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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
FND icon
8976
Floor & Decor
FND
$5.73B
– –
-16,353
Closed -$1.21M
FOR icon
8977
CALL
Forestar Group
FOR
$1.42B
– –
-200
Closed -$4K
FOR icon
8978
Forestar Group
FOR
$1.42B
$0 ﹤0.01%
38
-2,194
-98% -$43.4K
FORR icon
8979
Forrester Research
FORR
$172M
– –
-222
Closed -$2.21K
FORR icon
8980
PUT
Forrester Research
FORR
$172M
– –
-800
Closed -$7K
FOUR icon
8981
Shift4
FOUR
$3.68B
– –
-14,761
Closed -$1.29M
FR icon
8982
First Industrial Realty Trust
FR
$8.79B
– –
-296
Closed -$14.4K
FSLR icon
8983
First Solar
FSLR
$22.1B
– –
-55,440
Closed -$8.18M
FSP
8984
CALL
Franklin Street Properties
FSP
$46.1M
– –
-900
Closed -$1K
FTAI icon
8985
FTAI Aviation
FTAI
$22.2B
– –
-923
Closed -$103K
FTFT icon
8986
Future FinTech Group
FTFT
$2.35M
– –
-24
Closed –
FTI icon
8987
TechnipFMC
FTI
$30.3B
– –
-35,959
Closed -$1.08M
FTS icon
8988
PUT
Fortis
FTS
$29.8B
– –
-200
Closed -$9K
FTV icon
8989
Fortive
FTV
$18.5B
– –
-3,122
Closed -$164K
FUL icon
8990
PUT
H.B. Fuller
FUL
$2.96B
– –
-3,100
Closed -$173K
FULT icon
8991
Fulton Financial
FULT
$4.64B
– –
-1,236
Closed -$21.1K
FUTY icon
8992
Fidelity MSCI Utilities Index ETF
FUTY
$2.41B
– –
-56
Closed -$2K
FXB icon
8993
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.9M
– –
-4,748
Closed -$610K
FXI icon
8994
iShares China Large-Cap ETF
FXI
$4.29B
– –
-75,398
Closed -$2.7M
G icon
8995
Genpact
G
$5.15B
– –
-15,698
Closed -$711K
GAIA icon
8996
Gaia
GAIA
$47.1M
– –
-1,693
Closed -$7.72K
GAIA icon
8997
PUT
Gaia
GAIA
$47.1M
– –
-1,500
Closed -$5K
GAIN icon
8998
Gladstone Investment Corp
GAIN
$638M
– –
-6,907
Closed -$96.5K
GANX icon
8999
CALL
Gain Therapeutics
GANX
$77.6M
– –
-1,400
Closed -$2K
GASS icon
9000
CALL
StealthGas
GASS
$335M
– –
-1,400
Closed -$7K
358 359
360
361 362

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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.