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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
PRN icon
9876
Invesco Dorsey Wright Industrials Momentum ETF
PRN
$446M
– –
-32
Closed -$2K
PROF
9877
CALL
Profound Medical
PROF
$249M
– –
-8,500
Closed -$92K
PRPH
9878
DELISTED
ProPhase Labs
PRPH
– –
-85
Closed -$6.85K
PRPO icon
9879
Precipio
PRPO
$40.9M
$0 ﹤0.01%
24
-39
-62% -$593
PRTS icon
9880
CarParts.com
PRTS
$38.9M
– –
-338
Closed -$21.4K
PSA icon
9881
Public Storage
PSA
$55.3B
– –
-1,971
Closed -$580K
PSCE icon
9882
Invesco S&P SmallCap Energy ETF
PSCE
$103M
– –
-613
Closed -$31K
PSFE icon
9883
Paysafe
PSFE
$397M
– –
-43
Closed -$837
PSI icon
9884
Invesco Semiconductors ETF
PSI
$2.59B
– –
-687
Closed -$22K
PSNL icon
9885
PUT
Personalis
PSNL
$1.3B
– –
-2,700
Closed -$5K
PSN icon
9886
PUT
Parsons
PSN
$6.25B
– –
-700
Closed -$32K
PSR icon
9887
Invesco Active US Real Estate Fund
PSR
$59.3M
– –
-121
Closed -$10.9K
P
9888
Everpure Inc
P
$25B
– –
-279,503
Closed -$7.54M
PTEN icon
9889
Patterson-UTI
PTEN
$3.93B
– –
-4,539
Closed -$66.3K
PUK icon
9890
PUT
Prudential
PUK
$36.2B
– –
-400
Closed -$10K
PVBC
9891
DELISTED
Provident Bancorp
PVBC
– –
-19,855
Closed -$165K
PVL
9892
Permianville Royalty Trust
PVL
$56.8M
– –
-3,490
Closed -$9.48K
PXLW icon
9893
Pixelworks
PXLW
$38.2M
– –
-1,338
Closed -$28.2K
PXLW icon
9894
PUT
Pixelworks
PXLW
$38.2M
– –
-333
Closed -$7K
PYPD icon
9895
CALL
PolyPid
PYPD
$81.3M
– –
-70
Closed -$1K
PYPD icon
9896
PolyPid
PYPD
$81.3M
– –
-4,358
Closed -$92.7K
QBTS icon
9897
CALL
D-Wave Quantum
QBTS
$6.33B
– –
-34,800
Closed -$41K
QDEL icon
9898
QuidelOrtho
QDEL
$1.13B
– –
-2,626
Closed -$228K
QDIV icon
9899
Global X S&P 500 Quality Dividend ETF
QDIV
$29M
– –
-100
Closed -$3K
QIPT
9900
CALL
DELISTED
Quipt Home Medical
QIPT
– –
-300
Closed -$1K
394 395
396
397 398

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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.