Unitil Corporation
US ˙ NYSE ˙ US9132591077

SecurityUTL / Unitil Corporation
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership120,967 shares
Latest Disclosed Value $ 6,319,316
Citadel Advisors Llc ownership in UTL / Unitil Corporation

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 120,967 shares of Unitil Corporation (US:UTL) valued at $6,319,316 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 42,360 shares of Unitil Corporation. This represents a change in shares of 185.57% during the quarter. The current value of the position is $6,197,139 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (UTL) in the form of stock options. The firm currently holds call options representing 8,100 of underlying shares valued at $423,144 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.

UTL / Unitil Corporation 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 UNITIL COM 913259107 120,967 78,607 185.57 6,319 208.09 0.0009
2026-02-17 2025-12-31 13F UNITIL COM 913259107 42,360 -22,598 -34.79 2,052 -34.01 0.0003
2025-11-14 2025-09-30 13F UNITIL COM 913259107 64,958 64,958 3,109 0.0005
2025-08-14 2025-06-30 13F UNITIL COM 913259107 0 -10,355 -100.00 0 -100.00
2025-05-15 2025-03-31 13F UNITIL COM 913259107 10,355 -9,614 -48.14 597 -44.82 0.0001
2025-02-14 2024-12-31 13F UNITIL COM 913259107 19,969 17,503 709.77 1,082 626.17 0.0002
2024-11-14 2024-09-30 13F UNITIL COM 913259107 2,466 888 56.27 149 83.95 0.0000
2024-08-14 2024-06-30 13F UNITIL COM 913259107 1,578 1,304 475.91 82 478.57 0.0000
2024-05-15 2024-03-31 13F UNITIL COM 913259107 274 274 14 0.0000
2024-02-14 2023-12-31 13F UNITIL COM 913259107 0 -2,525 -100.00 0 -100.00
2023-11-14 2023-09-30 13F UNITIL COM 913259107 2,525 -15,005 -85.60 108 -87.95 0.0000
2023-08-14 2023-06-30 13F UNITIL COM 913259107 17,530 -58,508 -76.95 889 -79.53 0.0002
2023-05-15 2023-03-31 13F UNITIL COM 913259107 76,038 31,873 72.17 4,337 91.23 0.0010
2023-02-14 2022-12-31 13F UNITIL COM 913259107 44,165 19,554 79.45 2,268 98.43 0.0005
2022-11-14 2022-09-30 13F UNITIL COM 913259107 24,611 24,611 1,143 0.0003
2022-08-15 2022-06-30 13F UNITIL COM 913259107 0 -34,450 -100.00 0 -100.00
2022-05-16 2022-03-31 13F UNITIL COM 913259107 34,450 21,169 159.39 1,719 181.80 0.0004
2022-02-14 2021-12-31 13F UNITIL COM 913259107 13,281 -12,213 -47.91 610 -44.09 0.0001
2021-11-15 2021-09-30 13F UNITIL Cmn 913259107 25,494 6,598 34.92 1,091 8.99 0.0002
2021-08-16 2021-06-30 13F UNITIL COM 913259107 18,896 -20,203 -51.67 1,001 -43.98 0.0002
2021-05-21 2021-03-31 13F/A-1 UNITIL COM 913259107 39,099 -9,239 -19.11 1,787 -16.50 0.0004
2021-05-17 2021-03-31 13F UNITIL COM 913259107 39,099 -9,239 1,787 0.0004
2021-02-16 2020-12-31 13F UNITIL COM 913259107 48,338 25,214 109.04 2,140 139.64 0.0006
2020-11-16 2020-09-30 13F UNITIL COM 913259107 23,124 -6,821 -22.78 893 -33.46 0.0003
2020-08-14 2020-06-30 13F UNITIL Cmn 913259107 29,945 -15,029 -33.42 1,342 -42.97 0.0005
2020-05-15 2020-03-31 13F UNITIL Cmn 913259107 44,974 2,502 5.89 2,353 -10.36 0.0011
2020-02-14 2019-12-31 13F UNITIL Cmn 913259107 42,472 20,002 89.02 2,625 84.21 0.0011
2019-11-14 2019-09-30 13F UNITIL Cmn 913259107 22,470 13,566 152.36 1,425 167.35 0.0007
2019-08-14 2019-06-30 13F UNITIL Cmn 913259107 8,904 3,821 75.17 533 93.12 0.0002
2019-05-15 2019-03-31 13F UNITIL Cmn 913259107 5,083 5,083 276 0.0001
2019-02-14 2018-12-31 13F UNITIL Cmn 913259107 0 -7,203 -100.00 0 -100.00
2018-11-13 2018-09-30 13F UNITIL Cmn 913259107 7,203 -39,216 -84.48 366 -84.56 0.0002
2018-08-14 2018-06-30 13F/A-1 UNITIL Cmn 913259107 46,419 6,112 15.16 2,370 26.67 0.0012
2018-08-10 2018-06-30 13F UNITIL Cmn 913259107 46,419 6,112 2,370
2018-05-14 2018-03-31 13F/A-1 UNITIL Cmn 913259107 40,307 18,390 83.91 1,871 87.10 0.0010
