Tower Semiconductor Ltd.
US ˙ NasdaqGS ˙ IL0010823792

SecurityTSEM / Tower Semiconductor Ltd.
InstitutionCitigroup Inc
Latest Disclosed Ownership312,323 shares
Latest Disclosed Value $ 53,285,320
Citigroup Inc ownership in TSEM / Tower Semiconductor Ltd.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 312,323 shares of Tower Semiconductor Ltd. (US:TSEM) valued at $54,806,440 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 120,012 shares of Tower Semiconductor Ltd.. This represents a change in shares of 160.24% during the quarter. The current value of the position is $83,674,455 USD.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (TSEM) 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.

TSEM / Tower Semiconductor Ltd. 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 TOWER SEMICONDUCTOR SHS NEW M87915274 312,323 192,311 160.24 53,285 279.39 0.0114
2026-02-13 2025-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 120,012 56,246 88.21 14,046 209.16 0.0062
2025-11-10 2025-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 63,766 53,138 499.98 4,544 885.47 0.0020
2025-08-11 2025-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 10,628 737 7.45 461 33.62 0.0002
2025-05-12 2025-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 9,891 -114 -1.14 345 -33.40 0.0002
2025-02-12 2024-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 10,005 -102,348 -91.10 519 -89.59 0.0003
2024-11-12 2024-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 112,353 0 0.00 4,975 14.87 0.0029
2024-08-12 2024-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 112,353 -747,330 -86.93 4,330 -84.62 0.0028
2024-05-10 2024-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 859,683 -156,027 -15.36 28,157 -9.21 0.0185
2024-02-09 2023-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 1,015,710 18,543 1.86 31,014 27.03 0.0219
2023-12-06 2023-09-30 13F/A-1 TOWER SEMICONDUCTOR SHS NEW M87915274 997,167 67,633 7.28 24,414 -28.70 0.0183
2023-11-09 2023-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 997,167 67,633 24,414 0.0073
2023-08-10 2023-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 929,534 -26,387 -2.76 34,241 -15.70 0.0225
2023-05-11 2023-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 955,921 1,858 0.19 40,619 -2.07 0.0285
2023-02-09 2022-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 954,063 20,561 2.20 41,477 1.44 0.0330
2022-11-10 2022-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 933,502 440,842 89.48 40,887 78.65 0.0293
2022-08-10 2022-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 492,660 464,277 1,635.76 22,887 1,563.30 0.0170
2022-05-12 2022-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 28,383 9,882 53.41 1,376 86.96 0.0008
2022-02-10 2021-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 18,501 9,324 101.60 736 165.70 0.0004
2021-11-10 2021-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 9,177 -12,586 -57.83 277 -56.92 0.0002
2021-08-10 2021-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 21,763 428 2.01 643 8.07 0.0004
2021-05-13 2021-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 21,335 -5,085 -19.25 595 -13.27 0.0004
2021-02-11 2020-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 26,420 -56,911 -68.30 686 -55.83 0.0004
2020-11-12 2020-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 83,331 44,550 114.88 1,553 109.58 0.0010
2020-08-12 2020-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 38,781 16,660 75.31 741 107.56 0.0006
2020-05-12 2020-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 22,121 22,121 357 0.0003
