Walden C Rhines insider trades: Silvaco Group (SVCO) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Walden reports to the SEC
Open-market buys and sales
40 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Dec 9, 2025 | SVCO | ↑ Buy | 13,100 | $4.01 | $53K | Direct | Dec 9, 2025 (0d) |
| Nov 18, 2025 | SVCO | ↑ Buy | 29,000 | $4.07 | $118K | Direct | Nov 19, 2025 (1d) |
| Nov 17, 2025 | SVCO | ↑ Buy | 11,272 | $3.90 | $44K | Direct | Nov 18, 2025 (1d) |
| Nov 27, 2023 | QRVO | ↑ Buy | 5,000 | $93.19 | $466K | Direct | Nov 28, 2023 (1d) |
| Aug 30, 2021 | QRVO | ↓ Sell | 15,390 | $191.29 | $2.9M | Direct | Aug 31, 2021 (1d) |
| Aug 5, 2016 | QRVO | ↑ Buy | 5,000 | $54.02 | $270K | Direct | Aug 9, 2016 (4d) |
| Oct 12, 2015 | MENT | ↓ Sell | 170,000 | $25.65 | $4.4M | Direct | Oct 13, 2015 (1d) |
| Apr 13, 2015 | MENT | ↓ Sell | 100,000 | $24.71 | $2.5M | Direct | Apr 14, 2015 (1d) |
| Aug 29, 2014 | TQNT | ↓ Sell | 20,000 | $20.61 | $412K | Direct | Sep 3, 2014 (5d) |
| May 23, 2014 | TQNT | ↓ Sell | 70,000 | $15.50 | $1.1M | Direct | May 28, 2014 (5d) |
| May 23, 2014 | TQNT | ↓ Sell | 16,000 | $15.41 | $247K | Indirect By Spouse | May 28, 2014 (5d) |
| May 15, 2014 | TQNT | ↓ Sell | 40,000 | $14.50 | $580K | Direct | May 19, 2014 (4d) |
| May 15, 2014 | TQNT | ↓ Sell | 23,000 | $14.36 | $330K | By The Rhines 2002 Partnership, L.P. | May 19, 2014 (4d) |
| May 15, 2014 | TQNT | ↓ Sell | 22,500 | $14.34 | $323K | By The Rhines 2006 Partnership, L.P. | May 19, 2014 (4d) |
| Jan 10, 2014 | MENT | ↓ Sell | 445,530 | $23.42 | $10.4M | Direct | Jan 10, 2014 (0d) |
| Sep 12, 2013 | MENT | ↓ Sell | 217,953 | $22.82 | $5.0M | Direct | Sep 13, 2013 (1d) |
| Apr 12, 2013 | MENT | ↓ Sell | 174,330 | $17.56 | $3.1M | Direct | Apr 15, 2013 (3d) |
| Nov 9, 2012 | TQNT | ↑ Buy | 50,000 | $4.70 | $235K | Direct | Nov 13, 2012 (4d) |
| Nov 9, 2012 | TQNT | ↑ Buy | 20,000 | $4.70 | $94K | By The Rhines 2006 Partnership, L.P. | Nov 13, 2012 (4d) |
| Nov 9, 2012 | TQNT | ↑ Buy | 20,000 | $4.70 | $94K | By The Rhines 2002 Partnership, L.P. | Nov 13, 2012 (4d) |
| Nov 9, 2012 | TQNT | ↑ Buy | 10,000 | $4.70 | $47K | Indirect By Spouse | Nov 13, 2012 (4d) |
| Sep 6, 2012 | MENT | ↓ Sell | 329,592 | $17.05 | $5.6M | Direct | Sep 7, 2012 (1d) |
| Dec 20, 2011 | MENT | ↓ Sell | 122,816 | $12.75 | $1.6M | Direct | Dec 21, 2011 (1d) |
| Nov 22, 2011 | TQNT | ↑ Buy | 15,000 | $4.25 | $64K | Direct | Nov 22, 2011 (0d) |
| Nov 7, 2011 | TQNT | ↑ Buy | 10,000 | $5.19 | $52K | Direct | Nov 8, 2011 (1d) |
| Nov 7, 2011 | TQNT | ↑ Buy | 3,000 | $5.19 | $16K | By The Rhines 2002 Partnership, L.P. | Nov 8, 2011 (1d) |
| Nov 7, 2011 | TQNT | ↑ Buy | 2,500 | $5.19 | $13K | By The Rhines 2006 Partnership, L.P. | Nov 8, 2011 (1d) |
| Dec 23, 2010 | MENT | ↓ Sell | 7,213 | $12.18 | $88K | Direct | Dec 23, 2010 (0d) |
| Nov 3, 2010 | TQNT | ↓ Sell | 17,500 | $10.15 | $178K | Direct | Nov 5, 2010 (2d) |
| Jun 4, 2010 | TQNT | ↓ Sell | 17,500 | $6.96 | $122K | Direct | Jun 8, 2010 (4d) |
| Aug 27, 2009 | MENT | ↓ Sell | 30,388 | $8.76 | $266K | Direct | Aug 28, 2009 (1d) |
| Mar 11, 2008 | TQNT | ↑ Buy | 50,000 | $4.71 | $235K | Direct | Mar 13, 2008 (2d) |
| Jan 8, 2007 | MENT | ↓ Sell10b5-1 | 100,000 | $18.90 | $1.9M | Direct | Jan 10, 2007 (2d) |
| Oct 25, 2006 | MENT | ↓ Sell10b5-1 | 12,500 | $15.95 | $199K | Direct | Oct 27, 2006 (2d) |
| Oct 23, 2006 | MENT | ↓ Sell10b5-1 | 47,500 | $15.95 | $758K | Direct | Oct 24, 2006 (1d) |
| Oct 16, 2006 | MENT | ↓ Sell10b5-1 | 40,000 | $15.95 | $638K | Direct | Oct 18, 2006 (2d) |
| Sep 14, 2006 | MENT | ↓ Sell | 65,000 | $14.90 | $969K | Direct | Sep 14, 2006 (0d) |
| Aug 30, 2006 | MENT | ↓ Sell | 35,000 | $14.88 | $521K | Direct | Sep 1, 2006 (2d) |
| Aug 16, 2006 | MENT | ↓ Sell | 100,000 | $14.35 | $1.4M | Direct | Aug 18, 2006 (2d) |
| Aug 2, 2006 | MENT | ↓ Sell | 100,000 | $13.80 | $1.4M | Direct | Aug 3, 2006 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other SVCO insiders
Open-market trades in the last 12 months
About Walden C Rhines's insider trades
Walden C Rhines is Chief Executive Officer at Silvaco Group (SVCO). Since Aug 2, 2006, Walden has reported 14 open-market purchases worth $1.8M and 26 sales worth $46.9M on SEC Form 4. In the last 12 months: 3 buys ($215K).
4 sales (7% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include option exercises (48 filings), grants and awards (42 filings), shares withheld for taxes (13 filings), shares returned to the company (4 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every SVCO insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.