Wang David H

Director · Officer · Ten-percent owner · ACMR

As of 2026-09-16, Wang David H has 71 Form 4 transactions on record across 1 company — 48 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 September in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct $8.4M
Indirect $402K

ACMR	direct	130,000 sh	$8.4M
ACMR	indirect	6,208 sh	$402K

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

ACMR · 71 trades

Filing ledger

Date	Company	Action	Shares @ price	Value	Ownership Δ	Owned after	Filing
2026-09-09	ACMR	Sale	33,493 @ $73.80	$2.5M	−3.8% of holding	839,215	Form 4
2026-09-09	ACMR	Sale	18,934 @ $74.67	$1.4M	−2.3% of holding	820,281	Form 4
2026-09-09	ACMR	Sale	11,666 @ $75.58	$882K	−1.4% of holding	808,615	Form 4
2026-09-09	ACMR	Sale	4,807 @ $76.73	$369K	−0.6% of holding	803,808	Form 4
2026-09-09	ACMR	Sale	1,100 @ $77.59	$85K	−0.1% of holding	802,708	Form 4
2026-09-08	ACMR	Sale	51,374 @ $77.15	$4.0M	−5.9% of holding	816,531	Form 4
2026-09-08	ACMR	Sale	12,323 @ $78.08	$962K	−1.5% of holding	804,208	Form 4
2026-09-08	ACMR	Sale	4,803 @ $75.99	$365K	−0.6% of holding	867,905	Form 4
2026-09-08	ACMR	Sale	1,500 @ $78.57	$118K	−0.2% of holding	802,708	Form 4
2026-06-04	ACMR	Sale	17,543 @ $85.11	$1.5M	−2.1% of holding	823,107	Form 4
2026-06-04	ACMR	Sale	10,992 @ $86.07	$946K	−1.3% of holding	812,115	Form 4
2026-06-04	ACMR	Sale	8,581 @ $87.13	$748K	−1.1% of holding	803,534	Form 4
2026-06-04	ACMR	Sale	2,060 @ $83.86	$173K	−0.2% of holding	840,650	Form 4
2026-06-04	ACMR	Sale	826 @ $87.91	$73K	−0.1% of holding	802,708	Form 4
2026-06-03	ACMR	Sale	32,450 @ $89.84	$2.9M	−3.8% of holding	819,663	Form 4
2026-06-03	ACMR	Sale	9,925 @ $90.78	$901K	−1.2% of holding	809,738	Form 4
2026-06-03	ACMR	Sale	6,295 @ $88.98	$560K	−0.7% of holding	852,113	Form 4
2026-06-03	ACMR	Sale	5,843 @ $92.38	$540K	−0.7% of holding	803,895	Form 4
2026-06-03	ACMR	Sale	4,300 @ $87.57	$377K	−0.5% of holding	858,408	Form 4
2026-06-03	ACMR	Sale	1,187 @ $93.04	$110K	−0.1% of holding	802,708	Form 4
2026-03-12	ACMR	Sale	38,737 @ $45.74	$1.8M	−4.6% of holding	803,410	Form 4
2026-03-12	ACMR	Sale	10,561 @ $44.92	$474K	−1.2% of holding	842,147	Form 4
2026-03-12	ACMR	Sale	702 @ $46.57	$33K	−0.1% of holding	802,708	Form 4
2026-03-11	ACMR	Sale	55,373 @ $47.89	$2.7M	−6.4% of holding	807,335	Form 4
2026-03-11	ACMR	Sale	4,627 @ $48.34	$224K	−0.6% of holding	802,708	Form 4
2025-12-04	ACMR	Sale	40,183 @ $34.42	$1.4M	−4.8% of holding	802,708	Form 4
2025-12-04	ACMR	Sale	19,817 @ $33.52	$664K	−2.3% of holding	842,891	Form 4
2025-12-03	ACMR	Sale	68,800 @ $33.05	$2.3M	−7.9% of holding	803,908	Form 4
2025-12-03	ACMR	Sale	1,200 @ $33.56	$40K	−0.1% of holding	802,708	Form 4
2025-09-04	ACMR	Sale	60,000 @ $26.44	$1.6M	−8.2% of holding	672,708	Form 4
2025-09-03	ACMR	Sale	66,057 @ $26.73	$1.8M	−8.9% of holding	676,651	Form 4
2025-09-03	ACMR	Sale	3,943 @ $27.31	$108K	−0.6% of holding	672,708	Form 4
2025-05-22	ACMR	Sale	60,000 @ $22.63	$1.4M	−8.2% of holding	672,708	Form 4
2025-05-21	ACMR	Sale	69,992 @ $23.60	$1.7M	−9.4% of holding	672,716	Form 4
2025-05-21	ACMR	Sale	8 @ $24.04	$192	−0.0% of holding	672,708	Form 4
2025-03-13	ACMR	Sale	36,481 @ $27.29	$996K	−5.1% of holding	673,727	Form 4
2025-03-13	ACMR	Sale	1,019 @ $27.65	$28K	−0.2% of holding	672,708	Form 4
2025-03-12	ACMR	Sale	37,500 @ $27.42	$1.0M	−5.0% of holding	710,208	Form 4
2025-03-11	ACMR	Sale	56,250 @ $26.57	$1.5M	−7.0% of holding	747,708	Form 4

