Kaiser Aluminum Corporation
Kaiser Aluminum Corporation (KALU) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · KALU · as of Sep 30, 2025
Ownership Breakdown
214
Institutional Holders
▲ 13 vs Q2
$1.18B
Total Inst. Value
▼ $47.63M vs Q2
16.34M
Shares Outstanding
freeFloat 97.65%
15.30M
13F Shares Held
▼ 73,618 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
KALU largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. rolling drawing & extruding of nonferrous metals | 3.03M | 18.75% | 18.75% | $233.52B | Nov 12, 2025 | ▼ 9.8K |
VANGUARD GROUP INC rolling drawing & extruding of nonferrous metals | 2.11M | 13.09% | 13.09% | $162.96B | Nov 7, 2025 | ▲ 1.4K |
STATE STREET CORP rolling drawing & extruding of nonferrous metals | 1.15M | 7.14% | 7.14% | $88.96B | Nov 14, 2025 | ▼ 1.4K |
MACQUARIE GROUP LTD rolling drawing & extruding of nonferrous metals | 1.01M | 6.27% | 6.27% | $78.04B | Nov 13, 2025 | ▲ 1.3K |
DIMENSIONAL FUND ADVISORS LP rolling drawing & extruding of nonferrous metals | 817.7K | 5.07% | 5.07% | $63.10B | Nov 12, 2025 | ▲ 4.7K |
BARROW HANLEY MEWHINNEY & STRAUSS LLC rolling drawing & extruding of nonferrous metals | 772.8K | 4.79% | 4.79% | $59.63B | Nov 13, 2025 | ▼ 100.0K |
AMERICAN CENTURY COMPANIES INC rolling drawing & extruding of nonferrous metals | 588.7K | 3.65% | 3.65% | $45.43B | Nov 12, 2025 | ▲ 52.5K |
WELLINGTON MANAGEMENT GROUP LLP rolling drawing & extruding of nonferrous metals | 502.4K | 3.11% | 3.11% | $38.77B | Nov 14, 2025 | ▲ 5.6K |
GEODE CAPITAL MANAGEMENT, LLC rolling drawing & extruding of nonferrous metals | 399.2K | 2.47% | 2.47% | $30.81B | Nov 12, 2025 | ▲ 7.6K |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC rolling drawing & extruding of nonferrous metals | 294.8K | 1.83% | 1.83% | $22.75B | Nov 10, 2025 | ▼ 5.8K |
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
+348.4K shares2
New Positions
first time holders22
Decreased
−291.4K shares0
Sold Out
fully exitedNet shares change (top 50)
+57.0K
+348.4K / −291.4K
Net new holders
+5
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
KALU 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.
12
Buy transactions
8
Sell transactions
1.50
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 |
|---|---|---|---|---|---|---|---|
arnold michael c director | Jun 4, 2026 | Award | 786 | — | — | 11.4K | Form 4 ↗ |
Glas Kimberly Thompson director | Jun 4, 2026 | Award | 786 | — | — | 3.5K | Form 4 ↗ |
STEBBINS DONALD J director | Jun 4, 2026 | Award | 631 | $178.10 | $112.4K | 15.4K | Form 4 ↗ |
STEBBINS DONALD J director | Jun 4, 2026 | Award | 786 | — | — | 14.8K | Form 4 ↗ |
Wilcox Brett director | Jun 4, 2026 | Award | 328 | $178.10 | $58.4K | 3.0K | Form 4 ↗ |
Wilcox Brett director | Jun 4, 2026 | Award | 786 | — | — | 2.7K | Form 4 ↗ |
HOFFMAN JAMES DONALD director | Jun 4, 2026 | Award | 589 | $178.10 | $104.9K | 3.8K | Form 4 ↗ |
HOFFMAN JAMES DONALD director | Jun 4, 2026 | Award | 786 | — | — | 3.2K | Form 4 ↗ |
Grimley Richard P. director | Jun 4, 2026 | Award | 786 | — | — | 5.4K | Form 4 ↗ |
MINOR GLENDA J director | Jun 4, 2026 | Award | 335 | $178.10 | $59.7K | 4.5K | 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
Kaiser Aluminum Corporation (KALU) is primarily owned by institutional investors, who hold approximately 93.6% of total shares outstanding. Company insiders own approximately 2.35%, while retail and public investors account for the remaining 4.01%.
The largest institutional shareholder of Kaiser Aluminum Corporation is BLACKROCK, INC., holding approximately 3.03 million shares — equal to 18.75% of outstanding shares — as of September 30, 2025.
A total of 214 institutional investors currently hold KALU stock, with a combined institutional value of approximately $1.18 billion as of the most recent 13F filing period.
Frequently asked questions
KALU ownershipKaiser Aluminum Corporation (KALU) is primarily owned by institutional investors, who hold approximately 93.6% of shares. The largest shareholder is BLACKROCK, INC. with a 18.75% stake. Company insiders hold 2.35%. Data sourced from SEC Form 13F as of September 30, 2025.