KOPNYSE

Koppers Holdings Inc.

Alert me on KOP

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Sep 2 Sale BALL M LEROY Insider

1 week

−0.8%S&P −1.0%

1 month

−1.5%S&P +0.8%

3 months

Result in21 trading days

6 months

Result in84 trading days

Aug 21 Sale BALL M LEROY Insider

1 week

+3.2%S&P +0.5%

1 month

+2.2%S&P +1.3%

3 months

Result in13 trading days

6 months

Result in76 trading days

Aug 14 Sale Lucas Stephen G Insider

1 week

−4.1%S&P −1.4%

1 month

−2.7%S&P −2.4%

3 months

Result in8 trading days

6 months

Result in71 trading days

Aug 13 Sale Sullivan James A. Insider

1 week

−0.7%S&P −2.0%

1 month

−0.3%S&P −2.2%

3 months

Result in7 trading days

6 months

Result in70 trading days

Aug 12 Sale Sullivan James A. Insider

1 week

−1.0%S&P −0.4%

1 month

+2.4%S&P −1.1%

3 months

Result in6 trading days

6 months

Result in69 trading days

Show all 11

Aug 12 Sale Pearce Bradley A Insider

1 week

−1.0%S&P −0.4%

1 month

+2.4%S&P −1.1%

3 months

Result in6 trading days

6 months

Result in69 trading days

Jun 24 Sale BALL M LEROY Insider

1 week

+1.5%S&P +1.7%

1 month

+14.4%S&P +0.8%

3 months

+5.6%S&P +5.0%

6 months

Result in35 trading days

Jun 16 Sale BALL M LEROY Insider

1 week

−1.4%S&P −2.0%

1 month

+10.4%S&P −0.7%

3 months

+5.2%S&P +0.8%

6 months

Result in30 trading days

May 15 Sale BALL M LEROY Insider

1 week

−0.8%S&P +0.9%

1 month

+9.6%S&P +1.5%

3 months

+16.9%S&P +4.8%

6 months

Result in9 trading days

Mar 19 Sale BALL M LEROY Insider

1 week

+3.5%S&P −2.0%

1 month

0.0%S&P +7.7%

3 months

+17.0%S&P +13.8%

6 months

+21.5%S&P +16.3%

Mar 5 Sale BALL M LEROY Insider

1 week

−1.5%S&P −2.2%

1 month

−5.6%S&P −3.0%

3 months

+11.4%S&P +11.4%

6 months

+24.1%S&P +14.1%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for KOP

86 held · newest 586 held · newest 2

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See all 86 filings for KOP

Aeon news and offers by email

New sources, new features and offers like our founding price. A few times a month at most. Stop any time.

Signal history

No signal for this ticker yet. A signal is written when insider buying here scores one dot or more.

Stakes

Sep 30, 2026 Schedule 13G

Vanguard Capital Management: 5%, 954,282 shares

Oct 20, 2026 Schedule 13D, amended

Simcoe Capital Management, LLC: 5.6%, 1,063,279 shares

Sep 30, 2026 Schedule 13G, amended

PZENA INVESTMENT MANAGEMENT LLC: 4.9%, 926,505 shares

Sep 30, 2026 Schedule 13G, amended

Dimensional Fund Advisors LP: 6.7%, 1,265,529 shares

Jun 30, 2026 Schedule 13G, amended

Vanguard Capital Management: 5%, 955,150 shares

May 12, 2026 Schedule 13D

Simcoe Capital Management, LLC: 7%, 1,349,005 shares

Mar 31, 2026 Schedule 13G, amended

Fuller & Thaler Asset Management, Inc.: 5%, 978,590 shares

Mar 31, 2026 Schedule 13G

Vanguard Capital Management: 5.1%, 983,577 shares

Mar 31, 2026 Schedule 13G, amended

BlackRock, Inc.: 15.3%, 2,952,521 shares

Mar 13, 2026 Schedule 13G, amended

The Vanguard Group: 0%, 0 shares

Sep 30, 2025 Schedule 13G, amended

The Vanguard Group: 7.8%, 1,539,485 shares

Schedule 13D is filed within 5 business days of crossing 5 percent by an investor who may seek to influence the company. Schedule 13G is filed by a passive holder, and a large institution has up to 45 days after the quarter end.

Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

No lobbying reports on file.