2018-05-11 2018-03-31 13F UNITIL Cmn 913259107 40,307 18,390 1,871
2018-02-09 2017-12-31 13F UNITIL Cmn 913259107 21,917 21,917 1,000 0.0006
2017-02-10 2016-12-31 13F UNITIL CORP CMN STK Cmn 913259107 0 -10,170 -100.00 0 -100.00
2017-01-31 2016-09-30 13F/A-1 UNITIL Cmn 913259107 10,170 10,170 0.00 397 0.0004
2016-11-10 2016-09-30 13F UNITIL CORP CMN STK Cmn 913259107 10,170 397
2017-01-31 2016-03-31 13F/A-1 UNITIL CORP CMN STK Cmn 913259107 0 -8,397 -100.00 0 -100.00
2017-01-31 2015-12-31 13F/A-1 UNITIL Cmn 913259107 8,397 -8,462 -50.19 301 -51.61 0.0003
2016-02-12 2015-12-31 13F UNITIL CORP CMN STK Cmn 913259107 8,397 301
2015-11-16 2015-09-30 13F UNITIL CORP CMN STK Cmn 913259107 16,859 16,859 0.00 622 0.0006
2014-11-14 2014-09-30 13F UNITIL CORP CMN STK Cmn 913259107 0 -19,945 -100.00 0 -100.00
2014-08-14 2014-06-30 13F UNITIL CORP CMN STK Cmn 913259107 19,945 8,991 82.08 675 113.61 0.0009
2013-08-14 2013-06-30 13F UNITIL CORP CMN STK Cmn 913259107 10,954 10,954 316 0.0005
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 UNITIL COM Call 8,100 -10.99 423 -3.86 n/a n/a n/a
2026-02-17 2025-12-31 13F UNITIL COM Call 9,100 24.66 441 26.07 n/a n/a n/a
2025-11-14 2025-09-30 13F UNITIL COM Call 7,300 349 n/a n/a n/a
2025-08-14 2025-06-30 13F UNITIL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F UNITIL COM Call 2,800 40.00 162 49.07 n/a n/a n/a
2025-02-14 2024-12-31 13F UNITIL COM Call 2,000 -82.91 108 -84.75 n/a n/a n/a
2024-11-14 2024-09-30 13F UNITIL COM Call 11,700 207.89 709 261.22 n/a n/a n/a
2024-08-14 2024-06-30 13F UNITIL COM Call 3,800 -25.49 197 -26.32 n/a n/a n/a
2024-05-15 2024-03-31 13F UNITIL COM Call 5,100 267 n/a n/a n/a
2024-02-14 2023-12-31 13F UNITIL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-14 2023-09-30 13F UNITIL COM Call 5,800 -1.69 248 -17.39 n/a n/a n/a
2023-08-14 2023-06-30 13F UNITIL COM Call 5,900 -15.71 299 -25.06 n/a n/a n/a
2023-05-15 2023-03-31 13F UNITIL COM Call 7,000 268.42 399 311.34 n/a n/a n/a
2023-02-14 2022-12-31 13F UNITIL COM Call 1,900 98 n/a n/a n/a
2022-08-15 2022-06-30 13F UNITIL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-05-16 2022-03-31 13F UNITIL COM Call 7,000 349 n/a n/a n/a
2019-11-14 2019-09-30 13F UNITIL Cmn Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-08-14 2019-06-30 13F UNITIL Cmn Call 10,000 599 n/a n/a n/a
2016-11-10 2016-09-30 13F UNITIL CORP CMN STK Cmn Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-01-31 2016-06-30 13F/A UNITIL Cmn Call 5,600 -51.72 239 -51.52 n/a n/a n/a
2016-08-12 2016-06-30 13F UNITIL CORP CMN STK Cmn Call 5,600 239 n/a n/a n/a
2017-01-31 2016-03-31 13F/A UNITIL Cmn Call 11,600 11,500.00 493 12,225.00 n/a n/a n/a
2016-05-13 2016-03-31 13F UNITIL CORP CMN STK Cmn Call 11,600 493 n/a n/a n/a
2017-01-31 2015-12-31 13F/A UNITIL Cmn Call 100 4 n/a n/a n/a
2016-02-12 2015-12-31 13F UNITIL CORP CMN STK Cmn Call 100 4 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 UNITIL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-17 2025-12-31 13F UNITIL COM Put 4,700 228 n/a n/a n/a
2025-08-14 2025-06-30 13F UNITIL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F UNITIL COM Put 300 -90.32 17 -89.82 n/a n/a n/a
2025-02-14 2024-12-31 13F UNITIL COM Put 3,100 6.90 168 -4.57 n/a n/a n/a
2024-11-14 2024-09-30 13F UNITIL COM Put 2,900 190.00 176 243.14 n/a n/a n/a
2024-08-14 2024-06-30 13F UNITIL COM Put 1,000 -9.09 52 -10.53 n/a n/a n/a
2024-05-15 2024-03-31 13F UNITIL COM Put 1,100 58 n/a n/a n/a
2024-02-14 2023-12-31 13F UNITIL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-14 2023-09-30 13F UNITIL COM Put 1,600 68 n/a n/a n/a
2023-05-15 2023-03-31 13F UNITIL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-02-14 2022-12-31 13F UNITIL COM Put 900 46 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.