32 award / exercise / gift records — not counted as purchases

Date	Company	Action	Shares	Owned after	Filing
2026-09-09	ACMR	Option exercise	70,000	872,708	Form 4
2026-09-09	ACMR	Option exercise	70,000	130,000	Form 4
2026-09-08	ACMR	Option exercise	70,000	872,708	Form 4
2026-09-08	ACMR	Option exercise	70,000	200,000	Form 4
2026-06-04	ACMR	Option exercise	40,002	842,710	Form 4
2026-06-04	ACMR	Option exercise	40,002	270,000	Form 4
2026-06-03	ACMR	Option exercise	60,000	862,708	Form 4
2026-06-03	ACMR	Option exercise	60,000	310,002	Form 4
2026-05-13	ACMR	Award / grant	6,208	6,208	Form 4
2026-03-12	ACMR	Option exercise	50,000	852,708	Form 4
2026-03-12	ACMR	Option exercise	50,000	370,002	Form 4
2026-03-11	ACMR	Option exercise	60,000	862,708	Form 4
2026-03-11	ACMR	Option exercise	60,000	420,002	Form 4
2026-02-04	ACMR	Award / grant	545,400	1,636,197	Form 4
2025-12-04	ACMR	Option exercise	60,000	862,708	Form 4
2025-12-04	ACMR	Option exercise	60,000	480,002	Form 4
2025-12-03	ACMR	Option exercise	70,000	872,708	Form 4
2025-12-03	ACMR	Option exercise	70,000	540,002	Form 4
2025-10-27	ACMR	Award / grant	545,400	545,400	Form 4
2025-09-08	ACMR	Option exercise	130,000	802,708	Form 4
2025-09-08	ACMR	Option exercise	130,000	610,002	Form 4
2025-09-04	ACMR	Option exercise	60,000	732,708	Form 4
2025-09-04	ACMR	Option exercise	60,000	740,002	Form 4
2025-09-03	ACMR	Option exercise	70,000	742,708	Form 4
2025-09-03	ACMR	Option exercise	70,000	800,002	Form 4
2025-05-22	ACMR	Option exercise	60,000	732,708	Form 4
2025-05-22	ACMR	Option exercise	60,000	870,002	Form 4
2025-05-21	ACMR	Option exercise	70,000	742,708	Form 4
2025-05-21	ACMR	Option exercise	70,000	930,002	Form 4
2025-03-03	ACMR	Withheld for tax	4,048	803,958	Form 4
2025-03-03	ACMR	Option exercise	210,000	808,006	Form 4
2025-03-03	ACMR	Option exercise	210,000	0	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.