Stocks/Funds/CIK 1488542

SIMPLEX TRADING, LLC

index-like (500+ pos)long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1488542
Assets
$3.23B
+14.6% YoY
Holdings
2,612
Lifetime alpha vs market
+10.59% annual
Average hold time
2.5 yr
median 2.5 yr

Quarterly history

Cum return +248% vs S&P +90% · α +158% lifetimeAUM $3.2B · peak $4.5BFlow $-326M (-9%)2015-122017-032018-062021-122023-032024-062025-092026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-19.26%
trims when stocks drop
when a holding falls −10%+
Middle response
-21.35%
baseline attrition
Rally response
-34.65%
trims into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
NVDANVIDIA Corporation$263M8.1%+60.9%7.0 yr
AMZNAmazon.com, Inc.$159M4.9%+9.5%5.0 yr
SPYState Street SPDR S&P 50$132M4.1%+17.6%3.3 yr
METAMeta Platforms, Inc.$132M4.1%-0.4%6.3 yr
TSMTaiwan Semiconductor Man$119M3.7%+105.6%5.3 yr
GLDSPDR Gold Shares$99M3.1%4.3 yr
GOOGLAlphabet Inc.$85M2.6%6.3 yr
UNHUnitedHealth Group Incor$78M2.4%-46.9%3.8 yr
ORCLOracle Corporation$76M2.3%+5.9%4.8 yr
AMDAdvanced Micro Devices, $53M1.6%+98.0%6.0 yr
TLTiShares 20+ Year Treasur$53M1.6%4.0 yr
MSFTMicrosoft Corporation$51M1.6%-0.6%3.8 yr
USOUnited States Oil Fund L$42M1.3%3.5 yr
GOOGAlphabet Inc.$42M1.3%+84.3%5.5 yr
SOXXiShares Semiconductor ET$38M1.2%2.0 yr

Portfolio composition (YoY)

Industry mix
Semiconductors17.6%+3.9pp$569M
Asset Management17.0%+8.4pp$549M
Internet Content & Information8.5%+2.8pp$275M
Software - Infrastructure6.2%+4.7pp$199M
Specialty Retail5.8%+2.3pp$186M
Medical - Healthcare Plans3.6%+0.6pp$118M
Asset Management - Bonds2.5%-7.3pp$82M
Biotechnology2.4%+0.2pp$77M
Unknown1.5%-0.5pp$49M
Drug Manufacturers - General1.4%-0.6pp$46M
Country
US85.9%+2.1pp
TW3.7%+0.9pp
CA2.4%+0.9pp
Unknown1.5%-0.5pp
NL1.0%+0.7pp
IL0.8%-0.4pp
GB0.7%-1.0pp
CN0.7%-2.0pp
Top 5: 24.9% · Top 10: 37.0% · Top 25: 53.2%

Winners

TickerPrev $PnLYoY %
TSM$80M+0.08B105.6%
NVDA$121M+0.07B60.9%
INTC$77M+0.07B94.3%
GOOG$12M+0.01B84.3%
LITE$1M+0.01B1027.3%

Losers

TickerPrev $PnLYoY %
UNH$19M-0.01B-46.9%
NKE$34M-0.00B-14.7%
CI$26M-0.00B-17.2%
MSFT$14M-0.00B-0.6%

Top buys this quarter · 15

NVDA NVIDIA Corporation+$134M
META Meta Platforms, Inc.+$96M
TSM Taiwan Semiconductor Manufactu+$79M
SPY State Street SPDR S&P 500 ETF +$75M
AMZN Amazon.com, Inc.+$62M
ORCL Oracle Corporation+$56M
UNH UnitedHealth Group Incorporate+$53M
AMD Advanced Micro Devices, Inc.+$42M
GOOG Alphabet Inc.+$28M
LITE Lumentum Holdings Inc.+$25M

Top sells this quarter · 15

AAPL Apple Inc.$170M
WDC Western Digital Corporation$91M
AVGO Broadcom Inc.$58M
NFLX Netflix, Inc.$49M
SNDK Sandisk Corporation$41M
BE Bloom Energy Corporationexit$41M
VRT Vertiv Holdings Coexit$38M
TSLA Tesla, Inc.$37M
ASTS AST SpaceMobile, Inc.$30M
NEE NextEra Energy, Inc.exit$27M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$3.23B2612+39.35%+17.59%+21.76%-0.33B
2025-12-31$3.56B2446+34.38%+17.72%+16.66%-1.20B
2025-09-30$4.53B2494+33.04%+17.52%+15.52%+0.27B
2025-06-30$3.72B2289+16.53%+14.94%+1.59%+0.46B
2025-03-31$2.82B2243+3.70%+8.30%-4.60%-0.60B
2024-12-31$3.55B2305+13.77%+24.89%-11.12%+0.47B
2024-09-30$2.97B2139+22.82%+36.04%-13.21%-0.16B
2024-06-30$3.11B2253+28.18%+24.49%+3.69%-0.42B
2024-03-31$3.43B2225+35.25%+29.62%+5.63%+0.03B
2023-12-31$3.21B2261+37.45%+26.18%+11.27%+0.15B
2023-09-30$2.73B2122+20.96%+21.57%-0.61%+0.26B
2023-06-30$2.35B2234+2.10%+19.42%-17.33%-0.04B
2023-03-31$2.21B2176-30.51%-7.82%-22.69%-0.04B
2022-12-31$2.09B2366-31.16%-18.17%-12.99%-0.46B
2022-09-30$2.58B2569-11.40%-4.93%-6.47%-0.11B
2022-06-30$3.04B2482-26.12%-16.11%-10.01%+0.71B