Soleno Therapeutics, Inc.
US ˙ NasdaqCM ˙ US8342033094
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT

SecuritySLNO / Soleno Therapeutics, Inc.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership386,545 shares
Latest Disclosed Value $ 12,941,527
Citadel Advisors Llc ownership in SLNO / Soleno Therapeutics, Inc.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 386,545 shares of Soleno Therapeutics, Inc. (US:SLNO) valued at $12,941,527 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 308,830 shares of Soleno Therapeutics, Inc.. This represents a change in shares of 25.16% during the quarter. The current value of the position is $20,490,750 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (SLNO) in the form of stock options. The firm currently holds call options representing 56,100 of underlying shares valued at $1,878,228 USD and put options representing 73,100 of underlying shares valued at $2,447,388 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.

Upgrade to unlock premium data and export to Excel .

Institutional Put/Call Ratios
(Premium Subscription Required)

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.

SLNO / Soleno Therapeutics, 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)
2026-05-15 2026-03-31 13F SOLENO THERAPEUTICS COM 834203309 386,545 77,715 25.16 12,942 -9.49 0.0018
2026-02-17 2025-12-31 13F SOLENO THERAPEUTICS COM 834203309 308,830 -141,296 -31.39 14,299 -53.01 0.0021
2025-11-14 2025-09-30 13F SOLENO THERAPEUTICS COM 834203309 450,126 -1,055,035 -70.09 30,429 -75.87 0.0046
2025-08-14 2025-06-30 13F SOLENO THERAPEUTICS COM 834203309 1,505,161 -70,883 -4.50 126,102 11.98 0.0219
2025-05-15 2025-03-31 13F SOLENO THERAPEUTICS COM 834203309 1,576,044 603,634 62.08 112,608 157.63 0.0214
2025-02-14 2024-12-31 13F SOLENO THERAPEUTICS COM 834203309 972,410 950,670 4,372.91 43,710 3,884.41 0.0076
2024-11-14 2024-09-30 13F SOLENO THERAPEUTICS COM 834203309 21,740 13,613 167.50 1,098 231.42 0.0002
2024-08-14 2024-06-30 13F SOLENO THERAPEUTICS COM 834203309 8,127 8,127 332 0.0001
2024-02-14 2023-12-31 13F SOLENO THERAPEUTICS COM 834203309 0 -40,625 -100.00 0 -100.00
2023-11-14 2023-09-30 13F SOLENO THERAPEUTICS COM 834203309 40,625 40,625 1,199 0.0003
2018-02-09 2017-12-31 13F SOLENO THERAPEUTICS Cmn 834203101 0 -27,368 -100.00 0 -100.00
2017-11-09 2017-09-30 13F SOLENO THERAPEUTICS Cmn 834203101 27,368 27,368 14 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
(%)
2026-05-15 2026-03-31 13F SOLENO THERAPEUTICS COM Call 56,100 -46.98 1,878 -61.66 n/a n/a n/a
2026-02-17 2025-12-31 13F SOLENO THERAPEUTICS COM Call 105,800 19.01 4,899 -18.49 n/a n/a n/a
2025-11-14 2025-09-30 13F SOLENO THERAPEUTICS COM Call 88,900 348.99 6,010 262.42 n/a n/a n/a
2025-08-14 2025-06-30 13F SOLENO THERAPEUTICS COM Call 19,800 -95.52 1,659 -94.75 n/a n/a n/a
2025-05-15 2025-03-31 13F SOLENO THERAPEUTICS COM Call 441,900 216.55 31,574 403.16 n/a n/a n/a
2025-02-14 2024-12-31 13F SOLENO THERAPEUTICS COM Call 139,600 982.17 6,275 863.90 n/a n/a n/a
2024-11-14 2024-09-30 13F SOLENO THERAPEUTICS COM Call 12,900 104.76 651 153.31 n/a n/a n/a
2024-08-14 2024-06-30 13F SOLENO THERAPEUTICS COM Call 6,300 -81.69 257 -82.54 n/a n/a n/a
2024-05-15 2024-03-31 13F SOLENO THERAPEUTICS COM Call 34,400 184.30 1,472 202.26 n/a n/a n/a
2024-02-14 2023-12-31 13F SOLENO THERAPEUTICS COM Call 12,100 487 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
(%)
2026-05-15 2026-03-31 13F SOLENO THERAPEUTICS COM Put 73,100 -62.99 2,447 -73.24 n/a n/a n/a
2026-02-17 2025-12-31 13F SOLENO THERAPEUTICS COM Put 197,500 119.93 9,144 50.64 n/a n/a n/a
2025-11-14 2025-09-30 13F SOLENO THERAPEUTICS COM Put 89,800 -36.67 6,070 -48.91 n/a n/a n/a
2025-08-14 2025-06-30 13F SOLENO THERAPEUTICS COM Put 141,800 144.06 11,880 186.20 n/a n/a n/a
2025-05-15 2025-03-31 13F SOLENO THERAPEUTICS COM Put 58,100 -69.55 4,151 -51.60 n/a n/a n/a
2025-02-14 2024-12-31 13F SOLENO THERAPEUTICS COM Put 190,800 531.79 8,576 462.73 n/a n/a n/a
2024-11-14 2024-09-30 13F SOLENO THERAPEUTICS COM Put 30,200 63.24 1,525 102.12 n/a n/a n/a
2024-08-14 2024-06-30 13F SOLENO THERAPEUTICS COM Put 18,500 88.78 755 79.95 n/a n/a n/a
2024-05-15 2024-03-31 13F SOLENO THERAPEUTICS COM Put 9,800 2,350.00 419 2,518.75 n/a n/a n/a
2024-02-14 2023-12-31 13F SOLENO THERAPEUTICS COM Put 400 16 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.