Who owns Silicon Motion (SIMO)?
124 holders named in SEC filings declare between 57.4% and 74.7% of Silicon Motion's shares outstanding, as of Jun 30, 2026. The largest are Fidelity (FMR) (6.8%), ACADIAN ASSET MANAGEMENT LLC (3.9%) and Invesco (3.4%); the five largest hold 20.4% together. Another 266 institutions hold small positions worth 2.4%. At least 22.9% of the shares appear in no ownership filing: investors who do not have to report, mostly individuals. From Mar 31, 2026 to Jun 30, 2026, institutions that filed both quarters bought 21.5% and sold 27.2% of the shares, a net sale of 5.7%; 141 opened a position, 76 added, 130 reduced and 33 sold out. Biggest buyers: ALKEON CAPITAL MANAGEMENT LLC (+1.1M shares) and Polar Capital Holdings Plc (+931,375 shares). Biggest sellers: Fidelity (FMR) (-1.1M) and LORD, ABBETT & CO. LLC (-584,240). Schedule 13D/G filings since Mar 31, 2026: FMR LLC cut its stake to 6.7% on Jun 30, 2026. Directors and officers, from their latest Form 4: Wallace Chiachang Kou (1.4%) and Pongchi James Chow (1.2%). Over time, 381 managers declared Silicon Motion in their 13F for Q2 2026, against 141 for Q4 2019: together at most 73.9% of the shares outstanding, against 75.8%.
| Holder | Filing | Share of capital | As of | Holding since (13F) |
|---|---|---|---|---|
| Fidelity (FMR) | 13F | 6.8% | Jun 30, 2026 | Q4 2019 or earlier |
| ACADIAN ASSET MANAGEMENT LLC | 13F | 3.9% | Jun 30, 2026 | Q4 2019 or earlier |
| Invesco | 13F | 3.4% | Jun 30, 2026 | Q3 2024 |
| ALKEON CAPITAL MANAGEMENT LLC | 13F | 3.3% | Jun 30, 2026 | Q2 2026 |
| HAWK RIDGE CAPITAL MANAGEMENT LP | 13F | 3.0% | Jun 30, 2026 | Q2 2025 |
| REINHART PARTNERS, LLC. | 13F | 2.9% | Jun 30, 2026 | Q3 2023 |
| Polar Capital Holdings Plc | 13F | 2.8% | Jun 30, 2026 | Q2 2026 |
| Driehaus Capital Management LLC | 13F | 2.3% | Jun 30, 2026 | Q2 2025 |
| Two Sigma | 13F | 2.1% | Jun 30, 2026 | Q4 2019 or earlier |
| Wolf Hill Capital Management, LP | 13F | 1.6% | Jun 30, 2026 | Q4 2025 |
| Wallace Chiachang Kou | Form 4 | 1.4% | Mar 18, 2026 | — |
| Bahl & Gaynor LLC | 13F | 1.4% | Jun 30, 2026 | Q1 2026 |
| Granahan Investment Management, LLC | 13F | 1.3% | Jun 30, 2026 | Q2 2025 |
| LAZARD ASSET MANAGEMENT LLC | 13F | 1.3% | Jun 30, 2026 | Q4 2019 or earlier |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 13F | 1.2% | Jun 30, 2026 | Q2 2025 |
| Pongchi James Chow | Form 4 | 1.2% | Mar 18, 2026 | — |
| LORD, ABBETT & CO. LLC | 13F | 1.1% | Jun 30, 2026 | Q1 2024 |
| D. E. Shaw | 13F | 1.1% | Jun 30, 2026 | Q2 2026 |
| Analog Century Management LP | 13F | 1.1% | Jun 30, 2026 | Q1 2026 |
| SYSTEMATIC FINANCIAL MANAGEMENT LP | 13F | 1.1% | Jun 30, 2026 | Q4 2019 or earlier |
| BIT Capital GmbH | 13F | 1.0% | Jun 30, 2026 | Q2 2026 |
| OBERWEIS ASSET MANAGEMENT INC/ | 13F | 0.94% | Jun 30, 2026 | Q4 2023 |
| Robeco Institutional Asset Management B.V. | 13F | 0.89% | Jun 30, 2026 | Q4 2022 |
| Marshall Wace | 13F | 0.87% | Jun 30, 2026 | Q4 2021 |
| Morgan Stanley | 13F | 0.87% | Jun 30, 2026 | Q4 2019 or earlier |
Silicon Motion institutional ownership over time
| Quarter | 13F managers | Share of the company (upper bound) | Value declared | Held by stock pickers |
|---|---|---|---|---|
| Q4 2019 | 141 | 75.8% | $1.3B | 82.8% |
| Q4 2020 | 159 | 74.8% | $1.2B | 86.3% |
| Q4 2021 | 218 | 76.8% | $2.5B | 91.6% |
| Q4 2022 | 189 | 75.1% | $1.6B | 81.5% |
| Q4 2023 | 200 | 79.9% | $1.6B | 87.0% |
| Q4 2024 | 198 | 80.9% | $1.5B | 88.6% |
| Q4 2025 | 237 | 81.5% | $2.5B | 91.0% |
| Q2 2026 | 381 | 73.9% | $8.3B | 87.5% |
From SEC Form 13F, every quarter since the end of 2019, read like the current quarter: entities of a house summed, a value contradicting its share count set aside. The share of the company is an upper bound — two managers can declare the same shares — over the shares outstanding at that date.