Thomas P. Gallagher
Insider
Activist
First SEC filing: Aug. 13, 2025 · Latest: June 18, 2026
Insider at
Insider transactions
0 buys (P)
12 sells (S)
Net: $-32,301,033
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. 3, 2026 | MIAX | M 10b5-1 | 47,000 | $12.00 | $564,000 | 1,470,275 Indirect | +3.30% | Acquired | 183.2% (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | S 10b5-1 | 47,000 | $42.43 | $1,994,210 | 1,423,275 Indirect | -3.20% | Disposed | -19.9% (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M | 16,666 | $12.00 | $199,992 | 760,605 Direct | +2.24% | Acquired | 183.2% (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M | 8,333 | $12.00 | $99,996 | 768,938 Direct | +1.10% | Acquired | 183.2% (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M | 13,140 | $15.22 | $199,991 | 782,078 Direct | +1.71% | Acquired | 123.3% (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M | 4,464 | $22.40 | $99,994 | 786,542 Direct | +0.57% | Acquired | 51.7% (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M 10b5-1 | 47,000 | · | · | 188,000 Indirect | -20.00% | Disposed | (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M | 16,666 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M | 8,333 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M | 13,140 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Sept. 3, 2026 | MIAX | M | 4,464 | · | · | 8,928 Direct | -33.33% | Disposed | (price as of 2026-10-05) |
| Aug. 19, 2026 | MIAX | S 10b5-1 | 149,700 | $41.13 | $6,157,161 | 1,423,275 Indirect | -9.52% | Disposed | -17.4% (price as of 2026-10-05) |
| Aug. 18, 2026 | MIAX | F | 150,300 | $42.41 | $6,374,223 | 1,572,975 Indirect | -8.72% | Disposed | -19.9% (price as of 2026-10-05) |
| Aug. 4, 2026 | MIAX | M 10b5-1 | 48,334 | $12.00 | $580,008 | 1,771,609 Indirect | +2.80% | Acquired | 183.2% (price as of 2026-10-05) |
| Aug. 4, 2026 | MIAX | S 10b5-1 | 48,334 | $45.69 | $2,208,380 | 1,723,275 Indirect | -2.73% | Disposed | -25.6% (price as of 2026-10-05) |
| Aug. 4, 2026 | MIAX | M 10b5-1 | 48,334 | · | · | 235,000 Indirect | -17.06% | Disposed | (price as of 2026-10-05) |
| July 13, 2026 | MIAX | M 10b5-1 | 70,000 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-05) |
| July 13, 2026 | MIAX | S 10b5-1 | 70,000 | $42.52 | $2,976,400 | 1,723,275 Indirect | -3.90% | Disposed | -20.1% (price as of 2026-10-05) |
| July 13, 2026 | MIAX | M 10b5-1 | 70,000 | $12.00 | $840,000 | 1,793,275 Indirect | +4.06% | Acquired | 183.2% (price as of 2026-10-05) |
| July 7, 2026 | MIAX | M 10b5-1 | 28,228 | · | · | 70,000 Indirect | -28.74% | Disposed | (price as of 2026-10-05) |
| July 7, 2026 | MIAX | S 10b5-1 | 28,228 | $42.27 | $1,193,198 | 1,723,275 Indirect | -1.61% | Disposed | -19.6% (price as of 2026-10-05) |
| July 7, 2026 | MIAX | M 10b5-1 | 28,228 | $12.00 | $338,736 | 1,751,503 Indirect | +1.64% | Acquired | 183.2% (price as of 2026-10-05) |
| July 6, 2026 | MIAX | M 10b5-1 | 41,772 | · | · | 98,228 Indirect | -29.84% | Disposed | (price as of 2026-10-05) |
| July 6, 2026 | MIAX | S 10b5-1 | 41,772 | $42.09 | $1,758,183 | 1,723,275 Indirect | -2.37% | Disposed | -19.3% (price as of 2026-10-05) |
| July 6, 2026 | MIAX | M 10b5-1 | 41,772 | $12.00 | $501,264 | 1,765,047 Indirect | +2.42% | Acquired | 183.2% (price as of 2026-10-05) |
| June 16, 2026 | MIAX | A | 237,175 | · | · | 237,175 Direct | · | Acquired | (price as of 2026-10-05) |
| June 16, 2026 | MIAX | A | 2,485 | · | · | 2,485 Direct | · | Acquired | (price as of 2026-10-05) |
| June 16, 2026 | MIAX | A | 232,977 | · | · | 743,939 Direct | +45.60% | Acquired | (price as of 2026-10-05) |
| June 2, 2026 | MIAX | M 10b5-1 | 70,000 | $12.00 | $840,000 | 1,793,275 Indirect | +4.06% | Acquired | 183.2% (price as of 2026-10-05) |
| June 2, 2026 | MIAX | S 10b5-1 | 70,000 | $42.36 | $2,965,200 | 1,723,275 Indirect | -3.90% | Disposed | -19.8% (price as of 2026-10-05) |
| June 2, 2026 | MIAX | M 10b5-1 | 70,000 | · | · | 140,000 Indirect | -33.33% | Disposed | (price as of 2026-10-05) |
| May 11, 2026 | MIAX | M | 24,999 | $12.00 | $299,988 | 510,962 Direct | +5.14% | Acquired | 183.2% (price as of 2026-10-05) |
| May 11, 2026 | MIAX | M | 24,999 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| May 5, 2026 | MIAX | M 10b5-1 | 15,771 | $12.00 | $189,252 | 1,739,046 Indirect | +0.92% | Acquired | 183.2% (price as of 2026-10-05) |
| May 5, 2026 | MIAX | S 10b5-1 | 15,771 | $47.92 | $755,746 | 1,723,275 Indirect | -0.91% | Disposed | -29.1% (price as of 2026-10-05) |
