31 13F BOSTON PROPERTIES COM 101121101 243,417 10,329 4.43 31,352 16.79 0.0124
2022-05-09 2022-03-31 13F BOSTON PROPERTIES COM 101121101 228,223 29,395
2022-02-09 2021-12-31 13F BOSTON PROPERTIES COM 101121101 233,088 -5,634 -2.36 26,845 3.79 0.0160
2021-11-09 2021-09-30 13F BOSTON PROPERTIES COM 101121101 238,722 -13,937 -5.52 25,865 -10.66 0.0169
2021-08-10 2021-06-30 13F BOSTON PROPERTIES COM 101121101 252,659 -1,224,624 -82.90 28,952 -80.65 0.0187
2021-05-10 2021-03-31 13F BOSTON PROPERTIES COM 101121101 1,477,283 147,739 11.11 149,590 19.02 0.1056
2021-02-23 2020-12-31 13F/A-1 BOSTON PROPERTIES COM 101121101 1,329,544 -1,182,476 -47.07 125,683 -37.69 0.0931
2021-02-08 2020-12-31 13F BOSTON PROPERTIES COM 101121101 1,329,544 -1,182,476 125,683 49,445.6291
2020-11-06 2020-09-30 13F BOSTON PROPERTIES COM 101121101 2,512,020 21,336 0.86 201,716 -10.39 0.1697
2020-08-05 2020-06-30 13F BOSTON PPTYS LTD PARTNERSHIP COM 101121101 2,490,684 151,363 6.47 225,107 4.34 0.1996
2020-05-12 2020-03-31 13F BOSTON PROPERTIES COM 101121101 2,339,321 -752,110 -24.33 215,752 -49.38 0.2388
2020-02-05 2019-12-31 13F BOSTON PROPERTIES COM 101121101 3,091,431 -32,872 -1.05 426,185 5.21 0.3551
2019-11-13 2019-09-30 13F BOSTON PROPERTIES COM 101121101 3,124,303 -84,838 -2.64 405,095 -2.15 0.3572
2019-08-12 2019-06-30 13F BOSTON PROPERTIES COM 101121101 3,209,141 150,967 4.94 413,980 1.11 0.3722
2019-05-10 2019-03-31 13F BOSTON PROPERTIES COM 101121101 3,058,174 1,335,446 77.52 409,428 111.16 0.3814
2019-02-14 2018-12-31 13F BOSTON PROPERTIES COM 101121101 1,722,728 -38,757 -2.20 193,893 -10.57 0.2066
2018-11-14 2018-09-30 13F BOSTON PROPERTIES COM 101121101 1,761,485 296,649 20.25 216,821 18.02 0.1911
2018-08-13 2018-06-30 13F BOSTON PROPERTIES COM 101121101 1,464,836 30,888 2.15 183,720 3.98 0.1689
2018-05-14 2018-03-31 13F BOSTON PROPERTIES COM 101121101 1,433,948 -76,783 -5.08 176,692 -10.05 0.1698
2018-02-12 2017-12-31 13F BOSTON PROPERTIES COM 101121101 1,510,731 -167,779 -10.00 196,440 -4.76 0.1809
2017-11-02 2017-09-30 13F BOSTON PROPERTIES COM 101121101 1,678,510 -834,866 -33.22 206,255 -33.29 0.2000
2017-08-08 2017-06-30 13F BOSTON PROPERTIES COM 101121101 2,513,376 -125,287 -4.75 309,196 -11.43 0.3099
2017-05-11 2017-03-31 13F BOSTON PROPERTIES COM 101121101 2,638,663 -225,583 -7.88 349,097 -3.10 0.4201
2017-02-13 2016-12-31 13F BOSTON PROPERTIES COM 101121101 2,864,246 -194,876 -6.37 360,264 -13.59 0.4570
2016-11-10 2016-09-30 13F BOSTON PROPERTIES COM 101121101 3,059,122 163,916 5.66 416,929 9.18 0.5507
2016-08-09 2016-06-30 13F BOSTON PROPERTIES COM 101121101 2,895,206 -167,700 -5.48 381,879 -1.89 0.5327
2016-05-10 2016-03-31 13F BOSTON PROPERTIES COM 101121101 3,062,906 45,383 1.50 389,233 1.14 0.5651
2016-02-09 2015-12-31 13F BOSTON PROPERTIES COM 101121101 3,017,523 464,595 18.20 384,855 27.32 0.5718
2015-11-12 2015-09-30 13F/A-1 BOSTON PROPERTIES COM 101121101 2,552,928 81,469 3.30 302,266 1.04 0.4749
2015-11-09 2015-09-30 13F BOSTON PROPERTIES COM 101121101 2,552,928 302,266
2015-08-10 2015-06-30 13F BOSTON PROPERTIES COM 101121101 2,471,459 -995 -0.04 299,146 -13.87 0.4461
2015-05-14 2015-03-31 13F/A-1 BOSTON PROPERTIES COM 101121101 2,472,454 198,838 8.75 347,329 18.71 0.5175
2015-05-12 2015-03-31 13F BOSTON PROPERTIES COM 101121101 2,472,454 347,330
2015-02-12 2014-12-31 13F BOSTON PROPERTIES COM 101121101 2,273,616 250,611 12.39 292,592 24.94 0.4546
2014-11-13 2014-09-30 13F BOSTON PROPERTIES COM 101121101 2,023,005 -104,897 -4.93 234,182 -6.88 0.3973
2014-08-12 2014-06-30 13F BOSTON PROPERTIES COM 101121101 2,127,902 241,143 12.78 251,474 16.37 0.4229
2014-05-13 2014-03-31 13F BOSTON PROPERTIES COM 101121101 1,886,759 145,842 8.38 216,091 23.67 0.3855
2014-02-12 2013-12-31 13F BOSTON PROPERTIES COM 101121101 1,740,917 -11,754 -0.67 174,735 -6.74 0.3261
2013-11-05 2013-09-30 13F BOSTON PROPERTIES COM 101121101 1,752,671 -170,670 -8.87 187,361 -7.64 0.3870
2013-08-12 2013-06-30 13F BOSTON PROPERTIES COM 101121101 1,923,341 1,923,341 202,855 0.4493
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.