Arcturus Therapeutics Holdings Inc.
US ˙ NasdaqGM ˙ US03969T1097

SecurityARCT / Arcturus Therapeutics Holdings Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership2,327 shares
Latest Disclosed Value $ 17,964
Citigroup Inc ownership in ARCT / Arcturus Therapeutics Holdings Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 2,327 shares of Arcturus Therapeutics Holdings Inc. (US:ARCT) valued at $17,964 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 5,731 shares of Arcturus Therapeutics Holdings Inc.. This represents a change in shares of -59.40% during the quarter. The current value of the position is $17,685 USD.

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

ARCT / Arcturus Therapeutics Holdings 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 ARCTURUS THERAPEUTICS HLDGS COM 03969T109 2,327 -3,404 -59.40 18 -51.43 0.0000
2026-02-13 2025-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 5,731 2,990 109.08 35 -30.00 0.0000
2025-11-10 2025-09-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 2,741 -13,847 -83.48 51 -76.74 0.0000
2025-08-11 2025-06-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 16,588 -39,454 -70.40 216 -63.74 0.0001
2025-05-12 2025-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 56,042 -2,487 -4.25 593 -40.28 0.0003
2025-02-12 2024-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 58,529 38,914 198.39 993 118.24 0.0006
2024-11-12 2024-09-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 19,615 4,680 31.34 455 25.34 0.0003
2024-08-12 2024-06-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 14,935 -121,472 -89.05 364 -92.12 0.0002
2024-05-10 2024-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 136,407 87,535 179.11 4,606 199.09 0.0030
2024-02-09 2023-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 48,872 -8,453 -14.75 1,541 5.19 0.0011
2023-12-06 2023-09-30 13F/A-1 ARCTURUS THERAPEUTICS HLDGS COM 03969T109 57,325 3,780 7.06 1,465 -4.63 0.0011
2023-11-09 2023-09-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 57,325 3,780 1,465 0.0004
2023-08-10 2023-06-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 53,545 -78,546 -59.46 1,536 -51.52 0.0010
2023-05-11 2023-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 132,091 39,477 42.63 3,166 101.66 0.0022
2023-02-09 2022-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 92,614 -80,512 -46.50 1,571 -38.82 0.0013
2022-11-10 2022-09-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 173,126 46,252 36.46 2,566 28.49 0.0018
2022-08-10 2022-06-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 126,874 80,559 173.94 1,997 59.89 0.0015
2022-05-12 2022-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 46,315 -83,509 -64.32 1,249 -74.01 0.0008
2022-02-10 2021-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 129,824 65,188 100.85 4,805 55.60 0.0026
2021-11-10 2021-09-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 64,636 -78,871 -54.96 3,088 -36.41 0.0018
2021-08-10 2021-06-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 143,507 59,686 71.21 4,856 40.27 0.0029
2021-05-13 2021-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 83,821 50,862 154.32 3,462 142.10 0.0022
2021-02-11 2020-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 32,959 30,641 1,321.87 1,430 1,344.44 0.0008
2020-11-12 2020-09-30 13F ARCTURUS THERAPEUTICS HLDGS COM 03969T109 2,318 -2,460 -51.49 99 -55.61 0.0001
2020-08-12 2020-06-30 13F ARCTURUS THERAPEUTICS HLDG I COM 03969T109 4,778 3,163 195.85 223 913.64 0.0002
2020-05-12 2020-03-31 13F ARCTURUS THERAPEUTICS HLDG I COM 03969T109 1,615 1,444 844.44 22 1,000.00 0.0000
2020-02-12 2019-12-31 13F ARCTURUS THERAPEUTICS HLDG I COM 03969T109 171 0 0.00 2 0.00 0.0000
2019-11-08 2019-09-30 13F ARCTURUS THERAPEUTICS HLDG I COM 03969T109 171 0 0.00 2 0.00 0.0000
2019-08-12 2019-06-30 13F ARCTURUS THERAPEUTICS HLDG I COM 03969T109 171 0 0.00 2 100.00 0.0000
2019-05-13 2019-03-31 13F ARCTURUS THERAPEUTICS SHS M1492T105 171 0 0.00 1 0.00 0.0000
2019-02-12 2018-12-31 13F ARCTURUS THERAPEUTICS SHS M1492T105 171 0 0.00 1 -50.00 0.0000
2018-11-13 2018-09-30 13F ARCTURUS THERAPEUTICS SHS M1492T105 171 0 0.00 2 100.00 0.0000
2018-08-10 2018-06-30 13F ARCTURUS THERAPEUTICS SHS M1492T105 171 0 0.00 1 0.00 0.0000
2018-05-11 2018-03-31 13F ARCTURUS THERAPEUTICS SHS M1492T105 171 0 0.00 1 0.00 0.0000
2018-02-12 2017-12-31 13F ARCTURUS THERAPEUTICS SHS M1492T105 171 171 1 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
(%)
2025-05-12 2025-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-12 2024-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM Call 24,000 407 n/a n/a n/a
2024-02-09 2023-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-12-06 2023-09-30 13F/A ARCTURUS THERAPEUTICS HLDGS COM Call 29,000 741 n/a n/a n/a
2023-11-09 2023-09-30 13F ARCTURUS THERAPEUTICS HLDGS COM Call 29,000 741 n/a n/a n/a
2023-05-11 2023-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-02-09 2022-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM Call 35,000 594 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
(%)
2025-05-12 2025-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-12 2024-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM Put 24,000 407 n/a n/a n/a
2024-02-09 2023-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-12-06 2023-09-30 13F/A ARCTURUS THERAPEUTICS HLDGS COM Put 29,000 741 n/a n/a n/a
2023-11-09 2023-09-30 13F ARCTURUS THERAPEUTICS HLDGS COM Put 29,000 741 n/a n/a n/a
2023-05-11 2023-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-02-09 2022-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM Put 35,000 594 n/a n/a n/a
2021-05-13 2021-03-31 13F ARCTURUS THERAPEUTICS HLDGS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F ARCTURUS THERAPEUTICS HLDGS COM Put 25,100 1,089 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.