Insider Selling on September 21, 2026: BZ, DELL and ANET Lead $601.4M of Sales

Company insiders filed 103 open-market sales worth $601.4M with the SEC on September 21, 2026, across 74 companies. 54 of them (52%) were made under Rule 10b5-1 plans set up months in advance, which makes a sale less telling. Below are the largest, with what each insider owns now, how the stock has moved since, and each company's insider trading over the past 90 days.

The 15 largest insider sales filed Sep 21

Unscheduled sales

The largest sales made outside Rule 10b5-1 plans by officers and directors rather than 10% owners. These are the sales worth reading.

• Lynch James F (Director) at GSAT sold 361,600 shares at $82.52 ($29.8M), cutting their holding 51%.
• Kennedy David Alan (Chief Financial Officer) at DELL sold 23,896 shares at $585.02 ($14.0M), cutting their holding 13%.
• Goetz James J (Director) at PANW sold 20,000 shares at $376.68 ($7.5M), their entire reported stake.
• Davis Cary (Director) at CRWD sold 29,940 shares at $246.00 ($7.4M), cutting their holding 34%.
• Schikan Johannes Gerardus Christiaan Petrus (Director) at PHVS sold 200,000 shares at $35.00 ($7.0M), cutting their holding 63%.
• Mullen John P (President) at GWRE sold 39,683 shares at $144.47 ($5.7M), cutting their holding 18%.
• Adcock Mary Ellen (Executive Vice President) at KR sold 72,901 shares at $60.70 ($4.4M), cutting their holding 29%.
• Lu Peng (President) at PHVS sold 100,000 shares at $35.00 ($3.5M), cutting their holding 61%.

Biggest stake cuts

The sales that shrank an insider's holding the most, in percent.

• Goetz James J (Director) at PANW sold 20,000 shares at $376.68 ($7.5M), their entire reported stake.
• Boroditsky Marc (Chief Revenue Officer) at NBIS sold 26,886 shares at $205.87 ($5.5M), their entire reported stake.
• Thayer Jonathan W (Chief Financial Officer) at VG sold 222,222 shares at $14.31 ($3.2M), their entire reported stake.
• Silver Lake Technology Investors IV, L.P. (Director, 10% Owner) at DELL sold 1,036 shares at $585.92 ($607K), their entire reported stake.
• Silver Lake Technology Investors V, L.P. (Director, 10% Owner) at DELL sold 468 shares at $585.90 ($274K), their entire reported stake.
• Kuzoyan Vahe (President, Director) at TTAN sold 3,148 shares at $57.07 ($180K), cutting their holding 100%.

Kanzhun Ltd (BZ)

Zhao Peng Jonathan (Chief Executive Officer, Director, 10% Owner) sold 15,170,000 shares on Sep 21 at an average $7.25, about $110.0M. That cut their holding 12.0%, leaving 110,996,801 shares. Read the Form 4.

BZ last closed at $16.28 on Oct 29, +124.6% from the average sale price. Since Aug 1, Kanzhun Ltd insiders filed 0 open-market purchases ($0) and 5 sales ($121.6M). 21 13F filers hold BZ among their 50 largest positions.

Who traded BZ since Aug 1:

• Zhao Peng Jonathan (Chief Executive Officer, Director, 10% Owner): 2 sales of 15,913,600 shares, about $116.1M
• Chen Xu (Chief Marketing Officer, Director): 2 sales of 600,000 shares, about $5.0M
• Mu Yang (Director): 1 sale of 60,704 shares, about $453K

See every BZ insider trade.

Dell Technologies Inc. (DELL)

Silver Lake Partners IV, L.P. (Director, 10% Owner) sold 52,488 shares starting Sep 17 at an average $585.77, about $30.7M. That cut their holding 3.7%, leaving 1,383,800 shares. Read the Form 4.

Sl Spv-2, L.P. (Director, 10% Owner) sold 46,253 shares starting Sep 17 at an average $585.91, about $27.1M. That cut their holding 28.7%, leaving 114,714 shares. Read the Form 4.

Silver Lake Partners V DE (AIV), L.P. (Director, 10% Owner) sold 26,553 shares starting Sep 17 at an average $585.91, about $15.6M. That cut their holding 30.9%, leaving 59,331 shares. Read the Form 4.

4 more insider filings for DELL came in the same day.

DELL last closed at $475.51 on Oct 29, -18.8% from the average sale price. Since Aug 1, Dell Technologies Inc. insiders filed 0 open-market purchases ($0) and 58 sales ($874.2M). 414 13F filers hold DELL among their 50 largest positions, including Arnold Van Den Berg, Jim Simons and Derek Pilecki. Members of Congress disclosed 11 trades in DELL over the past year; most recently Alan Armstrong (R-OK) bought $1,001–$15,000 on Mar 27.

