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SIMO SEC Filing News — Silicon Motion Technology Corporation

Latest SEC filings for Silicon Motion Technology Corporation (SIMO) explained in plain English: insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). Sourced directly from SEC EDGAR.

What you’re looking at: Each item below is parsed from an actual SEC filing. Form 4 = confirmed insider transaction · Form 144 = proposed sale notice · 8-K = material event (earnings, M&A, leadership change, etc.) · 10-Q / 10-K = quarterly / annual report.
Form 144 Proposed Insider Sale 2026-05-27

SIMO Form 144 filed for proposed insider sale by Fan Robert C (500 shares) ~$272.4K

Fan Robert C filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Fan Robert C Shares: 500 Est. Value: $272.4K
Form 144 Proposed Insider Sale 2026-05-27

SIMO Form 144 filed for proposed insider sale by SHIEH HAN-PING (2,000 shares) ~$1.10M

SHIEH HAN-PING filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: SHIEH HAN-PING Shares: 2,000 Est. Value: $1.10M
Form 144 Proposed Insider Sale 2026-05-18

SIMO Form 144 filed for proposed insider sale by Fan Robert C (1,100 shares) ~$451.4K

Fan Robert C filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Fan Robert C Shares: 1,100 Est. Value: $451.4K
Form 4 Insider Selling 2026-05-07

SIMO insider DUANN SHII TYNG (Director) sold 1,500 shares (~$367.5K)

DUANN SHII TYNG, listed as Director at Silicon Motion Technology CORP, reported an open-market sale of 1,500 SIMO shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

Filing: Form 4 (Insider Transaction) Insider: DUANN SHII TYNG (Director) Shares: 1,500 Est. Value: $367.5K
Form 144 Proposed Insider Sale 2026-05-01

SIMO Form 144 filed for proposed insider sale by DUANN SHII TYNG (1,500 shares) ~$657.0K

DUANN SHII TYNG filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: DUANN SHII TYNG Shares: 1,500 Est. Value: $657.0K
Form 144 Proposed Insider Sale 2026-02-24

SIMO Form 144 filed for proposed insider sale by Fan Robert (2,000 shares) ~$541.6K

Fan Robert filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Fan Robert Shares: 2,000 Est. Value: $541.6K
Form 144 Proposed Insider Sale 2025-12-09

SIMO Form 144 filed for proposed insider sale by Fan Robert (3,000 shares) ~$542.7K

Fan Robert filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Fan Robert Shares: 3,000 Est. Value: $542.7K
Form 144 Proposed Insider Sale 2025-11-10

SIMO Form 144 filed for proposed insider sale by DUANN SHII TYNG (1,000 shares) ~$190.0K

DUANN SHII TYNG filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: DUANN SHII TYNG Shares: 1,000 Est. Value: $190.0K
Form 144 Proposed Insider Sale 2025-09-16

SIMO Form 144 filed for proposed insider sale by LIN KUAN-MING (12,500 shares) ~$2.25M

LIN KUAN-MING filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: LIN KUAN-MING Shares: 12,500 Est. Value: $2.25M
Form 144 Proposed Insider Sale 2025-09-09

SIMO Form 144 filed for proposed insider sale by SHIEH HAN-PING (6,000 shares) ~$1.02M

SHIEH HAN-PING filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: SHIEH HAN-PING Shares: 6,000 Est. Value: $1.02M
Form 144 Proposed Insider Sale 2025-08-12

SIMO Form 144 filed for proposed insider sale by SHIEH HAN-PING (6,000 shares) ~$916.6K

SHIEH HAN-PING filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: SHIEH HAN-PING Shares: 6,000 Est. Value: $916.6K
Form 144 Proposed Insider Sale 2025-06-25

SIMO Form 144 filed for proposed insider sale by SHIEH HAN-PING (2,000 shares) ~$288.0K

SHIEH HAN-PING filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: SHIEH HAN-PING Shares: 2,000 Est. Value: $288.0K
Form 144 Proposed Insider Sale 2025-05-12

SIMO Form 144 filed for proposed insider sale by DUANN SHII TYNG (4,000 shares) ~$428.3K

DUANN SHII TYNG filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: DUANN SHII TYNG Shares: 4,000 Est. Value: $428.3K
Form 144 Proposed Insider Sale 2024-12-18

SIMO Form 144 filed for proposed insider sale by Fan Robert (1,000 shares) ~$120.6K

Fan Robert filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Fan Robert Shares: 1,000 Est. Value: $120.6K
Form 144 Proposed Insider Sale 2024-12-03

SIMO Form 144 filed for proposed insider sale by DUANN SHII TYNG (3,000 shares) ~$324.0K

DUANN SHII TYNG filed a Form 144 with the SEC indicating intent to sell SIMO (Silicon Motion Technology CORP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: DUANN SHII TYNG Shares: 3,000 Est. Value: $324.0K
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