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Kaiser Aluminum KALU

US equityMarket cap rank #2609Aluminum
$155.76 +$3.74 (+2.46%)
Market closed · Oct 6, 4:10 am ET · Last extended-hours $155.76 0.00%
Open$152.62
Prev close$152.03
Day range$150.80 – $158.35
Volume257.5K
Market cap$2.55B
P/E (TTM)11.6
Dividend yield1.98%

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership103.4%-0.15 pts vs. prior quarter
Institutions holding401+3 vs. prior quarter
Insider trades (recent)21 buys / 25 sellsNet selling
Short interest5.79% of floatDays to cover 5.1 · as of 15 Sep 2026
Short-sale volume share13.3%5-day average of daily volume

Short-sale volume as % of daily volume

8%12%17%21%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$2.09M (7 inflow days, 13 outflow days).

The five largest holders on file together own 44.4% of shares outstanding.

Largest holders

  • BlackRock17.72%
  • Vanguard Portfolio Management, LLC8.72%
  • State Street Global Advisors8.13%
  • Vanguard Capital Management, LLC5.08%
  • Dimensional Fund Advisors4.79%
  • Macquarie Investment Management Business Trust4.19%
  • Geode Capital Management, LLC2.91%
  • American Century Investment Management2.72%

By investor type

  • Mutual Fund91.93%
  • Hedge Fund4.41%
  • Public Company2.44%
  • Private Company1.97%
  • Government Pension Fund1.42%
  • Individual/Insider1.25%
  • Insurance Company0.66%
  • Sovereign Wealth Fund0.30%

Reported short interest has risen from 5.58% to 5.79% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 946,598 5.8% 5.1
31 Aug 2026 918,977 5.6% 3.7
14 Aug 2026 862,831 5.3% 3.8
31 Jul 2026 734,539 4.5% 2.6
15 Jul 2026 786,386 4.8% 3.1
30 Jun 2026 912,142 5.6% 2.3

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