Franklin Street Properties Corp.
US ˙ NYSEAM ˙ US35471R1068

SecurityFSP / Franklin Street Properties Corp.
InstitutionSimplex Trading, Llc
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Simplex Trading, Llc ownership in FSP / Franklin Street Properties Corp.

On May 14, 2026 - Simplex Trading, Llc filed a 13F-HR form disclosing ownership of 0 shares of Franklin Street Properties Corp. (US:FSP) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 88 shares of Franklin Street Properties Corp.. The current value of the position is $0 USD.

Simplex Trading, Llc has a history of taking positions in derivatives of the underlying security (FSP) in the form of stock options. The firm currently holds call options representing 4,400 of underlying shares valued at $2,926 USD and put options representing 27,500 of underlying shares valued at $18,287 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.

FSP / Franklin Street Properties Corp. 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)
2026-05-14 2026-03-31 13F FRANKLIN STR PPTYS COM 35471R106 0 -100.00 0
2026-02-11 2025-12-31 13F FRANKLIN STR PPTYS COM 35471R106 88 -8,248 -98.94 0 0.0000
2025-11-12 2025-09-30 13F FRANKLIN STR PPTYS COM 35471R106 8,336 2,219 36.28 0 0.0000
2025-08-05 2025-06-30 13F FRANKLIN STR PPTYS COM 35471R106 6,117 5,112 508.66 0 0.0000
2025-05-12 2025-03-31 13F FRANKLIN STR PPTYS COM 35471R106 1,005 1,005 0 0.0000
2024-11-08 2024-09-30 13F FRANKLIN STR PPTYS COM 35471R106 0 -3,669 -100.00 0 0.0000
2024-07-25 2024-06-30 13F FRANKLIN STR PPTYS COM 35471R106 3,669 213 6.16 0 0.0000
2024-04-25 2024-03-31 13F FRANKLIN STR PPTYS COM 35471R106 3,456 -639 -15.60 0 0.0000
2024-02-02 2023-12-31 13F FRANKLIN STR PPTYS COM 35471R106 4,095 1,913 87.67 0 0.0000
2023-11-01 2023-09-30 13F FRANKLIN STR PPTYS COM 35471R106 2,182 -25,469 -92.11 0 0.0000
2023-08-04 2023-06-30 13F FRANKLIN STR PPTYS COM 35471R106 27,651 -9,025 -24.61 0 0.0000
2023-04-27 2023-03-31 13F FRANKLIN STR PPTYS COM 35471R106 36,676 -34,585 -48.53 0 0.0001
2023-02-02 2022-12-31 13F FRANKLIN STR PPTYS COM 35471R106 71,261 48,717 216.10 0 -100.00 0.0002
2022-11-04 2022-09-30 13F FRANKLIN STR PPTYS COM 35471R106 22,544 22,544 59 0.0001
2022-05-02 2022-03-31 13F FRANKLIN STR PPTYS COM 35471R106 0 -361 -100.00 0 -100.00
2022-02-04 2021-12-31 13F FRANKLIN STR PPTYS COM 35471R106 361 0 0.00 1 0.00 0.0000
2021-10-28 2021-09-30 13F FRANKLIN STR PPTYS COM 35471R106 361 0 0.00 1 0.00 0.0000
2021-08-12 2021-06-30 13F FRANKLIN STR PPTYS COM 35471R106 361 361 1 0.0000
2021-04-26 2021-03-31 13F FRANKLIN STR PPTYS COM 35471R106 0 -2,007 -100.00 0 -100.00
2021-02-02 2020-12-31 13F FRANKLIN STR PPTYS COM 35471R106 2,007 -1,765 -46.79 8 -38.46 0.0000
2020-10-14 2020-09-30 13F FRANKLIN STR PPTYS COM 35471R106 3,772 692 22.47 13 -13.33 0.0000
2020-07-13 2020-06-30 13F FRANKLIN STR PPTYS COM 35471R106 3,080 3,015 4,638.46 15 0.0000
2019-07-26 2019-06-30 13F FRANKLIN STREET PPTYS COM 35471R106 65 65 -97.89 0 -100.00 0.0000
