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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 2026-11-07T14:03:26.246Z

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2026-09-152026-09-14WILKERSON SONJA MICHELLEA29.35Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-09-14 and its public availability date is 2026-09-15. Subtracting those calendar dates gives 1 day of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code A: a award. An award is an acquisition but is not an open-market purchase. A purchase-following rule must not count it as code P.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

Recent Form 4 activity

Inspect all 11 displayed rows: 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

Inspect all 50 displayed rows: 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.

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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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.

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.