FuelCell Energy, Inc.
BG ˙ BUL ˙ US35952H6018
SecurityBG:FEY / FuelCell Energy, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership112,626 shares
Latest Disclosed Value $ 735,448
Citigroup Inc ownership in FEY / FuelCell Energy, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 112,626 shares of FuelCell Energy, Inc. (BG:FEY) valued at $735,448 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 10,912 shares of FuelCell Energy, Inc.. This represents a change in shares of 932.13% during the quarter.

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

BG:FEY / FuelCell Energy, 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 FUELCELL ENERGY COM NEW 35952H700 112,626 101,714 932.13 735 830.38 0.0002
2026-02-13 2025-12-31 13F FUELCELL ENERGY COM NEW 35952H700 10,912 5,363 96.65 80 83.72 0.0000
2025-11-10 2025-09-30 13F FUELCELL ENERGY COM NEW 35952H700 5,549 -8,167 -59.54 43 -43.42 0.0000
2025-08-11 2025-06-30 13F FUELCELL ENERGY COM NEW 35952H700 13,716 -2,397 -14.88 77 4.11 0.0000
2025-05-12 2025-03-31 13F FUELCELL ENERGY COM NEW 35952H700 16,113 -2,084 -11.45 74 -55.49 0.0000
2025-02-12 2024-12-31 13F FUELCELL ENERGY COM NEW 35952H700 18,197 -20,734 -53.26 165 1,722.22 0.0001
2019-05-13 2019-03-31 13F FUELCELL ENERGY COM NEW 35952H502 38,931 -40,670 -51.09 9 -79.55 0.0000
2019-02-12 2018-12-31 13F FUELCELL ENERGY COM NEW 35952H502 79,601 -7,564 -8.68 44 -52.69 0.0000
2018-11-13 2018-09-30 13F FUELCELL ENERGY COM NEW 35952H502 87,165 70,842 434.00 93 322.73 0.0001
2018-08-10 2018-06-30 13F FUELCELL ENERGY COM NEW 35952H502 16,323 16,323 -81.27 22 -76.34 0.0000
2018-05-11 2018-03-31 13F FUELCELL ENERGY COM NEW 35952H502 0 -100 -100.00 0 -100.00 0.0000
2018-02-12 2017-12-31 13F FUELCELL ENERGY COM NEW 35952H502 100 100 0 0.0000
2017-11-13 2017-09-30 13F FUELCELL ENERGY COM NEW 35952H502 0 -155,860 -100.00 0 -100.00
2017-08-11 2017-06-30 13F FUELCELL ENERGY COM NEW 35952H502 155,860 31,650 25.48 193 12.87 0.0002
2017-05-12 2017-03-31 13F FUELCELL ENERGY COM NEW 35952H502 124,210 -53,074 -29.94 171 -45.02 0.0002
2017-02-10 2016-12-31 13F FUELCELL ENERGY COM NEW 35952H502 177,284 148,818 522.79 311 100.65 0.0003
2016-11-10 2016-09-30 13F FUELCELL ENERGY COM NEW 35952H502 28,466 20,613 262.49 155 222.92 0.0001
2016-08-12 2016-06-30 13F FUELCELL ENERGY COM NEW 35952H502 7,853 -9,384 -54.44 48 -58.62 0.0000
2016-05-13 2016-03-31 13F FUELCELL ENERGY COM NEW 35952H502 17,237 -1,534 -8.17 116 26.09 0.0001
2016-02-12 2015-12-31 13F FUELCELL ENERGY COM NEW 35952H502 18,771 18,771 92 0.0001
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
(%)
2019-08-12 2019-06-30 13F FUELCELL ENERGY COM NEW Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-05-13 2019-03-31 13F FUELCELL ENERGY COM NEW Call 37,600 -30.11 9 -70.00 n/a n/a n/a
