Costco Wholesale (COST): Congress and insider trades
Who in Congress and inside the company traded COST, when each filing appeared, and what buying after each one would have earned against the S&P 500.
Key Facts
- Costco Wholesale (COST) is a listed stock on NASDAQ.
- 33 members of Congress filed 65 buys and 40 sells of COST, the latest published 2026-09-07 (7 September 2026).
- Insiders filed 0 open market buys worth $0 and 2 sells worth $1.5M, the latest filed 2026-06-25 (25 June 2026).
- Across 46 scored buys, Congress averaged +3.5% against the S&P 500 (SPY) over the 90 days after disclosure, with 63% of them ahead of the index. That result is modestly above the market, but could still be chance.
- Data as of 2026-09-29 (29 September 2026).
Congress buys 65 33 members
Congress sells 40
Insider buys 0 $0
Insider sells 2 $1.5M
Congress buys vs S&P, 90d +3.5% 46 scored buys
Insider buys vs S&P, 90d n/a 0 scored buys
Congress trades in COST
as of 2026-09-07 Showing the latest 100 of 105.
| Filed | Member | Type | Size | Days to file | 90 day vs S&P |
|---|---|---|---|---|---|
| 7 Sep 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 11 | n/a |
| 17 Aug 2026 | Rich McCormick (R-GA) | sell | 1K–15K | 15 | n/a |
| 12 Aug 2026 | Ro Khanna (D-CA) | sell | 50K–100K | 18 | n/a |
| 21 Jul 2026 | Alan Armstrong (R-OK) | buy | 1K–15K | 116 | n/a |
| 20 Jul 2026 | Dan Newhouse (R-WA) | buy | 1K–15K | 7 | n/a |
| 8 Jul 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 34 | n/a |
| 12 Mar 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 13 | -14.8% |
| 16 Feb 2026 | Gil Cisneros (D-CA) | buy | 1K–15K | 14 | -1.9% |
| 16 Jan 2026 | Markwayne Mullin (R-OK) | buy | 15K–50K | 18 | -1.3% |
| 13 Jan 2026 | Gil Cisneros (D-CA) | sell | 1K–15K | 19 | n/a |
| 10 Dec 2025 | Rich McCormick (R-GA) | buy | 1K–15K | 34 | +13.9% |
| 15 May 2025 | Ro Khanna (D-CA) | buy | 1K–15K | 33 | -13.6% |
| 13 May 2025 | Bruce Westerman (R-AR) | sell | 1K–15K | 21 | n/a |
| 10 Nov 2023 | Ro Khanna (D-CA) | sell | 15K–50K | 8 | n/a |
| 10 Nov 2023 | Ro Khanna (D-CA) | buy | 15K–50K | 29 | +13.8% |
| 9 Nov 2023 | Greg Stanton (D-AZ) | buy | 1K–15K | 44 | +15.0% |
| 9 Nov 2023 | Greg Stanton (D-AZ) | sell | 1K–15K | 16 | n/a |
| 1 Nov 2023 | Markwayne Mullin (R-OK) | buy | 1K–15K | 29 | +15.3% |
| 12 Oct 2023 | Markwayne Mullin (R-OK) | buy | 15K–50K | 24 | +10.9% |
| 22 Sep 2023 | Dan Sullivan (R-AK) | sell | 1K–15K | 31 | n/a |
| 7 Sep 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 34 | +7.8% |
| 9 Aug 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 10 | +3.0% |
| 12 Jul 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 12 | +7.8% |
| 12 Jul 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 15 | +7.8% |
| 14 Jun 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 20 | +4.7% |
| 14 Jun 2023 | Ro Khanna (D-CA) | sell | 1K–15K | 20 | n/a |
| 7 Jun 2023 | Zoe Lofgren (D-CA) | sell | 1K–15K | 12 | n/a |
| 29 May 2023 | Rick Larsen (D-WA) | buy | 1K–15K | 786 | 0.0% |
| 24 May 2023 | Scott Franklin (R-FL) | buy | 1K–15K | 34 | +3.9% |
