Insider Buying Report: August 2026

Every open-market insider purchase disclosed to the SEC in August 2026, with executive buying kept separate from fund and 10%-owner flows.

Data as of Oct 22 · Source: SEC EDGAR

Executive buying

$271.1M

officers + directors · 1.2K buys

10%-owner & institutional

$1.7B

funds, PE, IPO/financing

Companies bought

459

by executives

Executives buying

745

distinct individuals

August 2026 in one paragraph

In August 2026, 745 U.S. company officers and directors bought $271.1M of their own stock on the open market, across 459 companies. Separately, 10%-owners and institutions filed $1.7B, largely IPO and financing positions rather than open-market conviction.

As of Oct 22. Source: Tracefour, SEC EDGAR Form 4 filings.

Biggest executive buys · August 2026

  1. 1ETWARREN KELCY L$13.8M
  2. 2BABATsai Joseph C$10.4M
  3. 3BABATsai Joseph C$10.3M
  4. 4INTCTAN LIP BU$10.0M
  5. 5KLARSiemiatkowski Sebastian$9.9M
  6. 6BSXMahoney Michael F$9.0M
  7. 7ETWARREN KELCY L$7.5M
  8. 8BORRTroim Tor Olav$6.0M
  9. 9GWRSLevine Jonathan L$5.8M
  10. 10NGLRAYMOND JOHN T$5.1M

Most-bought by executives · August 2026

  1. 1BABAAlibaba Group Holding Ltd2 buyers$25.7M
  2. 2ETEnergy Transfer LP2 buyers$21.5M
  3. 3INTCINTEL CORP1 buyer$10.0M
  4. 4KLARKlarna Group plc1 buyer$9.9M
  5. 5BORRBorr Drilling Ltd2 buyers$9.6M
  6. 6BSXBOSTON SCIENTIFIC CORP4 buyers$9.5M
  7. 7CDNLCardinal Infrastructure Group Inc.7 buyers$8.5M
  8. 8AMRAlpha Metallurgical Resources, Inc.1 buyer$8.3M
  9. 9APTVAptiv PLC4 buyers$8.3M
  10. 10APLMApollomics Inc.3 buyers$8.3M

Biggest 10%-owner & institutional buys · August 2026

Funds, PE and strategic holders. These are often IPO or private-placement positions, not open-market conviction.

  1. 1JEFSUMITOMO MITSUI FINANCIAL GROUP, INC.$324.0M
  2. 2MAIRBERTARELLI ERNESTO$219.0M
  3. 3RSGCASCADE INVESTMENT, L.L.C.$51.8M
  4. 4RSGCASCADE INVESTMENT, L.L.C.$48.4M
  5. 5RSGCASCADE INVESTMENT, L.L.C.$46.7M
  6. 6RSGCASCADE INVESTMENT, L.L.C.$45.8M
  7. 7RSGCASCADE INVESTMENT, L.L.C.$40.0M
  8. 8RSGCASCADE INVESTMENT, L.L.C.$36.4M
  9. 9RSGCASCADE INVESTMENT, L.L.C.$35.7M
  10. 10BRVEForbion Growth Opportunities Fund III Cooperatief U.A.$34.6M

How August 2026's buys have played out

Price change from each trade to the most recent close, for the month's largest executive buys and sells.

Executives bought

-8.2% median since

27 stocks · 26% now higher

Executives sold

-4.2% median since

20 stocks · 45% now higher

Gained since the buy
  • DINOHF Sinclair Corp
    Bought ~$85.55 (Aug 11)→ $125.57
    +46.8%
  • CSGPCOSTAR GROUP, INC.
    Bought ~$29.82 (Aug 4)→ $35.45
    +18.9%
  • DKSDICK'S SPORTING GOODS, INC.
    Bought ~$131.77 (Aug 27)→ $148.78
    +12.9%
  • SGISOMNIGROUP INTERNATIONAL INC.
    Bought ~$62.48 (Aug 27)→ $65.99
    +5.6%
  • ONONOn Holding AG
    Bought ~$32.22 (Aug 14)→ $34.00
    +5.5%
Fell since the buy
  • CDNLCardinal Infrastructure Group Inc.
    Bought ~$39.42 (Aug 14)→ $14.64
    -62.9%
  • CCHHCCH Holdings Ltd
    Bought ~$1.37 (Jul 24)→ $0.90
    -34.5%
  • TTMITTM TECHNOLOGIES INC
    Bought ~$112.30 (Aug 25)→ $73.89
    -34.2%
  • BRVEBraveheart Bio, Inc.
    Bought ~$30.00 (Aug 7)→ $21.04
    -29.9%
  • AMRAlpha Metallurgical Resources, Inc.
    Bought ~$210.01 (Aug 21)→ $159.39
    -24.1%

Price change from the market close on the disclosed trade date to the most recent close. Stocks that split in between are excluded. Cohort figures are medians across the month's largest trades (small sample). Historical price movement only, not a prediction, signal, or recommendation.

Repeat buyers of August 2026

Executives who made two or more open-market buys of $100K+ during August 2026, ranked by the median price change since each buy. Every name links to their full filing history.

Strongest track records
Weakest track records

Median price change from each buy's trade-date close to the most recent close. Buys under 7 days old and stocks that split in between are excluded. A track record is past filings and price history, not a prediction of an insider's future trades or of stock performance.

Cite this report

U.S. company officers and directors bought $271.1M of their own companies' stock across 459 companies in August 2026, according to SEC Form 4 filings aggregated by Tracefour.

Method: open-market purchases (code P) by officers and directors, one row per economic trade, from public EDGAR filings. Source link for attribution: https://tracefour.com/insider-trading-statistics/2026-08

Questions & answers

How much stock did company insiders buy in August 2026?
In August 2026, U.S. company officers and directors bought $271.1M of their own companies' stock on the open market, across 459 companies. A further $1.7B was filed by 10%-owners and institutions, largely IPO and financing positions rather than open-market conviction buys.
What was the biggest insider buy in August 2026?
The largest open-market executive purchase disclosed in August 2026 was WARREN KELCY L's $13.8M buy of ET (Energy Transfer LP), filed with the SEC on Form 4.
Which sectors did executives buy the most in August 2026?
The most executive buying in August 2026 by dollar value was in Energy: $47.8M, about 18% of the month's executive purchases.
Does a stock go up after insiders buy it?
Not reliably. Insider buying is one public data point, not a forecast. Historically some stocks rise after insider purchases and others fall. Tracefour shows what was filed and how prices have moved since. It does not predict prices or give investment advice.
Data sourced from public SEC EDGAR Form 4 filings. Not investment advice.