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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
Cap. Flow
-$29.5M
Cap. Flow %
-0.02%
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$146M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$108M
3
AAPL icon
Apple
AAPL
+$62.9M
4
TSLA icon
Tesla
TSLA
+$51.9M
5
MU icon
Micron Technology
MU
+$39.5M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$108M
2
META icon
Meta Platforms (Facebook)
META
+$104M
3
AMD icon
Advanced Micro Devices
AMD
+$92.1M
4
AMZN icon
Amazon
AMZN
+$90.3M
5
TSM icon
TSMC
TSM
+$82.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.28%
2 Technology 0.76%
3 Consumer Discretionary 0.21%
4 Communication Services 0.19%
5 Healthcare 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ALSN icon
9201
Allison Transmission
ALSN
$10.8B
– –
-1,285
Closed -$156K
ALT icon
9202
Altimmune
ALT
$665M
– –
-22,841
Closed -$68.2K
ALTI icon
9203
AlTi Global
ALTI
$345M
– –
-10,056
Closed -$36.4K
AM icon
9204
Antero Midstream
AM
$10.7B
– –
-12,653
Closed -$275K
OSG
9205
Octave Specialty Group
OSG
$224M
– –
-9,458
Closed -$44K
AMCX icon
9206
PUT
AMC Global Media
AMCX
$515M
– –
-10,100
Closed -$68.6K
AME icon
9207
Ametek
AME
$54.5B
– –
-10,908
Closed -$2.51M
AMLP icon
9208
Alerian MLP ETF
AMLP
$13.5B
– –
-15,637
Closed -$823K
AMP icon
9209
Ameriprise Financial
AMP
$49.5B
– –
-286
Closed -$131K
AMP icon
9210
PUT
Ameriprise Financial
AMP
$49.5B
– –
-900
Closed -$400K
AMPH icon
9211
Amphastar Pharmaceuticals
AMPH
$986M
– –
-262
Closed -$5.29K
AMPH icon
9212
PUT
Amphastar Pharmaceuticals
AMPH
$986M
– –
-1,700
Closed -$33.3K
GOLD
9213
Gold.com Inc
GOLD
$1.34B
– –
-4,899
Closed -$211K
AMRX icon
9214
Amneal Pharmaceuticals
AMRX
$6.07B
– –
-693
Closed -$9.5K
AMZP icon
9215
Kurv Yield Premium Strategy Amazon (AMZN) ETF
AMZP
$18.2M
– –
-193
Closed -$4.5K
ANDE icon
9216
Andersons Inc
ANDE
$2.35B
– –
-9,638
Closed -$700K
ANDE icon
9217
PUT
Andersons Inc
ANDE
$2.35B
– –
-100
Closed -$7.18K
ANGL icon
9218
VanEck Fallen Angel High Yield Bond ETF
ANGL
$3.17B
– –
-518
Closed -$14.9K
ANIK icon
9219
Anika Therapeutics
ANIK
$278M
– –
-70
Closed -$1.01K
ANIP icon
9220
ANI Pharmaceuticals
ANIP
$1.64B
– –
-3,459
Closed -$277K
AON icon
9221
Aon
AON
$68.5B
– –
-684
Closed -$221K
AP icon
9222
Ampco-Pittsburgh
AP
$179M
– –
-20,162
Closed -$205K
APD icon
9223
Air Products & Chemicals
APD
$67.1B
– –
-7,958
Closed -$2.31M
API
9224
PUT
Agora
API
$358M
– –
-100
Closed -$354
APLS
9225
CALL
DELISTED
Apellis Pharmaceuticals
APLS
– –
-77,000
Closed -$3.1M
367 368
369
370 371

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Simplex Trading's Q2 2026 Portfolio in Review

As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.

Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
  • Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
  • Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
  • Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
  • Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
  • Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.