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John Ackerman
Activist
First SEC filing: March 24, 2026 · Latest: March 24, 2026
Insider at
Insider transactions
0 buys (P)
2 sells (S)
Net: $-32,747,843
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 27, 2026 | GRDN | M | 1,413,939 | · | · | 3,863,806 Indirect | +57.71% | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2026 | GRDN | M | 471,057 | · | · | 1,287,237 Indirect | +57.71% | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2026 | GRDN | M | 1,413,939 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Sept. 27, 2026 | GRDN | M | 471,057 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| March 28, 2026 | GRDN | M | 471,057 | · | · | 471,057 Indirect | -50.00% | Disposed | (price as of 2026-10-02) |
| March 28, 2026 | GRDN | M | 1,413,939 | · | · | 1,413,939 Indirect | -50.00% | Disposed | (price as of 2026-10-02) |
| March 28, 2026 | GRDN | M | 471,057 | · | · | 816,180 Indirect | +136.49% | Acquired | (price as of 2026-10-02) |
| March 28, 2026 | GRDN | M | 1,413,939 | · | · | 2,449,867 Indirect | +136.49% | Acquired | (price as of 2026-10-02) |
| March 20, 2026 | GRDN | S | 275,728 | $29.68 | $8,183,607 | 345,123 Indirect | -44.41% | Disposed | 42.8% (price as of 2026-10-02) |
| March 20, 2026 | GRDN | S | 827,636 | $29.68 | $24,564,236 | 1,035,928 Indirect | -44.41% | Disposed | 42.8% (price as of 2026-10-02) |
| Sept. 27, 2025 | GRDN | M | 1,413,940 | · | · | 1,863,564 Indirect | +314.47% | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2025 | GRDN | M | 471,057 | · | · | 620,851 Indirect | +314.47% | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2025 | GRDN | M | 1,413,940 | · | · | 2,827,878 Indirect | -33.33% | Disposed | (price as of 2026-10-02) |
| Sept. 27, 2025 | GRDN | M | 471,057 | · | · | 942,114 Indirect | -33.33% | Disposed | (price as of 2026-10-02) |
| May 28, 2025 | GRDN | S | 50,305 | $20.16 | $1,014,149 | 149,794 Indirect | -25.14% | Disposed | 110.2% (price as of 2026-10-02) |
| May 28, 2025 | GRDN | S | 150,998 | $20.16 | $3,044,120 | 449,624 Indirect | -25.14% | Disposed | 110.2% (price as of 2026-10-02) |
| May 27, 2025 | GRDN | S | 270,958 | $20.16 | $5,462,513 | 200,099 Indirect | -57.52% | Disposed | 110.2% (price as of 2026-10-02) |
| May 27, 2025 | GRDN | S | 813,318 | $20.16 | $16,396,491 | 600,622 Indirect | -57.52% | Disposed | 110.2% (price as of 2026-10-02) |
| March 28, 2025 | GRDN | M | 471,057 | · | · | 1,413,171 Indirect | -25.00% | Disposed | (price as of 2026-10-02) |
| March 28, 2025 | GRDN | M | 1,413,940 | · | · | 4,241,818 Indirect | -25.00% | Disposed | (price as of 2026-10-02) |
| March 28, 2025 | GRDN | M | 471,057 | · | · | 471,057 Indirect | · | Acquired | (price as of 2026-10-02) |
| March 28, 2025 | GRDN | M | 1,413,940 | · | · | 1,413,940 Indirect | · | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2024 | GRDN | A | 1,884,228 | · | · | 1,884,228 Indirect | · | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2024 | GRDN | A | 5,655,758 | · | · | 5,655,758 Indirect | · | Acquired | (price as of 2026-10-02) |
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 |
|---|---|---|---|---|---|---|---|
| Sept. 27, 2026 | GRDN | Class B Common Stock | Class A Common Stock | · | · | 1,413,939 | Disposed |
| Sept. 27, 2026 | GRDN | Class B Common Stock | Class A Common Stock | · | · | 471,057 | Disposed |
| March 28, 2026 | GRDN | Class B Common Stock | Class A Common Stock | · | · | 471,057 | Disposed |
| March 28, 2026 | GRDN | Class B Common Stock | Class A Common Stock | · | · | 1,413,939 | Disposed |
| Sept. 27, 2025 | GRDN | Class B Common Stock | Class A Common Stock | · | · | 1,413,940 | Disposed |
| Sept. 27, 2025 | GRDN | Class B Common Stock | Class A Common Stock | · | · | 471,057 | Disposed |
| March 28, 2025 | GRDN | Class B Common Stock | Class A Common Stock | · | · | 471,057 | Disposed |
| March 28, 2025 | GRDN | Class B Common Stock | Class A Common Stock | · | · | 1,413,940 | Disposed |
| Sept. 27, 2024 | GRDN | Class B Common Stock [F1] | Class A Common Stock | · | · | 1,884,228 | Acquired |
| Sept. 27, 2024 | GRDN | Class B Common Stock [F1] | Class A Common Stock | · | · | 5,655,758 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).