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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
FXY icon
9626
Invesco CurrencyShares Japanese Yen Trust
FXY
$446M
– –
-513
Closed -$29.5K
GAIA icon
9627
PUT
Gaia
GAIA
$40.7M
– –
-3,900
Closed -$10.8K
GANX icon
9628
Gain Therapeutics
GANX
$78.6M
– –
-13,439
Closed -$24.8K
GASS icon
9629
PUT
StealthGas
GASS
$350M
– –
-700
Closed -$6.42K
GATX icon
9630
GATX Corp
GATX
$6.29B
– –
-503
Closed -$91.6K
GATX icon
9631
PUT
GATX Corp
GATX
$6.29B
– –
-800
Closed -$137K
GAU
9632
Galiano Gold
GAU
$594M
– –
-8,876
Closed -$20.6K
GBX icon
9633
The Greenbrier Companies
GBX
$1.34B
– –
-16
Closed -$787
TDAY
9634
USA Today Co
TDAY
$929M
– –
-1,995
Closed -$15.1K
GCMG icon
9635
CALL
GCM Grosvenor
GCMG
$811M
– –
-200
Closed -$1.96K
GCT icon
9636
GigaCloud Technology
GCT
$1.85B
– –
-303
Closed -$11.9K
GDDY icon
9637
GoDaddy
GDDY
$12.8B
– –
-3,240
Closed -$273K
GDEN
9638
DELISTED
Golden Entertainment
GDEN
– –
-548
Closed -$14.6K
GDEN
9639
PUT
DELISTED
Golden Entertainment
GDEN
– –
-100
Closed -$2.67K
GEF icon
9640
PUT
Greif
GEF
$4.83B
– –
-100
Closed -$6.71K
GENC icon
9641
CALL
Gencor Industries
GENC
$270M
– –
-1,900
Closed -$28.5K
GEO icon
9642
The GEO Group
GEO
$4.18B
– –
-27,236
Closed -$617K
GFL icon
9643
GFL Environmental
GFL
$19.1B
– –
-48
Closed -$1.81K
GGB icon
9644
Gerdau
GGB
$9.75B
– –
-9,302
Closed -$41.3K
GGLS icon
9645
Direxion Daily GOOGL Bear 1X ETF
GGLS
$12.1M
– –
-10
Closed -$729
GHI icon
9646
PUT
Greystone Housing Impact Investors LP
GHI
$152M
– –
-600
Closed -$2.95K
GKOS icon
9647
Glaukos
GKOS
$10.5B
– –
-1,613
Closed -$204K
GLBS icon
9648
Globus Maritime Ltd
GLBS
$79.6M
– –
-436
Closed -$978
GLDD
9649
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
– –
-21,400
Closed -$364K
GLDD
9650
PUT
DELISTED
Great Lakes Dredge & Dock
GLDD
– –
-1,100
Closed -$18.7K
384 385
386
387 388

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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.