John Ackerman
CIK 2037898 · View on SEC EDGAR ↗
Activist
First SEC filing: March 24, 2026 · Latest: March 24, 2026
On this page
Insider at
Insider transactions
0 buys (P)
2 sells (S)
Net:
$-32,747,843
+ 14 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
14 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| March 20, 2026 | GRDN | S | 275,728 | $29.68 | $8,183,607 | 345,123 Indirect | -44.41% | Disposed | 29.4% (price as of 2026-08-19) |
| March 20, 2026 | GRDN | S | 827,636 | $29.68 | $24,564,236 | 1,035,928 Indirect | -44.41% | Disposed | 29.4% (price as of 2026-08-19) |
| May 28, 2025 | GRDN | S | 50,305 | $20.16 | $1,014,149 | 149,794 Indirect | -25.14% | Disposed | 90.5% (price as of 2026-08-19) |
| May 28, 2025 | GRDN | S | 150,998 | $20.16 | $3,044,120 | 449,624 Indirect | -25.14% | Disposed | 90.5% (price as of 2026-08-19) |
| May 27, 2025 | GRDN | S | 270,958 | $20.16 | $5,462,513 | 200,099 Indirect | -57.52% | Disposed | 90.5% (price as of 2026-08-19) |
| May 27, 2025 | GRDN | S | 813,318 | $20.16 | $16,396,491 | 600,622 Indirect | -57.52% | Disposed | 90.5% (price as of 2026-08-19) |
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 |
|---|---|---|---|---|---|---|---|
| March 28, 2026 | GRDN | Class B Common Stock | Class A Common Stock (471,057) | — | — | 471,057 | Disposed |
| March 28, 2026 | GRDN | Class B Common Stock | Class A Common Stock (1,413,939) | — | — | 1,413,939 | Disposed |
| Sept. 27, 2025 | GRDN | Class B Common Stock | Class A Common Stock (1,413,940) | — | — | 1,413,940 | Disposed |
| Sept. 27, 2025 | GRDN | Class B Common Stock | Class A Common Stock (471,057) | — | — | 471,057 | Disposed |
| March 28, 2025 | GRDN | Class B Common Stock | Class A Common Stock (471,057) | — | — | 471,057 | Disposed |
| March 28, 2025 | GRDN | Class B Common Stock | Class A Common Stock (1,413,940) | — | — | 1,413,940 | Disposed |
| Sept. 27, 2024 | GRDN | Class B Common Stock [F1] | Class A Common Stock (1,884,228) | — | — | 1,884,228 | Acquired |
| Sept. 27, 2024 | GRDN | Class B Common Stock [F1] | Class A Common Stock (5,655,758) | — | — | 5,655,758 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).