| May 5, 2026 | MIAX | M 10b5-1 | 15,771 | · | · | 210,000 Indirect | -6.99% | Disposed | (price as of 2026-10-05) |
| May 4, 2026 | MIAX | M 10b5-1 | 54,229 | $12.00 | $650,748 | 1,777,504 Indirect | +3.15% | Acquired | 183.2% (price as of 2026-10-05) |
| May 4, 2026 | MIAX | S 10b5-1 | 54,229 | $47.26 | $2,562,863 | 1,723,275 Indirect | -3.05% | Disposed | -28.1% (price as of 2026-10-05) |
| May 4, 2026 | MIAX | M 10b5-1 | 54,229 | · | · | 225,771 Indirect | -19.37% | Disposed | (price as of 2026-10-05) |
| April 15, 2026 | MIAX | M 10b5-1 | 70,001 | $12.00 | $840,012 | 1,897,400 Indirect | +3.83% | Acquired | 183.2% (price as of 2026-10-05) |
| April 15, 2026 | MIAX | S 10b5-1 | 70,001 | $43.36 | $3,035,243 | 1,827,399 Indirect | -3.69% | Disposed | -21.6% (price as of 2026-10-05) |
| April 15, 2026 | MIAX | S 10b5-1 | 104,124 | $43.36 | $4,514,817 | 1,723,275 Indirect | -5.70% | Disposed | -21.6% (price as of 2026-10-05) |
| April 15, 2026 | MIAX | S 10b5-1 | 49,900 | $43.68 | $2,179,632 | 485,963 Direct | -9.31% | Disposed | -22.2% (price as of 2026-10-05) |
| April 15, 2026 | MIAX | M 10b5-1 | 70,001 | · | · | 280,000 Indirect | -20.00% | Disposed | (price as of 2026-10-05) |
| March 30, 2026 | MIAX | F | 20,875 | $37.50 | $782,812 | 1,827,399 Indirect | -1.13% | Disposed | -9.4% (price as of 2026-10-05) |
| Feb. 10, 2026 | MIAX | F | 50,100 | $41.33 | $2,070,633 | 535,863 Direct | -8.55% | Disposed | -17.8% (price as of 2026-10-05) |
| Dec. 23, 2025 | MIAX | G | 2,000 | · | · | 585,963 Direct | -0.34% | Disposed | (price as of 2026-10-05) |
| Aug. 26, 2025 | MIAX | F | 192,220 | $33.90 | $6,516,258 | 1,848,274 Indirect | -9.42% | Disposed | 0.2% (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | C | 500 | · | · | 2,040,494 Indirect | +0.02% | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | C | 573,963 | · | · | 585,963 Direct | +4783.02% | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | C | 135,395 | · | · | 2,040,494 Indirect | +7.11% | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | C | 500 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | C | 573,963 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | C | 135,395 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 24,999 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 24,999 | · | · | 24,999 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 16,666 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 16,666 | · | · | 16,666 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 8,333 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 8,333 | · | · | 8,333 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 13,140 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 13,140 | · | · | 13,140 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 350,001 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 350,001 | · | · | 350,001 Indirect | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 283,334 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 283,334 | · | · | 283,334 Indirect | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 241,667 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 241,667 | · | · | 241,667 Indirect | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 286,860 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 286,860 | · | · | 286,860 Indirect | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 375,000 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-05) |
| Aug. 15, 2025 | MIAX | M | 375,000 | · | · | 375,000 Indirect | · | Acquired | (price as of 2026-10-05) |
| Aug. 13, 2025 | MIAX | P | 12,000 | $23.00 | $276,000 | 12,000 Direct | · | Acquired | 47.7% (price as of 2026-10-05) |
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. 3, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | May 28, 2028 | 47,000 | Disposed |
| Sept. 3, 2026 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | $12.00 | May 28, 2028 | 16,666 | Disposed |
| Sept. 3, 2026 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | $12.00 | July 30, 2029 | 8,333 | Disposed |
| Sept. 3, 2026 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | $15.22 | Jan. 27, 2031 | 13,140 | Disposed |
| Sept. 3, 2026 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | $22.40 | June 15, 2035 | 4,464 | Disposed |
| Aug. 4, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | May 28, 2028 | 48,334 | Disposed |
| July 13, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | Aug. 2, 2026 | 70,000 | Disposed |