2017-10-25 2017-09-30 13F FRANKLIN STREET PPTYS COM 35471R106 0 -757 -100.00 0 -100.00
2017-07-12 2017-06-30 13F FRANKLIN STREET PPTYS COM 35471R106 757 293 63.15 8 60.00 0.0003
2017-04-21 2017-03-31 13F FRANKLIN STREET PPTYS COM 35471R106 464 464 5 0.0002
2016-10-07 2016-09-30 13F FRANKLIN STREET PPTYS COM 35471R106 0 -6,171 -100.00 0 -100.00
2016-07-18 2016-06-30 13F FRANKLIN STREET PPTYS COM 35471R106 6,171 1,395 29.21 75 50.00 0.0050
2016-04-14 2016-03-31 13F FRANKLIN STREET PPTYS COM 35471R106 4,776 4,776 50 0.0040
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
(%)
2026-05-14 2026-03-31 13F FRANKLIN STR PPTYS CALL Call 4,400 -13.73 3 -50.00 n/a n/a n/a
2026-02-11 2025-12-31 13F FRANKLIN STR PPTYS CALL Call 5,100 5 n/a n/a n/a
2025-08-05 2025-06-30 13F FRANKLIN STR PPTYS CALL Call 0 -100.00 0 n/a n/a n/a
2025-05-12 2025-03-31 13F FRANKLIN STR PPTYS CALL Call 900 0 n/a n/a n/a
2025-02-11 2024-12-31 13F ANGI CALL Call 0 -100.00 0 n/a n/a n/a
2024-11-08 2024-09-30 13F ANGI CALL Call 7,200 1.41 0 n/a n/a n/a
2024-07-25 2024-06-30 13F ANGI CALL Call 7,100 -19.32 0 n/a n/a n/a
2024-04-25 2024-03-31 13F ANGI CALL Call 8,800 282.61 0 n/a n/a n/a
2024-02-02 2023-12-31 13F ANGI CALL Call 2,300 -92.94 0 n/a n/a n/a
2024-02-02 2023-12-31 13F FRANKLIN STR PPTYS CALL Call 2,800 0 n/a n/a n/a
2023-11-01 2023-09-30 13F ANGI CALL Call 32,600 30.92 0 n/a n/a n/a
2023-08-04 2023-06-30 13F ANGI CALL Call 24,900 24,800.00 0 n/a n/a n/a
2023-04-27 2023-03-31 13F FRANKLIN STR PPTYS CALL Call 100 0.00 0 n/a n/a n/a
2023-04-27 2023-03-31 13F ANGI CALL Call 2,800 0 n/a n/a n/a
2023-02-02 2022-12-31 13F FRANKLIN STR PPTYS CALL Call 100 -99.89 0 -100.00 n/a n/a n/a
2023-02-02 2022-12-31 13F ANGI CALL Call 131,800 0 n/a n/a n/a
2022-11-04 2022-09-30 13F ANGI CALL Call 88,700 538.13 261 314.29 n/a n/a n/a
2022-08-03 2022-06-30 13F FRANKLIN STR PPTYS CALL Call 1,300 5 n/a n/a n/a
2022-08-03 2022-06-30 13F ANGI CALL Call 13,900 396.43 63 293.75 n/a n/a n/a
2022-05-02 2022-03-31 13F FRANKLIN STR PPTYS CALL Call 2,800 0.00 16 0.00 n/a n/a n/a
2022-05-02 2022-03-31 13F ANGI CALL Call 14,100 79 n/a n/a n/a
2022-02-23 2021-12-31 13F/A ANGI CALL Call 21,200 195 n/a n/a n/a
2022-02-23 2021-12-31 13F/A FRANKLIN STR PPTYS CALL Call 2,800 -87.56 16 -94.72 n/a n/a n/a
2022-02-04 2021-12-31 13F FRANKLIN STR PPTYS CALL Call 800 4 n/a n/a n/a
2022-02-04 2021-12-31 13F ANGI CALL Call 22,500 303 n/a n/a n/a
2021-10-28 2021-09-30 13F ANGI CALL Call 22,500 2,712.50 303 7,475.00 n/a n/a n/a
2021-10-28 2021-09-30 13F FRANKLIN STR PPTYS CALL Call 800 4 n/a n/a n/a
2021-08-12 2021-06-30 13F FRANKLIN STR PPTYS CALL Call 800 708.08 4 -92.45 n/a n/a n/a
2021-08-12 2021-06-30 13F ANGI CALL Call 22,300 301 n/a n/a n/a
2021-04-26 2021-03-31 13F FRANKLIN STR PPTYS CALL Call 99 -47.89 53 -78.80 n/a n/a n/a
2021-04-26 2021-03-31 13F ANGI CALL Call 415 539 n/a n/a n/a
2021-02-02 2020-12-31 13F FRANKLIN STR PPTYS CALL Call 1 0 n/a n/a n/a
