Nathan Mark Gronberg
Insider
First SEC filing: Oct. 1, 2020 · Latest: Oct. 1, 2025
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
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. 30, 2026 | MTN | M | 749 | · | · | 2,802 Direct | +36.48% | Acquired | (price as of 2026-10-02) |
| Sept. 30, 2026 | MTN | F | 329 | $137.18 | $45,132 | 2,473 Direct | -11.74% | Disposed | 2.9% (price as of 2026-10-02) |
| Sept. 30, 2026 | MTN | M | 749 | · | · | 1,500 Direct | -33.30% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2026 | MTN | M | 222 | · | · | 2,152 Direct | +11.50% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2026 | MTN | F | 99 | $141.29 | $13,988 | 2,053 Direct | -4.60% | Disposed | -0.1% (price as of 2026-10-02) |
| Sept. 29, 2026 | MTN | M | 222 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Sept. 27, 2026 | MTN | M | 344 | · | · | 2,083 Direct | +19.78% | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2026 | MTN | F | 153 | $136.11 | $20,825 | 1,930 Direct | -7.35% | Disposed | 3.7% (price as of 2026-10-02) |
| Sept. 27, 2026 | MTN | M | 344 | · | · | 344 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| Sept. 30, 2025 | MTN | A | 4,334 | · | · | 4,334 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 30, 2025 | MTN | A | 2,249 | · | · | 2,249 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2025 | MTN | M | 222 | · | · | 222 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2025 | MTN | M | 269 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2025 | MTN | F | 64 | $148.06 | $9,476 | 1,739 Direct | -3.55% | Disposed | -4.7% (price as of 2026-10-02) |
| Sept. 29, 2025 | MTN | M | 222 | · | · | 1,803 Direct | +14.04% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2025 | MTN | F | 78 | $148.06 | $11,549 | 1,581 Direct | -4.70% | Disposed | -4.7% (price as of 2026-10-02) |
| Sept. 29, 2025 | MTN | M | 269 | · | · | 1,659 Direct | +19.35% | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2025 | MTN | M | 344 | · | · | 688 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| Sept. 27, 2025 | MTN | F | 99 | $147.74 | $14,626 | 1,390 Direct | -6.65% | Disposed | -4.5% (price as of 2026-10-02) |
| Sept. 27, 2025 | MTN | M | 344 | · | · | 1,489 Direct | +30.04% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2024 | MTN | M | 222 | · | · | 444 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2024 | MTN | M | 268 | · | · | 269 Direct | -49.91% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2024 | MTN | F | 64 | $180.61 | $11,559 | 1,145 Direct | -5.29% | Disposed | -21.8% (price as of 2026-10-02) |
| Sept. 29, 2024 | MTN | M | 222 | · | · | 1,209 Direct | +22.49% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2024 | MTN | F | 78 | $180.61 | $14,088 | 987 Direct | -7.32% | Disposed | -21.8% (price as of 2026-10-02) |
| Sept. 29, 2024 | MTN | M | 268 | · | · | 1,065 Direct | +33.63% | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2024 | MTN | A | 3,171 | · | · | 3,171 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 27, 2024 | MTN | A | 1,032 | · | · | 1,032 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 24, 2024 | MTN | M | 123 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Sept. 24, 2024 | MTN | F | 36 | $188.32 | $6,780 | 797 Direct | -4.32% | Disposed | -25.0% (price as of 2026-10-02) |
| Sept. 24, 2024 | MTN | M | 123 | · | · | 833 Direct | +17.32% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2023 | MTN | A | 2,208 | · | · | 2,208 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2023 | MTN | A | 666 | · | · | 666 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2023 | MTN | M | 268 | · | · | 537 Direct | -33.29% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2023 | MTN | M | 87 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2023 | MTN | F | 78 | $221.89 | $17,307 | 710 Direct | -9.90% | Disposed | -36.4% (price as of 2026-10-02) |
| Sept. 29, 2023 | MTN | M | 268 | · | · | 788 Direct | +51.54% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2023 | MTN | F | 26 | $221.89 | $5,769 | 520 Direct | -4.76% | Disposed | -36.4% (price as of 2026-10-02) |
| Sept. 29, 2023 | MTN | M | 87 | · | · | 546 Direct | +18.95% | Acquired | (price as of 2026-10-02) |
| Sept. 24, 2023 | MTN | M | 122 | · | · | 495 Direct | +32.71% | Acquired | (price as of 2026-10-02) |
| Sept. 24, 2023 | MTN | M | 122 | · | · | 123 Direct | -49.80% | Disposed | (price as of 2026-10-02) |
| Sept. 24, 2023 | MTN | F | 36 | $244.26 | $8,793 | 459 Direct | -7.27% | Disposed | -42.2% (price as of 2026-10-02) |
| Sept. 29, 2022 | MTN | M | 87 | · | · | 87 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2022 | MTN | A | 805 | · | · | 805 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2022 | MTN | A | 2,337 | · | · | 2,337 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2022 | MTN | F | 26 | $213.55 | $5,552 | 373 Direct | -6.52% | Disposed | -33.9% (price as of 2026-10-02) |
| Sept. 29, 2022 | MTN | M | 87 | · | · | 399 Direct | +27.88% | Acquired | (price as of 2026-10-02) |
| Sept. 25, 2022 | MTN | M | 86 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Sept. 25, 2022 | MTN | F | 25 | $208.17 | $5,204 | 312 Direct | -7.42% | Disposed | -32.2% (price as of 2026-10-02) |
| Sept. 25, 2022 | MTN | M | 86 | · | · | 337 Direct | +34.26% | Acquired | (price as of 2026-10-02) |
