UniFirst Corporation
US ˙ NYSE ˙ US9047081040

SecurityUNF / UniFirst Corporation
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership11,239 shares
Latest Disclosed Value $ 2,827,620
Citadel Advisors Llc ownership in UNF / UniFirst Corporation

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 11,239 shares of UniFirst Corporation (US:UNF) valued at $2,827,620 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 13,949 shares of UniFirst Corporation. This represents a change in shares of -19.43% during the quarter. The current value of the position is $3,033,631 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (UNF) in the form of stock options. The firm currently holds call options representing 36,100 of underlying shares valued at $9,082,399 USD and put options representing 11,600 of underlying shares valued at $2,918,444 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.

UNF / UniFirst 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 UNIFIRST CORP MASS COM 904708104 11,239 -2,710 -19.43 2,828 5.09 0.0004
2026-02-17 2025-12-31 13F UNIFIRST CORP MASS COM 904708104 13,949 -12,098 -46.45 2,691 -38.22 0.0004
2025-11-14 2025-09-30 13F UNIFIRST CORP MASS COM 904708104 26,047 -7,526 -22.42 4,355 -31.10 0.0007
2025-08-14 2025-06-30 13F UNIFIRST CORP MASS COM 904708104 33,573 4,926 17.20 6,319 26.79 0.0011
2025-05-15 2025-03-31 13F UNIFIRST CORP MASS COM 904708104 28,647 23,125 418.78 4,985 427.97 0.0009
2025-02-14 2024-12-31 13F UNIFIRST CORP MASS COM 904708104 5,522 -15,670 -73.94 945 -77.57 0.0002
2024-11-14 2024-09-30 13F UNIFIRST CORP MASS COM 904708104 21,192 -82,942 -79.65 4,210 -76.44 0.0008
2024-08-14 2024-06-30 13F UNIFIRST CORP MASS COM 904708104 104,134 90,020 637.81 17,862 629.96 0.0036
2024-05-15 2024-03-31 13F UNIFIRST CORP MASS COM 904708104 14,114 4,007 39.65 2,448 32.41 0.0005
2024-02-14 2023-12-31 13F UNIFIRST CORP MASS COM 904708104 10,107 543 5.68 1,849 18.54 0.0004
2023-11-14 2023-09-30 13F UNIFIRST CORP MASS COM 904708104 9,564 7,552 375.35 1,559 401.29 0.0003
2023-08-14 2023-06-30 13F UNIFIRST CORP MASS COM 904708104 2,012 -685 -25.40 312 -34.53 0.0001
2023-05-15 2023-03-31 13F UNIFIRST CORP MASS COM 904708104 2,697 -10,087 -78.90 475 -80.75 0.0001
2023-02-14 2022-12-31 13F UNIFIRST CORP MASS COM 904708104 12,784 -13,870 -52.04 2,467 -44.98 0.0006
2022-11-14 2022-09-30 13F UNIFIRST CORP MASS COM 904708104 26,654 6,716 33.68 4,484 30.61 0.0010
2022-08-15 2022-06-30 13F UNIFIRST CORP MASS COM 904708104 19,938 12,142 155.75 3,433 139.07 0.0009
2022-05-16 2022-03-31 13F UNIFIRST CORP MASS COM 904708104 7,796 -40 -0.51 1,436 -12.86 0.0003
2022-02-14 2021-12-31 13F UNIFIRST CORP MASS COM 904708104 7,836 754 10.65 1,648 9.50 0.0003
2021-11-15 2021-09-30 13F UNIFIRST CORP MASS Cmn 904708104 7,082 1,974 38.65 1,505 25.52 0.0003
2021-08-16 2021-06-30 13F UNIFIRST CORP MASS COM 904708104 5,108 -26 -0.51 1,199 4.35 0.0003
2021-05-21 2021-03-31 13F/A-1 UNIFIRST CORP MASS COM 904708104 5,134 -6,077 -54.21 1,149 -51.60 0.0003
2021-05-17 2021-03-31 13F UNIFIRST CORP MASS COM 904708104 5,134 -6,077 1,149 0.0003
2021-02-16 2020-12-31 13F UNIFIRST CORP MASS COM 904708104 11,211 688 6.54 2,374 19.12 0.0006
2020-11-16 2020-09-30 13F UNIFIRST CORP MASS COM 904708104 10,523 -6,963 -39.82 1,993 -36.31 0.0006
2020-08-14 2020-06-30 13F UNIFIRST CORP MASS Cmn 904708104 17,486 5,785 49.44 3,129 76.98 0.0011
2020-05-15 2020-03-31 13F UNIFIRST CORP MASS Cmn 904708104 11,701 -29,963 -71.92 1,768 -78.99 0.0008
2020-02-14 2019-12-31 13F UNIFIRST CORP MASS Cmn 904708104 41,664 -45,650 -52.28 8,415 -50.61 0.0037
