Erik Gershwind
CIK 1200390 · View on SEC EDGAR ↗
Insider
First SEC filing: Jan. 5, 2006 · Latest: Oct. 3, 2018
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 94 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
94 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| July 3, 2025 | MSM | S | 2,000 | $89.39 | $178,780 | 1,536,935 Direct | -0.13% | Disposed | 32.5% (price as of 2026-08-20) |
| Nov. 11, 2024 | MSM | S | 50,000 | $90.36 | $4,518,000 | 1,402,849 Direct | -3.44% | Disposed | 31.1% (price as of 2026-08-20) |
| Jan. 19, 2024 | MSM | S | 45,939 | $96.71 | $4,442,761 | 1,371,099 Direct | -3.24% | Disposed | 22.5% (price as of 2026-08-20) |
| Jan. 18, 2024 | MSM | S | 15,000 | $96.15 | $1,442,250 | 1,417,038 Direct | -1.05% | Disposed | 23.2% (price as of 2026-08-20) |
| Jan. 16, 2024 | MSM | S | 7,500 | $96.00 | $720,000 | 1,432,038 Direct | -0.52% | Disposed | 23.4% (price as of 2026-08-20) |
| Nov. 3, 2023 | MSM | S | 13,599 | $97.91 | $1,331,478 | 1,339,052 Direct | -1.01% | Disposed | 21.0% (price as of 2026-08-20) |
Showing latest 100 of 818 transactions
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 |
|---|---|---|---|---|---|---|---|
| Jan. 23, 2026 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (1,603) | — | — | 1,603 | Acquired |
| Nov. 5, 2025 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (771) | — | — | 771 | Disposed |
| Nov. 5, 2025 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,782) | — | — | 4,782 | Disposed |
| Nov. 4, 2025 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (231) | — | — | 231 | Disposed |
| Nov. 4, 2025 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (5,511) | — | — | 5,511 | Disposed |
| Nov. 4, 2025 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (587) | — | — | 587 | Disposed |
| Nov. 4, 2025 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,920) | — | — | 4,920 | Disposed |
| Nov. 3, 2025 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (363) | — | — | 363 | Disposed |
| Nov. 3, 2025 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,538) | — | — | 4,538 | Disposed |
| Nov. 3, 2025 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (20,934) | — | — | 20,934 | Acquired |
| July 2, 2025 | MSM | Options (right to buy) [F6] | Class A Common Stock, $0.001 par value (80,071) | $83.21 | Oct. 16, 2025 | 80,071 | Disposed |
| Nov. 6, 2024 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (1,640) | — | — | 1,640 | Disposed |
| Nov. 6, 2024 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (8,148) | — | — | 8,148 | Disposed |
| Nov. 5, 2024 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (547) | — | — | 547 | Disposed |
| Nov. 5, 2024 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,782) | — | — | 4,782 | Disposed |
| Nov. 4, 2024 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (365) | — | — | 365 | Disposed |
| Nov. 4, 2024 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,920) | — | — | 4,920 | Disposed |
| Nov. 4, 2024 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (22,044) | — | — | 22,044 | Acquired |
| Nov. 3, 2024 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (165) | — | — | 165 | Disposed |
| Nov. 3, 2024 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,538) | — | — | 4,538 | Disposed |
| Nov. 7, 2023 | MSM | Options (right to buy) [F14] | Class A Common Stock, $0.001 par value (73,469) | $79.60 | Oct. 19, 2024 | 73,469 | Disposed |
| Nov. 6, 2023 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (1,296) | — | — | 1,296 | Disposed |
| Nov. 6, 2023 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (8,148) | — | — | 8,148 | Disposed |
| Nov. 6, 2023 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (2,348) | — | — | 2,348 | Disposed |
| Nov. 6, 2023 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (7,985) | — | — | 7,985 | Disposed |
| Nov. 5, 2023 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (360) | — | — | 360 | Disposed |
| Nov. 5, 2023 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,781) | — | — | 4,781 | Disposed |
| Nov. 4, 2023 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (179) | — | — | 179 | Disposed |
| Nov. 4, 2023 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,920) | — | — | 4,920 | Disposed |
| Nov. 3, 2023 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (18,152) | — | — | 18,152 | Acquired |
