Stocks/Funds/CIK 1103646

CSS LLC/IL

index-like (500+ pos)long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1103646
Assets
$794M
+38.1% YoY
Holdings
637
Lifetime alpha vs market
+9.63% annual
Average hold time
2.1 yr
median 1.3 yr

Quarterly history

Cum return +320% vs S&P +126% · α +194% lifetimeAUM $794M · peak $1.4BFlow $80M (+12%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-14.68%
trims when stocks drop
when a holding falls −10%+
Middle response
+0.93%
steady accumulation
Rally response
-24.11%
trims into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
$27M3.4%0.3 yr
RSPInvesco S&P 500 Equal We$20M2.5%2.5 yr
VOOVanguard S&P 500 ETF$19M2.4%2.5 yr
$18M2.3%2.0 yr
$18M2.3%0.5 yr
IAUiShares Gold Trust$18M2.2%2.5 yr
APO-PAApollo Global Management$16M2.1%1.8 yr
KIM-PNKimco Realty Corporation$14M1.8%2.3 yr
BAC-PLBank of America Corporat$12M1.6%1.5 yr
PENPenumbra, Inc.$12M1.5%+22.8%0.3 yr
EP-PCEl Paso Energy Capital T$12M1.5%1.8 yr
HOLXHologic, Inc.$9M1.1%+22.4%2.5 yr
SPE-PCSpecial Opportunities Fu$9M1.1%4.3 yr
STEWSRH Total Return Fund, I$8M1.0%10.5 yr
$7M0.9%1.3 yr

Portfolio composition (YoY)

Industry mix
Asset Management25.3%-6.5pp$201M
Unknown18.6%+15.2pp$147M
Shell Companies7.1%+5.1pp$56M
Financial - Conglomerates2.5%$20M
Biotechnology2.2%+1.5pp$17M
Medical - Devices2.0%+0.7pp$16M
Banks - Diversified1.9%+0.9pp$15M
REIT - Retail1.9%-1.3pp$15M
Oil & Gas Exploration & Production1.8%-3.2pp$15M
Computer Hardware1.5%+0.4pp$12M
Country
US77.0%-14.6pp
Unknown18.5%+15.1pp
KY1.2%
GB0.9%-0.4pp
BM0.5%+0.2pp
IE0.4%-0.1pp
IL0.3%+0.1pp
CA0.2%-0.6pp
Top 5: 12.9% · Top 10: 22.0% · Top 25: 35.5%

Winners

TickerPrev $PnLYoY %
WDC$1M+0.00B571.9%
HOLX$0M+0.00B22.4%

Losers

TickerPrev $PnLYoY %

Top buys this quarter · 15

PEN Penumbra, Inc.new+$12M
HOLX Hologic, Inc.+$8M
IRHO Iron Horse Acquisitions II Cornew+$7M
IONS Ionis Pharmaceuticals, Inc.+$5M
MESH Meshflow Acquisition Corp.new+$4M
MEVO M Evo Global Acquisition Corp new+$3M
DBCA D. Boral Acquisition I Corp. Cnew+$2M
SM SM Energy Company+$2M
BDCI BTC Development Corp. Class A new+$2M
SVIV Spring Valley Acquisition Corpnew+$2M

Top sells this quarter · 15

DMII Drugs Made In America Acquisit$7M
SPY State Street SPDR S&P 500 ETF exit$7M
AAOI Applied Optoelectronics, Inc.$6M
SOFI SoFi Technologies, Inc.exit$6M
EXE Expand Energy Corporation$4M
WDC Western Digital Corporation$7M
RKLB Rocket Lab USA, Inc.$3M
SMTC Semtech Corporationexit$3M
BE Bloom Energy Corporation$3M
ULTA Ulta Beauty, Inc.$3M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$794M637+33.34%+17.59%+15.75%+0.08B
2025-12-31$691M636+24.07%+17.72%+6.35%-0.03B
2025-09-30$682M592+27.45%+17.52%+9.93%-0.11B
2025-06-30$722M580+15.32%+14.94%+0.38%+0.08B
2025-03-31$575M544+1.23%+8.30%-7.07%-0.14B
2024-12-31$745M538+13.55%+24.89%-11.33%+0.00B
2024-09-30$681M491+8.25%+36.04%-27.79%+0.17B
2024-06-30$521M487+15.34%+24.49%-9.15%+0.07B
2024-03-31$460M480+22.68%+29.62%-6.94%-0.06B
2023-12-31$479M443+10.45%+26.18%-15.73%-0.01B
2023-09-30$468M484+19.90%+21.57%-1.67%-0.12B
2023-06-30$559M522+9.76%+19.42%-9.66%-0.08B
2023-03-31$620M484-8.60%-7.82%-0.78%-0.26B
2022-12-31$909M614-8.04%-18.17%+10.13%-0.33B
2022-09-30$1.10B676-9.53%-15.51%+5.97%-0.18B
2022-06-30$1.32B731-5.72%-10.62%+4.90%+0.10B