2021-02-02 2020-12-31 13F ANGI HOMESERVICES CALL Call 190 -89.84 250 -87.95 n/a n/a n/a
2020-10-14 2020-09-30 13F ANGI HOMESERVICES CALL Call 1,870 103.70 2,074 86.01 n/a n/a n/a
2020-10-14 2020-09-30 13F FRANKLIN STR PPTYS CALL Call 1 0 n/a n/a n/a
2020-07-13 2020-06-30 13F ANGI HOMESERVICES CALL Call 918 1,076.92 1,115 2,687.50 n/a n/a n/a
2020-04-29 2020-03-31 13F ANGI HOMESERVICES CALL Call 78 -94.48 40 -96.65 n/a n/a n/a
2020-02-05 2019-12-31 13F ANGI HOMESERVICES CALL Call 1,412 782.50 1,195 957.52 n/a n/a n/a
2019-10-15 2019-09-30 13F ANGI HOMESERVICES CALL Call 160 -56.99 113 -76.60 n/a n/a n/a
2019-10-15 2019-09-30 13F FRANKLIN STREET PPTYS CALL Call 2 1 n/a n/a n/a
2019-07-26 2019-06-30 13F ANGI HOMESERVICES CALL Call 372 247.66 483 192.73 n/a n/a n/a
2019-04-18 2019-03-31 13F ANGI HOMESERVICES CALL Call 107 -52.23 165 -54.04 n/a n/a n/a
2019-01-16 2018-12-31 13F ANGI HOMESERVICES CALL Call 224 5,500.00 359 11,866.67 n/a n/a n/a
2018-10-23 2018-09-30 13F FRANKLIN STREET PPTYS CALL Call 4 -42.86 3 -40.00 n/a n/a n/a
2018-10-23 2018-09-30 13F ANGI HOMESERVICES CALL Call 201 471 n/a n/a n/a
2018-07-30 2018-06-30 13F FRANKLIN STREET PPTYS CALL Call 7 250.00 5 n/a n/a n/a
2018-07-30 2018-06-30 13F ANGI HOMESERVICES CALL Call 3 4 n/a n/a n/a
2018-04-26 2018-03-31 13F FRANKLIN STREET PPTYS CALL Call 2 -71.43 0 -100.00 n/a n/a n/a
2018-01-10 2017-12-31 13F FRANKLIN STREET PPTYS CALL Call 0 -100.00 0 n/a n/a n/a
2017-10-25 2017-09-30 13F FRANKLIN STREET PPTYS CALL Call 2 -71.43 0 n/a n/a n/a
2017-07-12 2017-06-30 13F FRANKLIN STREET PPTYS CALL Call 7 -12.50 0 n/a n/a n/a
2017-04-21 2017-03-31 13F FRANKLIN STREET PPTYS CALL Call 8 -73.33 0 -100.00 n/a n/a n/a
2017-01-11 2016-12-31 13F FRANKLIN STREET PPTYS CALL Call 30 -23.08 2 100.00 n/a n/a n/a
2016-10-07 2016-09-30 13F FRANKLIN STREET PPTYS CALL Call 39 105.26 1 -50.00 n/a n/a n/a
2016-07-18 2016-06-30 13F FRANKLIN STREET PPTYS CALL Call 19 0 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
(%)
2026-05-14 2026-03-31 13F FRANKLIN STR PPTYS PUT Put 27,500 27,400.00 18 n/a n/a n/a
2026-02-11 2025-12-31 13F FRANKLIN STR PPTYS PUT Put 100 0 n/a n/a n/a
2025-05-12 2025-03-31 13F ANGI PUT Put 0 -100.00 0 n/a n/a n/a
2025-02-11 2024-12-31 13F ANGI PUT Put 4,700 -7.84 0 n/a n/a n/a
2024-11-08 2024-09-30 13F ANGI PUT Put 5,100 10.87 0 n/a n/a n/a
2024-07-25 2024-06-30 13F FRANKLIN STR PPTYS PUT Put 4,600 130.00 0 n/a n/a n/a
2024-07-25 2024-06-30 13F ANGI PUT Put 6,900 0 n/a n/a n/a
2024-04-25 2024-03-31 13F ANGI PUT Put 2,000 -62.26 0 n/a n/a n/a
2024-04-25 2024-03-31 13F FRANKLIN STR PPTYS PUT Put 5,900 0 n/a n/a n/a
2024-02-02 2023-12-31 13F FRANKLIN STR PPTYS PUT Put 5,300 783.33 0 n/a n/a n/a
2024-02-02 2023-12-31 13F ANGI PUT Put 400 0 n/a n/a n/a
2023-11-01 2023-09-30 13F ANGI PUT Put 600 -94.50 0 n/a n/a n/a
2023-11-01 2023-09-30 13F FRANKLIN STR PPTYS PUT Put 100 0 n/a n/a n/a
2023-08-04 2023-06-30 13F ANGI PUT Put 10,900 21.11 0 n/a n/a n/a
2023-04-27 2023-03-31 13F ANGI PUT Put 9,000 -73.76 0 n/a n/a n/a
