Public ownership evidence

Koppers Holdings, Inc. (KOP) Ownership Disclosures

Read KOP insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Koppers Holdings, Inc.: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-09-15
Trade date
2026-09-14
Reporting owners
WILKERSON SONJA MICHELLE
Code
A
Shares
29.35
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001245155-26-000006
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read KOP fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read KOP fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity

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2026-09-152026-09-14WILKERSON SONJA MICHELLEA29.35Not reported
2026-09-152026-09-14Feng XudongA32.95Not reported
2026-09-152026-09-14MOTLEY DAVID LA19.98Not reported
2026-09-152026-09-14Sandifer Andrew DA13.52Not reported
2026-09-022026-08-31BALL M LEROYS4,000Not reported
2026-08-212026-08-19BALL M LEROYS3,000Not reported
2026-08-142026-08-12Lucas Stephen GS1,308Not reported
2026-08-132026-08-11Sullivan James A.S7,500Not reported
2026-08-122026-08-10Pearce Bradley AS2,000Not reported
2026-08-122026-08-07Sullivan James A.S100Not reported
2026-08-122026-08-07Sullivan James A.S79,900Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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Advisors Asset Management, Inc.2020-06-302026-08-281,083$20,404None
Advisors Asset Management, Inc.2024-03-312026-08-276,571$362,522None
Advisors Asset Management, Inc.2025-03-312026-08-278,399$235,172None
Advisors Asset Management, Inc.2020-12-312026-08-271,007$31,000None
Advisors Asset Management, Inc.2021-03-312026-08-27980$34,065None
Advisors Asset Management, Inc.2020-09-302026-08-271,072$22,416None
Advisors Asset Management, Inc.2025-09-302026-08-278,089$226,492None
Advisors Asset Management, Inc.2023-12-312026-08-272,997$153,506None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-269,900$444,510None
Advisors Asset Management, Inc.2025-06-302026-08-258,265$265,720None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2519,975$896,878None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25896,878$19,975,000None
Advisors Asset Management, Inc.2024-09-302026-08-228,369$305,720None
Advisors Asset Management, Inc.2024-06-302026-08-228,361$309,273None
Advisors Asset Management, Inc.2024-12-312026-08-228,352$270,605None
Advisors Asset Management, Inc.2020-03-312026-08-221,021$12,630None
Advisors Asset Management, Inc.2019-03-312026-08-191,001$26,006None
Ensign Peak Advisors, Inc2026-03-312026-08-192,170$83,936None
Ensign Peak Advisors, Inc2025-12-312026-08-192,170$58,764None
Ensign Peak Advisors, Inc2025-09-302026-08-196,470$181,160None
Empowered Funds, LLC2026-06-302026-08-18102,787$4,615,136None
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO2026-06-302026-08-181,120$50,288None
SEI INVESTMENTS CO2026-06-302026-08-1533,128$1,487,447None
SEI INVESTMENTS CO2026-06-302026-08-15690$30,980None
Quarry LP2026-06-302026-08-1561$2,739None
Integrated Quantitative Investments LLC2026-06-302026-08-158,436$378,776None
CSM Advisors, LLC2026-06-302026-08-15194,345$8,725,000None
XTX Topco Ltd2026-06-302026-08-1546,434$2,084,887None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15384,122$17,247,078None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15384,122$17,247,078None
OSAIC HOLDINGS, INC.2026-06-302026-08-1514$629None
OSAIC HOLDINGS, INC.2026-06-302026-08-15410$18,409None
QUADRANT CAPITAL GROUP LLC2026-06-302026-08-155,568$250,003None
Squarepoint Ops LLC2026-06-302026-08-1511,304$507,550None
Simcoe Capital Management, LLC2026-06-302026-08-151,416,160$63,585,584None
MetLife Investment Management, LLC2026-06-302026-08-1511,217$503,643None
Engineers Gate Manager LP2026-06-302026-08-1511,940$536,106None
JANE STREET GROUP, LLC2026-06-302026-08-1544,873$2,014,798None
JANE STREET GROUP, LLC2026-06-302026-08-159,137$410,251None
State of Tennessee, Department of Treasury2026-06-302026-08-1512,682$569,422None
PDT Partners, LLC2026-06-302026-08-159,583$430,277None
Legal & General Group Plc2026-06-302026-08-156,784$304,602None
Legal & General Group Plc2026-06-302026-08-153,446$154,725None
Legal & General Group Plc2026-06-302026-08-1529,493$1,324,236None
HRT FINANCIAL LP2026-06-302026-08-1512,470$559,000None
Ensign Peak Advisors, Inc2026-06-302026-08-151,870$83,963None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1517,700$794,730Call
Quantum Portfolio Management LLC2026-06-302026-08-15649$29,140None
Gotham Asset Management, LLC2026-06-302026-08-1511,522$517,338None
IRONWOOD INVESTMENT MANAGEMENT LLC2026-06-302026-08-1558,116$2,609,408None

90-day public filing window, up to 50 source positions.

Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗VIRGINIA RETIREMENT SYSTEMS ET Al ↗Advisors Asset Management, Inc. ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

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