Who traded DELL since Aug 1:

• Silver Lake Partners IV, L.P. (Director, 10% Owner): 11 sales of 652,708 shares, about $351.5M
• Sl Spv-2, L.P. (Director, 10% Owner): 10 sales of 536,699 shares, about $289.4M
• Silver Lake Partners V DE (AIV), L.P. (Director, 10% Owner): 10 sales of 308,296 shares, about $166.2M
• Trizzino Peter (President, Global Sales): 1 sale of 37,735 shares, about $21.1M
• Kennedy David Alan (Chief Financial Officer): 1 sale of 23,896 shares, about $14.0M
• Saavedra Jennifer D. (Chief Human Resources Officer): 1 sale of 25,251 shares, about $13.1M
• Silver Lake Technology Investors IV, L.P. (Director, 10% Owner): 10 sales of 12,022 shares, about $6.5M
• Rothberg Richard J (General Counsel & Secretary): 2 sales of 10,000 shares, about $5.6M

See every DELL insider trade and which funds own DELL.

Arista Networks, Inc. (ANET)

Bechtolsheim Andreas (10% Owner) sold 300,000 shares starting Sep 17 at an average $198.95, about $59.7M. That cut their holding 0.2%, leaving 180,543,048 shares. The trade was made under a Rule 10b5-1 plan set up in advance. Read the Form 4.

ANET last closed at $184.22 on Oct 29, -7.4% from the average sale price. Since Aug 1, Arista Networks, Inc. insiders filed 0 open-market purchases ($0) and 14 sales ($614.8M). 495 13F filers hold ANET among their 50 largest positions, including Francois Rochon, Steve Cohen and Cliff Asness. Members of Congress disclosed 11 trades in ANET over the past year; most recently Alan Armstrong (R-OK) bought $1,001–$15,000 on Mar 27.

Who traded ANET since Aug 1:

• Ullal Jayshree (CEO and Chairperson, Director): 5 sales of 1,686,813 shares, about $343.3M
• Bechtolsheim Andreas (10% Owner): 4 sales of 1,311,848 shares, about $260.8M
• Duda Kenneth (President and CTO, Director): 1 sale of 43,333 shares, about $8.0M
• Giancarlo Charles H (Director): 1 sale of 8,000 shares, about $1.4M
• Templeton Mark B (Director): 1 sale of 5,000 shares, about $986K
• Breithaupt Chantelle Yvette (Senior Vice President, CFO): 1 sale of 612 shares, about $120K
• Battles Kelly Bodnar (Director): 1 sale of 422 shares, about $79K

See every ANET insider trade and which funds own ANET.

Twist Bioscience Corp (TWST)

Leproust Emily M. (Chief Executive Officer, Director) sold 356,546 shares starting Sep 17 at an average $157.99, about $56.3M. That cut their holding 36.5%, leaving 620,589 shares. The trade was made under a Rule 10b5-1 plan set up in advance. Read the Form 4.

TWST last closed at $173.45 on Oct 29, +9.8% from the average sale price. Since Aug 1, Twist Bioscience Corp insiders filed 0 open-market purchases ($0) and 24 sales ($98.0M). 26 13F filers hold TWST among their 50 largest positions, including Cathie Wood.

Who traded TWST since Aug 1:

• Leproust Emily M. (Chief Executive Officer, Director): 7 sales of 545,428 shares, about $81.0M
• Finn Patrick John (President and COO): 3 sales of 85,289 shares, about $10.0M
• Cho Dennis (See Remarks): 5 sales of 31,490 shares, about $3.8M
• Chess Robert (Director): 1 sale of 18,417 shares, about $2.0M
• Green Paula (SVP of Human Resources): 3 sales of 3,400 shares, about $397K
• Blake Katryn (Director): 1 sale of 2,240 shares, about $275K
• Laponis Adam (Chief Financial Officer): 1 sale of 1,965 shares, about $273K
• Werner Robert F. (Chief Accounting Officer): 3 sales of 1,928 shares, about $257K

See every TWST insider trade and which funds own TWST.

Sandisk Corp (SNDK)

Goeckeler David (Chairman & CEO, Director) sold 33,841 shares starting Sep 17 at an average $1,574.21, about $53.3M. That cut their holding 8.1%, leaving 382,865 shares. The trade was made under a Rule 10b5-1 plan set up in advance. Read the Form 4.

