What the executives and directors of Costco actually did with their own shares, decoded from three years of SEC Form 4 filings.
The tape: three years of insider trades
Every marker sits at the exact price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the gray strip is routine flow (vestings, tax withholding, gifts) that headlines love to miscount as selling.
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
Skin in the game
Directly held shares as reported after each trade, indexed to 100 five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
Who holds what
| Insider | Role | Shares held | Buys 12 m | Sales 12 m |
|---|---|---|---|---|
| JELINEK W CRAIG | Director | 204.4K | — | — |
| MUNGER CHARLES T | Director | 168.1K | — | — |
| Callans Patrick J Executive Vice President | Officer | 61.6K | — | — |
| JAMES HAMILTON E | Director | 56K | — | — |
| Vachris Roland Michael President and CEO | CEO | 54.9K | — | — |
| Sullivan John Christopher Executive VP | Officer | 50.2K | — | — |
| Klauer James C Executive Vice President | Officer | 44.9K | — | $1.4M |
| GALANTI RICHARD A Executive Vice President | Officer | 34.4K | — | — |
| STANTON JOHN W | Director | 24.3K | — | — |
| MILLERCHIP GARY Executive Vice President | Officer | 15.5K | — | — |
| Hines Daniel M. | Other | 13.1K | — | — |
| Riel Pierre Executive Vice President | Officer | 12.9K | — | — |
| POLIT JAVIER Executive Vice President | Officer | 10.2K | — | $2.3M |
| Rubanenko Yoram Executive Vice President | Officer | 9,993 | — | — |
Open-market trade log
| Date | Insider | Type | Shares | Price | Value |
|---|---|---|---|---|---|
| 2026-06-23 | DENMAN KENNETH D (Director) | Discretionary sale | 885 | $957.45 | $847K |
| 2026-04-01 | Frates Caton (Officer) | Discretionary sale | 700 | $993.00 | $695K |
| 2026-03-09 | Adamo Claudine (Officer) | Discretionary sale | 730 | $1003.02 | $732K |
| 2026-01-21 | Jones Teresa A. (Officer) | Discretionary sale | 850 | $986.26 | $838K |
| 2026-01-16 | DECKER SUSAN L (Director) | Discretionary sale | 458 | $955.00 | $437K |
| 2026-01-14 | Klauer James C (Officer) | Discretionary sale | 1,500 | $939.00 | $1.4M |
| 2026-01-09 | Miller Russell D (Officer) | Discretionary sale | 1,500 | $916.32 | $1.4M |
| 2025-12-30 | POLIT JAVIER (Officer) | Discretionary sale | 558 | $862.90 | $482K |
| 2025-12-29 | POLIT JAVIER (Officer) | Discretionary sale | 2,049 | $867.21 | $1.8M |
| 2025-11-07 | Wilcox William Richard (Officer) | Discretionary sale | 2,400 | $930.13 | $2.2M |
| 2025-10-24 | Adamo Claudine (Officer) | Discretionary sale | 2,700 | $935.68 | $2.5M |
| 2025-10-24 | Barbre Tiffany Marie (Other) | Discretionary sale | 1,239 | $934.62 | $1.2M |
| 2025-09-29 | Miller Russell D (Officer) | Discretionary sale | 3,381 | $915.00 | $3.1M |
| 2025-09-29 | Frates Caton (Officer) | Discretionary sale | 1,540 | $910.02 | $1.4M |
| 2025-08-20 | Jones Teresa A. (Officer) | Discretionary sale | 600 | $992.05 | $595K |
| 2025-07-14 | Rubanenko Yoram (Officer) | Discretionary sale | 4,000 | $974.96 | $3.9M |
| 2025-06-18 | DECKER SUSAN L (Director) | Discretionary sale | 1 | $978.40 | $978 |
| 2025-06-18 | DECKER SUSAN L (Director) | Discretionary sale | 546 | $980.00 | $535K |
| 2025-06-09 | Callans Patrick J (Officer) | Discretionary sale | 3,000 | $1002.77 | $3M |
| 2025-06-06 | Riel Pierre (Officer) | Discretionary sale | 2,000 | $1014.15 | $2M |
| 2025-04-17 | Klauer James C (Officer) | Discretionary sale | 4,000 | $981.07 | $3.9M |
| 2025-03-27 | MILLERCHIP GARY (Officer) | Discretionary sale | 1,100 | $940.01 | $1M |
