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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
GORV
9051
DELISTED
Lazydays
GORV
$0 ﹤0.01%
6
-16
-73% -$111
GP
9052
CALL
GreenPower Motor Co
GP
$10.8M
– –
-5,360
Closed -$26K
GP
9053
GreenPower Motor Co
GP
$10.8M
– –
-762
Closed -$3K
GPI icon
9054
Group 1 Automotive
GPI
$3.89B
– –
-206
Closed -$86.5K
GPIX icon
9055
Goldman Sachs ETF Trust Goldman Sachs S&P 500 Premium Income ETF
GPIX
$4.75B
– –
-6
Closed –
GPN icon
9056
Global Payments
GPN
$21.3B
– –
-48,430
Closed -$3.83M
GPRK icon
9057
CALL
GeoPark
GPRK
$666M
– –
-1,900
Closed -$15K
GRC icon
9058
Gorman-Rupp
GRC
$2.1B
– –
-101
Closed -$3K
GRC icon
9059
PUT
Gorman-Rupp
GRC
$2.1B
– –
-200
Closed -$7K
GREK
9060
Global X MSCI Greece ETF
GREK
$281M
– –
-108
Closed -$5K
GRND icon
9061
Grindr
GRND
$2.61B
– –
-10,484
Closed -$230K
GROV icon
9062
PUT
Grove Collaborative
GROV
$45M
– –
-2,100
Closed -$2K
GROW icon
9063
US Global Investors
GROW
$36M
$0 ﹤0.01%
+68
New +$152
GROY icon
9064
Gold Royalty Corp
GROY
$595M
– –
-45,129
Closed -$79.2K
GSBD icon
9065
Goldman Sachs BDC
GSBD
$969M
– –
-1,763
Closed -$19.4K
GSG icon
9066
iShares S&P GSCI Commodity-Indexed Trust
GSG
$1.03B
– –
-4,027
Closed -$87.3K
GSIT icon
9067
CALL
GSI Technology
GSIT
$233M
– –
-8,200
Closed -$16K
GTLS
9068
DELISTED
Chart Industries
GTLS
– –
-2,841
Closed -$417K
GTY
9069
Getty Realty Corp
GTY
$2.1B
– –
-4,556
Closed -$131K
GURU icon
9070
Global X Guru Index ETF
GURU
$61.2M
– –
-75
Closed -$3K
GWW icon
9071
W.W. Grainger
GWW
$64.6B
– –
-126
Closed -$131K
GXC icon
9072
State Street SPDR S&P China ETF
GXC
$447M
– –
-34
Closed -$2K
H icon
9073
Hyatt Hotels
H
$17.3B
– –
-4,915
Closed -$613K
HARD icon
9074
Simplify Commodities Strategy No K-1 ETF
HARD
$85.5M
– –
-134
Closed -$4K
HBIO icon
9075
Harvard Bioscience
HBIO
$27.9M
– –
-410
Closed -$1.71K
361 362
363
364 365

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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.