SNDK last closed at $1,330.05 on Oct 29, -15.5% from the average sale price. Since Aug 1, Sandisk Corp insiders filed 0 open-market purchases ($0) and 8 sales ($120.1M). 463 13F filers hold SNDK among their 50 largest positions, including Leopold Aschenbrenner, Alex Sacerdote and Stanley Druckenmiller. Members of Congress disclosed 7 trades in SNDK over the past year; most recently Alan Armstrong (R-OK) bought $1,001–$15,000 on Mar 27.

Who traded SNDK since Aug 1:

• Goeckeler David (Chairman & CEO, Director): 2 sales of 67,679 shares, about $105.0M
• Ilkbahar Alper (EVP & Chief Technology Officer): 2 sales of 5,112 shares, about $7.9M
• Shek Bernard (Chief Legal Officer & Secty): 3 sales of 3,508 shares, about $5.7M
• Visoso Luis Felipe (EVP & CFO): 1 sale of 1,000 shares, about $1.6M

See every SNDK insider trade and which funds own SNDK.

Globalstar, Inc. (GSAT)

Lynch James F (Director) sold 361,600 shares starting Sep 18 at an average $82.52, about $29.8M. That cut their holding 50.7%, leaving 351,114 shares. Read the Form 4.

GSAT last closed at $83.53 on Oct 29, +1.2% from the average sale price. Since Aug 1, Globalstar, Inc. insiders filed 1 open-market purchase ($29.8M) and 9 sales ($62.7M). 21 13F filers hold GSAT among their 50 largest positions.

Who traded GSAT since Aug 1:

• Lynch James F (Director): 2 sales of 471,600 shares, about $38.8M
• Monroe James III (Director, 10% Owner): 1 purchase of 361,600 shares, about $29.8M
• Taylor Timothy Evan (VP, Finance & Operations, Director): 1 sale of 150,000 shares, about $12.4M
• Wolff Benjamin G (Director): 3 sales of 96,707 shares, about $8.0M
• Clary Rebecca (VP & Chief Financial Officer): 1 sale of 24,100 shares, about $2.0M
• Ponder L Barbee IV (General Counsel): 2 sales of 16,765 shares, about $1.4M

See every GSAT insider trade.

Guidewire Software, Inc. (GWRE)

Rosenbaum Michael George (Chief Executive Officer, Director) sold 73,490 shares starting Sep 17 at an average $144.50, about $10.6M. That cut their holding 20.8%, leaving 279,666 shares. The trade was made under a Rule 10b5-1 plan set up in advance. Read the Form 4.

Mullen John P (President) sold 39,683 shares starting Sep 17 at an average $144.47, about $5.7M. That cut their holding 17.8%, leaving 183,647 shares. Read the Form 4.

Cooper Jeffrey Elliott (Chief Financial Officer) sold 33,175 shares starting Sep 17 at an average $143.92, about $4.8M. That cut their holding 28.0%, leaving 85,420 shares. The trade was made under a Rule 10b5-1 plan set up in advance. Read the Form 4.

2 more insider filings for GWRE came in the same day.

GWRE last closed at $160.07 on Oct 29, +10.9% from the average sale price. Since Aug 1, Guidewire Software, Inc. insiders filed 0 open-market purchases ($0) and 14 sales ($27.9M). 37 13F filers hold GWRE among their 50 largest positions, including Bryan Lawrence and Spencer Waxman.

Who traded GWRE since Aug 1:

• Rosenbaum Michael George (Chief Executive Officer, Director): 8 sales of 81,890 shares, about $12.1M
• Mullen John P (President): 2 sales of 54,083 shares, about $8.4M
• Cooper Jeffrey Elliott (Chief Financial Officer): 1 sale of 33,175 shares, about $4.8M
• King James Winston (Chief Admin Officer, Gen Couns): 1 sale of 13,195 shares, about $1.9M
• Peterson David Franklin (Chief Accounting Officer): 2 sales of 4,405 shares, about $775K

See every GWRE insider trade and which funds own GWRE.

Sionna Therapeutics, Inc. (SION)

Ra Capital Management, L.P. (Director, 10% Owner) sold 3,448,811 shares starting Sep 17 at an average $6.33, about $21.8M. That cut their holding 50.0%, leaving 3,448,812 shares. Read the Form 4.

SION last closed at $4.00 on Oct 29, -36.8% from the average sale price. Since Aug 1, Sionna Therapeutics, Inc. insiders filed 0 open-market purchases ($0) and 1 sale ($21.8M).

See every SION insider trade and which funds own SION.

Every number here comes from the original Form 4 filings. See all of the day's trades in the Sep 21 insider recap, or screen every Form 4 in the insider screener.