Michael Houghton
CIK 1754753 · View on SEC EDGAR ↗
Insider
First SEC filing: May 6, 2026 · Latest: May 6, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 13 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 |
|---|---|---|---|---|---|---|---|---|---|
| May 5, 2026 | ARTNA | J | 1,000 | $31.41 | $31,410 | 4,000 Direct | +33.33% | Acquired | 12.1% (price as of 2026-08-20) |
| May 5, 2026 | ARTNA | J | 1,000 | $31.41 | $31,410 | 0 Direct | -100.00% | Disposed | 12.1% (price as of 2026-08-20) |
| May 5, 2026 | ARTNA | A | 1,000 | $31.41 | $31,410 | 1,000 Direct | — | Acquired | 12.1% (price as of 2026-08-20) |
| May 6, 2025 | ARTNA | J | 1,000 | $37.07 | $37,070 | 0 Direct | -100.00% | Disposed | -5.0% (price as of 2026-08-20) |
| May 6, 2025 | ARTNA | J | 1,000 | $37.07 | $37,070 | 3,000 Direct | +50.00% | Acquired | -5.0% (price as of 2026-08-20) |
| May 5, 2025 | ARTNA | A | 1,000 | $34.27 | $34,270 | 1,000 Direct | — | Acquired | 2.7% (price as of 2026-08-20) |
| May 9, 2024 | ARTNA | J | 1,000 | $54.88 | $54,880 | 0 Direct | -100.00% | Disposed | -35.9% (price as of 2026-08-20) |
| May 9, 2024 | ARTNA | J | 1,000 | $54.88 | $54,880 | 2,000 Direct | +100.00% | Acquired | -35.9% (price as of 2026-08-20) |
| May 6, 2024 | ARTNA | A | 1,000 | $37.07 | $37,070 | 1,000 Direct | — | Acquired | -5.0% (price as of 2026-08-20) |
| May 9, 2023 | ARTNA | A | 1,000 | $54.88 | $54,880 | 1,000 Direct | — | Acquired | -35.9% (price as of 2026-08-20) |
| May 3, 2023 | ARTNA | J | 1,000 | $45.58 | $45,580 | 0 Direct | -100.00% | Disposed | -22.8% (price as of 2026-08-20) |
| May 3, 2023 | ARTNA | J | 1,000 | $45.58 | $45,580 | 1,000 Direct | — | Acquired | -22.8% (price as of 2026-08-20) |
| May 3, 2022 | ARTNA | A | 1,000 | $45.58 | $45,580 | 1,000 Direct | — | Acquired | -22.8% (price as of 2026-08-20) |
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 |
|---|---|---|---|---|---|---|---|
| May 5, 2026 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 6, 2026 | 1,000 | Disposed |
| May 5, 2026 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 6, 2027 | 1,000 | Acquired |
| May 6, 2025 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 7, 2025 | 1,000 | Disposed |
| May 5, 2025 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 6, 2026 | 1,000 | Acquired |
| May 9, 2024 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 10, 2024 | 1,000 | Disposed |
| May 6, 2024 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 7, 2025 | 1,000 | Acquired |
| May 9, 2023 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 10, 2024 | 1,000 | Acquired |
| May 3, 2023 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 4, 2023 | 1,000 | Disposed |
| May 3, 2022 | ARTNA | Restricted Stock Grant | Class A Non-voting Common Stock (1,000) | $0.00 | May 4, 2023 | 1,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).