Erin Kemmler Barta
CIK 1666979 · View on SEC EDGAR ↗
Insider
First SEC filing: Feb. 16, 2016 · Latest: Feb. 16, 2016
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 5 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| June 3, 2025 | MTEX | A | 10,000 | — | — | 19,000 Direct | +111.11% | Acquired | (price as of 2026-08-21) |
| June 3, 2025 | MTEX | A | 10,000 | — | — | 19,000 Direct | +111.11% | Acquired | (price as of 2026-08-21) |
| Nov. 29, 2021 | MTEX | M | 3,000 | $5.72 | $17,160 | 0 Direct | -100.00% | Disposed | 9.4% (price as of 2026-08-21) |
| Nov. 29, 2021 | MTEX | M | 3,000 | $5.72 | $17,160 | 3,000 Direct | — | Acquired | 9.4% (price as of 2026-08-21) |
| April 2, 2018 | MTEX | A | 9,000 | — | — | 9,000 Direct | — | Acquired | (price as of 2026-08-21) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| June 3, 2025 | MTEX | Right to Purchase Common Stock | Common Stock, par value $0.0001 per share (10,000) | $10.60 | June 3, 2035 | 10,000 | Acquired |
| June 3, 2025 | MTEX | Right to Purchase Common Stock | Common Stock, par value $0.0001 per share (10,000) | $10.60 | June 3, 2035 | 10,000 | Acquired |
| Nov. 29, 2021 | MTEX | Right to Purchase Common Stock | Common Stock Par Value $0.0001 Per Share (3,000) | $5.72 | Feb. 21, 2023 | 3,000 | Disposed |
| April 2, 2018 | MTEX | Right to Purchase Common Stock | Common Stock, par value $0.0001 per share (9,000) | $15.70 | April 2, 2028 | 9,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 5 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Feb. 16, 2016 | MTEX | Right to Purchase Common Stock→ Common Stock Par Value $0.0001 per share (75) | 75 | Direct |
| Feb. 16, 2016 | MTEX | Right to Purchase Common Stock→ Common Stock Par Value $0.0001 per share (100) | 100 | Direct |
| Feb. 16, 2016 | MTEX | Right to Purchase Common Stock→ Common Stock Par Value $0.0001 per share (3,000) | 3,000 | Direct |
| Feb. 16, 2016 | MTEX | Right to Purchase Common Stock→ Common Stock Par Value $0.0001 per share (2,500) | 2,500 | Direct |
| Feb. 16, 2016 | MTEX | Right to Purchase Common Stock→ Common Stock Par Value $0.0001 per share (3,000) | 3,000 | Direct |