2020-02-12 2019-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 0 -296 -100.00 0 -100.00
2019-11-08 2019-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 296 -109 -26.91 6 0.00 0.0000
2019-08-12 2019-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 405 -415 -50.61 6 -53.85 0.0000
2019-05-13 2019-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 820 -9,975 -92.40 13 -91.98 0.0000
2019-02-12 2018-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 10,795 -3,299 -23.41 162 -47.06 0.0002
2018-11-13 2018-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 14,094 -11,772 -45.51 306 -46.69 0.0003
2018-08-10 2018-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 25,866 -31,011 -54.52 574 -62.51 0.0005
2018-05-11 2018-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 56,877 51,379 934.50 1,531 710.05 0.0013
2018-02-12 2017-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 5,498 -69,644 -92.68 189 -91.83 0.0002
2017-11-13 2017-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 75,142 7,720 11.45 2,313 42.08 0.0019
2017-08-11 2017-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 67,422 -36,172 -34.92 1,628 -32.08 0.0015
2017-05-12 2017-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 103,594 -372,738 -78.25 2,397 -73.73 0.0021
2017-02-10 2016-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 476,332 -41,055 -7.94 9,126 16.20 0.0082
2016-11-10 2016-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 517,387 499,797 2,841.37 7,854 3,640.00 0.0073
2016-08-12 2016-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 17,590 -2,366 -11.86 210 -14.63 0.0002
2016-05-13 2016-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 19,956 19,309 2,984.39 246 2,633.33 0.0003
2016-02-12 2015-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 647 -160,857 -99.60 9 -99.56 0.0000
2015-11-13 2015-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 161,504 77,312 91.83 2,061 57.21 0.0019
2015-08-13 2015-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 84,192 78,955 1,507.64 1,311 1,373.03 0.0012
2015-05-14 2015-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 5,237 4,004 324.74 89 456.25 0.0001
2015-02-17 2014-12-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 1,233 1,212 5,771.43 16 0.0000
2014-11-14 2014-09-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 21 -2,678 -99.22 0 -100.00
2014-08-14 2014-06-30 13F TOWER SEMICONDUCTOR SHS NEW M87915274 2,699 2,185 425.10 24 380.00 0.0000
2014-05-15 2014-03-31 13F TOWER SEMICONDUCTOR SHS NEW M87915274 514 514 5 0.0000
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
(%)
2025-11-10 2025-09-30 13F TOWER SEMICONDUCTOR SHS NEW Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-11 2025-06-30 13F TOWER SEMICONDUCTOR SHS NEW Call 8,000 347 n/a n/a n/a
2021-05-13 2021-03-31 13F TOWER SEMICONDUCTOR SHS NEW Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F TOWER SEMICONDUCTOR SHS NEW Call 1,800 -56.10 47 -38.16 n/a n/a n/a
2020-11-12 2020-09-30 13F TOWER SEMICONDUCTOR SHS NEW Call 4,100 241.67 76 230.43 n/a n/a n/a
2020-08-12 2020-06-30 13F TOWER SEMICONDUCTOR SHS NEW Call 1,200 -20.00 23 -4.17 n/a n/a n/a
2020-05-12 2020-03-31 13F TOWER SEMICONDUCTOR SHS NEW Call 1,500 -95.92 24 -97.27 n/a n/a n/a
2020-02-12 2019-12-31 13F TOWER SEMICONDUCTOR SHS NEW Call 36,800 -1.60 880 19.40 n/a n/a n/a
2019-11-08 2019-09-30 13F TOWER SEMICONDUCTOR SHS NEW Call 37,400 -35.18 737 -16.63 n/a n/a n/a
2019-08-12 2019-06-30 13F TOWER SEMICONDUCTOR SHS NEW Call 57,700 1,342.50 884 1,239.39 n/a n/a n/a
