Boston Properties, Inc.
US ˙ NYSE ˙ US1011211018

SecurityBXP / Boston Properties, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership388,554 shares
Latest Disclosed Value $ 20,165,953
Citigroup Inc ownership in BXP / Boston Properties, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 388,554 shares of Boston Properties, Inc. (US:BXP) valued at $20,165,953 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 471,478 shares of Boston Properties, Inc.. This represents a change in shares of -17.59% during the quarter. The current value of the position is $23,662,939 USD.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (BXP) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

BXP / Boston Properties, Inc. Historical Put/Call Ratio
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)
2026-05-11 2026-03-31 13F BXP COM 101121101 388,554 -82,924 -17.59 20,166 -36.62 0.0086
2026-02-13 2025-12-31 13F BXP COM 101121101 471,478 285,226 153.14 31,815 129.79 0.0140
2025-11-10 2025-09-30 13F BXP COM 101121101 186,252 -50,967 -21.49 13,846 -13.50 0.0062
2025-08-11 2025-06-30 13F BXP COM 101121101 237,219 52,784 28.62 16,005 29.16 0.0079
2025-05-12 2025-03-31 13F BXP COM 101121101 184,435 58,506 46.46 12,392 32.34 0.0063
2025-02-12 2024-12-31 13F BXP COM 101121101 125,929 -42,354 -25.17 9,364 -30.84 0.0056
2024-11-12 2024-09-30 13F BXP COM 101121101 168,283 -20,603 -10.91 13,540 16.45 0.0078
2024-08-12 2024-06-30 13F BOSTON PROPERTIES COM 101121101 188,886 -6,663 -3.41 11,628 -8.96 0.0074
2024-05-10 2024-03-31 13F BOSTON PROPERTIES COM 101121101 195,549 55,932 40.06 12,771 30.37 0.0084
2024-02-09 2023-12-31 13F BOSTON PROPERTIES COM 101121101 139,617 6,560 4.93 9,797 23.78 0.0069
2023-12-06 2023-09-30 13F/A-1 BOSTON PROPERTIES COM 101121101 133,057 38,773 41.12 7,914 45.77 0.0059
2023-11-09 2023-09-30 13F BOSTON PROPERTIES COM 101121101 133,057 38,773 7,914 0.0024
2023-08-10 2023-06-30 13F BOSTON PROPERTIES COM 101121101 94,284 -130,973 -58.14 5,430 -55.46 0.0036
2023-05-11 2023-03-31 13F BOSTON PROPERTIES COM 101121101 225,257 -6,281 -2.71 12,191 -22.09 0.0085
2023-02-09 2022-12-31 13F BOSTON PROPERTIES COM 101121101 231,538 -182,381 -44.06 15,647 -49.58 0.0125
2022-11-10 2022-09-30 13F BOSTON PROPERTIES COM 101121101 413,919 171,283 70.59 31,031 43.73 0.0222
2022-08-10 2022-06-30 13F BOSTON PROPERTIES COM 101121101 242,636 2,741 1.14 21,590 -30.12 0.0161
2022-05-12 2022-03-31 13F BOSTON PROPERTIES COM 101121101 239,895 -57,139 -19.24 30,898 -9.69 0.0188
2022-02-10 2021-12-31 13F BOSTON PROPERTIES COM 101121101 297,034 -38,440 -11.46 34,212 -5.88 0.0183
2021-11-10 2021-09-30 13F BOSTON PROPERTIES COM 101121101 335,474 -66,513 -16.55 36,348 -21.09 0.0215
2021-08-10 2021-06-30 13F BOSTON PROPERTIES COM 101121101 401,987 -32,379 -7.45 46,063 4.72 0.0277
2021-05-13 2021-03-31 13F BOSTON PROPERTIES COM 101121101 434,366 3,688 0.86 43,985 8.04 0.0285
2021-02-11 2020-12-31 13F BOSTON PROPERTIES COM 101121101 430,678 -22,519 -4.97 40,711 11.87 0.0240
