AdvanSix Inc.
MX ˙ BMV ˙ US00773T1016
SecurityMX:ASIX / AdvanSix Inc.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership221,864 shares
Latest Disclosed Value $ 5,413,482
Citadel Advisors Llc ownership in ASIX / AdvanSix Inc.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 221,864 shares of AdvanSix Inc. (MX:ASIX) valued at $5,413,482 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 39,265 shares of AdvanSix Inc.. This represents a change in shares of 465.04% during the quarter.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (ASIX) in the form of stock options. The firm currently holds call options representing 36,500 of underlying shares valued at $890,600 USD and put options representing 14,700 of underlying shares valued at $358,680 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:ASIX / AdvanSix 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 ADVANSIX COM 00773T101 221,864 182,599 465.04 5,413 697.20 0.0008
2026-02-17 2025-12-31 13F ADVANSIX COM 00773T101 39,265 39,265 679 0.0001
2025-08-14 2025-06-30 13F ADVANSIX COM 00773T101 0 -28,368 -100.00 0 -100.00
2025-05-15 2025-03-31 13F ADVANSIX COM 00773T101 28,368 9,198 47.98 643 17.58 0.0001
2025-02-14 2024-12-31 13F ADVANSIX COM 00773T101 19,170 -93,592 -83.00 546 -84.06 0.0001
2024-11-14 2024-09-30 13F ADVANSIX COM 00773T101 112,762 -31,442 -21.80 3,426 3.63 0.0007
2024-08-14 2024-06-30 13F ADVANSIX COM 00773T101 144,204 15,633 12.16 3,305 -10.12 0.0007
2024-05-15 2024-03-31 13F ADVANSIX COM 00773T101 128,571 10,098 8.52 3,677 3.61 0.0007
2024-02-14 2023-12-31 13F ADVANSIX COM 00773T101 118,473 7,807 7.05 3,549 3.20 0.0007
2023-11-14 2023-09-30 13F ADVANSIX COM 00773T101 110,666 61,083 123.19 3,440 98.33 0.0007
2023-08-14 2023-06-30 13F ADVANSIX COM 00773T101 49,583 -109,147 -68.76 1,734 -71.45 0.0004
2023-05-15 2023-03-31 13F ADVANSIX COM 00773T101 158,730 95,467 150.90 6,075 152.56 0.0013
2023-02-14 2022-12-31 13F ADVANSIX COM 00773T101 63,263 -19,630 -23.68 2,405 -9.62 0.0006
2022-11-14 2022-09-30 13F ADVANSIX COM 00773T101 82,893 14,261 20.78 2,661 15.95 0.0006
2022-08-15 2022-06-30 13F ADVANSIX COM 00773T101 68,632 -121,712 -63.94 2,295 -76.40 0.0006
2022-05-16 2022-03-31 13F ADVANSIX COM 00773T101 190,344 102,064 115.61 9,724 133.13 0.0020
2022-02-14 2021-12-31 13F ADVANSIX COM 00773T101 88,280 60,862 221.98 4,171 282.66 0.0009
2021-11-15 2021-09-30 13F ADVANSIX Cmn 00773T101 27,418 13,360 95.03 1,090 159.52 0.0002
2021-08-16 2021-06-30 13F ADVANSIX COM 00773T101 14,058 -86,131 -85.97 420 -84.37 0.0001
2021-05-21 2021-03-31 13F/A-1 ADVANSIX COM 00773T101 100,189 10,334 11.50 2,687 49.61 0.0007
2021-05-17 2021-03-31 13F ADVANSIX COM 00773T101 100,189 10,334 2,687 0.0007
2021-02-16 2020-12-31 13F ADVANSIX COM 00773T101 89,855 55,857 164.29 1,796 310.05 0.0005
2020-11-16 2020-09-30 13F ADVANSIX COM 00773T101 33,998 -11,100 -24.61 438 -17.36 0.0001
2020-08-14 2020-06-30 13F ADVANSIX Cmn 00773T101 45,098 45,098 530 0.0002