2023-02-02 2022-12-31 13F ANGI PUT Put 34,300 -40.96 0 -100.00 n/a n/a n/a
2022-11-04 2022-09-30 13F ANGI PUT Put 58,100 4.31 171 -32.94 n/a n/a n/a
2022-08-03 2022-06-30 13F ANGI PUT Put 55,700 -20.99 255 -36.09 n/a n/a n/a
2022-08-03 2022-06-30 13F FRANKLIN STR PPTYS PUT Put 200 0 n/a n/a n/a
2022-05-02 2022-03-31 13F ANGI PUT Put 70,500 249.01 399 114.52 n/a n/a n/a
2022-05-02 2022-03-31 13F FRANKLIN STR PPTYS PUT Put 100 0 n/a n/a n/a
2022-02-23 2021-12-31 13F/A ANGI PUT Put 20,200 10,000.00 186 18,500.00 n/a n/a n/a
2022-02-04 2021-12-31 13F FRANKLIN STR PPTYS PUT Put 200 1 n/a n/a n/a
2022-02-04 2021-12-31 13F ANGI PUT Put 26,300 355 n/a n/a n/a
2021-10-28 2021-09-30 13F FRANKLIN STR PPTYS PUT Put 200 0.00 1 0.00 n/a n/a n/a
2021-10-28 2021-09-30 13F ANGI PUT Put 26,300 355 n/a n/a n/a
2021-08-12 2021-06-30 13F FRANKLIN STR PPTYS PUT Put 200 19,900.00 1 -99.71 n/a n/a n/a
2021-08-12 2021-06-30 13F ANGI PUT Put 26,300 355 n/a n/a n/a
2021-04-26 2021-03-31 13F FRANKLIN STR PPTYS PUT Put 1 -50.00 0 n/a n/a n/a
2021-04-26 2021-03-31 13F ANGI PUT Put 269 349 n/a n/a n/a
2021-02-02 2020-12-31 13F FRANKLIN STR PPTYS PUT Put 2 -99.80 0 -100.00 n/a n/a n/a
2021-02-02 2020-12-31 13F ANGI HOMESERVICES PUT Put 905 1,194 n/a n/a n/a
2020-10-14 2020-09-30 13F ANGI HOMESERVICES PUT Put 979 1,531.67 1,086 3,520.00 n/a n/a n/a
2020-10-14 2020-09-30 13F FRANKLIN STR PPTYS PUT Put 11 4 n/a n/a n/a
2020-07-13 2020-06-30 13F FRANKLIN STR PPTYS PUT Put 60 -36.17 30 -38.78 n/a n/a n/a
2020-07-13 2020-06-30 13F ANGI HOMESERVICES PUT Put 330 400 n/a n/a n/a
2020-04-29 2020-03-31 13F ANGI HOMESERVICES PUT Put 94 -39.35 49 -62.60 n/a n/a n/a
2020-02-05 2019-12-31 13F ANGI HOMESERVICES PUT Put 155 -46.92 131 -36.41 n/a n/a n/a
2020-02-05 2019-12-31 13F FRANKLIN STREET PPTYS PUT Put 1 0 n/a n/a n/a
2019-10-15 2019-09-30 13F ANGI HOMESERVICES PUT Put 292 94.67 206 5.64 n/a n/a n/a
2019-10-15 2019-09-30 13F FRANKLIN STREET PPTYS PUT Put 13 10 n/a n/a n/a
2019-07-26 2019-06-30 13F ANGI HOMESERVICES PUT Put 150 167.86 195 126.74 n/a n/a n/a
2019-07-26 2019-06-30 13F FRANKLIN STREET PPTYS PUT Put 22 16 n/a n/a n/a
2019-04-18 2019-03-31 13F ANGI HOMESERVICES PUT Put 56 69.70 86 62.26 n/a n/a n/a
2019-01-16 2018-12-31 13F ANGI HOMESERVICES PUT Put 33 -95.27 53 -96.76 n/a n/a n/a
2018-10-23 2018-09-30 13F ANGI HOMESERVICES PUT Put 698 69,700.00 1,638 163,700.00 n/a n/a n/a
2018-10-23 2018-09-30 13F FRANKLIN STREET PPTYS PUT Put 4 3 n/a n/a n/a
2018-07-30 2018-06-30 13F ANGI HOMESERVICES PUT Put 1 1 n/a n/a n/a
2018-07-30 2018-06-30 13F FRANKLIN STREET PPTYS PUT Put 5 4 n/a n/a n/a
2018-01-10 2017-12-31 13F FRANKLIN STREET PPTYS PUT Put 0 -100.00 0 -100.00 n/a n/a n/a
2017-10-25 2017-09-30 13F FRANKLIN STREET PPTYS PUT Put 6 -40.00 0 -100.00 n/a n/a n/a
2017-07-12 2017-06-30 13F FRANKLIN STREET PPTYS PUT Put 10 0.00 1 0.00 n/a n/a n/a
2017-04-21 2017-03-31 13F FRANKLIN STREET PPTYS PUT Put 10 1 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.