Walter S Woltosz insider trades: Simulations Plus (SLP) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Walter reports to the SEC
Open-market buys and sales
92 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jul 1, 2026 | SLP | ↓ Sell | 4,177 | $18.44 | $77K | Direct | Jul 6, 2026 (5d) |
| Jun 1, 2026 | SLP | ↓ Sell | 15,000 | $17.43 | $261K | Direct | Jun 2, 2026 (1d) |
| May 4, 2026 | SLP | ↓ Sell | 15,000 | $15.13 | $227K | Direct | May 5, 2026 (1d) |
| Oct 1, 2025 | SLP | ↓ Sell | 20,000 | $15.39 | $308K | Direct | Oct 3, 2025 (2d) |
| Jul 1, 2025 | SLP | ↓ Sell | 20,000 | $18.33 | $367K | Direct | Jul 2, 2025 (1d) |
| Jun 2, 2025 | SLP | ↓ Sell | 20,000 | $27.15 | $543K | Direct | Jun 3, 2025 (1d) |
| May 1, 2025 | SLP | ↓ Sell | 20,000 | $33.51 | $670K | Direct | May 1, 2025 (0d) |
| Apr 1, 2025 | SLP | ↓ Sell | 20,000 | $24.09 | $482K | Direct | Apr 2, 2025 (1d) |
| Mar 3, 2025 | SLP | ↓ Sell | 20,000 | $28.68 | $574K | Direct | Mar 4, 2025 (1d) |
| Feb 3, 2025 | SLP | ↓ Sell | 20,000 | $33.91 | $678K | Direct | Feb 4, 2025 (1d) |
| Jan 2, 2025 | SLP | ↓ Sell | 20,000 | $27.88 | $558K | Direct | Jan 3, 2025 (1d) |
| Dec 2, 2024 | SLP | ↓ Sell | 20,000 | $31.76 | $635K | Direct | Dec 3, 2024 (1d) |
| Nov 1, 2024 | SLP | ↓ Sell | 20,000 | $27.66 | $553K | Direct | Nov 5, 2024 (4d) |
| Oct 1, 2024 | SLP | ↓ Sell | 20,000 | $31.26 | $625K | Direct | Oct 2, 2024 (1d) |
| Sep 3, 2024 | SLP | ↓ Sell | 20,000 | $35.18 | $704K | Direct | Sep 4, 2024 (1d) |
| Aug 1, 2024 | SLP | ↓ Sell | 20,000 | $39.63 | $793K | Direct | Aug 2, 2024 (1d) |
| Jul 1, 2024 | SLP | ↓ Sell | 20,000 | $46.71 | $934K | Direct | Jul 2, 2024 (1d) |
| Jun 3, 2024 | SLP | ↓ Sell | 20,000 | $46.25 | $925K | Direct | Jun 4, 2024 (1d) |
| May 1, 2024 | SLP | ↓ Sell | 20,000 | $45.95 | $919K | Direct | May 2, 2024 (1d) |
| Apr 1, 2024 | SLP | ↓ Sell | 20,000 | $39.94 | $799K | Direct | Apr 2, 2024 (1d) |
| Mar 1, 2024 | SLP | ↓ Sell | 20,000 | $41.41 | $828K | Direct | Mar 5, 2024 (4d) |
| Feb 2, 2024 | SLP | ↓ Sell | 20,000 | $38.00 | $760K | Direct | Feb 5, 2024 (3d) |
| Jan 2, 2024 | SLP | ↓ Sell | 20,000 | $44.46 | $889K | Direct | Jan 4, 2024 (2d) |
| Dec 5, 2023 | SLP | ↓ Sell | 60,000 | $38.72 | $2.3M | Direct | Dec 5, 2023 (0d) |
| Nov 2, 2023 | SLP | ↓ Sell | 60,000 | $34.39 | $2.1M | Direct | Nov 3, 2023 (1d) |
| Jun 29, 2023 | SLP | ↓ Sell | 20,000 | $43.03 | $861K | Direct | Jun 30, 2023 (1d) |
| May 30, 2023 | SLP | ↓ Sell | 20,000 | $46.05 | $921K | Direct | May 31, 2023 (1d) |
| Apr 26, 2023 | SLP | ↓ Sell | 20,000 | $41.52 | $830K | Direct | Apr 27, 2023 (1d) |