2019-05-15 2019-03-31 13F ADVANSIX Cmn 00773T101 0 -42,231 -100.00 0 -100.00
2019-02-14 2018-12-31 13F ADVANSIX Cmn 00773T101 42,231 -33,720 -44.40 1,028 -60.12 0.0006
2018-11-13 2018-09-30 13F ADVANSIX Cmn 00773T101 75,951 2,836 3.88 2,578 -3.70 0.0012
2018-08-14 2018-06-30 13F/A-1 ADVANSIX Cmn 00773T101 73,115 -25,831 -26.11 2,677 -22.23 0.0013
2018-08-10 2018-06-30 13F ADVANSIX Cmn 00773T101 73,115 -25,831 2,677
2018-05-14 2018-03-31 13F/A-1 ADVANSIX Cmn 00773T101 98,946 23,336 30.86 3,442 8.20 0.0019
2018-05-11 2018-03-31 13F ADVANSIX Cmn 00773T101 98,946 23,336 3,442
2018-02-09 2017-12-31 13F ADVANSIX Cmn 00773T101 75,610 75,610 3,181 0.0019
2017-11-09 2017-09-30 13F ADVANSIX Cmn 00773T101 0 -9,423 -100.00 0 -100.00
2017-08-11 2017-06-30 13F ADVANSIX Cmn 00773T101 9,423 9,423 294 0.0002
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 ADVANSIX COM Call 36,500 -52.16 891 -32.52 n/a n/a n/a
2026-02-17 2025-12-31 13F ADVANSIX COM Call 76,300 422.60 1,320 367.73 n/a n/a n/a
2025-11-14 2025-09-30 13F ADVANSIX COM Call 14,600 283 n/a n/a n/a
2025-08-14 2025-06-30 13F ADVANSIX COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F ADVANSIX COM Call 19,700 -7.94 446 -26.77 n/a n/a n/a
2025-02-14 2024-12-31 13F ADVANSIX COM Call 21,400 16.30 610 9.14 n/a n/a n/a
2024-11-14 2024-09-30 13F ADVANSIX COM Call 18,400 384.21 559 541.38 n/a n/a n/a
2024-08-14 2024-06-30 13F ADVANSIX COM Call 3,800 -60.82 87 -68.59 n/a n/a n/a
2024-05-15 2024-03-31 13F ADVANSIX COM Call 9,700 24.36 277 18.88 n/a n/a n/a
2024-02-14 2023-12-31 13F ADVANSIX COM Call 7,800 4.00 234 0.00 n/a n/a n/a
2023-11-14 2023-09-30 13F ADVANSIX COM Call 7,500 -32.43 233 -39.95 n/a n/a n/a
2023-08-14 2023-06-30 13F ADVANSIX COM Call 11,100 12.12 388 2.65 n/a n/a n/a
2023-05-15 2023-03-31 13F ADVANSIX COM Call 9,900 50.00 379 51.20 n/a n/a n/a
2023-02-14 2022-12-31 13F ADVANSIX COM Call 6,600 251 n/a n/a n/a
2022-11-14 2022-09-30 13F ADVANSIX COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-15 2022-06-30 13F ADVANSIX COM Call 11,000 -70.11 368 -80.43 n/a n/a n/a
2022-05-16 2022-03-31 13F ADVANSIX COM Call 36,800 -14.42 1,880 -7.48 n/a n/a n/a
2022-02-14 2021-12-31 13F ADVANSIX COM Call 43,000 42.86 2,032 69.90 n/a n/a n/a
2021-11-15 2021-09-30 13F ADVANSIX Cmn Call 30,100 11.07 1,196 47.84 n/a n/a n/a
2021-08-16 2021-06-30 13F ADVANSIX COM Call 27,100 92.20 809 114.02 n/a n/a n/a
2021-05-21 2021-03-31 13F/A ADVANSIX COM Call 14,100 27.03 378 70.27 n/a n/a n/a
2021-05-17 2021-03-31 13F ADVANSIX COM Call 14,100 378 n/a n/a n/a
2021-02-16 2020-12-31 13F ADVANSIX COM Call 11,100 222 n/a n/a n/a
2020-11-16 2020-09-30 13F ADVANSIX Cmn Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-08-14 2020-06-30 13F ADVANSIX Cmn Call 20,000 21.21 235 49.68 n/a n/a n/a
2020-05-15 2020-03-31 13F ADVANSIX Cmn Call 16,500 157 n/a n/a n/a
2019-02-14 2018-12-31 13F ADVANSIX Cmn Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-11-13 2018-09-30 13F ADVANSIX Cmn Call 6,500 221 n/a n/a n/a
