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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
VNOM icon
10401
Viper Energy
VNOM
$15.9B
– –
-25,146
Closed -$1.16M
VNQ icon
10402
Vanguard Real Estate ETF
VNQ
$38.1B
– –
-7,047
Closed -$625K
VNQI icon
10403
Vanguard Global ex-US Real Estate ETF
VNQI
$3.49B
– –
-360
Closed -$16K
VOOG icon
10404
Vanguard S&P 500 Growth ETF
VOOG
$27.1B
– –
-2,550
Closed -$202K
VOOV icon
10405
Vanguard S&P 500 Value ETF
VOOV
$6.77B
– –
-2,261
Closed -$461K
VPL icon
10406
Vanguard FTSE Pacific ETF
VPL
$8.79B
– –
-636
Closed -$62.2K
BTLN
10407
PUT
Brightline Interactive
BTLN
$20M
– –
-100
Closed -$51
VRE
10408
CALL
DELISTED
Veris Residential
VRE
– –
-600
Closed -$11.3K
VRE
10409
PUT
DELISTED
Veris Residential
VRE
– –
-1,600
Closed -$30.2K
VRTX icon
10410
Vertex Pharmaceuticals
VRTX
$138B
– –
-1,401
Closed -$621K
VSTS icon
10411
Vestis
VSTS
$1.75B
– –
-99,930
Closed -$1.11M
VTEX icon
10412
CALL
VTEX
VTEX
$597M
– –
-800
Closed -$3.2K
VTEX icon
10413
VTEX
VTEX
$597M
– –
-29
Closed -$116
VTEX icon
10414
PUT
VTEX
VTEX
$597M
– –
-100
Closed -$400
VTOL icon
10415
CALL
Bristow Group
VTOL
$1.28B
– –
-200
Closed -$9.38K
VTOL icon
10416
PUT
Bristow Group
VTOL
$1.28B
– –
-100
Closed -$4.69K
VTRS icon
10417
Viatris
VTRS
$19.4B
– –
-38,221
Closed -$592K
VTSI icon
10418
PUT
VirTra
VTSI
$35M
– –
-500
Closed -$1.85K
VYGR icon
10419
Voyager Therapeutics
VYGR
$216M
– –
-22,261
Closed -$84.4K
VYMI icon
10420
Vanguard International High Dividend Yield ETF
VYMI
$21.8B
– –
-151
Closed -$14.2K
WAB icon
10421
Wabtec
WAB
$47.8B
– –
-2,273
Closed -$601K
WABC icon
10422
PUT
Westamerica Bancorp
WABC
$1.37B
– –
-100
Closed -$5.21K
WASH icon
10423
Washington Trust Bancorp
WASH
$768M
– –
-800
Closed -$26.8K
WDS icon
10424
Woodside Energy
WDS
$43.3B
– –
-27,184
Closed -$606K
WEAV icon
10425
Weave Communications
WEAV
$586M
– –
-250
Closed -$1.36K
415 416
417
418 419

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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.