Martin D Madaus insider trades: Repligen (RGEN) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Martin reports to the SEC
and 3 more companies
Open-market buys and sales
50 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 8, 2025 | RGEN | ↑ Buy | 1,800 | $112.13 | $202K | By Martin D. Madaus 2011 Revocable Trust | Aug 12, 2025 (4d) |
| May 7, 2025 | HOLX | ↑ Buy | 5,445 | $55.24 | $301K | Revocable Trust | May 9, 2025 (2d) |
| Nov 19, 2024 | AZTA | ↑ Buy | 4,940 | $40.77 | $201K | Direct | Nov 19, 2024 (0d) |
| Jun 14, 2024 | RGEN | ↑ Buy | 1,615 | $124.94 | $202K | Direct | Jun 14, 2024 (0d) |
| May 8, 2023 | RGEN | ↑ Buy | 1,500 | $158.84 | $238K | Direct | May 8, 2023 (0d) |
| Aug 10, 2022 | QTRX | ↑ Buy | 89,667 | $8.43 | $756K | Indirect | Aug 10, 2022 (0d) |
| Nov 5, 2020 | QTRX | ↓ Sell10b5-1 | 2,972 | $40.81 | $121K | Direct | Nov 6, 2020 (1d) |
| Oct 20, 2020 | QTRX | ↓ Sell10b5-1 | 3,200 | $43.58 | $139K | Direct | Oct 20, 2020 (0d) |
| Oct 7, 2020 | QTRX | ↓ Sell10b5-1 | 3,200 | $36.82 | $118K | Direct | Oct 8, 2020 (1d) |
| Sep 29, 2020 | QTRX | ↓ Sell10b5-1 | 3,200 | $32.80 | $105K | Direct | Sep 30, 2020 (1d) |
| Sep 17, 2020 | QTRX | ↓ Sell | 3,200 | $32.80 | $105K | Direct | Sep 17, 2020 (0d) |
| Sep 2, 2020 | QTRX | ↓ Sell | 3,200 | $35.23 | $113K | Direct | Sep 3, 2020 (1d) |
| Aug 19, 2020 | QTRX | ↓ Sell | 3,200 | $34.72 | $111K | Direct | Aug 20, 2020 (1d) |
| Aug 5, 2020 | QTRX | ↓ Sell | 3,200 | $32.89 | $105K | Direct | Aug 5, 2020 (0d) |
| Jul 21, 2020 | QTRX | ↓ Sell | 3,200 | $31.25 | $100K | Direct | Jul 22, 2020 (1d) |
| Jul 9, 2020 | QTRX | ↓ Sell | 3,200 | $26.93 | $86K | Direct | Jul 10, 2020 (1d) |
| Jun 25, 2020 | QTRX | ↓ Sell | 3,200 | $26.23 | $84K | Direct | Jun 26, 2020 (1d) |
| Jun 9, 2020 | QTRX | ↓ Sell | 3,200 | $25.64 | $82K | Direct | Jun 10, 2020 (1d) |
| May 28, 2020 | QTRX | ↓ Sell | 3,200 | $26.27 | $84K | Direct | May 29, 2020 (1d) |
| May 13, 2020 | QTRX | ↓ Sell | 3,200 | $27.23 | $87K | Direct | May 14, 2020 (1d) |
| Apr 28, 2020 | QTRX | ↓ Sell | 4,800 | $26.37 | $127K | Indirect | Apr 29, 2020 (1d) |
| Apr 28, 2020 | QTRX | ↓ Sell | 3,200 | $26.26 | $84K | Direct | Apr 29, 2020 (1d) |
| Apr 15, 2020 | QTRX | ↓ Sell | 4,600 | $21.37 | $98K | Indirect | Apr 16, 2020 (1d) |
| Apr 15, 2020 | QTRX | ↓ Sell | 3,200 | $20.63 | $66K | Direct | Apr 16, 2020 (1d) |
| Apr 6, 2020 | QTRX | ↓ Sell | 4,400 | $20.35 | $90K | Indirect | Apr 8, 2020 (2d) |
| Apr 3, 2020 | QTRX | ↓ Sell | 6,400 | $20.00 | $128K | Direct | Apr 3, 2020 (0d) |
| Apr 3, 2020 | QTRX | ↓ Sell | 4,800 | $20.39 | $98K | Indirect | Apr 3, 2020 (0d) |
