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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
+$10.1B
Cap. Flow %
8.87%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,665
Reduced
3,633
Closed
1,729

Top Buys

Rank Stock Value
1
WMT icon
Walmart Inc
WMT
+$43.6M
2
AAPL icon
Apple
AAPL
+$40.9M
3
OIH icon
VanEck Oil Services ETF
OIH
+$37.7M
4
C icon
Citigroup
C
+$34.2M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$32.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$189M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$123M
3
NVDA icon
NVIDIA
NVDA
+$115M
4
TSLA icon
Tesla
TSLA
+$52M
5
META icon
Meta Platforms (Facebook)
META
+$49M

Sector Composition

Rank Sector Weight
1 Technology 0.42%
2 Consumer Discretionary 0.2%
3 Healthcare 0.17%
4 Industrials 0.15%
5 Communication Services 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
QLD icon
9901
ProShares Ultra QQQ
QLD
$12.8B
– –
-24,160
Closed -$423K
QLYS icon
9902
PUT
Qualys
QLYS
$4.71B
– –
-7,300
Closed -$819K
QMCO icon
9903
Quantum Corp
QMCO
$455M
– –
-1
Closed –
QNCX icon
9904
Quince Therapeutics
QNCX
$17.9M
– –
-332
Closed -$65K
QNCX icon
9905
PUT
Quince Therapeutics
QNCX
$17.9M
– –
-415
Closed -$52K
QNST icon
9906
PUT
QuinStreet
QNST
$861M
– –
-1,300
Closed -$18K
QQQ icon
9907
Invesco QQQ Trust
QQQ
$460B
– –
-417,448
Closed -$123M
QQQJ icon
9908
Invesco NASDAQ Next Gen 100 ETF
QQQJ
$1.12B
– –
-5,468
Closed -$130K
QSI icon
9909
PUT
Quantum-Si Incorporated
QSI
$172M
– –
-12,300
Closed -$22K
QTEC icon
9910
First Trust NASDAQ-100 Technology Index Fund
QTEC
$4.51B
– –
-696
Closed -$83.4K
QTRX icon
9911
CALL
Quanterix
QTRX
$185M
– –
-1,900
Closed -$26K
QTRX icon
9912
Quanterix
QTRX
$185M
– –
-137,836
Closed -$1.76M
QTRX icon
9913
PUT
Quanterix
QTRX
$185M
– –
-25,900
Closed -$358K
QTWO icon
9914
Q2 Holdings
QTWO
$3.31B
– –
-1,566
Closed -$46.6K
QUAD icon
9915
Quad
QUAD
$428M
– –
-1,455
Closed -$6.42K
QURE icon
9916
uniQure
QURE
$2.71B
– –
-43,355
Closed -$910K
QYLD icon
9917
Global X NASDAQ-100 Covered Call ETF
QYLD
$8B
$0 ﹤0.01%
50
-15,711
-100% -$262K
RBB icon
9918
RBB Bancorp
RBB
$448M
$0 ﹤0.01%
+4
New +$77
RC
9919
Ready Capital
RC
$267M
– –
-25,441
Closed -$298K
RCI icon
9920
Rogers Communications
RCI
$17.6B
– –
-2,652
Closed -$126K
RCMT icon
9921
RCM Technologies
RCMT
$195M
– –
-834
Closed -$11K
RDHL
9922
Redhill Biopharma
RDHL
$4.06M
– –
-8
Closed -$1.51K
RDVT icon
9923
PUT
Red Violet
RDVT
$840M
– –
-5,700
Closed -$131K
REAL icon
9924
The RealReal
REAL
$1.37B
$0 ﹤0.01%
58
-135,251
-100% -$196K
REAL icon
9925
PUT
The RealReal
REAL
$1.37B
– –
-24,300
Closed -$30K
395 396
397
398 399

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Simplex Trading's Q1 2023 Portfolio in Review

As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.

Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.

By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.

  • Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
  • Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
  • Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
  • Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
  • Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
  • Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
  • Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.

Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.