| 24 May 2023 | Scott Franklin (R-FL) | buy | 50K–100K | 34 | +3.9% |
| 10 May 2023 | Ro Khanna (D-CA) | sell | 15K–50K | 28 | n/a |
| 14 Mar 2023 | John Curtis (R-UT) | sell | 1K–15K | 18 | n/a |
| 13 Mar 2023 | Jared Moskowitz (D-FL) | buy | 1K–15K | 17 | -2.8% |
| 10 Mar 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 26 | -2.2% |
| 27 Feb 2023 | Daniel S. Goldman (D-NY) | sell | 15K–50K | 24 | n/a |
| 15 Feb 2023 | Kevin Hern (R-OK) | sell | 1K–15K | 14 | n/a |
| 9 Feb 2023 | Ro Khanna (D-CA) | sell | 15K–50K | 29 | n/a |
| 9 Feb 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 33 | -0.8% |
| 9 Feb 2023 | Ro Khanna (D-CA) | buy | 15K–50K | 27 | -0.8% |
| 4 Jan 2023 | Ro Khanna (D-CA) | sell | 1K–15K | 29 | n/a |
| 4 Jan 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 28 | +2.8% |
| 20 Dec 2022 | Ed Perlmutter (D-CO) | buy | 1K–15K | 39 | +2.7% |
| 7 Dec 2022 | Ro Khanna (D-CA) | sell | 15K–50K | 34 | n/a |
| 7 Dec 2022 | Ro Khanna (D-CA) | buy | 15K–50K | 33 | 0.0% |
| 17 Nov 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 20 | n/a |
| 17 Nov 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 35 | -7.1% |
| 17 Nov 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 35 | -7.1% |
| 17 Nov 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 21 | n/a |
| 11 Nov 2022 | Kathy Manning (D-NC) | sell | 1K–15K | 29 | n/a |
| 12 Oct 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 8 | n/a |
| 15 Sep 2022 | Kathy Manning (D-NC) | buy | 1K–15K | 40 | -8.9% |
| 12 Aug 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 22 | +1.3% |
| 12 Aug 2022 | Ro Khanna (D-CA) | buy | 50K–100K | 21 | +1.3% |
| 11 Aug 2022 | Kathy Manning (D-NC) | buy | 1K–15K | 26 | +2.9% |
| 10 Aug 2022 | Shelley Moore Capito (R-WV) | buy | 1K–15K | 40 | +2.8% |
| 4 Aug 2022 | David McKinley (R-WV) | sell | 1K–15K | 27 | n/a |
| 21 Jun 2022 | Marjorie Taylor Greene (R-GA) | buy | 15K–50K | 10 | +5.8% |
| 15 Jun 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 31 | +4.6% |
| 15 Jun 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 36 | n/a |
| 15 Jun 2022 | Ro Khanna (D-CA) | sell | 15K–50K | 18 | n/a |
| 11 May 2022 | Ed Perlmutter (D-CO) | sell | 1K–15K | 18 | n/a |
| 11 Mar 2022 | Ro Khanna (D-CA) | buy | 15K–50K | 19 | -5.5% |
| 4 Mar 2022 | Don Beyer (D-VA) | sell | 15K–50K | 3 | n/a |
| 4 Mar 2022 | Kurt Schrader (D-OR) | buy | 1K–15K | 2 | -7.9% |
| 14 Feb 2022 | Pete Sessions (R-TX) | sell | 1K–15K | 87 | n/a |
| 9 Feb 2022 | Ro Khanna (D-CA) | sell | 15K–50K | 18 | n/a |
| 1 Feb 2022 | Don Beyer (D-VA) | buy | 1K–15K | 1 | +10.2% |
| 10 Jan 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 24 | +18.2% |
| 23 Dec 2021 | Ed Perlmutter (D-CO) | sell | 1K–15K | 26 | n/a |
| 8 Dec 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 28 | +8.8% |
| 19 Nov 2021 | Kim Schrier (D-WA) | sell | 15K–50K | 21 | n/a |
| 10 Nov 2021 | Ro Khanna (D-CA) | sell | 50K–100K | 33 | n/a |
| 10 Nov 2021 | Ro Khanna (D-CA) | sell | 1K–15K | 13 | n/a |
| 15 Oct 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 16 | +4.8% |
