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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
+$86.7M
Cap. Flow %
0.07%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,349
Reduced
3,911
Closed
1,518

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.43%
2 Technology 0.41%
3 Healthcare 0.21%
4 Consumer Discretionary 0.21%
5 Communication Services 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
UFO icon
9976
CALL
Procure Space ETF
UFO
$558M
– –
-300
Closed -$5K
UFO icon
9977
Procure Space ETF
UFO
$558M
– –
-99
Closed -$1.87K
UFPT icon
9978
PUT
UFP Technologies
UFPT
$2.24B
– –
-500
Closed -$64K
FLZH
9979
DELISTED
FLASH SPORTS & MEDIA HLDG
FLZH
$0 ﹤0.01%
28
-21
-43% -$866
FLZH
9980
PUT
DELISTED
FLASH SPORTS & MEDIA HLDG
FLZH
– –
-204
Closed -$13K
UMBF icon
9981
UMB Financial
UMBF
$10.9B
– –
-10,862
Closed -$648K
UMBF icon
9982
PUT
UMB Financial
UMBF
$10.9B
– –
-14,600
Closed -$842K
UMH
9983
UMH Properties
UMH
$1.36B
– –
-1,297
Closed -$20.1K
UMH
9984
PUT
UMH Properties
UMH
$1.36B
– –
-2,800
Closed -$41K
UNH icon
9985
UnitedHealth
UNH
$356B
– –
-52,281
Closed -$25.6M
UP icon
9986
Wheels Up
UP
$158M
– –
-74
Closed -$5.23K
URNM icon
9987
CALL
Sprott Uranium Miners ETF
URNM
$2.17B
– –
-29,000
Closed -$909K
URNM icon
9988
PUT
Sprott Uranium Miners ETF
URNM
$2.17B
– –
-17,100
Closed -$536K
URTY icon
9989
ProShares UltraPro Russell2000
URTY
$321M
– –
-3,773
Closed -$142K
USCI icon
9990
US Commodity Index
USCI
$403M
– –
-8,641
Closed -$468K
USDU icon
9991
WisdomTree Bloomberg US Dollar Bullish Fund
USDU
$274M
– –
-1,000
Closed -$26K
USL icon
9992
CALL
United States 12 Month Oil Fund,
USL
$45.5M
– –
-6,100
Closed -$205K
USNA icon
9993
PUT
Usana Health Sciences
USNA
$276M
– –
-700
Closed -$44K
USPH icon
9994
PUT
US Physical Therapy
USPH
$1.18B
– –
-1,900
Closed -$186K
USRT icon
9995
iShares Core US REIT ETF
USRT
$4.56B
– –
-114
Closed -$5K
UTEN icon
9996
US Treasury 10 Year Note ETF
UTEN
$267M
– –
-480
Closed -$22K
UTHR icon
9997
United Therapeutics
UTHR
$20.9B
– –
-6,374
Closed -$1.41M
UTI icon
9998
Universal Technical Institute
UTI
$1.22B
– –
-100
Closed –
UTSL icon
9999
Direxion Daily Utilities Bull 3X ETF
UTSL
$49.3M
– –
-53
Closed -$1K
UUP icon
10000
Invesco DB US Dollar Index Bullish Fund
UUP
$300M
– –
-101,679
Closed -$2.85M
398 399
400
401 402

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,349 increased, 3,911 reduced and 1,518 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

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

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,518 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.