Kelly Services, Inc.
US ˙ NasdaqGS ˙ US4881522084

SecurityKELYA / Kelly Services, Inc.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership59,538 shares
Latest Disclosed Value $ 526,912
Citadel Advisors Llc ownership in KELYA / Kelly Services, Inc.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 59,538 shares of Kelly Services, Inc. (US:KELYA) valued at $526,911 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 173,350 shares of Kelly Services, Inc.. This represents a change in shares of -65.65% during the quarter. The current value of the position is $700,762 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (KELYA) 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 16,100 of underlying shares valued at $142,485 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.

KELYA / Kelly Services, 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 KELLY SVCS CL A 488152208 59,538 -113,812 -65.65 527 -65.51 0.0001
2026-02-17 2025-12-31 13F KELLY SVCS CL A 488152208 173,350 18,470 11.93 1,525 -24.95 0.0002
2025-11-14 2025-09-30 13F KELLY SVCS CL A 488152208 154,880 -335,871 -68.44 2,032 -64.64 0.0003
2025-08-14 2025-06-30 13F KELLY SVCS CL A 488152208 490,751 -170,522 -25.79 5,747 -34.01 0.0010
2025-05-15 2025-03-31 13F KELLY SVCS CL A 488152208 661,273 -75,089 -10.20 8,709 -15.16 0.0017
2025-02-14 2024-12-31 13F KELLY SVCS CL A 488152208 736,362 670,636 1,020.35 10,265 629.50 0.0018
2024-11-14 2024-09-30 13F KELLY SVCS CL A 488152208 65,726 -848 -1.27 1,407 -1.26 0.0003
2024-08-14 2024-06-30 13F KELLY SVCS CL A 488152208 66,574 28,322 74.04 1,425 48.90 0.0003
2024-05-15 2024-03-31 13F KELLY SVCS CL A 488152208 38,252 -46,748 -55.00 958 -47.90 0.0002
2024-02-14 2023-12-31 13F KELLY SVCS CL A 488152208 85,000 307 0.36 1,838 19.29 0.0004
2023-11-14 2023-09-30 13F KELLY SVCS CL A 488152208 84,693 -33,210 -28.17 1,541 -25.82 0.0003
2023-08-14 2023-06-30 13F KELLY SVCS CL A 488152208 117,903 65,313 124.19 2,076 138.07 0.0004
2023-05-15 2023-03-31 13F KELLY SVCS CL A 488152208 52,590 -59,317 -53.01 872 -53.89 0.0002
2023-02-14 2022-12-31 13F KELLY SVCS CL A 488152208 111,907 -163,391 -59.35 1,891 -49.45 0.0004
2022-11-14 2022-09-30 13F KELLY SVCS CL A 488152208 275,298 45,892 20.00 3,741 -17.78 0.0009
2022-08-15 2022-06-30 13F KELLY SVCS CL A 488152208 229,406 168,267 275.22 4,550 243.14 0.0012
2022-05-16 2022-03-31 13F KELLY SVCS CL A 488152208 61,139 -67,245 -52.38 1,326 -38.41 0.0003
2022-02-14 2021-12-31 13F KELLY SVCS CL A 488152208 128,384 76,101 145.56 2,153 118.14 0.0004
2021-11-15 2021-09-30 13F KELLY SVCS Cmn 488152208 52,283 25,946 98.52 987 56.42 0.0002
2021-08-16 2021-06-30 13F KELLY SVCS CL A 488152208 26,337 -31,260 -54.27 631 -50.82 0.0001
2021-05-21 2021-03-31 13F/A-1 KELLY SVCS CL A 488152208 57,597 57,597 1,283 0.0003
2021-05-17 2021-03-31 13F KELLY SVCS CL A 488152208 57,597 57,597 1,283 0.0003
2020-11-16 2020-09-30 13F KELLY SVCS Cmn 488152208 0 -91,957 -100.00 0 -100.00
2020-08-14 2020-06-30 13F KELLY SVCS Cmn 488152208 91,957 -23,914 -20.64 1,454 -1.09 0.0005