| Oct. 17, 2023 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (3,305) | — | — | 3,305 | Disposed |
| Oct. 17, 2023 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (1,117) | — | — | 1,117 | Disposed |
| Oct. 4, 2023 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (102,435) | — | — | 83,621 | Disposed |
| Oct. 4, 2023 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (140,007) | — | — | 114,293 | Disposed |
| Oct. 4, 2023 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (61,027) | — | — | 49,818 | Disposed |
| Oct. 4, 2023 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value | — | — | 200,000 | Disposed |
| Oct. 4, 2023 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value | — | — | 713,188 | Disposed |
| Nov. 6, 2022 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (964) | — | — | 964 | Disposed |
| Nov. 6, 2022 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (8,148) | — | — | 8,148 | Disposed |
| Nov. 6, 2022 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (1,984) | — | — | 1,984 | Disposed |
| Nov. 6, 2022 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (7,984) | — | — | 7,984 | Disposed |
| Nov. 6, 2022 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (3,069) | — | — | 3,069 | Disposed |
| Nov. 5, 2022 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (179) | — | — | 179 | Disposed |
| Nov. 5, 2022 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (4,781) | — | — | 4,781 | Disposed |
| Nov. 4, 2022 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (19,680) | — | — | 19,680 | Acquired |
| Oct. 27, 2022 | MSM | Options (right to buy) [F2] | Class A Common Stock, $0.001 par value (72,659) | $71.33 | Oct. 25, 2023 | 72,659 | Disposed |
| Oct. 20, 2022 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (896) | — | — | 896 | Disposed |
| Oct. 20, 2022 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (2,764) | — | — | 2,764 | Disposed |
| Oct. 17, 2022 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (962) | — | — | 962 | Disposed |
| Oct. 17, 2022 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (3,305) | — | — | 3,305 | Disposed |
| Sept. 28, 2022 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (5,302) | — | — | 5,302 | Acquired |
| Sept. 28, 2022 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (5,302) | — | — | 5,302 | Disposed |
| Jan. 25, 2022 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (1,103) | — | — | 1,103 | Acquired |
| Nov. 30, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (729) | — | — | 729 | Acquired |
| Nov. 16, 2021 | MSM | Options (right to buy) [F2] | Class A Common Stock, $0.001 par value (84,059) | $58.90 | Oct. 18, 2022 | 84,059 | Disposed |
| Nov. 6, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (635) | — | — | 635 | Disposed |
| Nov. 6, 2021 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (8,147) | — | — | 8,147 | Disposed |
| Nov. 6, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (1,624) | — | — | 1,624 | Disposed |
| Nov. 6, 2021 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (7,984) | — | — | 7,984 | Disposed |
| Nov. 5, 2021 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (19,126) | — | — | 19,126 | Acquired |
| Oct. 26, 2021 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (2,314) | — | — | 2,314 | Disposed |
| Oct. 26, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (702) | — | — | 702 | Disposed |
| Oct. 20, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (764) | — | — | 764 | Disposed |
| Oct. 20, 2021 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (2,764) | — | — | 2,764 | Disposed |
| Oct. 17, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (807) | — | — | 807 | Disposed |
| Oct. 17, 2021 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (3,305) | — | — | 3,305 | Disposed |
| July 27, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (739) | — | — | 739 | Acquired |
| May 17, 2021 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (6,689) | — | — | 6,689 | Acquired |
| May 17, 2021 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (6,689) | — | — | 6,689 | Disposed |
| April 27, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (693) | — | — | 693 | Acquired |
| Jan. 26, 2021 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (788) | — | — | 788 | Acquired |
| Dec. 15, 2020 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (3,336) | — | — | 3,336 | Acquired |
