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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
+21.82%
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
$175B
AUM Growth
+$18.5B
Cap. Flow
+$450M
Cap. Flow %
0.26%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,524
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 Miscellaneous 98.27%
2 Technology 0.74%
3 Communication Services 0.19%
4 Consumer Discretionary 0.18%
5 Healthcare 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CLDL
8751
DELISTED
Direxion Daily Cloud Computing Bull 2X Shares
CLDL
– –
-26
Closed –
CLFD icon
8752
Clearfield
CLFD
$389M
– –
-39
Closed -$1.34K
CLGN icon
8753
CollPlant Biotechnologies
CLGN
$6.71M
$0 ﹤0.01%
+9
New +$186
CLH icon
8754
Clean Harbors
CLH
$16.7B
– –
-942
Closed -$206K
CLIR icon
8755
ClearSign Technologies
CLIR
$26.6M
– –
-39
Closed –
CLPT icon
8756
ClearPoint Neuro
CLPT
$426M
– –
-3,480
Closed -$43.8K
CLS icon
8757
Celestica
CLS
$39.4B
– –
-7,105
Closed -$755K
CLSD
8758
CALL
DELISTED
Clearside Biomedical
CLSD
– –
-273
Closed -$3K
CLSD
8759
DELISTED
Clearside Biomedical
CLSD
$0 ﹤0.01%
+8
New +$99
CMBM
8760
DELISTED
Cambium Networks
CMBM
$0 ﹤0.01%
1,679
-365
-18% -$142
CMBS icon
8761
iShares CMBS ETF
CMBS
$470M
– –
-286
Closed -$13K
CMCL icon
8762
Caledonia Mining Corp
CMCL
$509M
$0 ﹤0.01%
+2
New +$31
CMCO icon
8763
PUT
Columbus McKinnon
CMCO
$544M
– –
-500
Closed -$8K
CMCT
8764
Creative Media & Community Trust
CMCT
$9.67M
– –
0
– –
CMS icon
8765
CMS Energy
CMS
$21.5B
– –
-8,522
Closed -$607K
CMTL icon
8766
CALL
Comtech Telecommunications
CMTL
$46.7M
– –
-6,400
Closed -$10K
CNO icon
8767
CALL
CNO Financial Group
CNO
$5.25B
– –
-100
Closed -$4K
CNO icon
8768
CNO Financial Group
CNO
$5.25B
– –
-1
Closed -$38
CNNE icon
8769
CALL
Cannae Holdings
CNNE
$687M
– –
-500
Closed -$9K
CNNE icon
8770
Cannae Holdings
CNNE
$687M
– –
-198
Closed -$3K
CNNE icon
8771
PUT
Cannae Holdings
CNNE
$687M
– –
-600
Closed -$10K
CNP icon
8772
CenterPoint Energy
CNP
$26.1B
– –
-22,903
Closed -$849K
CNS icon
8773
PUT
Cohen & Steers
CNS
$4.11B
– –
-1,200
Closed -$96K
CNXT icon
8774
VanEck ChiNext Innovators ETF
CNXT
$103M
– –
-3,271
Closed -$90K
COHU icon
8775
PUT
Cohu
COHU
$2.4B
– –
-600
Closed -$8K
349 350
351
352 353

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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's Q2 2025 filing shows 1,524 new, 3,308 increased, 3,590 reduced and 1,431 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $140M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Communication Services.

  • 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 1,524 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.