보스턴 프로퍼티, Inc.
MX ˙ BMV ˙ US1011211018
SecurityMX:BXP / Boston Properties, Inc.
InstitutionCohen & Steers, Inc.
Latest Disclosed Ownership20,917,235 shares
Ownership 13.19%
Cohen & Steers, Inc. ownership in BXP / Boston Properties, Inc.

2026-05-15 - Cohen & Steers, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 20,917,235 shares of Boston Properties, Inc. (MX:BXP). This represents 13.19 percent ownership of the company. In their previous filing dated 2026-02-13 , Cohen & Steers, Inc. had reported owning 15,433,416 shares, indicating an increase of 35.53 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-05-15 2026-05-15 13G/A 15,433,416 20,917,235 35.53 13.19 35.42
2026-02-13 2026-02-13 13G/A 17,706,925 15,433,416 -12.84 9.74 -12.80
2026-02-06 2026-02-06 13G/A 10,940,598 17,706,925 61.85 11.17 61.65
2025-11-14 2025-11-14 13G 1,719,838 10,940,598 536.14 6.91 516.96
2015-02-17 2015-02-17 13G/A 1,719,838 1.12
2014-02-13 2014-02-13 13G/A 8,992,423 5.88
2013-03-08 2013-03-08 13G/A 7,135,195 4.72
2012-02-14 2012-02-14 13G/A 10,066,473 6.82

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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 20,849,327 5,466,437 35.54 1,082 4.24 1.8795
2026-02-13 2025-12-31 13F BXP COM 101121101 15,382,890 4,503,738 41.40 1,038 28.47 1.8768
2025-11-14 2025-09-30 13F BXP COM 101121101 10,879,152 5,761,843 112.60 809 134.20 1.4590
2025-08-14 2025-06-30 13F BXP COM 101121101 5,117,309 3,172,545 163.13 345 165.38 0.6332
2025-05-15 2025-03-31 13F BXP COM 101121101 1,944,764 1,944,446 611,461.01 131 0.2415
2025-02-13 2024-12-31 13F BXP COM 101121101 318 0 0.00 0 0.0000
2024-11-14 2024-09-30 13F BXP COM 101121101 318 -59 -15.65 0 0.0000
2024-08-13 2024-06-30 13F BXP COM 101121101 377 377 0 0.0000
2023-05-15 2023-03-31 13F Boston Properties COM 101121101 0 -180,000 -100.00 0 -100.00
2023-02-14 2022-12-31 13F Boston Properties COM 101121101 180,000 180,000 12,164 0.0268
2021-02-16 2020-12-31 13F Boston Properties COM 101121101 0 -9,013 -100.00 0 -100.00
2020-11-16 2020-09-30 13F Boston Properties COM 101121101 9,013 -371,307 -97.63 724 -97.89 0.0019
2020-08-14 2020-06-30 13F Boston Properties COM 101121101 380,320 71,472 23.14 34,373 20.67 0.0959
2020-05-15 2020-03-31 13F Boston Properties COM 101121101 308,848 -1,098,598 -78.06 28,485 -85.32 0.0919
2020-02-14 2019-12-31 13F Boston Properties COM 101121101 1,407,446 -308,349 -17.97 194,031 -12.78 0.4827
2019-11-14 2019-09-30 13F Boston Properties COM 101121101 1,715,795 199,549 13.16 222,470 13.74 0.5574
2019-08-14 2019-06-30 13F Boston Properties COM 101121101 1,516,246 -960,090 -38.77 195,596 -41.00 0.5425
2019-05-15 2019-03-31 13F Boston Properties COM 101121101 2,476,336 -2,555,878 -50.79 331,532 -41.46 0.9197
2019-02-14 2018-12-31 13F Boston Properties COM 101121101 5,032,214 -232,157 -4.41 566,376 -12.60 1.8018
2018-11-16 2018-09-30 13F/A-1 Boston Properties COM 101121101 5,264,371 -3,587,916 -40.53 647,991 -41.64 1.8839
2018-11-14 2018-09-30 13F Boston Properties COM 101121101 5,264,371 -3,587,916 647,991
2018-08-14 2018-06-30 13F Boston Properties COM 101121101 8,852,287 2,072,297 30.56 1,110,254 32.90 3.1795
2018-05-14 2018-03-31 13F Boston Properties COM 101121101 6,779,990 1,299,691 23.72 835,430 17.24 2.5554
2018-02-14 2017-12-31 13F Boston Properties COM 101121101 5,480,299 1,723,537 45.88 712,603 54.37 1.9694
2017-11-14 2017-09-30 13F Boston Properties COM 101121101 3,756,762 -397,704 -9.57 461,631 -9.68 1.2595
2017-08-14 2017-06-30 13F Boston Properties COM 101121101 4,154,466 1,254,540 43.26 511,082 33.10 1.3551
2017-05-15 2017-03-31 13F Boston Properties COM 101121101 2,899,926 2,554,241 738.89 383,979 783.12 1.0275
2017-02-14 2016-12-31 13F Boston Properties COM 101121101 345,685 129,835 60.15 43,480 47.80 0.1201
2016-11-14 2016-09-30 13F Boston Properties COM 101121101 215,850 0 0.00 29,418 3.33 0.0754
2016-08-22 2016-06-30 13F/A-2 Boston Properties COM 101121101 215,850 -5,009 -2.27 28,471 1.44 0.0737
2016-08-18 2016-06-30 13F/A-1 Boston Properties COM 101121101 16,358 -199,492 171 0.0004
2016-08-15 2016-06-30 13F Boston Properties COM 101121101 215,850 28,471
2016-05-16 2016-03-31 13F Boston Properties COM 101121101 220,859 0 0.00 28,067 -0.36 0.0777
2016-02-16 2015-12-31 13F Boston Properties COM 101121101 220,859 0 0.00 28,168 7.72 0.0810
2015-11-16 2015-09-30 13F Boston Properties COM 101121101 220,859 -624,873 -73.89 26,150 -74.45 0.0791
2015-08-14 2015-06-30 13F Boston Properties COM 101121101 845,732 -533,302 -38.67 102,367 -47.16 0.3106
2015-05-15 2015-03-31 13F Boston Properties COM 101121101 1,379,034 -340,804 -19.82 193,727 -12.47 0.5242
2015-02-17 2014-12-31 13F Boston Properties COM 101121101 1,719,838 -441,611 -20.43 221,326 -11.54 3.0591
2014-11-14 2014-09-30 13F Boston Properties COM 101121101 2,161,449 -1,599,287 -42.53 250,209 -43.70 0.7569
2014-08-14 2014-06-30 13F Boston Properties COM 101121101 3,760,736 -4,324,527 -53.49 444,444 -52.00 1.2731
2014-05-15 2014-03-31 13F Boston Properties COM 101121101 8,085,263 -907,160 -10.09 926,005 2.60 2.7993
2014-02-14 2013-12-31 13F Boston Properties COM 101121101 8,992,423 873,846 10.76 902,569 4.00 2.9485
2013-11-14 2013-09-30 13F Boston Properties COM 101121101 8,118,577 4,468,120 122.40 867,876 125.41 2.8015
2013-08-14 2013-06-30 13F Boston Properties COM 101121101 3,650,457 3,650,457 385,014 1.1965
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.