Research Frontiers Incorporated
US ˙ NasdaqCM ˙ US7609111072

SecurityREFR / Research Frontiers Incorporated
InstitutionNorthern Trust Corp
Latest Disclosed Ownership52,630 shares
Latest Disclosed Value $ 48,420
Northern Trust Corp ownership in REFR / Research Frontiers Incorporated

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 52,630 shares of Research Frontiers Incorporated (US:REFR) valued at $47,472 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 52,630 shares of Research Frontiers Incorporated. This represents a change in shares of 0.00% during the quarter. The current value of the position is $39,472 USD.

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 RESEARCH FRONTIERS COM 760911107 52,630 0 0.00 48 -29.41 0.0000
2026-02-17 2025-12-31 13F RESEARCH FRONTIERS COM 760911107 52,630 736 1.42 69 -17.07 0.0000
2025-11-14 2025-09-30 13F RESEARCH FRONTIERS COM 760911107 51,894 0 0.00 83 -3.53 0.0000
2025-08-13 2025-06-30 13F RESEARCH FRONTIERS COM 760911107 51,894 0 0.00 85 46.55 0.0000
2025-05-13 2025-03-31 13F RESEARCH FRONTIERS COM 760911107 51,894 0 0.00 59 -34.09 0.0000
2025-02-14 2024-12-31 13F RESEARCH FRONTIERS COM 760911107 51,894 -1,227 -2.31 89 -24.14 0.0000
2024-11-13 2024-09-30 13F RESEARCH FRONTIERS COM 760911107 53,121 -772 -1.43 116 17.17 0.0000
2024-08-14 2024-06-30 13F RESEARCH FRONTIERS COM 760911107 53,893 -111 -0.21 99 41.43 0.0000
2024-05-14 2024-03-31 13F RESEARCH FRONTIERS COM 760911107 54,004 0 0.00 70 29.63 0.0000
2024-02-13 2023-12-31 13F RESEARCH FRONTIERS COM 760911107 54,004 -3,274 -5.72 55 -11.48 0.0000
2023-11-13 2023-09-30 13F RESEARCH FRONTIERS COM 760911107 57,278 0 0.00 62 -32.97 0.0000
2023-08-11 2023-06-30 13F RESEARCH FRONTIERS COM 760911107 57,278 -180 -0.31 92 -7.14 0.0000
2023-05-15 2023-03-31 13F RESEARCH FRONTIERS COM 760911107 57,458 4,276 8.04 98 -2.97 0.0000
2023-02-13 2022-12-31 13F RESEARCH FRONTIERS COM 760911107 53,182 0 0.00 102 -10.62 0.0000
2022-11-14 2022-09-30 13F RESEARCH FRONTIERS COM 760911107 53,182 0 0.00 113 21.51 0.0000
2022-08-12 2022-06-30 13F RESEARCH FRONTIERS COM 760911107 53,182 -3,049 -5.42 93 -13.89 0.0000
2022-05-13 2022-03-31 13F RESEARCH FRONTIERS COM 760911107 56,231 0 0.00 108 11.34 0.0000
2022-02-08 2021-12-31 13F RESEARCH FRONTIERS COM 760911107 56,231 -117 -0.21 97 -32.64 0.0000
2021-11-15 2021-09-30 13F RESEARCH FRONTIERS COM 760911107 56,348 0 0.00 144 7.46 0.0000
2021-08-13 2021-06-30 13F RESEARCH FRONTIERS COM 760911107 56,348 -229,678 -80.30 134 -83.52 0.0000
2021-05-12 2021-03-31 13F RESEARCH FRONTIERS COM 760911107 286,026 -25,287 -8.12 813 -7.09 0.0002
2021-02-11 2020-12-31 13F RESEARCH FRONTIERS COM 760911107 311,313 1,893 0.61 875 4.79 0.0002
2020-11-16 2020-09-30 13F RESEARCH FRONTIERS COM 760911107 309,420 196,147 173.16 835 81.13 0.0002
2020-08-14 2020-06-30 13F RESEARCH FRONTIERS COM 760911107 113,273 53,281 88.81 461 226.95 0.0001
