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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

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
+21.82%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$175B
AUM Growth
+$18.5B
Cap. Flow
-$10.5B
Cap. Flow %
-6.03%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,525
Increased
3,308
Reduced
3,590
Closed
1,431

Top Buys

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$172M
2
AAPL icon
Apple
AAPL
+$156M
3
AVGO icon
Broadcom
AVGO
+$101M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$57.2M
5
UNH icon
UnitedHealth
UNH
+$55.1M

Top Sells

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$140M
2
AMZN icon
Amazon
AMZN
+$47.9M
3
NFLX icon
Netflix
NFLX
+$38.3M
4
TSM icon
TSMC
TSM
+$37.3M
5
PFE icon
Pfizer
PFE
+$36.9M

Sector Composition

Rank Sector Weight
1 Technology 0.74%
2 Communication Services 0.19%
3 Consumer Discretionary 0.18%
4 Healthcare 0.17%
5 Financials 0.14%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VLTO icon
9826
Veralto
VLTO
$22.2B
– –
-2,296
Closed -$222K
VMI icon
9827
CALL
Valmont Industries
VMI
$9.5B
– –
-200
Closed -$57K
VNRX icon
9828
VolitionRx Ltd
VNRX
$12.5M
$0 ﹤0.01%
32
+5
+19% +$55
VNT icon
9829
Vontier
VNT
$4.23B
– –
-155
Closed -$5.28K
VOD icon
9830
Vodafone
VOD
$35.8B
– –
-49,605
Closed -$480K
VOOG icon
9831
Vanguard S&P 500 Growth ETF
VOOG
$26.1B
– –
-4,782
Closed -$285K
VOR icon
9832
Vor Biopharma
VOR
$1.04B
– –
-348
Closed -$3.08K
VOYA icon
9833
Voya Financial
VOYA
$8.94B
– –
-3,518
Closed -$226K
VPG icon
9834
Vishay Precision Group
VPG
$1.5B
– –
-19,121
Closed -$471K
GGRP
9835
Glimpse Group
GGRP
$18.8M
$0 ﹤0.01%
159
-8,147
-98% -$10.4K
VRCA icon
9836
Verrica Pharmaceuticals
VRCA
$94.5M
– –
-156
Closed –
VRDN icon
9837
Viridian Therapeutics
VRDN
$2.08B
– –
-8,412
Closed -$114K
VREX icon
9838
CALL
Varex Imaging
VREX
$449M
– –
-400
Closed -$4K
VRNS icon
9839
Varonis Systems
VRNS
$5.2B
– –
-23,621
Closed -$1.07M
VRRM icon
9840
PUT
Verra Mobility
VRRM
$624M
– –
-200
Closed -$4K
VSEC icon
9841
PUT
VSE Corp
VSEC
$5.53B
– –
-100
Closed -$11K
VST icon
9842
Vistra
VST
$56.1B
– –
-29,711
Closed -$4.4M
VTLE
9843
DELISTED
Vital Energy
VTLE
– –
-16,818
Closed -$275K
VTOL icon
9844
Bristow Group
VTOL
$1.34B
– –
-81
Closed -$2.44K
VTWV icon
9845
Vanguard Russell 2000 Value ETF
VTWV
$1.29B
– –
-39
Closed -$5K
VVX icon
9846
PUT
V2X
VVX
$2.53B
– –
-800
Closed -$39K
VXRT
9847
PUT
DELISTED
Vaxart
VXRT
– –
-14,600
Closed -$5K
VYGR icon
9848
Voyager Therapeutics
VYGR
$187M
$0 ﹤0.01%
280
-2,413
-90% -$7.78K
W icon
9849
Wayfair
W
$11.2B
– –
-4,550
Closed -$170K
WBX
9850
Wallbox
WBX
$94.1M
– –
-6
Closed –
392 393
394
395 396

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Simplex Trading's Q2 2025 Portfolio in Review

As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.

Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.

  • Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
  • Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
  • Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
  • Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
  • Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
  • Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
  • Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.

Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.