Sunrun Inc.
MX ˙ BMV ˙ US86771W1053
SecurityMX:RUN / Sunrun Inc.
InstitutionCss Llc/il
Latest Disclosed Ownership5,478 shares
Latest Disclosed Value $ 74,282
Css Llc/il ownership in RUN / Sunrun Inc.

On May 15, 2026 - Css Llc/il filed a 13F-HR form disclosing ownership of 5,478 shares of Sunrun Inc. (MX:RUN) valued at $74,282 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 6,478 shares of Sunrun Inc.. This represents a change in shares of -15.44% during the quarter.

Css Llc/il has a history of taking positions in derivatives of the underlying security (RUN) 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 59,600 of underlying shares valued at $808,176 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.

MX:RUN / Sunrun 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 SUNRUN COM 86771W105 5,478 -1,000 -15.44 74 -37.82 0.0036
2026-02-17 2025-12-31 13F SUNRUN COM 86771W105 6,478 301 4.87 119 12.26 0.0053
2025-11-13 2025-09-30 13F SUNRUN COM 86771W105 6,177 6,177 107 0.0048
2023-05-15 2023-03-31 13F SUNRUN COM 86771W105 0 -5,500 -100.00 0 -100.00
2023-02-14 2022-12-31 13F SUNRUN COM 86771W105 5,500 2,000 57.14 132 36.08 0.0075
2022-11-14 2022-09-30 13F SUNRUN COM 86771W105 3,500 3,500 97 0.0046
2022-08-15 2022-06-30 13F SUNRUN COM 86771W105 0 -6,860 -100.00 0 -100.00
2022-05-16 2022-03-31 13F SUNRUN COM 86771W105 6,860 -3,300 -32.48 208 -40.23 0.0075
2022-02-14 2021-12-31 13F SUNRUN COM 86771W105 10,160 0 0.00 348 -22.15 0.0124
2021-11-15 2021-09-30 13F SUNRUN COM 86771W105 10,160 -500 -4.69 447 -24.87 0.0190
2021-08-16 2021-06-30 13F SUNRUN COM 86771W105 10,660 7,360 223.03 595 197.50 0.0246
2021-05-17 2021-03-31 13F SUNRUN COM 86771W105 3,300 -2,044 -38.25 200 -46.09 0.0082
2021-02-16 2020-12-31 13F SUNRUN COM 86771W105 5,344 5,344 371 0.0142
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
(%)
2024-05-15 2024-03-31 13F SUNRUN COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-02-14 2023-12-31 13F SUNRUN COM Call 10,000 -16.67 196 30.67 n/a n/a n/a
2023-11-14 2023-09-30 13F SUNRUN COM Call 12,000 20.00 151 -15.73 n/a n/a n/a
2023-08-14 2023-06-30 13F SUNRUN COM Call 10,000 179 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 SUNRUN COM Put 59,600 -41.91 808 -57.18 n/a n/a n/a
2026-02-17 2025-12-31 13F SUNRUN COM Put 102,600 -27.75 1,888 -23.14 n/a n/a n/a
2025-11-13 2025-09-30 13F SUNRUN COM Put 142,000 8.81 2,455 130.08 n/a n/a n/a
2025-08-14 2025-06-30 13F SUNRUN COM Put 130,500 222.22 1,067 350.21 n/a n/a n/a
2025-05-15 2025-03-31 13F SUNRUN COM Put 40,500 -19.80 237 -49.25 n/a n/a n/a
2025-02-18 2024-12-31 13F SUNRUN COM Put 50,500 0.00 467 -48.79 n/a n/a n/a
2024-11-14 2024-09-30 13F SUNRUN COM Put 50,500 0.00 912 52.51 n/a n/a n/a
2024-08-14 2024-06-30 13F SUNRUN COM Put 50,500 76.57 599 59.04 n/a n/a n/a
2024-05-15 2024-03-31 13F SUNRUN COM Put 28,600 77.64 377 18.99 n/a n/a n/a
2024-02-14 2023-12-31 13F SUNRUN COM Put 16,100 103.80 316 219.19 n/a n/a n/a
2023-11-14 2023-09-30 13F SUNRUN COM Put 7,900 99 n/a n/a n/a
2023-05-15 2023-03-31 13F SUNRUN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-02-14 2022-12-31 13F SUNRUN COM Put 17,500 0.00 420 -13.04 n/a n/a n/a
2022-11-14 2022-09-30 13F SUNRUN COM Put 17,500 0.00 483 18.09 n/a n/a n/a
2022-08-15 2022-06-30 13F SUNRUN COM Put 17,500 0.00 409 -23.12 n/a n/a n/a
2022-05-16 2022-03-31 13F SUNRUN COM Put 17,500 0.00 532 -11.48 n/a n/a n/a
2022-02-14 2021-12-31 13F SUNRUN COM Put 17,500 0.00 601 -21.95 n/a n/a n/a
2021-11-15 2021-09-30 13F SUNRUN COM Put 17,500 0.00 770 -21.11 n/a n/a n/a
2021-08-16 2021-06-30 13F SUNRUN COM Put 17,500 976 n/a n/a n/a
2019-11-14 2019-09-30 13F SUNRUN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-08-14 2019-06-30 13F SUNRUN COM Put 300 6 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.