2019-02-12 2018-12-31 13F FUELCELL ENERGY COM NEW Call 53,800 -26.80 30 -62.03 n/a n/a n/a
2018-11-13 2018-09-30 13F FUELCELL ENERGY COM NEW Call 73,500 -58.17 79 -65.95 n/a n/a n/a
2018-08-10 2018-06-30 13F FUELCELL ENERGY COM NEW Call 175,700 4.90 232 -20.00 n/a n/a n/a
2018-05-11 2018-03-31 13F FUELCELL ENERGY COM NEW Call 167,500 -39.77 290 -38.69 n/a n/a n/a
2018-02-12 2017-12-31 13F FUELCELL ENERGY COM NEW Call 278,100 331.83 473 318.58 n/a n/a n/a
2017-11-13 2017-09-30 13F FUELCELL ENERGY COM NEW Call 64,400 223.62 113 352.00 n/a n/a n/a
2017-08-11 2017-06-30 13F FUELCELL ENERGY COM NEW Call 19,900 103.06 25 92.31 n/a n/a n/a
2017-05-12 2017-03-31 13F FUELCELL ENERGY COM NEW Call 9,800 -96.47 13 -97.33 n/a n/a n/a
2017-02-10 2016-12-31 13F FUELCELL ENERGY COM NEW Call 277,744 -39.90 486 -80.60 n/a n/a n/a
2016-11-10 2016-09-30 13F FUELCELL ENERGY COM NEW Call 462,140 564.57 2,505 478.52 n/a n/a n/a
2016-08-12 2016-06-30 13F FUELCELL ENERGY COM NEW Call 69,540 -41.74 433 -46.41 n/a n/a n/a
2016-05-13 2016-03-31 13F FUELCELL ENERGY COM NEW Call 119,356 261.77 808 392.68 n/a n/a n/a
2016-02-12 2015-12-31 13F FUELCELL ENERGY COM NEW Call 32,992 164 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
(%)
2019-08-12 2019-06-30 13F FUELCELL ENERGY COM NEW Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-05-13 2019-03-31 13F FUELCELL ENERGY COM NEW Put 8,700 -87.57 2 -94.87 n/a n/a n/a
2019-02-12 2018-12-31 13F FUELCELL ENERGY COM NEW Put 70,000 -23.25 39 -60.20 n/a n/a n/a
2018-11-13 2018-09-30 13F FUELCELL ENERGY COM NEW Put 91,200 7.29 98 -12.50 n/a n/a n/a
2018-08-10 2018-06-30 13F FUELCELL ENERGY COM NEW Put 85,000 -4.92 112 -27.74 n/a n/a n/a
2018-05-11 2018-03-31 13F FUELCELL ENERGY COM NEW Put 89,400 -8.12 155 -6.06 n/a n/a n/a
2018-02-12 2017-12-31 13F FUELCELL ENERGY COM NEW Put 97,300 257.72 165 243.75 n/a n/a n/a
2017-11-13 2017-09-30 13F FUELCELL ENERGY COM NEW Put 27,200 -76.24 48 -66.20 n/a n/a n/a
2017-08-11 2017-06-30 13F FUELCELL ENERGY COM NEW Put 114,500 -0.61 142 -10.13 n/a n/a n/a
2017-05-12 2017-03-31 13F FUELCELL ENERGY COM NEW Put 115,200 -22.37 158 -39.23 n/a n/a n/a
2017-02-10 2016-12-31 13F FUELCELL ENERGY COM NEW Put 148,400 224.27 260 4.84 n/a n/a n/a
2016-11-10 2016-09-30 13F FUELCELL ENERGY COM NEW Put 45,764 4.57 248 -8.82 n/a n/a n/a
2016-08-12 2016-06-30 13F FUELCELL ENERGY COM NEW Put 43,764 53.58 272 40.93 n/a n/a n/a
2016-05-13 2016-03-31 13F FUELCELL ENERGY COM NEW Put 28,496 9.16 193 49.61 n/a n/a n/a
2016-02-12 2015-12-31 13F FUELCELL ENERGY COM NEW Put 26,104 129 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.