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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
-$49.6M
Cap. Flow %
-0.04%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,663
Reduced
3,631
Closed
1,728

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 Miscellaneous 98.51%
2 Technology 0.42%
3 Consumer Discretionary 0.2%
4 Healthcare 0.17%
5 Industrials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
REE
9926
DELISTED
REE Automotive
REE
– –
-1,039
Closed -$13.3K
REAX icon
9927
Real REMAX Group Inc. Common Stock
REAX
$407M
$0 ﹤0.01%
13
-30
-70% -$394
REFR icon
9928
CALL
Research Frontiers
REFR
$14.5M
– –
-2,800
Closed -$5K
REI icon
9929
Ring Energy
REI
$391M
– –
-4,039
Closed -$8.71K
REKR icon
9930
Rekor Systems
REKR
$73.8M
– –
-30,795
Closed -$49K
RELX icon
9931
CALL
RELX
RELX
$61.8B
– –
-1,800
Closed -$49K
RES icon
9932
RPC Inc
RES
$1.44B
– –
-13,913
Closed -$124K
RETL icon
9933
Direxion Daily Retail Bull 3X ETF
RETL
$26.6M
– –
-2,865
Closed -$19K
REXR icon
9934
Rexford Industrial Realty
REXR
$8.2B
$0 ﹤0.01%
16
-169
-91% -$10.1K
REYN icon
9935
Reynolds Consumer Products
REYN
$4.61B
– –
-124
Closed -$3.5K
REYN icon
9936
PUT
Reynolds Consumer Products
REYN
$4.61B
– –
-1,300
Closed -$38K
RGLS
9937
DELISTED
Regulus Therapeutics
RGLS
– –
-301
Closed -$398
RGP icon
9938
Resources Connection
RGP
$139M
– –
-142
Closed -$2.49K
RGP icon
9939
PUT
Resources Connection
RGP
$139M
– –
-100
Closed -$1K
RGS icon
9940
PUT
Regis Corp
RGS
$71.2M
– –
-8,310
Closed -$202K
RGTI icon
9941
Rigetti Computing
RGTI
$5.07B
– –
-16,425
Closed -$13.3K
RGTI icon
9942
PUT
Rigetti Computing
RGTI
$5.07B
– –
-3,700
Closed -$2K
RKDA icon
9943
Arcadia Biosciences
RKDA
$1.14M
– –
-6
Closed –
RLI icon
9944
RLI Corp
RLI
$5.73B
– –
-1,534
Closed -$100K
RLJ icon
9945
RLJ Lodging Trust
RLJ
$1.67B
– –
-8,306
Closed -$93.3K
RLMD icon
9946
PUT
Relmada Therapeutics
RLMD
$473M
– –
-8,000
Closed -$27K
RLX icon
9947
RLX Technology
RLX
$2.2B
– –
-185,618
Closed -$450K
RMD icon
9948
ResMed
RMD
$32.9B
– –
-2,953
Closed -$641K
RMNI icon
9949
PUT
Rimini Street
RMNI
$468M
– –
-16,900
Closed -$64K
ROAD icon
9950
Construction Partners
ROAD
$5.94B
– –
-55
Closed -$1.5K
396 397
398
399 400

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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's Q1 2023 filing shows 1,536 new, 3,663 increased, 3,631 reduced and 1,728 closed positions. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M. The largest sale was Amazon, an estimated $189M.

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

  • 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 1,728 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.