Week of Aug 17 – Aug 21, 2026
By Trabud Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Insider buying was led by Sumitomo Mitsui Financial Group's $324 million stake build in Jefferies (JEF) and William Gates III's Cascade Investment adding roughly $160 million in Republic Services (RSG), signaling continued conviction in financials and waste management. On the selling side, a Birkenstock (BIRK) director unloaded $1.1 billion, while Uber (AUR) exited $472 million of Aurora Innovation and Ares Management liquidated $471 million of Savers Value Village (SVV), reflecting major private-equity and strategic shareholder profit-taking. The week's activity shows a clear divergence: strategic and value-oriented buyers concentrated in industrials and finance, while large block sales dominated consumer and tech-adjacent growth names.
- Total bought
- $594.4M
- 10 filings
- Total sold
- $2.9B
- 10 filings
- Companies
- 17
- tracked this week
- Net flow
- −$2.3B
- net selling
Top insider buys
| # | Company | Insider | Shares | Value |
|---|---|---|---|---|
| 1 | JEFJefferies Financial Group Inc. | SUMITOMO MITSUI FINANCIAL GROUP, INC.Director | 5.9M | $324.0M |
| 2 | RSG◇2REPUBLIC SERVICES, INC. | CASCADE INVESTMENT, L.L.C.Other | 379.0K | $83.4M |
| 3 | RSG◇2REPUBLIC SERVICES, INC. | CASCADE INVESTMENT, L.L.C.Other | 356.1K | $76.6M |
| 4 | MPLTMapLight Therapeutics, Inc. | Catalyst4, Inc.Other | 4.4M | $50.1M |
| 5 | ETEnergy Transfer LP | WARREN KELCY LDirector | 1.0M | $21.3M |
| 6 | ZNTLZentalis Pharmaceuticals, Inc. | WALTERS GROUPOther | 4.3M | $15.2M |
| 7 | APLMApollomics Inc. | Hung-Wen ChenCEO | 536.7K | $7.6M |
| 8 | LWAYLifeway Foods, Inc. | Divisadero Street Capital Management, LPOther | 246.6K | $6.1M |
| 9 | GWRSGlobal Water Resources, Inc. | Jonathan L LevineDirector | 651.6K | $5.8M |
| 10 | PAMPampa Energy Inc. | Marcos Marcelo MindlinDirector | 1.3M | $4.3M |
Top insider sells
| # | Company | Insider | Shares | Value |
|---|---|---|---|---|
| 1 | BIRKBirkenstock Holding plc | James Michael ChuDirector | 28.1M | $1.1B |
| 2 | AURAurora Innovation, Inc. | Uber Technologies, IncOther | 72.0M | $471.6M |
| 3 | SVV◇2Savers Value Village, Inc. | ARES MANAGEMENT LLCOther | 23.0M | $235.8M |
| 4 | SVV◇2Savers Value Village, Inc. | Ares Management LLCOther | 23.0M | $235.8M |
| 5 | CHYM◇2Chime Financial, Inc. | DST Global Advisors LtdOther | 4.8M | $156.9M |
| 6 | CHYM◇2Chime Financial, Inc. | DST Global Advisors LtdOther | 4.8M | $156.9M |
| 7 | CBRSCerebras Systems Inc. | Sean LieCTO | 726.5K | $151.1M |
| 8 | ILMNILLUMINA, INC. | Keith A. MeisterDirector | 679.6K | $145.6M |
| 9 | SYKSTRYKER CORP | Ronda E StrykerDirector | 350.0K | $117.8M |
| 10 | SNOWSnowflake Inc. | Frank SlootmanDirector | 300.0K | $97.4M |
Quick Answer
What were the biggest insider trades the week of Aug 17 – Aug 21, 2026?
For the week of Aug 17 – Aug 21, 2026, the biggest buy was $324.0M of JEF by SUMITOMO MITSUI FINANCIAL GROUP, INC.; the biggest sale was $1.1B of BIRK by James Michael Chu.
Source: SEC EDGAR Form 4
Frequently Asked Questions
Which insider bought the most the week of Aug 17 – Aug 21, 2026?
SUMITOMO MITSUI FINANCIAL GROUP, INC. (Director) bought $324.0M of Jefferies Financial Group Inc. (JEF) — the largest insider purchase of the week by dollar value.
Which insider sold the most the week of Aug 17 – Aug 21, 2026?
James Michael Chu (Director) sold $1.1B of Birkenstock Holding plc (BIRK) — the largest insider sale of the week by dollar value.
How are these insider trades ranked?
Trabud ranks each week's SEC Form 4 filings by total transaction dollar value, surfacing the largest open-market insider buys and sells. All data comes directly from official SEC EDGAR filings.
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