2019-05-13 2019-03-31 13F TOWER SEMICONDUCTOR SHS NEW Call 4,000 -87.62 66 -86.36 n/a n/a n/a
2019-02-12 2018-12-31 13F TOWER SEMICONDUCTOR SHS NEW Call 32,300 17.03 484 -19.47 n/a n/a n/a
2018-11-13 2018-09-30 13F TOWER SEMICONDUCTOR SHS NEW Call 27,600 32.69 601 30.37 n/a n/a n/a
2018-08-10 2018-06-30 13F TOWER SEMICONDUCTOR SHS NEW Call 20,800 -41.90 461 -52.18 n/a n/a n/a
2018-05-11 2018-03-31 13F TOWER SEMICONDUCTOR SHS NEW Call 35,800 -37.30 964 -50.92 n/a n/a n/a
2018-02-12 2017-12-31 13F TOWER SEMICONDUCTOR SHS NEW Call 57,100 156.05 1,964 185.88 n/a n/a n/a
2017-11-13 2017-09-30 13F TOWER SEMICONDUCTOR SHS NEW Call 22,300 71.54 687 118.79 n/a n/a n/a
2017-08-11 2017-06-30 13F TOWER SEMICONDUCTOR SHS NEW Call 13,000 -65.43 314 -63.91 n/a n/a n/a
2017-05-12 2017-03-31 13F TOWER SEMICONDUCTOR SHS NEW Call 37,600 24.50 870 50.26 n/a n/a n/a
2017-02-10 2016-12-31 13F TOWER SEMICONDUCTOR SHS NEW Call 30,200 0.67 579 27.25 n/a n/a n/a
2016-11-10 2016-09-30 13F TOWER SEMICONDUCTOR SHS NEW Call 30,000 1,204.35 455 1,525.00 n/a n/a n/a
2016-08-12 2016-06-30 13F TOWER SEMICONDUCTOR SHS NEW Call 2,300 -54.90 28 -55.56 n/a n/a n/a
2016-05-13 2016-03-31 13F TOWER SEMICONDUCTOR SHS NEW Call 5,100 142.86 63 110.00 n/a n/a n/a
2016-02-12 2015-12-31 13F TOWER SEMICONDUCTOR SHS NEW Call 2,100 -58.82 30 -53.85 n/a n/a n/a
2015-11-13 2015-09-30 13F TOWER SEMICONDUCTOR SHS NEW Call 5,100 65 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
(%)
2021-05-13 2021-03-31 13F TOWER SEMICONDUCTOR SHS NEW Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F TOWER SEMICONDUCTOR SHS NEW Put 2,100 -25.00 55 5.77 n/a n/a n/a
2020-11-12 2020-09-30 13F TOWER SEMICONDUCTOR SHS NEW Put 2,800 -52.54 52 -53.98 n/a n/a n/a
2020-08-12 2020-06-30 13F TOWER SEMICONDUCTOR SHS NEW Put 5,900 25.53 113 48.68 n/a n/a n/a
2020-05-12 2020-03-31 13F TOWER SEMICONDUCTOR SHS NEW Put 4,700 -80.17 76 -86.60 n/a n/a n/a
2020-02-12 2019-12-31 13F TOWER SEMICONDUCTOR SHS NEW Put 23,700 9.72 567 33.10 n/a n/a n/a
2019-11-08 2019-09-30 13F TOWER SEMICONDUCTOR SHS NEW Put 21,600 -0.92 426 27.54 n/a n/a n/a
2019-08-12 2019-06-30 13F TOWER SEMICONDUCTOR SHS NEW Put 21,800 541.18 334 496.43 n/a n/a n/a
2019-05-13 2019-03-31 13F TOWER SEMICONDUCTOR SHS NEW Put 3,400 -76.06 56 -73.71 n/a n/a n/a
2019-02-12 2018-12-31 13F TOWER SEMICONDUCTOR SHS NEW Put 14,200 0.00 213 -31.07 n/a n/a n/a
2018-11-13 2018-09-30 13F TOWER SEMICONDUCTOR SHS NEW Put 14,200 -24.06 309 -25.54 n/a n/a n/a
2018-08-10 2018-06-30 13F TOWER SEMICONDUCTOR SHS NEW Put 18,700 -21.43 415 -35.26 n/a n/a n/a
2018-05-11 2018-03-31 13F TOWER SEMICONDUCTOR SHS NEW Put 23,800 30.05 641 1.91 n/a n/a n/a
2018-02-12 2017-12-31 13F TOWER SEMICONDUCTOR SHS NEW Put 18,300 1,730.00 629 1,929.03 n/a n/a n/a
2017-11-13 2017-09-30 13F TOWER SEMICONDUCTOR SHS NEW Put 1,000 -33.33 31 -13.89 n/a n/a n/a
2017-08-11 2017-06-30 13F TOWER SEMICONDUCTOR SHS NEW Put 1,500 -92.23 36 -91.95 n/a n/a n/a
2017-05-12 2017-03-31 13F TOWER SEMICONDUCTOR SHS NEW Put 19,300 -62.38 447 -54.53 n/a n/a n/a
2017-02-10 2016-12-31 13F TOWER SEMICONDUCTOR SHS NEW Put 51,300 143.13 983 207.19 n/a n/a n/a
2016-11-10 2016-09-30 13F TOWER SEMICONDUCTOR SHS NEW Put 21,100 170.51 320 244.09 n/a n/a n/a
2016-08-12 2016-06-30 13F TOWER SEMICONDUCTOR SHS NEW Put 7,800 7,700.00 93 9,200.00 n/a n/a n/a
2016-05-13 2016-03-31 13F TOWER SEMICONDUCTOR SHS NEW Put 100 0.00 1 0.00 n/a n/a n/a
2016-02-12 2015-12-31 13F TOWER SEMICONDUCTOR SHS NEW Put 100 -98.36 1 -98.72 n/a n/a n/a
2015-11-13 2015-09-30 13F TOWER SEMICONDUCTOR SHS NEW Put 6,100 78 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.