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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
-10.88%
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
$1.36B
AUM Growth
+$171M
Cap. Flow
+$1.3M
Cap. Flow %
0.1%
Top 10 Hldgs %
15.2%
Holding
7,014
New
1,810
Increased
2,203
Reduced
1,391
Closed
1,420

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$29.8M
2
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$17.1M
3
DIS icon
Walt Disney
DIS
+$14.8M
4
GILD icon
Gilead Sciences
GILD
+$11.8M
5
EEM icon
iShares MSCI Emerging Markets ETF
EEM
+$11.2M

Top Sells

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$92.9M
2
AAPL icon
Apple
AAPL
+$22.5M
3
META icon
Meta Platforms (Facebook)
META
+$20.5M
4
IBM icon
IBM
IBM
+$12.7M
5
BIDU icon
Baidu
BIDU
+$10M

Sector Composition

Rank Sector Weight
1 Healthcare 6.46%
2 Communication Services 4.66%
3 Consumer Discretionary 4.6%
4 Technology 4.57%
5 Financials 4.49%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SKYW icon
6126
Skywest
SKYW
$3.82B
– –
-1,158
Closed -$18.6K
SKYY icon
6127
First Trust Cloud Computing ETF
SKYY
$2.69B
– –
-1,782
Closed -$52K
SLF icon
6128
Sun Life Financial
SLF
$45.1B
– –
-125
Closed -$4.05K
SLG icon
6129
SL Green Realty
SLG
$3.81B
– –
-4,000
Closed -$429K
SLG icon
6130
PUT
SL Green Realty
SLG
$3.81B
– –
-53
Closed -$70K
SLM icon
6131
CALL
SLM Corp
SLM
$4.56B
– –
-70
Closed -$6K
SLRC icon
6132
SLR Investment Corp
SLRC
$703M
– –
-103
Closed -$1K
SLX icon
6133
VanEck Steel ETF
SLX
$163M
– –
-2,652
Closed -$80K
SMFG icon
6134
Sumitomo Mitsui Financial
SMFG
$165B
– –
-50
Closed –
SMFG icon
6135
PUT
Sumitomo Mitsui Financial
SMFG
$165B
– –
-719
Closed -$3K
SMN icon
6136
ProShares UltraShort Materials
SMN
$4.19M
– –
-5
Closed -$2K
SNBR
6137
DELISTED
Sleep Number
SNBR
– –
-3,121
Closed -$79.7K
SNEX icon
6138
CALL
StoneX
SNEX
$8.9B
– –
-76
Closed -$7K
SNN icon
6139
Smith & Nephew
SNN
$12.5B
– –
-3,692
Closed -$132K
SNPS icon
6140
Synopsys
SNPS
$71.5B
– –
-276
Closed -$13.6K
SNX icon
6141
TD Synnex
SNX
$19.8B
– –
-7,094
Closed -$277K
SNX icon
6142
PUT
TD Synnex
SNX
$19.8B
– –
-100
Closed -$62K
SOHU
6143
Sohu.com
SOHU
$331M
– –
-2,509
Closed -$116K
SPOK icon
6144
Spok Holdings
SPOK
$220M
– –
-22
Closed –
SPR
6145
CALL
DELISTED
Spirit AeroSystems
SPR
– –
-37
Closed -$4K
SPR
6146
DELISTED
Spirit AeroSystems
SPR
– –
-775
Closed -$41.2K
SPTN
6147
CALL
DELISTED
SpartanNash
SPTN
– –
-6
Closed -$2K
SRI icon
6148
Stoneridge
SRI
$201M
– –
-362
Closed -$4.3K
SRI icon
6149
PUT
Stoneridge
SRI
$201M
– –
-10
Closed -$1K
SSP icon
6150
E.W. Scripps
SSP
$269M
– –
-2,539
Closed -$58K
244 245
246
247 248

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Simplex Trading's Q3 2015 Portfolio in Review

As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.

Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.

By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.

  • Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
  • Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
  • Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
  • Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
  • Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
  • Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
  • Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.

Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.