Gregory L Summe insider trades: Avantor (AVTR) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Gregory reports to the SEC
and 5 more companies
Open-market buys and sales
42 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Feb 12, 2026 | AVTR | ↑ Buy | 100,000 | $9.40 | $940K | By a Trust | Feb 12, 2026 (0d) |
| Oct 30, 2025 | AVTR | ↑ Buy | 100,000 | $11.25 | $1.1M | By a Trust | Oct 31, 2025 (1d) |
| Aug 21, 2025 | AVTR | ↑ Buy | 100,000 | $12.56 | $1.3M | By a Trust | Aug 22, 2025 (1d) |
| May 23, 2025 | AVTR | ↑ Buy | 30,000 | $12.50 | $375K | By a Trust | May 27, 2025 (4d) |
| May 22, 2025 | AVTR | ↑ Buy | 20,000 | $12.65 | $253K | By a Trust | May 22, 2025 (0d) |
| May 7, 2025 | AVTR | ↑ Buy | 25,000 | $12.00 | $300K | By a Trust | May 9, 2025 (2d) |
| Apr 28, 2025 | AVTR | ↑ Buy | 25,000 | $12.50 | $313K | By a Trust | Apr 29, 2025 (1d) |
| Feb 18, 2025 | STT | ↓ Sell | 10,815 | $100.00 | $1.1M | Direct | Feb 19, 2025 (1d) |
| Feb 18, 2025 | STT | ↓ Sell | 3,000 | $100.00 | $300K | By a Trust | Feb 19, 2025 (1d) |
| Feb 28, 2024 | NXPI | ↓ Sell | 4,695 | $245.27 | $1.2M | Direct | Feb 29, 2024 (1d) |
| Feb 28, 2024 | NXPI | ↓ Sell | 3,000 | $245.27 | $736K | By G L Summe Irrevocable Trust | Feb 29, 2024 (1d) |
| May 7, 2019 | STT | ↑ Buy | 3,000 | $64.50 | $194K | By a Trust | May 9, 2019 (2d) |
| Jun 27, 2017 | LMIA | ↓ Sell | 1,422,789 | $14.00 | $19.9M | By Glen Capital Partners Focus Fund, L.P | Jun 28, 2017 (1d) |
| Jun 27, 2017 | LMIA | ↓ Sell | 17,550 | $14.00 | $246K | Direct | Jun 28, 2017 (1d) |
| Aug 1, 2016 | RM | ↓ Sell | 20,000 | $18.83 | $377K | Direct | Aug 1, 2016 (0d) |
| Jul 29, 2016 | RM | ↓ Sell | 85,446 | $18.84 | $1.6M | Direct | Jul 29, 2016 (0d) |
| Jul 27, 2016 | RM | ↓ Sell | 40,210 | $18.94 | $762K | Direct | Jul 29, 2016 (2d) |
| Jun 8, 2016 | RM | ↓ Sell | 1,248 | $17.70 | $22K | Direct | Jun 9, 2016 (1d) |
| Jun 7, 2016 | RM | ↓ Sell | 7,365 | $17.84 | $131K | Direct | Jun 9, 2016 (2d) |
| Jun 2, 2015 | LMIA | ↑ Buy | 200,000 | $10.00 | $2.0M | By Glen Capital Partners Focus Fund, L.P | Jun 3, 2015 (1d) |
| Nov 25, 2013 | ADP | ↓ Sell | 15,000 | $80.04 | $1.2M | Direct | Nov 25, 2013 (0d) |
| Aug 19, 2011 | STT | ↑ Buy | 10,000 | $31.99 | $320K | Direct | Aug 23, 2011 (4d) |
| Feb 27, 2009 | PKI | ↓ Sell | 131,829 | $13.02 | $1.7M | Direct | Mar 3, 2009 (4d) |
| Aug 8, 2008 | PKI | ↓ Sell | 282,813 | $29.50 | $8.3M | Direct | Aug 12, 2008 (4d) |
| Aug 6, 2008 | PKI | ↓ Sell | 26,700 | $29.50 | $788K | Direct | Aug 8, 2008 (2d) |
| Jul 31, 2008 | PKI | ↓ Sell | 15,487 | $29.50 | $457K | Direct | Aug 1, 2008 (1d) |
| Jul 29, 2008 | PKI | ↓ Sell | 625,000 | $28.60 | $17.9M | Direct | Jul 31, 2008 (2d) |
| May 1, 2008 | PKI | ↓ Sell | 186,511 | $27.00 | $5.0M | Direct | May 2, 2008 (1d) |
| Apr 29, 2008 | PKI | ↓ Sell | 77,900 | $26.13 | $2.0M | Direct | May 1, 2008 (2d) |
| Apr 29, 2008 | PKI | ↓ Sell | 76,824 | $26.03 | $2.0M | Direct | May 1, 2008 (2d) |
| Apr 29, 2008 | PKI | ↓ Sell | 72,488 | $26.58 | $1.9M | Direct | May 1, 2008 (2d) |
| Apr 29, 2008 | PKI | ↓ Sell | 63,954 | $26.26 | $1.7M | Direct | May 1, 2008 (2d) |
| Apr 29, 2008 | PKI | ↓ Sell | 47,116 | $26.47 | $1.2M | Direct | May 1, 2008 (2d) |
| Apr 29, 2008 | PKI | ↓ Sell | 42,918 | $26.81 | $1.2M | Direct | May 1, 2008 (2d) |
| Feb 28, 2008 | PKI | ↓ Sell | 126,983 | $24.61 | $3.1M | Direct | Feb 29, 2008 (1d) |
| Feb 6, 2008 | PKI | ↓ Sell | 400 | $26.00 | $10K | Direct | Feb 8, 2008 (2d) |
| Sep 5, 2007 | PKI | ↓ Sell | 150,600 | $27.48 | $4.1M | Direct | Sep 5, 2007 (0d) |
| Sep 5, 2007 | PKI | ↓ Sell | 99,400 | $27.32 | $2.7M | Direct | Sep 5, 2007 (0d) |
| Sep 4, 2007 | PKI | ↓ Sell | 195,897 | $27.32 | $5.4M | Direct | Sep 5, 2007 (1d) |
| Sep 4, 2007 | PKI | ↓ Sell | 137,003 | $27.35 | $3.7M | Direct | Sep 5, 2007 (1d) |
| Aug 31, 2007 | PKI | ↓ Sell | 250,300 | $27.30 | $6.8M | Direct | Sep 5, 2007 (5d) |
| Aug 31, 2007 | PKI | ↓ Sell | 66,800 | $27.58 | $1.8M | Direct | Sep 5, 2007 (5d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other AVTR insiders
Open-market trades in the last 12 months
About Gregory L Summe's insider trades
Gregory L Summe is a director at Avantor (AVTR). Since Aug 31, 2007, Gregory has reported 10 open-market purchases worth $7.1M and 32 sales worth $99.6M on SEC Form 4. In the last 12 months: 1 buy ($940K).
Their filings also include grants and awards (75 filings), option exercises (16 filings), shares withheld for taxes (8 filings), shares returned to the company (3 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 AVTR insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.