2019-11-14 2019-09-30 13F UNIFIRST CORP MASS Cmn 904708104 87,314 35,698 69.16 17,037 75.03 0.0080
2019-08-14 2019-06-30 13F UNIFIRST CORP MASS Cmn 904708104 51,616 -45,152 -46.66 9,734 -34.47 0.0045
2019-05-15 2019-03-31 13F UNIFIRST CORP MASS Cmn 904708104 96,768 96,768 14,854 0.0074
2019-02-14 2018-12-31 13F UNIFIRST CORP MASS Cmn 904708104 0 -19,525 -100.00 0 -100.00
2018-11-13 2018-09-30 13F UNIFIRST CORP MASS Cmn 904708104 19,525 15,766 419.42 3,390 409.77 0.0015
2018-08-14 2018-06-30 13F/A-1 UNIFIRST CORP MASS Cmn 904708104 3,759 -10,190 -73.05 665 -70.51 0.0003
2018-08-10 2018-06-30 13F UNIFIRST CORP MASS Cmn 904708104 3,759 -10,190 665
2018-05-14 2018-03-31 13F/A-1 UNIFIRST CORP MASS Cmn 904708104 13,949 3,675 35.77 2,255 33.12 0.0012
2018-05-11 2018-03-31 13F UNIFIRST CORP MASS Cmn 904708104 13,949 3,675 2,255
2018-02-09 2017-12-31 13F UNIFIRST CORP MASS Cmn 904708104 10,274 10,274 1,694 0.0010
2017-11-09 2017-09-30 13F UNIFIRST CORP MASS Cmn 904708104 0 -19,467 -100.00 0 -100.00
2017-08-11 2017-06-30 13F UNIFIRST CORP MASS Cmn 904708104 19,467 17,964 1,195.21 2,739 1,185.92 0.0023
2017-05-12 2017-03-31 13F UNIFIRST CORP MASS Cmn 904708104 1,503 1,503 213 0.0002
2017-01-31 2016-03-31 13F/A-1 UNIFIRST CORP CMN STK Cmn 904708104 0 -10,115 -100.00 0 -100.00
2017-01-31 2015-12-31 13F/A-1 UNIFIRST CORP MASS Cmn 904708104 10,115 10,115 0.00 1,054 0.0012
2016-02-12 2015-12-31 13F UNIFIRST CORP CMN STK Cmn 904708104 10,115 1,054
2014-11-14 2014-09-30 13F UNIFIRST CORP CMN STK Cmn 904708104 0 -2,491 -100.00 0 -100.00
2014-08-14 2014-06-30 13F UNIFIRST CORP CMN STK Cmn 904708104 2,491 -11,086 -81.65 264 -82.32 0.0004
2014-05-15 2014-03-31 13F UNIFIRST CORP CMN STK Cmn 904708104 13,577 1,944 16.71 1,493 20.02 0.0021
2014-02-14 2013-12-31 13F UNIFIRST CORP CMN STK Cmn 904708104 11,633 2,664 29.70 1,244 32.76 0.0016
2013-11-14 2013-09-30 13F UNIFIRST CORP CMN STK Cmn 904708104 8,969 -31,145 -77.64 937 -74.40 0.0014
2013-08-14 2013-06-30 13F UNIFIRST CORP CMN STK Cmn 904708104 40,114 40,114 3,660 0.0063
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 UNIFIRST CORP MASS COM Call 36,100 2,908.33 9,082 3,831.60 n/a n/a n/a
2026-02-17 2025-12-31 13F UNIFIRST CORP MASS COM Call 1,200 231 n/a n/a n/a
2025-08-14 2025-06-30 13F UNIFIRST CORP MASS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F UNIFIRST CORP MASS COM Call 4,200 366.67 731 377.12 n/a n/a n/a
2025-02-14 2024-12-31 13F UNIFIRST CORP MASS COM Call 900 -25.00 154 -35.71 n/a n/a n/a
2024-11-14 2024-09-30 13F UNIFIRST CORP MASS COM Call 1,200 -52.00 238 -44.39 n/a n/a n/a
2024-08-14 2024-06-30 13F UNIFIRST CORP MASS COM Call 2,500 -7.41 429 -8.55 n/a n/a n/a
2024-05-15 2024-03-31 13F UNIFIRST CORP MASS COM Call 2,700 468 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 UNIFIRST CORP MASS COM Put 11,600 -53.60 2,918 -39.49 n/a n/a n/a
2026-02-17 2025-12-31 13F UNIFIRST CORP MASS COM Put 25,000 941.67 4,822 1,102.49 n/a n/a n/a
2025-11-14 2025-09-30 13F UNIFIRST CORP MASS COM Put 2,400 -60.00 401 -64.48 n/a n/a n/a
2025-08-14 2025-06-30 13F UNIFIRST CORP MASS COM Put 6,000 -28.57 1,129 -22.72 n/a n/a n/a
2025-05-15 2025-03-31 13F UNIFIRST CORP MASS COM Put 8,400 4,100.00 1,462 4,197.06 n/a n/a n/a
2025-02-14 2024-12-31 13F UNIFIRST CORP MASS COM Put 200 -88.24 34 -89.91 n/a n/a n/a
2024-11-14 2024-09-30 13F UNIFIRST CORP MASS COM Put 1,700 70.00 338 97.08 n/a n/a n/a
2024-08-14 2024-06-30 13F UNIFIRST CORP MASS COM Put 1,000 -9.09 172 -10.00 n/a n/a n/a
2024-05-15 2024-03-31 13F UNIFIRST CORP MASS COM Put 1,100 191 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.