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Public ownership evidence

Costco Wholesale Corp (COST) Ownership Disclosures

Read COST 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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2026-10-272026-10-22Sullivan John ChristopherA4,552Not reported

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

The displayed observation date is 2026-10-22 and its public availability date is 2026-10-27. Subtracting those calendar dates gives 5 days 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 24 displayed rows: Recent Form 4 activity

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2026-10-272026-10-22Sullivan John ChristopherA4,552Not reported
2026-10-272026-10-22POLIT JAVIERA4,129Not reported
2026-10-272026-10-22MILLERCHIP GARYA6,140Not reported
2026-10-272026-10-22Vachris Roland MichaelA13,973Not reported
2026-10-272026-10-22Wilderotter Mary AgnesA266Not reported
2026-10-272026-10-22STANTON JOHN WA266Not reported
2026-10-272026-10-22Raimondo Gina MarieA266Not reported
2026-10-272026-10-22RAIKES JEFFREY SA266Not reported
2026-10-262026-10-22JEWELL SARAH MR SALLYA266Not reported
2026-10-262026-10-22JAMES HAMILTON EA266Not reported
2026-10-262026-10-22Foulkes HelenaA266Not reported
2026-10-262026-10-22DENMAN KENNETH DA266Not reported
2026-10-262026-10-22DECKER SUSAN LA266Not reported
2026-10-262026-10-22Barbre Tiffany MarieA1,965Not reported
2026-10-142026-10-13Wilcox William RichardS1,100Not reported
2026-09-302026-09-29Frates CatonS800.64Not reported
2026-09-302026-09-29Adamo ClaudineS2,200Not reported
2026-09-142026-09-10Wilcox William RichardA4,129Not reported
2026-09-142026-09-10Rubanenko YoramA4,129Not reported
2026-09-142026-09-10Riel PierreA4,552Not reported
2026-09-142026-09-10Klauer James CA4,129Not reported
2026-09-142026-09-10Jones Teresa A.A4,129Not reported
2026-09-142026-09-10Frates CatonA4,552Not reported
2026-09-142026-09-10Adamo ClaudineA4,129Not 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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Cornerstone Financial Management LLC2026-06-302026-08-29152$142,191None
Cornerstone Financial Management LLC2026-03-312026-08-29131$130,532None
Cornerstone Financial Management LLC2025-12-312026-08-29120$103,481None
NWM ADVISORS, LLC2026-06-302026-08-29328$306,834None
B. Riley Wealth Advisors, Inc.2025-03-312026-08-29300$283,734Call
B. Riley Wealth Advisors, Inc.2025-03-312026-08-2922,086$20,888,139None
OPTIMIZE FINANCIAL INC.2026-06-302026-08-28634$593,088None
Advisors Asset Management, Inc.2021-12-312026-08-2844,494$25,259,244None
Advisors Asset Management, Inc.2022-12-312026-08-2831,640$14,443,660None
Advisors Asset Management, Inc.2020-06-302026-08-288$2,426None
Advisors Asset Management, Inc.2020-06-302026-08-2866,475$20,155,885None
Advisors Asset Management, Inc.2022-06-302026-08-2842,283$20,265,000None
Advisors Asset Management, Inc.2021-09-302026-08-2841,994$18,870,000None
Corient Private Wealth LP2026-06-302026-08-289,712$9,085,785None
Corient Private Wealth LP2026-06-302026-08-28744,994$696,921,783None
Redwood Investment Management, LLC2024-12-312026-08-281,603$1,469,000None
Redwood Investment Management, LLC2025-03-312026-08-282,228$2,107,000None
BOSTON RESEARCH & MANAGEMENT INC2025-12-312026-08-28290$250,079None
Formuepleje A/S2026-06-302026-08-282,237$2,092,646None
Wellington Grp LLC2026-06-302026-08-27456$426,609None
Reflection Asset Management2026-03-312026-08-273,217$3,205,515None
Legacy Edge Advisors, LLC2025-09-302026-08-272,010$1,860,731None
HORAN Wealth, LLC2026-06-302026-08-27830$776,720None
Principia Wealth Advisory, LLC2026-06-302026-08-2739$36,483None
Principia Wealth Advisory, LLC2026-03-312026-08-2730$29,893None
Brown Financial Advisors2026-06-302026-08-271,177$1,100,580None
Schulz Wealth, LTD.2026-06-302026-08-27328$306,834None
Advisors Asset Management, Inc.2024-03-312026-08-2723,114$16,934,010None
Advisors Asset Management, Inc.2025-03-312026-08-2729,158$27,577,053None
Advisors Asset Management, Inc.2022-09-302026-08-2738,201$18,041,000None
Advisors Asset Management, Inc.2020-12-312026-08-2754,145$20,401,000None
Advisors Asset Management, Inc.2022-03-312026-08-2745,417$26,153,379None
Advisors Asset Management, Inc.2023-06-302026-08-2722,358$12,037,100None
Advisors Asset Management, Inc.2023-09-302026-08-2722,071$12,469,232None
Advisors Asset Management, Inc.2023-03-312026-08-2726,168$13,002,094None
Advisors Asset Management, Inc.2021-03-312026-08-2750,143$17,674,405None
Advisors Asset Management, Inc.2021-06-302026-08-2744,653$17,668,000None
Advisors Asset Management, Inc.2020-09-302026-08-2760,845$21,599,975None
Advisors Asset Management, Inc.2025-09-302026-08-2732,873$30,428,235None
Advisors Asset Management, Inc.2023-12-312026-08-2721,632$14,278,851None
WILLIAM JOHN SEMPOLINSKI2026-03-312026-08-27350$348,751None
WILLIAM JOHN SEMPOLINSKI2025-12-312026-08-27300$258,702None
Dakota Wealth Management2025-09-302026-08-2753,103$49,153,670None
Dakota Wealth Management2025-12-312026-08-2751,046$44,018,947None
Dakota Wealth Management2026-03-312026-08-2753,836$53,643,938None
Redwood Investment Management, LLC2025-06-302026-08-271,827$1,809,000None
Redwood Investment Management, LLC2025-09-302026-08-271,908$1,766,000None
Redwood Investment Management, LLC2025-12-312026-08-271,992$1,718,000None
BOSTON RESEARCH & MANAGEMENT INC2026-03-312026-08-27290$288,965None
Advus Financial Partners, LLC2026-06-302026-08-26611$572,011None

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

Recent Congressional disclosures

Show the table · 3 rows, 5 columns

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Pete Sessions2026-10-272026-10-02sale$250,001 - $500,000
Pete Sessions2026-10-272026-10-13sale$100,001 - $250,000
Rick W. Allen2026-10-142026-09-18sale$1,001 - $15,000

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.