2020-05-15 2020-03-31 13F KELLY SVCS Cmn 488152208 115,871 105,016 967.44 1,470 497.56 0.0007
2020-02-14 2019-12-31 13F KELLY SVCS Cmn 488152208 10,855 -3,863 -26.25 246 -30.90 0.0001
2019-11-14 2019-09-30 13F KELLY SVCS Cmn 488152208 14,718 -34,723 -70.23 356 -72.51 0.0002
2019-08-14 2019-06-30 13F KELLY SVCS Cmn 488152208 49,441 23,598 91.31 1,295 127.19 0.0006
2019-05-15 2019-03-31 13F KELLY SVCS Cmn 488152208 25,843 25,843 570 0.0003
2019-02-14 2018-12-31 13F KELLY SVCS Cmn 488152208 0 -25,747 -100.00 0 -100.00
2018-11-13 2018-09-30 13F KELLY SVCS Cmn 488152208 25,747 -43,746 -62.95 619 -60.32 0.0003
2018-08-14 2018-06-30 13F/A-1 KELLY SVCS Cmn 488152208 69,493 57,844 496.56 1,560 361.54 0.0008
2018-08-10 2018-06-30 13F KELLY SVCS Cmn 488152208 69,493 57,844 1,560
2018-05-14 2018-03-31 13F/A-1 KELLY SVCS Cmn 488152208 11,649 -9,953 -46.07 338 -42.61 0.0002
2018-05-11 2018-03-31 13F KELLY SVCS Cmn 488152208 11,649 -9,953 338
2018-02-09 2017-12-31 13F KELLY SVCS Cmn 488152208 21,602 -34,214 -61.30 589 -57.96 0.0004
2017-11-09 2017-09-30 13F KELLY SVCS Cmn 488152208 55,816 29,362 110.99 1,401 135.86 0.0011
2017-08-11 2017-06-30 13F KELLY SVCS Cmn 488152208 26,454 9,205 53.37 594 57.56 0.0005
2017-05-12 2017-03-31 13F KELLY SVCS Cmn 488152208 17,249 -20,185 -53.92 377 -56.06 0.0003
2017-02-10 2016-12-31 13F KELLY SVCS Cmn 488152208 37,434 -37,597 -50.11 858 -40.54 0.0009
2017-01-31 2016-09-30 13F/A-1 KELLY SVCS Cmn 488152208 75,031 75,031 0.00 1,443 0.0014
2016-11-10 2016-09-30 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 75,031 1,443
2016-05-13 2016-03-31 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 0 -7,105 -100.00 0 -100.00
2017-01-31 2015-12-31 13F/A-1 KELLY SVCS Cmn 488152208 7,105 3,730 110.52 115 139.58 0.0001
2016-02-12 2015-12-31 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 7,105 115
2015-11-16 2015-09-30 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 3,375 483 16.70 48 9.09 0.0000
2015-08-14 2015-06-30 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 2,892 -1,954 -40.32 44 -48.24 0.0000
2015-05-15 2015-03-31 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 4,846 -12,258 -71.67 85 -70.79 0.0001
2015-02-17 2014-12-31 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 17,104 17,104 0.00 291 0.0004
2014-11-14 2014-09-30 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 0 -25,129 -100.00 0 -100.00
2014-08-14 2014-06-30 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 25,129 12,063 92.32 432 39.35 0.0006
2014-05-15 2014-03-31 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 13,066 -14,944 -53.35 310 -55.59 0.0004
2014-02-14 2013-12-31 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 28,010 3,070 12.31 698 43.62 0.0009
2013-11-14 2013-09-30 13F KELLY SERVICES INC -CL A CMN STK Cmn 488152208 24,940 24,940 486 0.0007
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
(%)
2026-02-17 2025-12-31 13F KELLY SVCS CL A Call 0 -100.00 0 n/a n/a n/a
2025-11-14 2025-09-30 13F KELLY SVCS CL A Call 12,700 167 n/a n/a n/a
