Dimensional Fund Advisors Lp ownership in ASIX / AdvanSix Inc.

AdvanSix Inc.

MX ˙ BMV ˙ US00773T1016

Security	MX:ASIX / AdvanSix Inc.
Institution	Dimensional Fund Advisors Lp
Latest Disclosed Ownership	1,302,875 shares
Ownership	4.80%

2026-01-21 - Dimensional Fund Advisors Lp has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,302,875 shares of AdvanSix Inc. (MX:ASIX). This represents 4.8 percent ownership of the company. In their previous filing dated 2024-02-09 , Dimensional Fund Advisors Lp had reported owning 1,699,618 shares, indicating a decrease of -23.34 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File Date	Effective Date	Form	Prev Shares	Latest Shares	ΔShares (Percent)	Ownership (Percent)	ΔOwnership (Percent)
2026-01-21	2026-01-21	13G/A	1,699,618	1,302,875	-23.34	4.80	-23.81
2024-02-09	2024-02-09	13G/A	1,575,723	1,699,618	7.86	6.30	10.53
2023-02-10	2023-02-10	13G		1,575,723		5.70

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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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Disclosed Equity Positions (from 13F/NPORT Filings)

File Date	Effective Date	Form	Security	Class	ID	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-07	2026-03-31	13F	ADVANSIX	COM	00773T101	1,311,006	8,131	0.62	31,988	41.92	0.0066
2026-02-12	2025-12-31	13F	ADVANSIX	COM	00773T101	1,302,875	-211,564	-13.97	22,540	-23.20	0.0047
2025-11-12	2025-09-30	13F	ADVANSIX	COM	00773T101	1,514,439	-33,715	-2.18	29,350	-20.18	0.0063
2025-08-12	2025-06-30	13F	ADVANSIX	COM	00773T101	1,548,154	-20,516	-1.31	36,770	3.49	0.0085
2025-05-13	2025-03-31	13F	ADVANSIX	COM	00773T101	1,568,670	-10,238	-0.65	35,530	-21.02	0.0088
2025-02-13	2024-12-31	13F	ADVANSIX	COM	00773T101	1,578,908	12,793	0.82	44,982	-5.46	0.0108
2024-11-07	2024-09-30	13F	ADVANSIX	COM	00773T101	1,566,115	1,806	0.12	47,579	32.70	0.0115
2024-08-09	2024-06-30	13F	ADVANSIX	COM	00773T101	1,564,309	-38,614	-2.41	35,854	-21.79	0.0094
2024-05-10	2024-03-31	13F	ADVANSIX	COM	00773T101	1,602,923	-96,674	-5.69	45,844	-9.97	0.0124
2024-02-07	2023-12-31	13F	ADVANSIX	COM	00773T101	1,699,597	-25,415	-1.47	50,921	-5.02	0.0149
2023-11-09	2023-09-30	13F	ADVANSIX	COM	00773T101	1,725,012	100,402	6.18	53,614	-5.66	0.0176
2023-08-09	2023-06-30	13F	ADVANSIX	COM	00773T101	1,624,610	811	0.05	56,830	-8.55	0.0181
2023-05-12	2023-03-31	13F	ADVANSIX	COM	00773T101	1,623,799	48,076	3.05	62,142	105,223.73	0.0209
2023-02-09	2022-12-31	13F	ADVANSIX	COM	00773T101	1,575,723	68,726	4.56	60	-99.88	0.0177
2022-11-10	2022-09-30	13F	ADVANSIX	COM	00773T101	1,506,997	111,438	7.99	48,375	3.66	0.0186
2022-08-12	2022-06-30	13F	ADVANSIX	COM	00773T101	1,395,559	20,719	1.51	46,666	-33.56	0.0167
2022-05-13	2022-03-31	13F	ADVANSIX	COM	00773T101	1,374,840	28,993	2.15	70,241	10.46	0.0216
2022-02-09	2021-12-31	13F	ADVANSIX	COM	00773T101	1,345,847	21,061	1.59	63,591	20.76	0.0192
2021-11-12	2021-09-30	13F	ADVANSIX	COM	00773T101	1,324,786	37,015	2.87	52,661	36.95	0.0170
2021-08-12	2021-06-30	13F	ADVANSIX	COM	00773T101	1,287,771	54,005	4.38	38,452	16.20	0.0122
2021-05-14	2021-03-31	13F	ADVANSIX	COM	00773T101	1,233,766	16,317	1.34	33,091	35.97	0.0109
2021-03-08	2020-12-31	13F/A-2	ADVANSIX	COM	00773T101	1,217,449	-961	-0.08	24,337	55.08	0.0088
2021-02-11	2020-12-31	13F	ADVANSIX	COM	00773T101	1,217,449	-961		24,337		8,789.2308
2020-11-12	2020-09-30	13F	ADVANSIX	COM	00773T101	1,218,410	-20,044	-1.62	15,693	7.94	0.0067
2020-08-13	2020-06-30	13F	ADVANSIX	COM	00773T101	1,238,454	-4,362	-0.35	14,539	22.65	0.0064
2020-05-14	2020-03-31	13F	ADVANSIX	COM	00773T101	1,242,816	41,099	3.42	11,854	-50.58	0.0062
2020-02-14	2019-12-31	13F	ADVANSIX	COM	00773T101	1,201,717	85,398	7.65	23,985	-16.46	0.0087
2019-11-12	2019-09-30	13F	ADVANSIX	COM	00773T101	1,116,319	60,966	5.78	28,712	11.36	0.0112
2019-08-13	2019-06-30	13F	ADVANSIX	COM	00773T101	1,055,353	49,546	4.93	25,782	-10.28	0.0100
2019-08-12	2019-03-31	13F/A-2	ADVANSIX	COM	00773T101	1,005,807	62,638	6.64	28,736	25.17	0.0114
2019-05-10	2019-03-31	13F	ADVANSIX	COM	00773T101	1,005,807	62,638		28,736
2019-02-26	2018-12-31	13F/A-1	ADVANSIX	COM	00773T101	943,169	35,803	3.95	22,957	-25.48	0.0104
2019-02-13	2018-12-31	13F	ADVANSIX	COM	00773T101	943,169	35,803		22,957
2018-11-13	2018-09-30	13F	ADVANSIX	COM	00773T101	907,366	94,456	11.62	30,805	3.45	0.0117
2018-08-10	2018-06-30	13F	ADVANSIX	COM	00773T101	812,910	195,413	31.65	29,777	38.65	0.0119
2018-05-11	2018-03-31	13F	ADVANSIX	COM	00773T101	617,497	97,836	18.83	21,477	-1.77	0.0090
2018-02-12	2017-12-31	13F	ADVANSIX	COM	00773T101	519,661	70,257	15.63	21,863	22.39	0.0091
2017-11-13	2017-09-30	13F	ADVANSIX	COM	00773T101	449,404	71,649	18.97	17,864	51.36	0.0078
2017-08-11	2017-06-30	13F	ADVANSIX	COM	00773T101	377,755	131,124	53.17	11,802	75.16	0.0054
2017-05-12	2017-03-31	13F	ADVANSIX	COM	00773T101	246,631	193,661	365.61	6,738	474.42	0.0032
2017-02-09	2016-12-31	13F	ADVANSIX	COM	00773T101	52,970	52,970		1,173		0.0006

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.