| Mar 29, 2023 | SLP | ↓ Sell | 20,000 | $42.81 | $856K | Direct | Mar 30, 2023 (1d) |
| Feb 24, 2023 | SLP | ↓ Sell | 20,000 | $38.04 | $761K | Direct | Feb 27, 2023 (3d) |
| Jan 30, 2023 | SLP | ↓ Sell | 20,000 | $39.71 | $794K | Direct | Jan 31, 2023 (1d) |
| Dec 28, 2022 | SLP | ↓ Sell | 20,000 | $36.15 | $723K | Direct | Dec 29, 2022 (1d) |
| Nov 28, 2022 | SLP | ↓ Sell | 20,000 | $39.89 | $798K | Direct | Nov 29, 2022 (1d) |
| Oct 27, 2022 | SLP | ↓ Sell | 20,000 | $41.64 | $833K | Direct | Oct 31, 2022 (4d) |
| Sep 28, 2022 | SLP | ↓ Sell | 20,000 | $49.55 | $991K | Direct | Sep 29, 2022 (1d) |
| Aug 30, 2022 | SLP | ↓ Sell | 20,000 | $61.41 | $1.2M | Direct | Aug 31, 2022 (1d) |
| Jul 27, 2022 | SLP | ↓ Sell | 20,000 | $61.19 | $1.2M | Direct | Jul 29, 2022 (2d) |
| Jun 29, 2022 | SLP | ↓ Sell | 20,000 | $48.07 | $961K | Direct | Jun 30, 2022 (1d) |
| May 27, 2022 | SLP | ↓ Sell | 20,000 | $47.99 | $960K | Direct | Jun 1, 2022 (5d) |
| Apr 28, 2022 | SLP | ↓ Sell | 20,000 | $46.89 | $938K | Direct | Apr 29, 2022 (1d) |
| Mar 30, 2022 | SLP | ↓ Sell | 20,000 | $48.75 | $975K | Direct | Mar 31, 2022 (1d) |
| Feb 25, 2022 | SLP | ↓ Sell | 20,000 | $37.99 | $760K | Direct | Feb 28, 2022 (3d) |
| Jan 27, 2022 | SLP | ↓ Sell | 20,000 | $39.32 | $786K | Direct | Jan 28, 2022 (1d) |
| Dec 30, 2021 | SLP | ↓ Sell | 20,000 | $48.74 | $975K | Direct | Jan 3, 2022 (4d) |
| Nov 29, 2021 | SLP | ↓ Sell | 20,000 | $48.40 | $968K | Direct | Nov 30, 2021 (1d) |
| Oct 27, 2021 | SLP | ↓ Sell | 20,000 | $45.32 | $906K | Direct | Oct 29, 2021 (2d) |
| Sep 28, 2021 | SLP | ↓ Sell | 20,000 | $38.54 | $771K | Direct | Sep 29, 2021 (1d) |
| Aug 31, 2021 | SLP | ↓ Sell | 1,497 | $44.10 | $66K | Direct | Sep 1, 2021 (1d) |
| Aug 30, 2021 | SLP | ↓ Sell | 18,503 | $44.78 | $829K | Direct | Aug 31, 2021 (1d) |
| Jul 30, 2021 | SLP | ↓ Sell | 20,000 | $47.14 | $943K | Direct | Aug 2, 2021 (3d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other SLP insiders
Open-market trades in the last 12 months
About Walter S Woltosz's insider trades
Walter S Woltosz is a director at Simulations Plus (SLP). Since Jan 29, 2016, Walter has reported 1 open-market purchase worth $1.4M and 91 sales worth $71.4M on SEC Form 4. In the last 12 months: 3 sales ($565K).
21 sales (27% 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 (40 filings), gifts (14 filings), option exercises (7 filings), shares returned to the company (6 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 SLP insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.