Hwang Donghyun Thomas
Officer · MTSI
As of 2026-09-16, Hwang Donghyun Thomas has 76 Form 4 transactions on record across 1 company — 63 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in May in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $7.5M
- Indirect $0
| MTSI | direct | 29,756 sh | $7.5M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-06-25 | MTSI | Sale | 420 @ $382.04 | $160K | −1.3% of holding | 31,456 | Form 4 |
| 2026-06-25 | MTSI | Sale | 400 @ $388.65 | $155K | −1.3% of holding | 30,147 | Form 4 |
| 2026-06-25 | MTSI | Sale | 400 @ $386.62 | $155K | −1.3% of holding | 30,747 | Form 4 |
| 2026-06-25 | MTSI | Sale | 300 @ $382.91 | $115K | −1.0% of holding | 31,156 | Form 4 |
| 2026-06-25 | MTSI | Sale | 291 @ $389.74 | $113K | −1.0% of holding | 29,856 | Form 4 |
| 2026-06-25 | MTSI | Sale | 200 @ $387.25 | $77K | −0.7% of holding | 30,547 | Form 4 |
| 2026-06-25 | MTSI | Sale | 200 @ $375.34 | $75K | −0.6% of holding | 31,976 | Form 4 |
| 2026-06-25 | MTSI | Sale | 100 @ $391.94 | $39K | −0.3% of holding | 29,756 | Form 4 |
| 2026-06-25 | MTSI | Sale | 100 @ $379.80 | $38K | −0.3% of holding | 31,876 | Form 4 |
| 2026-06-25 | MTSI | Sale | 100 @ $369.99 | $37K | −0.3% of holding | 32,176 | Form 4 |
| 2026-06-25 | MTSI | Sale | 100 @ $367.30 | $37K | −0.3% of holding | 32,276 | Form 4 |
| 2026-06-25 | MTSI | Sale | 9 @ $384.35 | $3K | −0.0% of holding | 31,147 | Form 4 |
| 2026-05-18 | MTSI | Sale | 500 @ $360.38 | $180K | −1.5% of holding | 33,071 | Form 4 |
| 2026-05-18 | MTSI | Sale | 500 @ $356.68 | $178K | −1.5% of holding | 33,871 | Form 4 |
| 2026-05-18 | MTSI | Sale | 300 @ $358.84 | $108K | −0.9% of holding | 33,571 | Form 4 |
| 2026-05-18 | MTSI | Sale | 300 @ $355.06 | $107K | −0.9% of holding | 34,371 | Form 4 |
| 2026-05-18 | MTSI | Sale | 300 @ $353.32 | $106K | −0.9% of holding | 34,671 | Form 4 |
| 2026-05-18 | MTSI | Sale | 200 @ $367.50 | $74K | −0.6% of holding | 32,671 | Form 4 |
| 2026-05-18 | MTSI | Sale | 100 @ $377.70 | $38K | −0.3% of holding | 32,471 | Form 4 |
| 2026-05-18 | MTSI | Sale | 100 @ $369.06 | $37K | −0.3% of holding | 32,571 | Form 4 |
| 2026-05-18 | MTSI | Sale | 100 @ $364.93 | $36K | −0.3% of holding | 32,871 | Form 4 |
| 2026-05-18 | MTSI | Sale | 100 @ $362.89 | $36K | −0.3% of holding | 32,971 | Form 4 |
| 2026-05-18 | MTSI | Sale | 95 @ $381.23 | $36K | −0.3% of holding | 32,376 | Form 4 |
| 2026-04-30 | MTSI | Sale | 1,518 @ $274.79 | $417K | −4.0% of holding | 36,786 | Form 4 |
| 2026-04-30 | MTSI | Sale | 700 @ $278.42 | $195K | −1.9% of holding | 35,786 | Form 4 |
| 2026-04-30 | MTSI | Sale | 635 @ $279.75 | $178K | −1.8% of holding | 35,151 | Form 4 |
| 2026-04-30 | MTSI | Sale | 200 @ $280.88 | $56K | −0.6% of holding | 34,951 | Form 4 |
| 2026-04-30 | MTSI | Sale | 200 @ $276.81 | $55K | −0.5% of holding | 36,486 | Form 4 |
| 2026-04-30 | MTSI | Sale | 200 @ $273.48 | $55K | −0.5% of holding | 38,304 | Form 4 |
| 2026-04-30 | MTSI | Sale | 100 @ $275.73 | $28K | −0.3% of holding | 36,686 | Form 4 |
| 2026-04-30 | MTSI | Sale | 100 @ $271.40 | $27K | −0.3% of holding | 38,504 | Form 4 |
| 2026-04-30 | MTSI | Sale | 65 @ $281.59 | $18K | −0.2% of holding | 34,886 | Form 4 |
| 2026-02-02 | MTSI | Sale | 1,715 @ $217.38 | $373K | −3.9% of holding | 42,163 | Form 4 |
| 2026-02-02 | MTSI | Sale | 800 @ $227.92 | $182K | −1.9% of holding | 40,863 | Form 4 |
| 2026-02-02 | MTSI | Sale | 600 @ $231.45 | $139K | −1.5% of holding | 39,604 | Form 4 |