| Sept. 24, 2022 | MTN | M | 122 | · | · | 245 Direct | -33.24% | Disposed | (price as of 2026-10-02) |
| Sept. 24, 2022 | MTN | F | 36 | $208.17 | $7,494 | 251 Direct | -12.54% | Disposed | -32.2% (price as of 2026-10-02) |
| Sept. 24, 2022 | MTN | M | 122 | · | · | 287 Direct | +73.94% | Acquired | (price as of 2026-10-02) |
| Feb. 1, 2022 | MTN | M | 68 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 1, 2022 | MTN | F | 24 | $278.37 | $6,681 | 165 Direct | -12.70% | Disposed | -49.3% (price as of 2026-10-02) |
| Feb. 1, 2022 | MTN | M | 68 | · | · | 189 Direct | +56.20% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2021 | MTN | M | 87 | · | · | 174 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2021 | MTN | S | 175 | $343.89 | $60,181 | 121 Direct | -59.12% | Disposed | -59.0% (price as of 2026-10-02) |
| Sept. 29, 2021 | MTN | F | 26 | $342.59 | $8,907 | 296 Direct | -8.07% | Disposed | -58.8% (price as of 2026-10-02) |
| Sept. 29, 2021 | MTN | M | 87 | · | · | 322 Direct | +37.02% | Acquired | (price as of 2026-10-02) |
| Sept. 25, 2021 | MTN | M | 86 | · | · | 86 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| Sept. 25, 2021 | MTN | F | 25 | $351.85 | $8,796 | 235 Direct | -9.62% | Disposed | -59.9% (price as of 2026-10-02) |
| Sept. 25, 2021 | MTN | M | 86 | · | · | 260 Direct | +49.43% | Acquired | (price as of 2026-10-02) |
| Sept. 24, 2021 | MTN | A | 367 | · | · | 367 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 24, 2021 | MTN | A | 1,262 | · | · | 1,262 Direct | · | Acquired | (price as of 2026-10-02) |
| Feb. 1, 2021 | MTN | M | 68 | · | · | 68 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| Feb. 1, 2021 | MTN | F | 24 | $261.83 | $6,284 | 174 Direct | -12.12% | Disposed | -46.1% (price as of 2026-10-02) |
| Feb. 1, 2021 | MTN | M | 68 | · | · | 198 Direct | +52.31% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2020 | MTN | A | 261 | · | · | 261 Direct | · | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2020 | MTN | A | 3,620 | · | · | 3,620 Direct | · | 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. 30, 2026 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 749 | Disposed |
| Sept. 29, 2026 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 222 | Disposed |
| Sept. 27, 2026 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 344 | Disposed |
| Sept. 30, 2025 | MTN | Share Appreciation Right | Common Stock | $149.57 | Sept. 30, 2035 | 4,334 | Acquired |
| Sept. 30, 2025 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 2,249 | Acquired |
| Sept. 29, 2025 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 222 | Disposed |
| Sept. 29, 2025 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 269 | Disposed |
| Sept. 27, 2025 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 344 | Disposed |
| Sept. 29, 2024 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 222 | Disposed |
| Sept. 29, 2024 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 268 | Disposed |
| Sept. 27, 2024 | MTN | Share Appreciation Right | Common Stock | $180.61 | Sept. 27, 2034 | 3,171 | Acquired |
| Sept. 27, 2024 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 1,032 | Acquired |
| Sept. 24, 2024 | MTN | Restricted Stock Units | Common Stock | $0.00 | · | 123 | Disposed |
| Sept. 29, 2023 | MTN | Share Appreciation Right | Common Stock | $221.89 | Sept. 29, 2033 | 2,208 | Acquired |
| Sept. 29, 2023 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 666 | Acquired |
| Sept. 29, 2023 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 268 | Disposed |
| Sept. 29, 2023 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 87 | Disposed |
| Sept. 24, 2023 | MTN | Restricted Stock Units | Common Stock | $0.00 | · | 122 | Disposed |
| Sept. 29, 2022 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 87 | Disposed |
| Sept. 29, 2022 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 805 | Acquired |
| Sept. 29, 2022 | MTN | Share Appreciation Right | Common Stock | $213.55 | Sept. 29, 2032 | 2,337 | Acquired |
| Sept. 25, 2022 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 86 | Disposed |
| Sept. 24, 2022 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 122 | Disposed |
| Feb. 1, 2022 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 68 | Disposed |
| Sept. 29, 2021 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 87 | Disposed |
| Sept. 25, 2021 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 86 | Disposed |
| Sept. 24, 2021 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 367 | Acquired |
| Sept. 24, 2021 | MTN | Share Appreciation Right | Common Stock | $351.85 | Sept. 24, 2031 | 1,262 | Acquired |
| Feb. 1, 2021 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 68 | Disposed |
| Sept. 29, 2020 | MTN | Restricted Share Unit | Common Stock | $0.00 | · | 261 | Acquired |
| Sept. 29, 2020 | MTN | Share Appreciation Right | Common Stock | $214.09 | Sept. 29, 2030 | 3,620 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 6 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Oct. 1, 2020 | MTN | Common Stock | 130 | Direct |
| Oct. 1, 2020 | MTN | Restricted Share Unit | 136 | Direct |
| Oct. 1, 2020 | MTN | Restricted Share Unit | 172 | Direct |
| Oct. 1, 2020 | MTN | Common Stock | 130 | Direct |
| Oct. 1, 2020 | MTN | Restricted Share Unit | 136 | Direct |
| Oct. 1, 2020 | MTN | Restricted Share Unit | 172 | Direct |