2020-11-12 2020-09-30 13F BOSTON PROPERTIES COM 101121101 453,197 252,438 125.74 36,392 100.56 0.0237
2020-08-12 2020-06-30 13F BOSTON PPTYS LTD PARTNERSHIP COM 101121101 200,759 38,164 23.47 18,145 20.99 0.0142
2020-05-12 2020-03-31 13F BOSTON PROPERTIES COM 101121101 162,595 -9,343 -5.43 14,997 -36.73 0.0136
2020-02-12 2019-12-31 13F BOSTON PROPERTIES COM 101121101 171,938 -27,385 -13.74 23,703 -8.28 0.0172
2019-11-08 2019-09-30 13F BOSTON PROPERTIES COM 101121101 199,323 -86,057 -30.16 25,843 -29.80 0.0205
2019-08-12 2019-06-30 13F BOSTON PROPERTIES COM 101121101 285,380 70,331 32.70 36,814 27.87 0.0297
2019-05-13 2019-03-31 13F BOSTON PROPERTIES COM 101121101 215,049 -14,797 -6.44 28,790 11.29 0.0278
2019-02-12 2018-12-31 13F BOSTON PROPERTIES COM 101121101 229,846 -85,752 -27.17 25,870 -33.40 0.0262
2018-11-13 2018-09-30 13F BOSTON PROPERTIES COM 101121101 315,598 94,490 42.73 38,846 40.08 0.0347
2018-08-10 2018-06-30 13F BOSTON PROPERTIES COM 101121101 221,108 710 0.32 27,732 2.12 0.0255
2018-05-11 2018-03-31 13F BOSTON PROPERTIES COM 101121101 220,398 1,996 0.91 27,157 -4.37 0.0224
2018-02-12 2017-12-31 13F BOSTON PROPERTIES COM 101121101 218,402 -9,562 -4.19 28,399 1.38 0.0228
2017-11-13 2017-09-30 13F BOSTON PROPERTIES COM 101121101 227,964 43,939 23.88 28,012 23.74 0.0229
2017-08-11 2017-06-30 13F BOSTON PROPERTIES COM 101121101 184,025 44,199 31.61 22,638 22.28 0.0204
2017-05-12 2017-03-31 13F BOSTON PROPERTIES COM 101121101 139,826 38,463 37.95 18,514 45.21 0.0165
2017-02-10 2016-12-31 13F BOSTON PROPERTIES COM 101121101 101,363 83,109 455.29 12,750 412.46 0.0115
2016-11-10 2016-09-30 13F BOSTON PROPERTIES COM 101121101 18,254 3,742 25.79 2,488 29.99 0.0023
2016-08-12 2016-06-30 13F BOSTON PROPERTIES COM 101121101 14,512 -16,035 -52.49 1,914 -50.70 0.0020
2016-05-13 2016-03-31 13F BOSTON PROPERTIES COM 101121101 30,547 2,379 8.45 3,882 8.04 0.0044
2016-02-12 2015-12-31 13F BOSTON PROPERTIES COM 101121101 28,168 -45,933 -61.99 3,593 -59.04 0.0036
2015-11-13 2015-09-30 13F BOSTON PROPERTIES COM 101121101 74,101 41,549 127.64 8,773 122.66 0.0082
2015-08-13 2015-06-30 13F BOSTON PROPERTIES COM 101121101 32,552 2,242 7.40 3,940 -7.47 0.0035
2015-05-14 2015-03-31 13F BOSTON PROPERTIES COM 101121101 30,310 10,643 54.12 4,258 68.23 0.0041
2015-02-17 2014-12-31 13F BOSTON PROPERTIES COM 101121101 19,667 -11,132 -36.14 2,531 -29.02 0.0023
2014-11-14 2014-09-30 13F BOSTON PROPERTIES COM 101121101 30,799 -14,264 -31.65 3,566 -33.03 0.0031
2014-08-14 2014-06-30 13F BOSTON PROPERTIES COM 101121101 45,063 -1,640 -3.51 5,325 -0.45 0.0051
2014-05-15 2014-03-31 13F BOSTON PROPERTIES COM 101121101 46,703 -11,436 -19.67 5,349 -8.33 0.0055
2014-02-14 2013-12-31 13F BOSTON PROPERTIES COM 101121101 58,139 -49,409 -45.94 5,835 -49.25 0.0053
2013-11-14 2013-09-30 13F BOSTON PROPERTIES COM 101121101 107,548 -69,420 -39.23 11,497 -38.40 0.0108
2013-08-14 2013-06-30 13F BOSTON PROPERTIES COM 101121101 176,968 176,968 18,664 0.0184