| 2026-02-02 | MTSI | Sale | 500 @ $232.68 | $116K | −1.3% of holding | 39,104 | Form 4 |
| 2026-02-02 | MTSI | Sale | 400 @ $226.58 | $91K | −1.0% of holding | 41,663 | Form 4 |
| 2026-02-02 | MTSI | Sale | 359 @ $228.70 | $82K | −0.9% of holding | 40,504 | Form 4 |
| 2026-02-02 | MTSI | Sale | 300 @ $234.83 | $70K | −0.8% of holding | 38,804 | Form 4 |
| 2026-02-02 | MTSI | Sale | 300 @ $230.20 | $69K | −0.7% of holding | 40,204 | Form 4 |
| 2026-02-02 | MTSI | Sale | 200 @ $235.81 | $47K | −0.5% of holding | 38,604 | Form 4 |
| 2026-02-02 | MTSI | Sale | 100 @ $225.01 | $23K | −0.2% of holding | 42,063 | Form 4 |
| 2025-12-04 | MTSI | Sale | 1,617 @ $183.40 | $297K | −3.4% of holding | 46,633 | Form 4 |
| 2025-12-04 | MTSI | Sale | 880 @ $187.60 | $165K | −1.9% of holding | 44,278 | Form 4 |
| 2025-12-04 | MTSI | Sale | 875 @ $186.76 | $163K | −1.9% of holding | 45,158 | Form 4 |
| 2025-12-04 | MTSI | Sale | 400 @ $185.35 | $74K | −0.9% of holding | 46,033 | Form 4 |
| 2025-12-04 | MTSI | Sale | 300 @ $188.62 | $57K | −0.7% of holding | 43,978 | Form 4 |
| 2025-12-04 | MTSI | Sale | 200 @ $184.24 | $37K | −0.4% of holding | 46,433 | Form 4 |
| 2025-12-04 | MTSI | Sale | 100 @ $189.36 | $19K | −0.2% of holding | 43,878 | Form 4 |
| 2025-11-19 | MTSI | Sale | 1,421 @ $160.35 | $228K | −2.7% of holding | 51,827 | Form 4 |
| 2025-11-19 | MTSI | Sale | 1,177 @ $161.38 | $190K | −2.3% of holding | 50,650 | Form 4 |
| 2025-11-19 | MTSI | Sale | 596 @ $162.38 | $97K | −1.2% of holding | 50,054 | Form 4 |
| 2025-11-19 | MTSI | Sale | 304 @ $163.64 | $50K | −0.6% of holding | 49,750 | Form 4 |
| 2025-11-19 | MTSI | Sale | 291 @ $158.27 | $46K | −0.5% of holding | 53,248 | Form 4 |
| 2025-07-22 | MTSI | Sale | 2,231 @ $136.78 | $305K | −6.4% of holding | 32,448 | Form 4 |
| 2025-07-22 | MTSI | Sale | 1,100 @ $135.85 | $149K | −3.1% of holding | 34,679 | Form 4 |
| 2025-07-22 | MTSI | Sale | 937 @ $139.89 | $131K | −3.0% of holding | 30,779 | Form 4 |
| 2025-07-22 | MTSI | Sale | 575 @ $138.73 | $80K | −1.8% of holding | 31,716 | Form 4 |
| 2025-07-22 | MTSI | Sale | 157 @ $137.41 | $22K | −0.5% of holding | 32,291 | Form 4 |
| 2025-05-08 | MTSI | Sale | 2,528 @ $119.26 | $301K | −7.6% of holding | 30,659 | Form 4 |
| 2025-05-08 | MTSI | Sale | 2,416 @ $117.89 | $285K | −6.8% of holding | 33,187 | Form 4 |
| 2025-04-30 | MTSI | Sale | 6,471 @ $100.00 | $647K | −15.4% of holding | 35,603 | Form 4 |
| 2025-03-03 | MTSI | Sale | 1,583 @ $116.61 | $185K | −3.6% of holding | 42,074 | Form 4 |
| 2025-01-27 | MTSI | Sale | 7,355 @ $133.00 | $978K | −14.4% of holding | 43,657 | Form 4 |
12 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-05-15 | MTSI | Award / grant | 85 | 34,971 | Form 4 |
| 2025-11-20 | MTSI | Gift | 1,500 | 48,250 | Form 4 |
| 2025-11-14 | MTSI | Award / grant | 83 | 53,539 | Form 4 |
| 2025-11-08 | MTSI | Withheld for tax | 471 | 53,456 | Form 4 |
| 2025-11-06 | MTSI | Withheld for tax | 17,117 | 53,927 | Form 4 |
| 2025-11-06 | MTSI | Award / grant | 38,591 | 71,044 | Form 4 |
| 2025-10-28 | MTSI | Award / grant | 2,332 | 32,453 | Form 4 |
| 2025-10-27 | MTSI | Withheld for tax | 412 | 30,121 | Form 4 |
| 2025-10-23 | MTSI | Withheld for tax | 246 | 30,533 | Form 4 |
| 2025-07-22 | MTSI | Option exercise | 5,000 | 35,779 | Form 4 |
| 2025-07-22 | MTSI | Option exercise | 5,000 | 0 | Form 4 |
| 2025-05-16 | MTSI | Award / grant | 120 | 30,779 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.