CastleKnight Management LP: SILICON MOTION TECHNOLOGY CO (SIMO): Quarterly 13F Position History
As of Q1 2026, CastleKnight Management LP reported 323,475 shares of SILICON MOTION TECHNOLOGY CO (SIMO), worth $36.3M and representing 1.7% of its 13F equity book. Quarter-over-quarter share count change: + 241,239 (+293.3%) . The position first appeared in Q3 2023 and has been disclosed across 11 13F-HR filings in Pactolio's tracked window.
- 323,475Shares Held (Latest Filing)
- $36.3MReported Market Value (Latest Filing)
- 1.7%Portfolio Weight (% of 13F Equity Book)
- +241,239Quarter-over-Quarter Share Change
- +$28.7MQuarter-over-Quarter Value Change
- 323,475Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 11 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 323,475 | +241,239 | +293.3% | $36.3M | 1.7% | $112.3 |
| Q4 2025 | 82,236 | +82,236 | — | $7.6M | 0.4% | $92.7 |
| Q3 2025 | 0 | 0 | — | $0 | 0.0% | — |
| Q2 2025 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2025 | 0 | 4,924 | -100.0% | $0 | 0.0% | — |
| Q4 2024 | 4,924 | 19,400 | -79.8% | $266.1K | 0.0% | $54.0 |
| Q3 2024 | 24,324 | 88,676 | -78.5% | $1.5M | 0.2% | $60.7 |
| Q2 2024 | 113,000 | 46,075 | -29.0% | $9.2M | 1.2% | $81.0 |
| Q1 2024 | 159,075 | 8,000 | -4.8% | $12.2M | 1.8% | $76.9 |
| Q4 2023 | 167,075 | +53,875 | +47.6% | $10.2M | 1.6% | $61.3 |
| Q3 2023 | 113,200 | — | — | $5.8M | 1.0% | $51.3 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did CastleKnight Management LP first disclose a SIMO position in 13F-HR filings?
CastleKnight Management LP first reported SILICON MOTION TECHNOLOGY CO (SIMO) on its 13F-HR filing for the period ending 2023-09-30 (Q3 2023). The position has appeared on 11 reported quarters within Pactolio's tracked window.
What was CastleKnight Management LP's most recent quarter-over-quarter share-count change in SIMO?
Between Q4 2025 and Q1 2026, CastleKnight Management LP added 241,239 shares of SIMO (+293.3%), bringing the total reported position to 323,475 shares at a market value of $36.3M.
Does the implied price-per-share represent CastleKnight Management LP's cost basis in SIMO?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.