2020-05-14 2020-03-31 13F RESEARCH FRONTIERS COM 760911107 59,992 -337 -0.56 141 -22.53 0.0000
2020-02-14 2019-12-31 13F RESEARCH FRONTIERS COM 760911107 60,329 4,670 8.39 182 2.25 0.0000
2019-11-13 2019-09-30 13F RESEARCH FRONTIERS COM 760911107 55,659 16,744 43.03 178 37.98 0.0000
2019-08-13 2019-06-30 13F RESEARCH FRONTIERS COM 760911107 38,915 -2,215 -5.39 129 44.94 0.0000
2019-05-13 2019-03-31 13F RESEARCH FRONTIERS COM 760911107 41,130 0 0.00 89 36.92 0.0000
2019-02-12 2018-12-31 13F RESEARCH FRONTIERS COM 760911107 41,130 -2,259 -5.21 65 -4.41 0.0000
2018-11-14 2018-09-30 13F RESEARCH FRONTIERS COM 760911107 43,389 0 0.00 68 88.89 0.0000
2018-09-18 2018-06-30 13F/A-1 RESEARCH FRONTIERS COM 760911107 43,389 0 0.00 36 -16.28 0.0000
2018-08-14 2018-06-30 13F RESEARCH FRONTIERS COM 760911107 43,389 0 36
2018-05-09 2018-03-31 13F RESEARCH FRONTIERS COM 760911107 43,389 0 0.00 43 -4.44 0.0000
2018-02-14 2017-12-31 13F RESEARCH FRONTIERS COM 760911107 43,389 0 0.00 45 -13.46 0.0000
2017-11-13 2017-09-30 13F RESEARCH FRONTIERS COM 760911107 43,389 0 0.00 52 -7.14 0.0000
2017-08-11 2017-06-30 13F RESEARCH FRONTIERS COM 760911107 43,389 0 0.00 56 -8.20 0.0000
2017-05-12 2017-03-31 13F RESEARCH FRONTIERS COM 760911107 43,389 3,394 8.49 61 -16.44 0.0000
2017-02-13 2016-12-31 13F RESEARCH FRONTIERS COM 760911107 39,995 1,259 3.25 73 -27.72 0.0000
2016-11-09 2016-09-30 13F RESEARCH FRONTIERS COM 760911107 38,736 49 0.13 101 -28.37 0.0000
2016-08-12 2016-06-30 13F RESEARCH FRONTIERS COM 760911107 38,687 5,820 17.71 141 -6.00 0.0000
2016-08-19 2016-03-31 13F/A-1 RESEARCH FRONTIERS COM 760911107 32,867 0 0.00 150 -12.79 0.0000
2016-05-13 2016-03-31 13F RESEARCH FRONTIERS COM 760911107 32,867 150
2016-02-12 2015-12-31 13F RESEARCH FRONTIERS COM 760911107 32,867 0 0.00 172 3.61 0.0001
2015-11-12 2015-09-30 13F RESEARCH FRONTIERS COM 760911107 32,867 32,867 0.00 166 0.0001
2015-08-13 2015-06-30 13F RESEARCH FRONTIERS COM 760911107 0 -36,932 -100.00 0 -100.00
2015-05-14 2015-03-31 13F RESEARCH FRONTIERS COM 760911107 36,932 -3,173 -7.91 225 9.76 0.0001
2015-02-12 2014-12-31 13F RESEARCH FRONTIERS COM 760911107 40,105 0 0.00 205 -11.26 0.0001
2014-11-13 2014-09-30 13F RESEARCH FRONTIERS COM 760911107 40,105 -119 -0.30 231 -5.33 0.0001
2014-08-14 2014-06-30 13F RESEARCH FRONTIERS COM 760911107 40,224 -194 -0.48 244 16.19 0.0001
2014-05-14 2014-03-31 13F RESEARCH FRONTIERS COM 760911107 40,418 378 0.94 210 -9.48 0.0001
2014-02-21 2013-12-31 13F/A-1 RESEARCH FRONTIERS COM 760911107 40,040 -3,084 -7.15 232 26.78 0.0001
2014-02-12 2013-12-31 13F RESEARCH FRONTIERS COM 760911107 40,040 232
2013-11-13 2013-09-30 13F RESEARCH FRONTIERS COM 760911107 43,124 -1,090 -2.47 183 3.98 0.0001
2013-08-09 2013-06-30 13F RESEARCH FRONTIERS COM 760911107 44,214 44,214 176 0.0001
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.