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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
MCS icon
9901
Marcus Corp
MCS
$841M
– –
-50
Closed -$983
MCW
9902
CALL
DELISTED
Mister Car Wash
MCW
– –
-7,400
Closed -$51.6K
MCW
9903
PUT
DELISTED
Mister Car Wash
MCW
– –
-2,900
Closed -$20.2K
MD icon
9904
CALL
Pediatrix Medical
MD
$2.2B
– –
-100
Closed -$2.14K
MD icon
9905
Pediatrix Medical
MD
$2.2B
– –
-131
Closed -$2.8K
MDT icon
9906
Medtronic
MDT
$120B
– –
-4,575
Closed -$369K
MDU icon
9907
PUT
MDU Resources
MDU
$4.12B
– –
-5,200
Closed -$108K
LITS
9908
PUT
Lite Strategy Inc
LITS
$38.8M
– –
-100
Closed -$115
MFA
9909
MFA Financial
MFA
$905M
– –
-53,626
Closed -$520K
CD
9910
PUT
Chaince Digital Holdings
CD
$448M
– –
-500
Closed -$1.99K
MGC icon
9911
Vanguard Morningstar Mega Cap ETF
MGC
$10.4B
– –
-955
Closed -$226K
MGNI icon
9912
Magnite
MGNI
$3.46B
– –
-11,316
Closed -$162K
MISL icon
9913
First Trust Indxx Aerospace & Defense ETF
MISL
$729M
– –
-45
Closed -$2.01K
MITT
9914
TPG Mortgage Investment Trust
MITT
$216M
– –
-509
Closed -$3.98K
MJ icon
9915
Amplify Alternative Harvest ETF
MJ
$114M
– –
-120
Closed -$2.76K
MKL icon
9916
Markel Group
MKL
$22.6B
– –
-274
Closed -$512K
MLI icon
9917
Mueller Industries
MLI
$14.1B
– –
-134
Closed -$8.79K
MLPX icon
9918
Global X MLP & Energy Infrastructure ETF
MLPX
$3.65B
– –
-145
Closed -$10.7K
MLR icon
9919
Miller Industries
MLR
$636M
– –
-110
Closed -$5.01K
MMS icon
9920
CALL
Maximus
MMS
$3.02B
– –
-21,000
Closed -$1.35M
MMYT icon
9921
MakeMyTrip
MMYT
$5.23B
– –
-36,713
Closed -$1.67M
MNRO icon
9922
Monro
MNRO
$415M
– –
-62
Closed -$1.01K
MNY icon
9923
MoneyHero
MNY
$37.9M
– –
-5,573
Closed -$7.13K
MORT icon
9924
VanEck Mortgage REIT Income ETF
MORT
$364M
– –
-985
Closed -$10.1K
MOV icon
9925
PUT
Movado Group
MOV
$758M
– –
-1,000
Closed -$24.4K
395 396
397
398 399

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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.