CASTLEARK MANAGEMENT LLC

13F equity value

$3.0B

Positions

292

Top 10 concentration

32.2%

Quarters / total new picks

32 / 1,271

13F equity value over time

"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.

Not significant Verdict

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 32 quarters, returned +2.5% per quarter — versus +2.7% per quarter from simply owning every 13F stock. It beat that baseline in only 46.9% of quarters (excess t = 1.51, not statistically significant). Its filings tell you what it bought — not what you should buy.

Avg 2Q excess

+2.1%

t-stat

1.51

Quarterly win rate

47%

Annualized excess

-1.8%

$1 → follow vs universe

$1.82 vs $2.09

Cumulative return: $1 invested in new picks vs universe

Quarterly compounding, invested quarters only · entry 47 days after quarter-end (when 13F data becomes public)

Listed as facts. See the verdict above before treating this as signal.

Top 20 holdings of 292 · 2026 Q1

Ticker	Value	Weight	QoQ
NVDA	$219M	7.3%	TRIM
GOOGL	$120M	4.0%	ADD
MSFT	$98M	3.2%	TRIM
SPIB	$90M	3.0%	ADD
AAPL	$89M	2.9%	TRIM
GOVT	$76M	2.5%	HOLD
LRCX	$72M	2.4%	TRIM
META	$71M	2.4%	HOLD
VMBS	$70M	2.3%	TRIM
LLY	$68M	2.2%	TRIM
AVGO	$63M	2.1%	HOLD
ANET	$53M	1.8%	ADD
AMZN	$51M	1.7%	TRIM
GILD	$48M	1.6%	ADD
SCHW	$47M	1.6%	TRIM
V	$46M	1.5%	TRIM
MA	$46M	1.5%	TRIM
SPTS	$39M	1.3%	HOLD
SHOP	$37M	1.2%	TRIM
GEV	$36M	1.2%	TRIM

QoQ vs previous quarter's share count · NEW = new position · ADD/TRIM = ±2% shares · HOLD = unchanged.

Listed as facts. See the verdict above before treating this as signal.

New positions in 2026 Q1

AAOI ADSK ALGM ALSN ATMU BC BKD CDE CF CGNX COGT CVX ENVA FANG FIGS FROG FSLY GWW HQY IQV IREN JAZZ KLIC KNX LASR LBRT LINC MANH MCO MPC

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.