MNTR Mentor Corporation
$0.03
Mentor Corporation (MNTR) Insider Activity
What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.
Insider signal
Bullish
Insiders bought more than they sold over this window — uncommon at any size.
Cluster activity
0 buyers in the last 30 days
0 buyers in the last 90 days
0 sellers in the last 90 days
Insiders buying
1
101 transactions
Insiders selling
0
0 transactions
Purchases
$74.2K
521,000 shares
Sales
$0
0 shares
Net activity
$74.2K
purchases less sales
Where they traded
Buy
Sell
Dot area is proportional to transaction value.
Last open-market purchase: April 14, 2026 , by Billingsley Chester .
Recent open-market activity
| Date | Insider | Role | Action | Shares | Price | Value | Held after |
|---|---|---|---|---|---|---|---|
| Billingsley Chester | Chief Executive Officer | Buy | 1,125 | $0.05 | $61 | 9,113,403 | |
| Billingsley Chester | Chief Executive Officer | Buy | 875 | $0.06 | $48 | 9,112,278 | |
| Billingsley Chester | Chief Executive Officer | Buy | 950 | $0.06 | $57 | 9,111,403 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,050 | $0.06 | $65 | 9,110,453 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.06 | $124 | 9,109,403 | |
| Billingsley Chester | Chief Executive Officer | Buy | 897 | $0.06 | $57 | 9,107,403 | |
| Billingsley Chester | Chief Executive Officer | Buy | 3 | $0.07 | $0 | 3,200,399 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,100 | $0.08 | $88 | 3,200,396 | |
| Billingsley Chester | Chief Executive Officer | Buy | 3,000 | $0.07 | $210 | 3,199,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.08 | $80 | 3,196,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,300 | $0.08 | $101 | 3,195,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 700 | $0.08 | $59 | 3,193,996 | |
| Billingsley Chester | Chief Executive Officer | Buy | 900 | $0.08 | $75 | 3,193,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 100 | $0.08 | $8 | 3,192,396 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.08 | $83 | 3,192,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,450 | $0.08 | $205 | 3,191,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 500 | $0.08 | $40 | 3,188,846 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,200 | $0.08 | $101 | 3,188,346 | |
| Billingsley Chester | Chief Executive Officer | Buy | 50 | $0.08 | $4 | 3,187,146 | |
| Billingsley Chester | Chief Executive Officer | Buy | 800 | $0.08 | $67 | 3,187,096 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,600 | $0.08 | $132 | 3,186,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,400 | $0.08 | $117 | 3,184,696 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.08 | $84 | 3,183,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,900 | $0.08 | $245 | 3,182,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,550 | $0.09 | $224 | 3,179,396 | |
| Billingsley Chester | Chief Executive Officer | Buy | 550 | $0.09 | $48 | 3,176,846 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.09 | $178 | 3,176,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,198 | $0.09 | $107 | 3,174,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 800 | $0.09 | $73 | 3,173,098 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.08 | $85 | 3,172,298 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2 | $0.09 | $0 | 3,171,298 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.09 | $180 | 3,171,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,100 | $0.09 | $97 | 3,169,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 900 | $0.09 | $81 | 3,168,196 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,400 | $0.08 | $119 | 3,167,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 600 | $0.08 | $51 | 3,165,896 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,800 | $0.09 | $157 | 3,165,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.09 | $90 | 3,163,496 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.09 | $89 | 3,162,496 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,200 | $0.09 | $106 | 3,161,496 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.09 | $188 | 3,160,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.09 | $178 | 3,158,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 400 | $0.10 | $39 | 3,156,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,600 | $0.08 | $128 | 3,155,896 | |
| Billingsley Chester | Chief Executive Officer | Buy | 500 | $0.08 | $40 | 3,154,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,500 | $0.10 | $147 | 3,153,796 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.09 | $176 | 3,152,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.08 | $85 | 3,150,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 700 | $0.10 | $69 | 3,149,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,300 | $0.10 | $130 | 3,148,596 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.08 | $83 | 3,147,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,500 | $0.10 | $148 | 3,146,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 500 | $0.09 | $46 | 3,144,796 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,300 | $0.09 | $119 | 3,144,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 700 | $0.10 | $71 | 3,142,996 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.10 | $99 | 3,142,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.10 | $198 | 3,141,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 500 | $0.11 | $55 | 3,139,296 | |
| Billingsley Chester 2 fills | Chief Executive Officer | Buy | 1,500 | $0.10 | $152 | 3,138,796 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.10 | $100 | 3,137,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.11 | $212 | 3,136,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,500 | $0.10 | $154 | 3,134,296 | |
| Billingsley Chester 2 fills | Chief Executive Officer | Buy | 1,500 | $0.11 | $161 | 3,132,796 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,500 | $0.10 | $156 | 3,131,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 500 | $0.11 | $54 | 3,129,796 | |
| Billingsley Chester | Chief Executive Officer | Buy | 1,000 | $0.10 | $105 | 3,129,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 2,000 | $0.10 | $195 | 3,128,296 | |
| Billingsley Chester 2 fills | Chief Executive Officer | Buy | 39,000 | $0.10 | $3.9K | 3,126,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 19,000 | $0.11 | $2.1K | 3,087,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 17,000 | $0.11 | $1.9K | 3,068,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 16,850 | $0.10 | $1.7K | 3,051,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 3,150 | $0.10 | $330 | 3,034,446 | |
| Billingsley Chester | Chief Executive Officer | Buy | 5,000 | $0.12 | $624 | 3,031,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 14,000 | $0.12 | $1.7K | 3,026,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 11,000 | $0.13 | $1.4K | 3,012,296 | |
| Billingsley Chester 2 fills | Chief Executive Officer | Buy | 5,000 | $0.13 | $674 | 3,001,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 20,000 | $1.00 | $20.0K | 2,996,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 9,355 | $0.95 | $8.9K | 2,976,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 15,645 | $0.10 | $1.5K | 2,966,941 | |
| Billingsley Chester | Chief Executive Officer | Buy | 12,000 | $0.10 | $1.2K | 2,951,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 13,000 | $0.09 | $1.2K | 2,939,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 12,000 | $0.09 | $1.1K | 2,926,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 13,000 | $0.09 | $1.1K | 2,914,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 12,000 | $0.09 | $1.1K | 2,901,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 25,000 | $0.09 | $2.2K | 2,889,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 25,000 | $0.09 | $2.2K | 2,864,296 | |
| Billingsley Chester 2 fills | Chief Executive Officer | Buy | 22,000 | $0.09 | $1.9K | 2,839,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 16,000 | $0.08 | $1.3K | 2,817,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 15,000 | $0.09 | $1.3K | 2,801,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 10,700 | $0.09 | $918 | 2,786,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 9,300 | $0.08 | $742 | 2,775,596 | |
| Billingsley Chester | Chief Executive Officer | Buy | 17,500 | $0.08 | $1.4K | 2,766,296 | |
| Billingsley Chester | Chief Executive Officer | Buy | 24,992 | $0.08 | $2.0K | 2,748,796 | |
| Billingsley Chester | Chief Executive Officer | Buy | 12,800 | $0.07 | $959 | 2,723,804 | |
| Billingsley Chester | Chief Executive Officer | Buy | 9,708 | $0.07 | $664 | 2,711,004 | |
| Billingsley Chester | Chief Executive Officer | Buy | 15,000 | $0.07 | $1.0K | 2,701,296 |
Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.