2025-08-14 2025-06-30 13F KELLY SVCS CL A Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F KELLY SVCS CL A Call 500 -61.54 7 -66.67 n/a n/a n/a
2025-02-14 2024-12-31 13F KELLY SVCS CL A Call 1,300 -86.46 18 -91.22 n/a n/a n/a
2024-11-14 2024-09-30 13F KELLY SVCS CL A Call 9,600 -54.93 206 -55.04 n/a n/a n/a
2024-08-14 2024-06-30 13F KELLY SVCS CL A Call 21,300 -32.81 456 -42.50 n/a n/a n/a
2024-05-15 2024-03-31 13F KELLY SVCS CL A Call 31,700 55.39 794 79.82 n/a n/a n/a
2024-02-14 2023-12-31 13F KELLY SVCS CL A Call 20,400 325.00 441 406.90 n/a n/a n/a
2023-11-14 2023-09-30 13F KELLY SVCS CL A Call 4,800 336.36 87 357.89 n/a n/a n/a
2023-08-14 2023-06-30 13F KELLY SVCS CL A Call 1,100 -60.71 19 -58.70 n/a n/a n/a
2023-05-15 2023-03-31 13F KELLY SVCS CL A Call 2,800 27.27 46 24.32 n/a n/a n/a
2023-02-14 2022-12-31 13F KELLY SVCS CL A Call 2,200 37 n/a n/a n/a
2022-05-16 2022-03-31 13F KELLY SVCS CL A Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-14 2021-12-31 13F KELLY SVCS CL A Call 11,000 -81.16 184 -83.32 n/a n/a n/a
2021-11-15 2021-09-30 13F KELLY SVCS Cmn Call 58,400 349.23 1,103 253.53 n/a n/a n/a
2021-08-16 2021-06-30 13F KELLY SVCS CL A Call 13,000 -9.72 312 -2.80 n/a n/a n/a
2021-05-21 2021-03-31 13F/A KELLY SVCS CL A Call 14,400 1.41 321 9.93 n/a n/a n/a
2021-05-17 2021-03-31 13F KELLY SVCS CL A Call 14,400 321 n/a n/a n/a
2021-02-16 2020-12-31 13F KELLY SVCS CL A Call 14,200 292 n/a n/a n/a
2020-02-14 2019-12-31 13F KELLY SVCS Cmn Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-11-14 2019-09-30 13F KELLY SVCS Cmn Call 8,400 203 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 KELLY SVCS CL A Put 16,100 142 n/a n/a n/a
2025-08-14 2025-06-30 13F KELLY SVCS CL A Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F KELLY SVCS CL A Put 2,400 14.29 32 6.90 n/a n/a n/a
2025-02-14 2024-12-31 13F KELLY SVCS CL A Put 2,100 950.00 29 625.00 n/a n/a n/a
2024-11-14 2024-09-30 13F KELLY SVCS CL A Put 200 100.00 4 100.00 n/a n/a n/a
2024-08-14 2024-06-30 13F KELLY SVCS CL A Put 100 0.00 2 0.00 n/a n/a n/a
2024-05-15 2024-03-31 13F KELLY SVCS CL A Put 100 3 n/a n/a n/a
2024-02-14 2023-12-31 13F KELLY SVCS CL A Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-14 2023-09-30 13F KELLY SVCS CL A Put 100 -96.55 2 -98.04 n/a n/a n/a
2023-08-14 2023-06-30 13F KELLY SVCS CL A Put 2,900 0.00 51 6.25 n/a n/a n/a
2023-05-15 2023-03-31 13F KELLY SVCS CL A Put 2,900 -23.68 48 -25.00 n/a n/a n/a
2023-02-14 2022-12-31 13F KELLY SVCS CL A Put 3,800 64 n/a n/a n/a
2022-11-14 2022-09-30 13F KELLY SVCS CL A Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-15 2022-06-30 13F KELLY SVCS CL A Put 19,000 6.74 377 -2.33 n/a n/a n/a
2022-05-16 2022-03-31 13F KELLY SVCS CL A Put 17,800 -39.04 386 -21.22 n/a n/a n/a
2022-02-14 2021-12-31 13F KELLY SVCS CL A Put 29,200 -6.71 490 -17.09 n/a n/a n/a
2021-11-15 2021-09-30 13F KELLY SVCS Cmn Put 31,300 591 n/a n/a n/a
2020-11-16 2020-09-30 13F KELLY SVCS Cmn Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-08-14 2020-06-30 13F KELLY SVCS Cmn Put 10,300 163 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.