AdvanSix Inc.
AdvanSix Inc. (ASIX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ASIX · as of Sep 30, 2025
Ownership Breakdown
275
Institutional Holders
▼ 5 vs Q2
$473.90M
Total Inst. Value
▼ $110.41M vs Q2
26.96M
Shares Outstanding
freeFloat 90.39%
24.45M
13F Shares Held
▼ 149,362 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ASIX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. plastic materials, synth resins & nonvulcan elastomers | 4.82M | 17.94% | 17.94% | $93.41B | Nov 12, 2025 | ▲ 158.8K |
VICTORY CAPITAL MANAGEMENT INC plastic materials, synth resins & nonvulcan elastomers | 2.18M | 8.11% | 8.11% | $42.22B | Nov 12, 2025 | ▼ 257.9K |
VANGUARD GROUP INC plastic materials, synth resins & nonvulcan elastomers | 1.99M | 7.41% | 7.41% | $38.57B | Nov 7, 2025 | ▲ 10.6K |
DIMENSIONAL FUND ADVISORS LP plastic materials, synth resins & nonvulcan elastomers | 1.51M | 5.64% | 5.64% | $29.35B | Nov 12, 2025 | ▼ 33.7K |
STATE STREET CORP plastic materials, synth resins & nonvulcan elastomers | 1.05M | 3.90% | 3.90% | $20.29B | Nov 14, 2025 | ▼ 3.8K |
AMERICAN CENTURY COMPANIES INC plastic materials, synth resins & nonvulcan elastomers | 967.6K | 3.60% | 3.60% | $18.75B | Nov 12, 2025 | ▲ 81.9K |
ALLIANCEBERNSTEIN L.P. plastic materials, synth resins & nonvulcan elastomers | 948.5K | 3.53% | 3.53% | $18.38B | Nov 14, 2025 | ▲ 337.9K |
WELLINGTON MANAGEMENT GROUP LLP plastic materials, synth resins & nonvulcan elastomers | 699.7K | 2.60% | 2.60% | $13.56B | Nov 14, 2025 | ▼ 10.1K |
GEODE CAPITAL MANAGEMENT, LLC plastic materials, synth resins & nonvulcan elastomers | 635.2K | 2.36% | 2.36% | $12.31B | Nov 12, 2025 | ▲ 2.7K |
LSV ASSET MANAGEMENT plastic materials, synth resins & nonvulcan elastomers | 622.7K | 2.32% | 2.32% | $12.07B | Nov 6, 2025 | ▼ 7.0K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
25
Increased
+1.45M shares2
New Positions
first time holders21
Decreased
−1.28M shares0
Sold Out
fully exitedNet shares change (top 50)
+167.4K
+1.45M / −1.28M
Net new holders
+6
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ASIX insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
2
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Day Patrick C. SVP, CFO | Apr 27, 2026 | Award | 19,019 | $23.66 | $450.0K | 38.0K | Form 4 ↗ |
Day Patrick C. SVP, CFO | Apr 27, 2026 | Award | 19,019 | $23.66 | $450.0K | 19.0K | Form 4 ↗ |
Williams Patrick director | Mar 31, 2026 | Award | 537 | $24.40 | $13.1K | 36.6K | Form 4 ↗ |
Ryan Rachael E VP, Controller | Mar 24, 2026 | Tax Withhold | 2,074 | $22.02 | $45.7K | 16.5K | Form 4 ↗ |
Gramm Christopher VP and Interim CFO | Feb 28, 2026 | Tax Withhold | 2,624 | $17.47 | $45.8K | 73.0K | Form 4 ↗ |
Kintiroglou Achilles B. SVP, General Counsel | Feb 28, 2026 | Tax Withhold | 8,008 | $17.47 | $139.9K | 50.4K | Form 4 ↗ |
SLIETER KELLY SVP, Chief HR Officer | Feb 28, 2026 | Tax Withhold | 5,424 | $17.47 | $94.8K | 65.0K | Form 4 ↗ |
Kane Erin N Chief Executive Officer | Feb 28, 2026 | Tax Withhold | 33,642 | $17.47 | $587.7K | 623.1K | Form 4 ↗ |
Ryan Rachael E VP, Controller | Feb 26, 2026 | Award | 5,621 | $17.79 | $100.0K | 18.6K | Form 4 ↗ |
Kintiroglou Achilles B. SVP, General Counsel | Feb 26, 2026 | Award | 28,106 | $17.79 | $500.0K | 58.4K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
AdvanSix Inc. (ASIX) is primarily owned by institutional investors, who hold approximately 90.7% of total shares outstanding. Company insiders own approximately 9.61%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of AdvanSix Inc. is BLACKROCK, INC., holding approximately 4.82 million shares — equal to 17.94% of outstanding shares — as of September 30, 2025.
A total of 275 institutional investors currently hold ASIX stock, with a combined institutional value of approximately $473,896,415 as of the most recent 13F filing period.
Frequently asked questions
ASIX ownershipAdvanSix Inc. (ASIX) is primarily owned by institutional investors, who hold approximately 90.7% of shares. The largest shareholder is BLACKROCK, INC. with a 17.94% stake. Company insiders hold 9.61%. Data sourced from SEC Form 13F as of September 30, 2025.