| 2025-03-24 | Adamo Claudine (Officer) | Discretionary sale | 900 | $922.56 | $830K |
| 2025-03-18 | Frates Caton (Officer) | Discretionary sale | 850 | $900.25 | $765K |
| 2025-03-11 | Vachris Roland Michael (CEO) | Discretionary sale | 3,600 | $931.00 | $3.4M |
| 2024-10-24 | GALANTI RICHARD A (Officer) | Discretionary sale | 1,416 | $894.68 | $1.3M |
| 2024-10-23 | Jones Teresa A. (Officer) | Discretionary sale | 800 | $896.55 | $717K |
| 2024-10-15 | Riel Pierre (Officer) | Discretionary sale | 2,000 | $896.71 | $1.8M |
| 2024-10-11 | Miller Russell D (Officer) | Discretionary sale | 4,400 | $891.15 | $3.9M |
| 2024-09-30 | Callans Patrick J (Officer) | Discretionary sale | 2,500 | $893.94 | $2.2M |
| 2024-09-30 | Adamo Claudine (Officer) | Discretionary sale | 3,200 | $888.99 | $2.8M |
| 2024-09-30 | Frates Caton (Officer) | Discretionary sale | 1,700 | $883.35 | $1.5M |
| 2024-08-15 | GALANTI RICHARD A (Officer) | Discretionary sale | 500 | $874.05 | $437K |
| 2024-08-15 | DECKER SUSAN L (Director) | Discretionary sale | 620 | $876.50 | $543K |
| 2024-08-13 | GALANTI RICHARD A (Officer) | Discretionary sale | 500 | $863.88 | $432K |
| 2024-07-25 | Jones Teresa A. (Officer) | Discretionary sale | 4 | $832.55 | $3K |
| 2024-07-15 | DENMAN KENNETH D (Director) | Discretionary sale | 350 | $851.53 | $298K |
| 2024-07-15 | Hines Daniel M. (Other) | Discretionary sale | 1,500 | $848.53 | $1.3M |
| 2024-07-12 | Hines Daniel M. (Other) | Discretionary sale | 1,500 | $844.20 | $1.3M |
| 2024-04-17 | Miller Russell D (Officer) | Discretionary sale | 785 | $722.86 | $567K |
| 2024-03-11 | Callans Patrick J (Officer) | Discretionary sale | 2,500 | $714.86 | $1.8M |
| 2024-03-11 | Adamo Claudine (Officer) | Discretionary sale | 1,500 | $714.83 | $1.1M |
| 2024-02-09 | DECKER SUSAN L (Director) | Discretionary sale | 1,442 | $723.48 | $1M |
| 2024-01-23 | JELINEK W CRAIG (Director) | Discretionary sale | 8,000 | $685.93 | $5.5M |
| 2024-01-18 | Rubanenko Yoram (Officer) | Discretionary sale | 2,500 | $680.33 | $1.7M |
| 2024-01-16 | Frates Caton (Officer) | Discretionary sale | 740 | $683.50 | $506K |
| 2024-01-09 | Hines Daniel M. (Other) | Discretionary sale | 1,400 | $662.30 | $927K |
| 2023-12-28 | Hines Daniel M. (Other) | Discretionary sale | 1,400 | $662.81 | $928K |
| 2023-12-19 | GALANTI RICHARD A (CFO) | Discretionary sale | 1,112 | $680.21 | $756K |
| 2023-11-08 | GALANTI RICHARD A (CFO) | Discretionary sale | 1,000 | $564.88 | $565K |
| 2023-11-08 | GALANTI RICHARD A (CFO) | Discretionary sale | 1,000 | $567.30 | $567K |
| 2023-11-07 | Riel Pierre (Officer) | Discretionary sale | 3,000 | $571.12 | $1.7M |
| 2023-11-03 | Miller Russell D (Officer) | Discretionary sale | 4,500 | $557.75 | $2.5M |
| 2023-10-23 | Adamo Claudine (Officer) | Discretionary sale | 2,565 | $548.92 | $1.4M |
| 2023-10-11 | Klauer James C (Officer) | Discretionary sale | 1,500 | $562.01 | $843K |
| 2023-10-10 | GALANTI RICHARD A (CFO) | Discretionary sale | 2,000 | $565.57 | $1.1M |
| 2023-10-09 | Callans Patrick J (Officer) | Discretionary sale | 2,500 | $553.76 | $1.4M |
| 2023-10-06 | Frates Caton (Officer) | Discretionary sale | 1,200 | $562.64 | $675K |
| 2023-06-28 | DECKER SUSAN L (Director) | Discretionary sale | 1,565 | $533.00 | $834K |
| 2023-06-13 | GALANTI RICHARD A (CFO) | Discretionary sale | 1,500 | $522.03 | $783K |
“Since trade” compares with the latest insider-implied price, not a market quote; this site carries no market data by design.
Filing hygiene
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.