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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
-18.41%
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
$34.1B
AUM Growth
+$2.94B
Cap. Flow
-$379M
Cap. Flow %
-1.11%
Top 10 Hldgs %
42.6%
Holding
8,576
New
1,199
Increased
2,701
Reduced
2,877
Closed
1,573

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$58.5M
2
GOOG icon
Alphabet (Google) Class C
GOOG
+$56.5M
3
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$44.1M
4
AAPL icon
Apple
AAPL
+$20.3M
5
XOP icon
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
+$12.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$109M
2
META icon
Meta Platforms (Facebook)
META
+$62.3M
3
QQQ icon
Invesco QQQ Trust
QQQ
+$36.2M
4
GS icon
Goldman Sachs
GS
+$27.1M
5
BA icon
Boeing
BA
+$24.7M

Sector Composition

Rank Sector Weight
1 Communication Services 0.49%
2 Consumer Discretionary 0.48%
3 Technology 0.4%
4 Financials 0.25%
5 Industrials 0.22%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
AEIS icon
6901
Advanced Energy
AEIS
$12.2B
– –
-21,005
Closed -$936K
AGI icon
6902
PUT
Alamos Gold
AGI
$12.4B
– –
-34
Closed -$15K
AGRO icon
6903
Adecoagro
AGRO
$1.53B
$0 ﹤0.01%
16
-256
-94% -$1.87K
AIRG icon
6904
PUT
Airgain
AIRG
$74.3M
– –
-182
Closed -$239K
AIT icon
6905
Applied Industrial Technologies
AIT
$12.8B
– –
-67
Closed -$5K
AIT icon
6906
PUT
Applied Industrial Technologies
AIT
$12.8B
– –
-5
Closed -$39K
AIV
6907
CALL
Aimco
AIV
$380M
– –
-60
Closed -$35K
AIZ icon
6908
Assurant
AIZ
$13.7B
– –
-20,943
Closed -$2.05M
AKAM icon
6909
Akamai
AKAM
$16.8B
– –
-10,092
Closed -$671K
AKBA icon
6910
Akebia Therapeutics
AKBA
$327M
– –
-33,863
Closed -$265K
AL
6911
DELISTED
Air Lease Corp
AL
– –
-6,445
Closed -$246K
ALB icon
6912
Albemarle
ALB
$13.5B
– –
-9,292
Closed -$877K
ALDX icon
6913
PUT
Aldeyra Therapeutics
ALDX
$91.7M
– –
-146
Closed -$201K
ALEX
6914
CALL
DELISTED
Alexander & Baldwin
ALEX
– –
-14
Closed -$31K
ALEX
6915
PUT
DELISTED
Alexander & Baldwin
ALEX
– –
-8
Closed -$18K
ALLE icon
6916
CALL
Allegion
ALLE
$13B
– –
-12
Closed -$108K
ALLT icon
6917
Allot
ALLT
$374M
– –
-122
Closed -$799
ALRM icon
6918
Alarm.com
ALRM
$2.56B
– –
-2,484
Closed -$120K
ALTO icon
6919
Alto Ingredients
ALTO
$360M
$0 ﹤0.01%
+292
New +$482
ALV icon
6920
CALL
Autoliv
ALV
$8.6B
– –
-77
Closed -$667K
AMH icon
6921
PUT
American Homes 4 Rent
AMH
$12B
– –
-11
Closed -$24K
AMKR icon
6922
CALL
Amkor Technology
AMKR
$16.1B
– –
-2
Closed -$1K
AMN icon
6923
AMN Healthcare
AMN
$1.28B
– –
-1,471
Closed -$82.5K
AMP icon
6924
Ameriprise Financial
AMP
$46.8B
– –
-2,047
Closed -$257K
AMPY icon
6925
Amplify Energy
AMPY
$163M
$0 ﹤0.01%
+71
New +$567
275 276
277
278 279

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Simplex Trading's Q4 2018 Portfolio in Review

As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.

By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.

  • Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
  • Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
  • Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
  • Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
  • Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
  • Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.

Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.