2018-08-14 2018-06-30 13F/A ADVANSIX Cmn Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-05-14 2018-03-31 13F/A ADVANSIX Cmn Call 9,500 330 n/a n/a n/a
2018-05-11 2018-03-31 13F ADVANSIX Cmn Call 9,500 330 n/a n/a n/a
2018-02-09 2017-12-31 13F ADVANSIX Cmn Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-11-09 2017-09-30 13F ADVANSIX Cmn Call 5,600 -24.32 223 -3.46 n/a n/a n/a
2017-08-11 2017-06-30 13F ADVANSIX Cmn Call 7,400 231 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 ADVANSIX COM Put 14,700 9.70 359 54.98 n/a n/a n/a
2026-02-17 2025-12-31 13F ADVANSIX COM Put 13,400 -52.14 232 -57.38 n/a n/a n/a
2025-11-14 2025-09-30 13F ADVANSIX COM Put 28,000 543 n/a n/a n/a
2025-08-14 2025-06-30 13F ADVANSIX COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F ADVANSIX COM Put 8,000 6.67 181 -15.02 n/a n/a n/a
2025-02-14 2024-12-31 13F ADVANSIX COM Put 7,500 -35.90 214 -40.00 n/a n/a n/a
2024-11-14 2024-09-30 13F ADVANSIX COM Put 11,700 200.00 355 298.88 n/a n/a n/a
2024-08-14 2024-06-30 13F ADVANSIX COM Put 3,900 -87.17 89 -89.76 n/a n/a n/a
2024-05-15 2024-03-31 13F ADVANSIX COM Put 30,400 94.87 869 86.08 n/a n/a n/a
2024-02-14 2023-12-31 13F ADVANSIX COM Put 15,600 132.84 467 124.52 n/a n/a n/a
2023-11-14 2023-09-30 13F ADVANSIX COM Put 6,700 71.79 208 52.94 n/a n/a n/a
2023-08-14 2023-06-30 13F ADVANSIX COM Put 3,900 -22.00 136 -28.80 n/a n/a n/a
2023-05-15 2023-03-31 13F ADVANSIX COM Put 5,000 163.16 191 165.28 n/a n/a n/a
2023-02-14 2022-12-31 13F ADVANSIX COM Put 1,900 72 n/a n/a n/a
2022-11-14 2022-09-30 13F ADVANSIX COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-15 2022-06-30 13F ADVANSIX COM Put 8,400 -95.21 281 -96.86 n/a n/a n/a
2022-05-16 2022-03-31 13F ADVANSIX COM Put 175,200 573.85 8,951 628.32 n/a n/a n/a
2022-02-14 2021-12-31 13F ADVANSIX COM Put 26,000 44.44 1,229 71.65 n/a n/a n/a
2021-11-15 2021-09-30 13F ADVANSIX Cmn Put 18,000 -25.00 716 -0.14 n/a n/a n/a
2021-08-16 2021-06-30 13F ADVANSIX COM Put 24,000 105.13 717 128.34 n/a n/a n/a
2021-05-21 2021-03-31 13F/A ADVANSIX COM Put 11,700 314 n/a n/a n/a
2021-05-17 2021-03-31 13F ADVANSIX COM Put 11,700 314 n/a n/a n/a
2021-02-16 2020-12-31 13F ADVANSIX COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-11-16 2020-09-30 13F ADVANSIX COM Put 31,500 -24.10 406 -16.63 n/a n/a n/a
2020-08-14 2020-06-30 13F ADVANSIX Cmn Put 41,500 487 n/a n/a n/a
2019-08-14 2019-06-30 13F ADVANSIX Cmn Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-05-15 2019-03-31 13F ADVANSIX Cmn Put 10,800 309 n/a n/a n/a
2019-02-14 2018-12-31 13F ADVANSIX Cmn Put 0 -100.00 0 -100.00 n/a n/a n/a
2018-11-13 2018-09-30 13F ADVANSIX Cmn Put 7,700 -15.38 261 -21.62 n/a n/a n/a
2018-08-14 2018-06-30 13F/A ADVANSIX Cmn Put 9,100 -26.02 333 -22.20 n/a n/a n/a
2018-08-10 2018-06-30 13F ADVANSIX Cmn Put 9,100 333 n/a n/a n/a
2018-05-14 2018-03-31 13F/A ADVANSIX Cmn Put 12,300 428 n/a n/a n/a
2018-05-11 2018-03-31 13F ADVANSIX Cmn Put 12,300 428 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.