LINDEN ADVISORS LP
"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 28 quarters, returned +2.1% per quarter — versus +3.1% per quarter from simply owning every 13F stock. It beat that baseline in only 42.9% of quarters (excess t = 0.88, 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 563 · 2026 Q1
| Ticker | Value | Weight | QoQ |
|---|---|---|---|
| LITE | $1.5B | | HOLD |
| LITE | $944M | | HOLD |
| LITE | $595M | | TRIM |
| MKSI | $330M | | TRIM |
| U | $276M | | NEW |
| BBIO | $268M | | ADD |
| FWONA | $258M | | HOLD |
| MSTR | $245M | | ADD |
| ITGR | $244M | | NEW |
| AFRM | $243M | | HOLD |
| SEI | $242M | | ADD |
| VSH | $228M | | ADD |
| BBIO | $225M | | NEW |
| MSTR | $210M | | TRIM |
| ASND | $205M | | HOLD |
| BILL | $199M | | TRIM |
| GH | $195M | | ADD |
| CLSK | $186M | | TRIM |
| HAE | $181M | | TRIM |
| OSIS | $175M | | HOLD |
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.