AdvanSix Inc.
ASIX- Exchange
- NYSE
- Industry
- Plastic Materials, Synth Resins & Nonvulcan Elastomers
- SEC CIK
- 0001673985
No open-market purchases or sales by AdvanSix Inc. insiders were filed in the last 90 days; 259 institutions reported holding it in 13F filings for Q2 2026, worth $498.3M in total; no superinvestor holds it.
Holders of 5% or more of ASIX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of AdvanSix Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 7.10%1.92M shares | −4.80 ppfrom 11.90% | Apr 30, 20253 filings | Apr 24, 2026 | SEC |
| CastleKnight Master Fund LP | 13G | 6.20%1.67M shares | New | May 14, 20261 filing | May 14, 2026 | SEC |
| Dimensional Fund Advisors LP | 13G | 5.20%1.41M shares | +0.40 ppfrom 4.80% | Feb 10, 20234 filings | Jul 14, 2026 | SEC |
| American Century Investment Management Inc | 13G | 5.10%1.36M shares | New | Aug 14, 20261 filing | Aug 14, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
28 Schedule 13D and 13G filings on AdvanSix Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 14, 20262:29 PM ET | American Century Investment Management Incand 2 others | 13G | 5.10%1.36M shares | New | Jun 30, 2026 | SEC |
| Jul 14, 20261:27 PM ET | Dimensional Fund Advisors LP | 13G | 5.20%1.41M shares | +0.40 ppfrom 4.80% | Jun 30, 2026 | SEC |
| May 14, 20264:28 PM ET | CastleKnight Master Fund LPand 5 others | 13G | 6.20%1.67M shares | New | May 7, 2026 | SEC |
| Apr 24, 20264:11 PM ET | BlackRock, Inc. | 13G/A | 7.10%1.92M shares | −4.80 ppfrom 11.90% | Mar 31, 2026 | SEC |
| Mar 26, 20263:11 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −6.35 ppfrom 6.35%Below 5% | Mar 13, 2026 | SEC |
| Feb 11, 20261:44 PM ET | Victory Capital Management Inc | 13G/A | 0.51%137.6K shares | −7.61 ppfrom 8.12%Below 5% | Sep 30, 2025 | SEC |
| Jan 30, 20261:26 PM ET | Vanguard Group Inc | 13G/A | 6.35%1.71M shares | – | Dec 31, 2025 | SEC |
| Jan 21, 20261:21 PM ET | Dimensional Fund Advisors LP | 13G/A | 4.80%1.30M shares | –Below 5% | Dec 31, 2025 | SEC |
| Jan 8, 20261:28 PM ET | BlackRock, Inc. | 13G/A | 11.90%3.20M shares | −5.10 ppfrom 17.00% | Dec 31, 2025 | SEC |
| Oct 30, 20259:57 AM ET | Victory Capital Management Inc | 13G/A | 8.12%2.18M shares | −1.13 ppfrom 9.25% | Sep 30, 2025 | SEC |
| Apr 30, 20259:58 AM ET | BlackRock, Inc. | 13G/A | 17.00%4.54M shares | – | Mar 31, 2025 | SEC |
| Nov 6, 20242:21 PM ET | Victory Capital Management Inc | 13G | 9.25%2.47M shares | – | Sep 30, 2024 | SEC |
| Feb 13, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2024 | Dimensional Fund Advisors LP | 13G/AOld format | – | – | – | SEC |
| Feb 7, 2024 | Victory Capital Management Inc | 13GOld format | – | New | – | SEC |
| Jan 19, 20242:40 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2023 | Dimensional Fund Advisors LP | 13GOld format | – | New | – | SEC |
| Feb 9, 2023 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 26, 20238:52 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 20, 20239:43 AM ET | BlackRock Inc. | 13GOld format | – | – | – | SEC |
| Feb 15, 2022 | Towle & Co | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2022 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 27, 20225:14 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 26, 20229:16 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Firefly Value Partners, LP | 13G/AOld format | – | – | – | SEC |