| July 7, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | Aug. 2, 2026 | 28,228 | Disposed |
| July 6, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | Aug. 2, 2026 | 41,772 | Disposed |
| June 16, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $40.24 | June 15, 2036 | 237,175 | Acquired |
| June 16, 2026 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | $40.24 | June 15, 2036 | 2,485 | Acquired |
| June 2, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | Aug. 2, 2026 | 70,000 | Disposed |
| May 11, 2026 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | $12.00 | Aug. 2, 2026 | 24,999 | Disposed |
| May 5, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | Aug. 2, 2026 | 15,771 | Disposed |
| May 4, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | Aug. 2, 2026 | 54,229 | Disposed |
| April 15, 2026 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | $12.00 | Aug. 2, 2026 | 70,001 | Disposed |
| Aug. 15, 2025 | MIAX | Series B Preferred Stock | Common Stock | · | · | 500 | Disposed |
| Aug. 15, 2025 | MIAX | Nonvoting Common Stock | Common Stock | · | · | 573,963 | Disposed |
| Aug. 15, 2025 | MIAX | Nonvoting Common Stock | Common Stock | · | · | 135,395 | Disposed |
| Aug. 15, 2025 | MIAX | Incentive Stock Option (Right to Buy) | Nonvoting Common Stock | · | Aug. 2, 2026 | 24,999 | Disposed |
| Aug. 15, 2025 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | · | Aug. 2, 2026 | 24,999 | Acquired |
| Aug. 15, 2025 | MIAX | Incentive Stock Option (Right to Buy) | Nonvoting Common Stock | · | May 28, 2028 | 16,666 | Disposed |
| Aug. 15, 2025 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | · | May 28, 2028 | 16,666 | Acquired |
| Aug. 15, 2025 | MIAX | Incentive Stock Option (Right to Buy) | Nonvoting Common Stock | · | July 30, 2029 | 8,333 | Disposed |
| Aug. 15, 2025 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | · | July 30, 2029 | 8,333 | Acquired |
| Aug. 15, 2025 | MIAX | Incentive Stock Option (Right to Buy) | Nonvoting Common Stock | · | Jan. 27, 2031 | 13,140 | Disposed |
| Aug. 15, 2025 | MIAX | Incentive Stock Option (Right to Buy) | Common Stock | · | Jan. 27, 2031 | 13,140 | Acquired |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Nonvoting Common Stock | · | Aug. 2, 2026 | 350,001 | Disposed |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | · | Aug. 2, 2026 | 350,001 | Acquired |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Nonvoting Common Stock | · | May 28, 2028 | 283,334 | Disposed |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | · | May 28, 2028 | 283,334 | Acquired |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Nonvoting Common Stock | · | July 30, 2029 | 241,667 | Disposed |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | · | July 30, 2029 | 241,667 | Acquired |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Nonvoting Common Stock | · | Jan. 27, 2031 | 286,860 | Disposed |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | · | Jan. 27, 2031 | 286,860 | Acquired |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Nonvoting Common Stock | · | Sept. 9, 2031 | 375,000 | Disposed |
| Aug. 15, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | Common Stock | · | Sept. 9, 2031 | 375,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 15 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Aug. 13, 2025 | MIAX | Common Stock | 1,904,599 | Indirect |
| Aug. 13, 2025 | MIAX | Series B Preferred Stock | 500 | Indirect |
| Aug. 13, 2025 | MIAX | Nonvoting Common Stock | 573,963 | Direct |
| Aug. 13, 2025 | MIAX | Nonvoting Common Stock | 135,395 | Indirect |
| Aug. 13, 2025 | MIAX | Incentive Stock Option (Right to Buy) | 24,999 | Direct |
| Aug. 13, 2025 | MIAX | Incentive Stock Option (Right to Buy) | 16,666 | Direct |
| Aug. 13, 2025 | MIAX | Incentive Stock Option (Right to Buy) | 8,333 | Direct |
| Aug. 13, 2025 | MIAX | Incentive Stock Option (Right to Buy) | 13,140 | Direct |
| Aug. 13, 2025 | MIAX | Incentive Stock Option (Right to Buy) | 13,392 | Direct |
| Aug. 13, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | 350,001 | Indirect |
| Aug. 13, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | 283,334 | Indirect |
| Aug. 13, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | 241,667 | Indirect |
| Aug. 13, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | 286,860 | Indirect |
| Aug. 13, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | 375,000 | Indirect |
| Aug. 13, 2025 | MIAX | Nonqualified Stock Option (Right to Buy) | 97,858 | Indirect |