| 8 Oct 2021 | Zoe Lofgren (D-CA) | buy | 1K–15K | 35 | +11.8% |
| 2 Oct 2021 | Don Beyer (D-VA) | buy | 1K–15K | 14 | +18.0% |
| 16 Sep 2021 | Ro Khanna (D-CA) | buy | 50K–100K | 29 | +14.8% |
| 16 Sep 2021 | Kevin Hern (R-OK) | buy | 250K–500K | 21 | +14.8% |
| 16 Sep 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 30 | +14.8% |
| 16 Sep 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 40 | +14.8% |
| 16 Sep 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 43 | +14.8% |
| 11 Sep 2021 | Fred Upton (R-MI) | buy | 15K–50K | 21 | +16.0% |
| 11 Sep 2021 | Fred Upton (R-MI) | buy | 15K–50K | 21 | +16.0% |
| 9 Sep 2021 | Marie Newman (D-IL) | sell | 15K–50K | 40 | n/a |
| 6 Aug 2021 | Marie Newman (D-IL) | buy | 15K–50K | 23 | +10.4% |
| 5 Aug 2021 | Marjorie Taylor Greene (R-GA) | buy | 1K–15K | 16 | +11.6% |
| 2 Apr 2021 | Don Beyer (D-VA) | sell | 1K–15K | 14 | n/a |
| 17 Mar 2021 | Peter Meijer (R-MI) | sell | 15K–50K | 28 | n/a |
| 2 Mar 2021 | David McKinley (R-WV) | buy | 1K–15K | 7 | +6.6% |
| 20 Feb 2021 | John Yarmuth (D-KY) | sell | 1K–15K | 22 | n/a |
| 9 Feb 2021 | Jerry Moran (R-KS) | sell | 1K–15K | 12 | n/a |
| 9 Feb 2021 | Jerry Moran (R-KS) | sell | 1K–15K | 12 | n/a |
| 16 Jan 2021 | Phil Roe (R-TN) | buy | 1K–15K | 15 | -5.6% |
| 16 Jan 2021 | Phil Roe (R-TN) | buy | 1K–15K | 18 | -5.6% |
| 15 Jan 2021 | Pat Roberts (R-KS) | buy | 15K–50K | 51 | -5.6% |
| 15 Jan 2021 | Pat Roberts (R-KS) | sell | 15K–50K | 71 | n/a |
| 12 Jan 2021 | Gil Cisneros (D-CA) | buy | 1K–15K | 11 | -9.3% |
| 12 Jan 2021 | Gil Cisneros (D-CA) | buy | 1K–15K | 19 | -9.3% |
| 1 Jan 2021 | Pat Roberts (R-KS) | buy | 15K–50K | 9 | -15.4% |
| 29 Dec 2020 | Katherine Clark (D-MA) | sell | 1K–15K | 53 | n/a |
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Insider trades in COST
as of 2026-06-25| Filed | Insider | Type | Shares | Price | Value | 90 day vs S&P |
|---|---|---|---|---|---|---|
| 25 Jun 2026 | DENMAN KENNETH D | sell | 885 | $957.45 | $847K | n/a |
| 1 Apr 2026 | Frates Caton | sell | 700 | $993.00 | $695K | n/a |
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Related pages
Frequently asked questions
Who has bought COST?
65 Congress buys by 33 members and 0 insider buys are on file. The tables on this page list every one.
Did buying COST after a disclosure beat the market?
Across 46 scored buys, Congress averaged +3.5% against the S&P 500 (SPY) over the 90 days after disclosure, with 63% of them ahead of the index. That result is modestly above the market, but could still be chance. A single stock is a small sample.
Sources: Congressional trades: STOCK Act disclosures, collected from CapitolTrades. Insider trades: SEC Form 4 filings, collected from Finviz. Prices: Yahoo Finance daily adjusted closes. Data as of 2026-09-29 (29 September 2026). About these sources.
Not investment advice. Past disclosed trades do not predict future returns. Disclosures are published late, so the trades shown are ones you could only have copied after the fact. Talk to a licensed adviser before you invest.