DS
David Sandberg
10% Owner
David Sandberg10% Owner
David Sandberg insider trades: Data I/O (DAIO) stock buys and sales
10% Owner, Data I/O Last trade Oct 20, 2026 141 Form 4 filings
$0
Sold, last 12 months
0 sales
$1000K
Bought, last 12 months
2 buys
177
Open-market trades
since 2007
11
Companies
last trade 2026
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where David reports to the SEC
DAIOData I/O
10% Owner · last filing Oct 27, 2026
+$1000K
JOBGEE Group
Insider · last filing Jun 12, 2025
No market trades
ASURAsure Software
Director · last filing Jun 2, 2020
-$5.2M
+$2.3M
SMTXSmtc
Director · last filing Apr 6, 2021
-$64K
+$1.3M
ISDRIssuer Direct
10% Owner · last filing Jun 2, 2017
-$3.9M
+$31K
CBAICord Blood America
Director · last filing May 18, 2015
No market trades
and 5 more companies
Open-market buys and sales
177 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Oct 20, 2026 | DAIO | ↑ Buy | 242,934 | $2.68 | $651K | By The Red Oak Fund, LP directly | Oct 27, 2026 (7d) |
| Oct 20, 2026 | DAIO | ↑ Buy | 130,199 | $2.68 | $349K | By The Red Oak Long Fund, LP directly | Oct 27, 2026 (7d) |
| May 12, 2020 | ASUR | ↓ Sell | 14,939 | $7.47 | $112K | By The Red Oak Fund, LP directly | May 14, 2020 (2d) |
| May 12, 2020 | ASUR | ↓ Sell | 3,616 | $7.47 | $27K | By The Red Oak Long Fund, LP directly | May 14, 2020 (2d) |
| Dec 11, 2019 | ASUR | ↓ Sell | 267,414 | $8.20 | $2.2M | By The Red Oak Fund, LP directly | Dec 13, 2019 (2d) |
| Dec 11, 2019 | ASUR | ↓ Sell | 167,838 | $8.20 | $1.4M | By The Red Oak Institutional Founders Lo | Dec 13, 2019 (2d) |
| Dec 11, 2019 | ASUR | ↓ Sell | 64,748 | $8.20 | $531K | By The Red Oak Long Fund, LP directly | Dec 13, 2019 (2d) |
| Nov 21, 2019 | ASUR | ↓ Sell | 70,715 | $8.55 | $604K | By The Red Oak Fund, LP directly | Nov 22, 2019 (1d) |
| Nov 21, 2019 | ASUR | ↓ Sell | 22,162 | $8.55 | $189K | By The Red Oak Institutional Founders Lo | Nov 22, 2019 (1d) |
| Nov 21, 2019 | ASUR | ↓ Sell | 17,123 | $8.55 | $146K | By The Red Oak Long Fund, LP directly | Nov 22, 2019 (1d) |
| Dec 13, 2017 | SMTX | ↑ Buy | 23,244 | $1.60 | $37K | By the Red Oak Fund LP directly | Dec 18, 2017 (5d) |
| Dec 13, 2017 | SMTX | ↑ Buy | 12,221 | $1.60 | $20K | By the Red Oak Long Fund LP directly | Dec 18, 2017 (5d) |
| Dec 12, 2017 | SMTX | ↑ Buy | 27,917 | $1.59 | $44K | By The Red Oak Long Fund LP | Dec 13, 2017 (1d) |
| Sep 28, 2017 | SMTX | ↑ Buy | 100 | $1.30 | $130 | By the Red Oak Fund LP directly | Oct 2, 2017 (4d) |
| Sep 25, 2017 | SMTX | ↑ Buy | 13,872 | $1.29 | $18K | By the Red Oak Fund LP directly | Sep 27, 2017 (2d) |
| Sep 22, 2017 | SMTX | ↑ Buy | 9,119 | $1.29 | $12K | By Pinnacle Opportunities Fund, LP direc | Sep 27, 2017 (5d) |
| Sep 22, 2017 | SMTX | ↑ Buy | 6,509 | $1.29 | $8K | By the Red Oak Long Fund LP directly | Sep 27, 2017 (5d) |
| Sep 21, 2017 | SMTX | ↑ Buy | 67,863 | $1.29 | $88K | By Pinnacle Opportunities Fund, LP direc | Sep 22, 2017 (1d) |
| Sep 21, 2017 | SMTX | ↑ Buy | 39,537 | $1.29 | $51K | By the Red Oak Fund LP directly | Sep 22, 2017 (1d) |
| Sep 21, 2017 | SMTX | ↑ Buy | 17,300 | $1.29 | $22K | By the Red Oak Long Fund LP directly | Sep 22, 2017 (1d) |
| Sep 15, 2017 | SMTX | ↑ Buy | 64,142 | $1.29 | $83K | By Pinnacle Opportunities Fund, LP direc | Sep 18, 2017 (3d) |
| Jun 30, 2017 | SMTX | ↑ Buy | 200 | $1.30 | $260 | By Pinnacle Opportunities Fund, LP direc | Jul 5, 2017 (5d) |
| Jun 29, 2017 | SMTX | ↑ Buy | 31,450 | $1.29 | $41K | By Pinnacle Opportunities Fund, LP direc | Jun 30, 2017 (1d) |
| Jun 19, 2017 | SMTX | ↑ Buy | 11,600 | $1.30 | $15K | By Pinnacle Opportunities Fund, LP direc | Jun 28, 2017 (9d) |