| Nov. 24, 2020 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (688) | — | — | 688 | Acquired |
| Nov. 13, 2020 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (2,321) | — | — | 2,321 | Acquired |
| Nov. 13, 2020 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (2,321) | — | — | 2,321 | Disposed |
| Nov. 13, 2020 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (2,322) | — | — | 2,322 | Acquired |
| Nov. 10, 2020 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (1,948) | — | — | 1,948 | Acquired |
| Nov. 10, 2020 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (1,948) | — | — | 1,948 | Disposed |
| Nov. 10, 2020 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (1,949) | — | — | 1,949 | Acquired |
| Nov. 10, 2020 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (8,693) | — | — | 8,693 | Acquired |
| Nov. 10, 2020 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (8,693) | — | — | 8,693 | Disposed |
| Nov. 6, 2020 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (930) | — | — | 930 | Disposed |
| Nov. 6, 2020 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (7,984) | — | — | 7,984 | Disposed |
| Nov. 6, 2020 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (32,591) | — | — | 32,591 | Acquired |
| Oct. 26, 2020 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (484) | — | — | 484 | Disposed |
| Oct. 26, 2020 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (2,313) | — | — | 2,313 | Disposed |
| Oct. 20, 2020 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (509) | — | — | 509 | Disposed |
| Oct. 20, 2020 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (2,764) | — | — | 2,764 | Disposed |
| Oct. 19, 2020 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (674) | — | — | 674 | Disposed |
| Oct. 19, 2020 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (2,802) | — | — | 2,802 | Disposed |
| Oct. 17, 2020 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (510) | — | — | 510 | Disposed |
| Oct. 17, 2020 | MSM | Restricted Stock Units (RSU) | Class A Common Stock, $0.001 par value (3,305) | — | — | 3,305 | Disposed |
| July 28, 2020 | MSM | Dividend Equivalent Unit | Class A Common Stock, $0.001 par value (773) | — | — | 773 | Acquired |
| April 28, 2020 | MSM | Dividend Equivalent Unit | Class A Common Stock, $0.001 par value (834) | — | — | 834 | Acquired |
| Feb. 5, 2020 | MSM | Dividend Equivalent Unit | Class A Common Stock, $0.001 par value (5,042) | — | — | 5,042 | Acquired |
| Nov. 26, 2019 | MSM | Dividend Equivalent Unit | Class A Common Stock, $0.001 par value (631) | — | — | 631 | Acquired |
| Nov. 6, 2019 | MSM | Restricted Stock Unit | Class A Common Stock, $0.001 par value (31,937) | — | — | 31,937 | Acquired |
| Oct. 26, 2019 | MSM | Dividend Equivalent Units | Class A Common Stock, $0.001 par value (192) | — | — | 192 | Disposed |
| Sept. 26, 2019 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (3,056) | — | — | 3,056 | Acquired |
| Sept. 26, 2019 | MSM | Class B Common Stock | Class A Common Stock, $0.001 par value (3,056) | — | — | 3,056 | Disposed |
Showing latest 100 of 203 transactions
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 11 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Jan. 5, 2006 | MSM | Class A Common Stock, $.001 par value | 2,557 | Direct |
| Jan. 5, 2006 | MSM | Class B Common Stock, $.001 par value | 1,421,703 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (2,000) | 2,000 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (6,000) | 6,000 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (6,000) | 6,000 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (40,000) | 40,000 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (10,000) | 10,000 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (10,000) | 10,000 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (8,500) | 8,500 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (11,000) | 11,000 | Direct |
| Jan. 5, 2006 | MSM | Options (right to buy) [F1]→ Class A Common Stock, $.001 par value (13,500) | 13,500 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $871,411 | — | — | — | $1,425,750 | — | $26,710 | $5,873,837 |
| 2024 | $861,210 | — | — | — | — | — | $26,466 | $4,437,481 |
| 2022 | $815,937 | — | $3,249,890 | — | $2,362,500 | — | $24,916 | $6,453,243 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.