| Feb 12, 2021 | Towle & Co | 13GOld format | – | New | – | SEC |
| Feb 10, 2021 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 25, 20214:51 PM ET | BlackRock Inc. | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
49 notices from officers, directors and other affiliates planning to sell AdvanSix Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Jun 10, 20264:13 PM ET | Gramm ChristopherOfficer | 2.00K | $42.8K | Jun 10, 2026 | Merrill Lynch | SEC |
| May 13, 20264:09 PM ET | Gramm ChristopherOfficer | 2.00K | $45.1K | May 13, 2026 | Merrill Lynch | SEC |
| Oct 3, 20254:12 PM ET | Kintiroglou Achilles B.Officer | 577 | $11.5K | Oct 3, 202510b5-1 | Merrill Lynch | SEC |
| Sep 2, 20255:15 PM ET | Kintiroglou Achilles B.Officer | 571 | $12.1K | Sep 2, 202510b5-1 | Merrill Lynch | SEC |
| Aug 1, 20255:16 PM ET | Kintiroglou Achilles B.Officer | 571 | $11.5K | Aug 1, 202510b5-1 | Merrill Lynch | SEC |
| Jul 2, 20254:49 PM ET | Kintiroglou Achilles B.Officer | 571 | $14.2K | Jul 2, 202510b5-1 | Merrill Lynch | SEC |
| Jun 2, 20254:22 PM ET | Kintiroglou Achilles B.Officer | 571 | $13.5K | Jun 2, 202510b5-1 | Merrill Lynch | SEC |
| May 1, 20254:40 PM ET | Kintiroglou Achilles B.Officer | 3.24K | $69.1K | May 1, 202510b5-1 | Merrill Lynch | SEC |
| Apr 1, 20254:42 PM ET | Kintiroglou Achilles B.Officer | 4.00K | $89.0K | Apr 1, 202510b5-1 | Merrill Lynch | SEC |
| Mar 3, 20254:04 PM ET | Kintiroglou Achilles B.Officer | 4.00K | $111.0K | Mar 3, 202510b5-1 | Merrill Lynch | SEC |
| Feb 3, 20254:33 PM ET | Kane Erin NOfficer | 5.00K | $151.0K | Feb 3, 202510b5-1 | Merrill Lynch | SEC |
| Jan 2, 20254:09 PM ET | Kane Erin NOfficer | 5.00K | $140.8K | Jan 2, 202510b5-1 | Merrill Lynch | SEC |
| Dec 16, 20244:20 PM ET | Preston MichaelOfficer | 3.54K | $108.0K | Dec 16, 202410b5-1 | Merrill Lynch | SEC |
| Dec 13, 20245:24 PM ET | Preston MichaelOfficer | 10.8K | $332.8K | Dec 13, 202410b5-1 | Merrill Lynch | SEC |
| Dec 2, 20244:15 PM ET | Kane Erin NOfficer | 5.00K | $161.5K | Dec 2, 202410b5-1 | Merrill Lynch | SEC |
| Nov 25, 20244:05 PM ET | Gramm ChristopherOfficer | 1.95K | $62.4K | Nov 25, 202410b5-1 | Merrill Lynch | SEC |
| Nov 7, 20244:23 PM ET | Gramm ChristopherOfficer | 505 | $16.2K | Nov 7, 202410b5-1 | Merrill Lynch | SEC |
| Nov 6, 20244:57 PM ET | Gramm ChristopherOfficer | 2.44K | $77.9K | Nov 6, 202410b5-1 | Merrill Lynch | SEC |
| Nov 1, 20245:22 PM ET | Kintiroglou Achilles B.Officer | 363 | $11.3K | Nov 1, 202410b5-1 | Merrill Lynch | SEC |
| Nov 1, 20245:11 PM ET | Kane Erin NOfficer | 5.00K | $151.8K | Nov 1, 202410b5-1 | Merrill Lynch | SEC |
| Oct 4, 20244:34 PM ET | Gramm ChristopherOfficer | 270 | $8.64K | Oct 4, 202410b5-1 | Merrill Lynch | SEC |
| Oct 1, 20244:25 PM ET | Kintiroglou Achilles B.Officer | 350 | $10.6K | Oct 1, 202410b5-1 | Merrill Lynch | SEC |
| Oct 1, 20244:24 PM ET | Kane Erin NOfficer | 5.00K | $151.4K | Oct 1, 202410b5-1 | Merrill Lynch | SEC |
| Sep 3, 20245:03 PM ET | Kintiroglou Achilles B.Officer | 350 | $10.1K | Sep 3, 202410b5-1 | Merrill Lynch | SEC |
| Sep 3, 20245:01 PM ET | Kane Erin NOfficer | 5.00K | $141.4K | Sep 3, 202410b5-1 | Merrill Lynch | SEC |
Showing the latest 25. See the ASIX notices from the last 12 months