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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
+7.55%
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
$31.1B
AUM Growth
+$5.63B
Cap. Flow
+$12.2M
Cap. Flow %
0.04%
Top 10 Hldgs %
33.61%
Holding
8,699
New
1,336
Increased
3,066
Reduced
2,755
Closed
1,315

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$148M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$67.3M
3
META icon
Meta Platforms (Facebook)
META
+$63.2M
4
GS icon
Goldman Sachs
GS
+$23.9M
5
C icon
Citigroup
C
+$23.1M

Top Sells

Rank Stock Value
1
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$47.5M
2
AAPL icon
Apple
AAPL
+$46M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$44.5M
4
MU icon
Micron Technology
MU
+$29.1M
5
ADBE icon
Adobe
ADBE
+$22.2M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 1.13%
2 Communication Services 0.89%
3 Technology 0.68%
4 Industrials 0.51%
5 Healthcare 0.44%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SCSC icon
7976
PUT
Scansource
SCSC
$1.1B
– –
-12
Closed -$48K
SHOE
7977
Shoe Station Group
SHOE
$390M
– –
-306
Closed -$5.44K
SDIV icon
7978
Global X SuperDividend ETF
SDIV
$1.21B
$0 ﹤0.01%
4
-130
-97% -$8.09K
SE icon
7979
Sea Limited
SE
$61B
– –
-5,242
Closed -$75.5K
SDY icon
7980
State Street SPDR S&P Dividend ETF
SDY
$21.6B
– –
-133
Closed -$12K
SEE
7981
DELISTED
Sealed Air
SEE
– –
-3,044
Closed -$126K
SEM
7982
DELISTED
Select Medical
SEM
– –
-2,170
Closed -$22.5K
SFM icon
7983
Sprouts Farmers Market
SFM
$6.82B
– –
-6,374
Closed -$156K
SHEN icon
7984
Shenandoah Telecom
SHEN
$639M
– –
-91
Closed -$3.24K
SHY icon
7985
iShares 1-3 Year Treasury Bond ETF
SHY
$25.3B
– –
-528
Closed -$44K
SHYF
7986
DELISTED
The Shyft Group
SHYF
– –
-8,630
Closed -$129K
SHYF
7987
PUT
DELISTED
The Shyft Group
SHYF
– –
-207
Closed -$312K
SIFY
7988
Sify Technologies
SIFY
$1.03B
$0 ﹤0.01%
1
-38
-97% -$405
SIGA icon
7989
PUT
SIGA Technologies
SIGA
$224M
– –
-30
Closed -$17K
SIL icon
7990
Global X Silver Miners ETF NEW
SIL
$4.07B
– –
-5,469
Closed -$157K
SILJ icon
7991
Amplify Junior Silver Miners ETF
SILJ
$3.28B
$0 ﹤0.01%
78
-360
-82% -$3.44K
SIMO icon
7992
Silicon Motion
SIMO
$9.85B
– –
-2,378
Closed -$132K
SJT
7993
San Juan Basin Royalty Trust
SJT
$120M
– –
-24
Closed -$138
SJT
7994
PUT
San Juan Basin Royalty Trust
SJT
$120M
– –
-7
Closed -$4K
HTO
7995
CALL
H2O America
HTO
$2.67B
– –
-280
Closed -$1.85M
HTO
7996
PUT
H2O America
HTO
$2.67B
– –
-1
Closed -$6K
SKT icon
7997
Tanger
SKT
$4.72B
– –
-400
Closed -$9.45K
SKYW icon
7998
Skywest
SKYW
$3.78B
– –
-442
Closed -$26.2K
SLGN icon
7999
CALL
Silgan Holdings
SLGN
$4.8B
– –
-5
Closed -$13K
DCOY
8000
Decoy Therapeutics
DCOY
$2.63M
– –
0
– –
318 319
320
321 322

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Simplex Trading's Q3 2018 Portfolio in Review

As of Q3 2018, Simplex Trading held 8,699 positions worth $31.1B, up 22% from $25.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.

Simplex Trading's Q3 2018 filing shows 1,336 new, 3,066 increased, 2,755 reduced and 1,315 closed positions. Its largest new stake was Invesco QQQ Trust: 371,806 shares worth $69.1M. The largest sale was Berkshire Hathaway Class B, an estimated $47.5M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 1.1% of assets, up from 0.92% a quarter earlier, followed by Communication Services and Technology.

  • Simplex Trading's largest Q3 2018 buy was Invesco QQQ Trust: 371,806 shares worth $69.1M.
  • Simplex Trading added most to Amazon in Q3 2018, an estimated $148M increase.
  • Simplex Trading's biggest Q3 2018 reduction was Apple, cutting an estimated $46M.
  • Simplex Trading fully exited Berkshire Hathaway Class B in Q3 2018, selling an estimated $47.5M.
  • Simplex Trading's ten largest holdings make up 34% of its $31.1B portfolio in Q3 2018.
  • Simplex Trading opened 1,336 new positions and closed 1,315 in Q3 2018.
  • Simplex Trading's portfolio value rose 22% quarter-over-quarter to $31.1B.

Based on Simplex Trading's 13F filing for Q3 2018, filed 23 Oct 2018.