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2021-05-13 2021-03-31 13F BOSTON PROPERTIES COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F BOSTON PROPERTIES COM Call 26,000 0.00 2,458 17.72 n/a n/a n/a
2020-11-12 2020-09-30 13F BOSTON PROPERTIES COM Call 26,000 2,088 n/a n/a n/a
2020-08-12 2020-06-30 13F BOSTON PROPERTIES COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-05-12 2020-03-31 13F BOSTON PROPERTIES COM Call 30,000 -25.00 2,767 -49.82 n/a n/a n/a
2020-02-12 2019-12-31 13F BOSTON PROPERTIES COM Call 40,000 -46.09 5,514 -42.69 n/a n/a n/a
2019-11-08 2019-09-30 13F BOSTON PROPERTIES COM Call 74,200 394.67 9,621 397.21 n/a n/a n/a
2019-08-12 2019-06-30 13F BOSTON PROPERTIES COM Call 15,000 0.00 1,935 -3.64 n/a n/a n/a
2019-05-13 2019-03-31 13F BOSTON PROPERTIES COM Call 15,000 2,008 n/a n/a n/a
2018-11-13 2018-09-30 13F BOSTON PROPERTIES COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-08-10 2018-06-30 13F BOSTON PROPERTIES COM Call 200 100.00 25 108.33 n/a n/a n/a
2018-05-11 2018-03-31 13F BOSTON PROPERTIES COM Call 100 -75.00 12 -76.92 n/a n/a n/a
2018-02-12 2017-12-31 13F BOSTON PROPERTIES COM Call 400 52 n/a n/a n/a
2016-05-13 2016-03-31 13F BOSTON PROPERTIES COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2016-02-12 2015-12-31 13F BOSTON PROPERTIES COM Call 100,000 -8.26 12,754 -1.18 n/a n/a n/a
2015-11-13 2015-09-30 13F BOSTON PROPERTIES COM Call 109,000 12,906 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2024-08-12 2024-06-30 13F BOSTON PROPERTIES COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-05-10 2024-03-31 13F BOSTON PROPERTIES COM Put 36,300 0.00 2,371 -6.95 n/a n/a n/a
2024-02-09 2023-12-31 13F BOSTON PROPERTIES COM Put 36,300 2,547 n/a n/a n/a
2021-05-13 2021-03-31 13F BOSTON PROPERTIES COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F BOSTON PROPERTIES COM Put 26,000 0.00 2,458 17.72 n/a n/a n/a
2020-11-12 2020-09-30 13F BOSTON PROPERTIES COM Put 26,000 2,088 n/a n/a n/a
2020-08-12 2020-06-30 13F BOSTON PROPERTIES COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-05-12 2020-03-31 13F BOSTON PROPERTIES COM Put 30,000 0.00 2,767 -33.10 n/a n/a n/a
2020-02-12 2019-12-31 13F BOSTON PROPERTIES COM Put 30,000 -62.50 4,136 -60.13 n/a n/a n/a
2019-11-08 2019-09-30 13F BOSTON PROPERTIES COM Put 80,000 433.33 10,373 436.07 n/a n/a n/a
2019-08-12 2019-06-30 13F BOSTON PROPERTIES COM Put 15,000 0.00 1,935 -3.64 n/a n/a n/a
2019-05-13 2019-03-31 13F BOSTON PROPERTIES COM Put 15,000 2,008 n/a n/a n/a
2018-11-13 2018-09-30 13F BOSTON PROPERTIES COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2018-08-10 2018-06-30 13F BOSTON PROPERTIES COM Put 200 0.00 25 0.00 n/a n/a n/a
2018-05-11 2018-03-31 13F BOSTON PROPERTIES COM Put 200 -50.00 25 -51.92 n/a n/a n/a
2018-02-12 2017-12-31 13F BOSTON PROPERTIES COM Put 400 52 n/a n/a n/a
2016-05-13 2016-03-31 13F BOSTON PROPERTIES COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2016-02-12 2015-12-31 13F BOSTON PROPERTIES COM Put 1,000 128 n/a n/a n/a
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.