| Mar 5, 2020 | QTRX | ↓ Sell | 4,600 | $22.82 | $105K | Indirect | Mar 6, 2020 (1d) |
| Mar 5, 2020 | QTRX | ↓ Sell | 3,200 | $23.23 | $74K | Direct | Mar 6, 2020 (1d) |
| Feb 21, 2020 | QTRX | ↓ Sell | 4,600 | $28.06 | $129K | Indirect | Feb 21, 2020 (0d) |
| Feb 21, 2020 | QTRX | ↓ Sell | 3,200 | $28.28 | $90K | Direct | Feb 21, 2020 (0d) |
| Feb 5, 2020 | QTRX | ↓ Sell | 4,600 | $27.30 | $126K | Indirect | Feb 6, 2020 (1d) |
| Feb 5, 2020 | QTRX | ↓ Sell | 3,200 | $27.11 | $87K | Direct | Feb 6, 2020 (1d) |
| Jan 23, 2020 | QTRX | ↓ Sell | 4,600 | $25.51 | $117K | Indirect | Jan 24, 2020 (1d) |
| Jan 23, 2020 | QTRX | ↓ Sell | 3,200 | $25.00 | $80K | Direct | Jan 24, 2020 (1d) |
| Jan 9, 2020 | QTRX | ↓ Sell | 4,600 | $22.36 | $103K | Indirect | Jan 9, 2020 (0d) |
| Jan 9, 2020 | QTRX | ↓ Sell | 3,200 | $22.74 | $73K | Direct | Jan 9, 2020 (0d) |
| Dec 27, 2019 | QTRX | ↓ Sell | 4,600 | $23.68 | $109K | Indirect | Dec 30, 2019 (3d) |
| Dec 27, 2019 | QTRX | ↓ Sell | 3,200 | $23.94 | $77K | Direct | Dec 30, 2019 (3d) |
| Dec 11, 2019 | QTRX | ↓ Sell | 4,600 | $25.24 | $116K | Indirect | Dec 11, 2019 (0d) |
| Dec 11, 2019 | QTRX | ↓ Sell | 3,200 | $25.03 | $80K | Direct | Dec 11, 2019 (0d) |
| Nov 26, 2019 | QTRX | ↓ Sell | 4,600 | $25.24 | $116K | Indirect | Nov 26, 2019 (0d) |
| Nov 26, 2019 | QTRX | ↓ Sell | 3,200 | $25.13 | $80K | Direct | Nov 26, 2019 (0d) |
| Nov 13, 2019 | QTRX | ↓ Sell | 4,600 | $22.01 | $101K | Indirect | Nov 14, 2019 (1d) |
| Nov 13, 2019 | QTRX | ↓ Sell | 3,200 | $22.16 | $71K | Direct | Nov 14, 2019 (1d) |
| Nov 18, 2014 | MTD | ↓ Sell | 4,590 | $291.27 | $1.3M | Direct | Nov 20, 2014 (2d) |
| Aug 9, 2011 | MTD | ↑ Buy | 500 | $138.60 | $69K | Direct | Aug 10, 2011 (1d) |
| Jul 27, 2009 | MTD | ↑ Buy | 600 | $83.33 | $50K | Direct | Jul 28, 2009 (1d) |
| Aug 1, 2006 | MIL | ↑ Buy | 800 | $62.37 | $50K | Direct | Aug 2, 2006 (1d) |
| Oct 31, 2005 | MIL | ↑ Buy | 815 | $61.31 | $50K | Direct | Nov 1, 2005 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other RGEN insiders
Open-market trades in the last 12 months
About Martin D Madaus's insider trades
Martin D Madaus is an insider at Repligen (RGEN). Since Oct 31, 2005, Martin has reported 10 open-market purchases worth $2.1M and 40 sales worth $5.2M on SEC Form 4. There have been no open-market trades in the last 12 months.
4 sales (9% 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 grants and awards (58 filings), option exercises (30 filings), shares withheld for taxes (6 filings), shares returned to the company (2 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 RGEN insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.