| Jun 19, 2017 | SMTX | ↑ Buy | 7,706 | $1.30 | $10K | By Pinnacle Opportunities Fund, LP direc | Jun 21, 2017 (2d) |
| Jun 14, 2017 | SMTX | ↑ Buy | 10,000 | $1.28 | $13K | By Pinnacle Opportunities Fund, LP direc | Jun 15, 2017 (1d) |
| Jun 12, 2017 | SMTX | ↑ Buy | 13,750 | $1.29 | $18K | By Pinnacle Opportunities Fund, LP direc | Jun 13, 2017 (1d) |
| Jun 8, 2017 | SMTX | ↑ Buy | 21,152 | $1.27 | $27K | By Pinnacle Opportunities Fund, LP direc | Jun 9, 2017 (1d) |
| Jun 2, 2017 | SMTX | ↑ Buy | 2,800 | $1.25 | $4K | By Pinnacle Opportunities Fund, LP direc | Jun 5, 2017 (3d) |
| May 31, 2017 | ISDR | ↓ Sell | 16,791 | $13.25 | $222K | By Pinnacle Opportunities Fund, LP. dire | Jun 2, 2017 (2d) |
| May 31, 2017 | ISDR | ↓ Sell | 16,100 | $13.25 | $213K | By The Red Oak Fund, LP directly | Jun 2, 2017 (2d) |
| May 31, 2017 | ISDR | ↓ Sell | 7,079 | $13.25 | $94K | By The Red Oak Long Fund, LP directly | Jun 2, 2017 (2d) |
| May 31, 2017 | SMTX | ↑ Buy | 17,663 | $1.25 | $22K | By Pinnacle Opportunities Fund, LP direc | Jun 1, 2017 (1d) |
| Apr 28, 2017 | ISDR | ↓ Sell | 36,101 | $11.55 | $417K | By Pinnacle Opportunities Fund, LP. dire | May 2, 2017 (4d) |
| Apr 28, 2017 | ISDR | ↓ Sell | 34,621 | $11.55 | $400K | By The Red Oak Fund, LP directly | May 2, 2017 (4d) |
| Apr 28, 2017 | ISDR | ↓ Sell | 15,220 | $11.55 | $176K | By The Red Oak Long Fund, LP directly | May 2, 2017 (4d) |
| Apr 11, 2017 | ISDR | ↓ Sell | 28,011 | $11.51 | $322K | By Pinnacle Opportunities Fund, LP. dire | Apr 12, 2017 (1d) |
| Apr 11, 2017 | ISDR | ↓ Sell | 27,068 | $11.51 | $311K | By The Red Oak Fund, LP directly | Apr 12, 2017 (1d) |
| Apr 11, 2017 | ISDR | ↓ Sell | 11,894 | $11.51 | $137K | By The Red Oak Long Fund, LP directly | Apr 12, 2017 (1d) |
| Apr 5, 2017 | ISDR | ↓ Sell | 1,859 | $11.81 | $22K | By Pinnacle Opportunities Fund, LP. dire | Apr 7, 2017 (2d) |
| Apr 5, 2017 | ISDR | ↓ Sell | 1,782 | $11.81 | $21K | By The Red Oak Fund, LP directly | Apr 7, 2017 (2d) |
| Apr 5, 2017 | ISDR | ↓ Sell | 784 | $11.81 | $9K | By The Red Oak Long Fund, LP directly | Apr 7, 2017 (2d) |
| Apr 4, 2017 | ISDR | ↓ Sell | 6,225 | $11.65 | $73K | By Pinnacle Opportunities Fund, LP. dire | Apr 5, 2017 (1d) |
| Apr 4, 2017 | ISDR | ↓ Sell | 5,777 | $11.66 | $67K | By The Red Oak Fund, LP directly | Apr 5, 2017 (1d) |
| Apr 4, 2017 | ISDR | ↓ Sell | 2,540 | $11.66 | $30K | By The Red Oak Long Fund, LP directly | Apr 5, 2017 (1d) |
| Mar 30, 2017 | ISDR | ↓ Sell | 520 | $10.55 | $5K | By Pinnacle Opportunities Fund, LP. dire | Apr 3, 2017 (4d) |
| Mar 30, 2017 | ISDR | ↓ Sell | 495 | $10.55 | $5K | By The Red Oak Fund, LP directly | Apr 3, 2017 (4d) |
| Mar 30, 2017 | ISDR | ↓ Sell | 220 | $10.55 | $2K | By The Red Oak Long Fund, LP directly | Apr 3, 2017 (4d) |
| Mar 21, 2017 | ISDR | ↓ Sell | 1,596 | $10.50 | $17K | By Pinnacle Opportunities Fund, LP. dire | Mar 24, 2017 (3d) |
| Mar 21, 2017 | ISDR | ↓ Sell | 1,531 | $10.50 | $16K | By The Red Oak Fund, LP directly | Mar 24, 2017 (3d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other DAIO insiders
Open-market trades in the last 12 months
About David Sandberg's insider trades
David Sandberg is a 10% owner of Data I/O (DAIO). Since Dec 31, 2007, David has reported 89 open-market purchases worth $5.8M and 88 sales worth $16.3M on SEC Form 4. In the last 12 months: 2 buys ($1000K).
Their filings also include grants and awards (23 filings), other transactions (17 filings), option exercises (7 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 DAIO insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.