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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
SANW
7701
PUT
DELISTED
S&W Seed Co
SANW
– –
-4
Closed -$17K
ECHO
7702
EchoStar
ECHO
$26.5B
– –
-3,835
Closed -$126K
SBS icon
7703
Sabesp
SBS
$20.1B
– –
-7,467
Closed -$10.7K
SBSW icon
7704
PUT
Sibanye-Stillwater
SBSW
$5.97B
– –
-47
Closed -$11K
SBUX icon
7705
Starbucks
SBUX
$118B
– –
-52,915
Closed -$3.31M
SCHL icon
7706
CALL
Scholastic
SCHL
$857M
– –
-31
Closed -$144K
SCHV
7707
Schwab US Large-Cap Value ETF
SCHV
$15.8B
– –
-399
Closed -$7K
SCI icon
7708
PUT
Service Corp International
SCI
$10.9B
– –
-231
Closed -$1.02M
SCL icon
7709
CALL
Stepan Co
SCL
$1.31B
– –
-5
Closed -$43K
SCL icon
7710
Stepan Co
SCL
$1.31B
– –
-71
Closed -$6K
SCL icon
7711
PUT
Stepan Co
SCL
$1.31B
– –
-42
Closed -$365K
SCOR icon
7712
Comscore
SCOR
$110M
– –
-16
Closed -$5.16K
SHOE
7713
PUT
Shoe Station Group
SHOE
$388M
– –
-12
Closed -$23K
SCYX icon
7714
SCYNEXIS
SCYX
$39.3M
$0 ﹤0.01%
9
-45
-83% -$3.05K
SCYX icon
7715
PUT
SCYNEXIS
SCYX
$39.3M
– –
-1
Closed -$7K
SD icon
7716
CALL
SandRidge Energy
SD
$524M
– –
-10
Closed -$10K
SDIV icon
7717
Global X SuperDividend ETF
SDIV
$1.21B
– –
-4
Closed –
SDOW icon
7718
ProShares UltraPro Short Dow 30
SDOW
$173M
– –
-71
Closed -$64K
SEIC icon
7719
PUT
SEI Investments
SEIC
$11.6B
– –
-2
Closed -$12K
SEM
7720
PUT
DELISTED
Select Medical
SEM
– –
-2
Closed -$1K
SENS icon
7721
CALL
Senseonics Holdings Inc
SENS
$254M
– –
-21
Closed -$203K
SFNC icon
7722
Simmons First National
SFNC
$3.32B
– –
-135
Closed -$3K
SFNC icon
7723
PUT
Simmons First National
SFNC
$3.32B
– –
-29
Closed -$85K
SGOL icon
7724
abrdn Physical Gold Shares ETF
SGOL
$6.91B
– –
-35,300
Closed -$418K
SGRY icon
7725
Surgery Partners
SGRY
$1.99B
– –
-6,223
Closed -$83.5K
307 308
309
310 311

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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.