SIMPLEX TRADING, LLC
"13F equity value" = market value of this filer's US-listed long equity positions only. It excludes cash, bonds, non-US and short positions, so it understates a fund's true assets under management — often by a lot.
13F holdings are disclosed ~45 days after quarter-end, and they never reveal when within the quarter a fund actually bought. So any 13F-based summary is structurally late and blurred — this applies to every fund, including this one.
We backtested copying it anyway. Buying this fund's new positions the day each filing went public, over 31 quarters, returned +3.6% per quarter — versus +3.3% per quarter from simply owning every 13F stock. It beat that baseline in only 64.5% of quarters (excess t = 0.18, not statistically significant). Its filings tell you what it bought — not what you should buy.
Quarterly compounding, invested quarters only · entry 47 days after quarter-end (when 13F data becomes public)
Top 20 holdings of 2613 · 2026 Q1
| Ticker | Value | Weight | QoQ |
|---|---|---|---|
| NVDA | $263M | | ADD |
| AMZN | $159M | | NEW |
| SPY | $132M | | ADD |
| META | $132M | | ADD |
| TSM | $119M | | NEW |
| GLD | $99M | | NEW |
| GOOGL | $85M | | ADD |
| UNH | $78M | | ADD |
| ORCL | $76M | | ADD |
| AMD | $53M | | ADD |
| TLT | $53M | | NEW |
| MSFT | $51M | | ADD |
| USO | $42M | | NEW |
| GOOG | $42M | | ADD |
| SOXX | $38M | | TRIM |
| LITE | $37M | | ADD |
| SMH | $36M | | ADD |
| PFE | $36M | | TRIM |
| PLTR | $34M | | ADD |
| INTC | $33M | | TRIM |
QoQ vs previous quarter's share count · NEW = new position · ADD/TRIM = ±2% shares · HOLD = unchanged.
New positions in 2026 Q1
Method & Limitations
Method: a "new position" = held this quarter, absent last quarter (options excluded; stocks with <50 prior holders excluded to filter spin-off artifacts). Entry 47 days after quarter-end — the first day the public could act on the filing. Benchmark = equal-weighted universe of all 13F-held stocks. Limitations: quarterly snapshots can't see intra-quarter trades; survivorship bias — funds that shut down are absent, which flatters the sample. Statistics, not advice.