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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
+2.14%
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
$860M
AUM Growth
+$34.4M
Cap. Flow
-$17.8M
Cap. Flow %
-2.07%
Top 10 Hldgs %
14.96%
Holding
6,670
New
1,973
Increased
1,386
Reduced
1,513
Closed
1,643

Top Buys

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$40.1M
2
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$12.5M
3
BABA icon
Alibaba
BABA
+$10.5M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$9.89M
5
INTC icon
Intel
INTC
+$9.83M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$35.7M
2
GILD icon
Gilead Sciences
GILD
+$32.3M
3
AMZN icon
Amazon
AMZN
+$29M
4
BKNG icon
Booking.com
BKNG
+$28.4M
5
BIDU icon
Baidu
BIDU
+$13.3M

Sector Composition

Rank Sector Weight
1 Communication Services 7.76%
2 Consumer Discretionary 7.62%
3 Healthcare 7.24%
4 Technology 6.95%
5 Financials 4.83%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PRTA icon
4176
CALL
Prothena Corp
PRTA
$457M
$2K ﹤0.01%
+19
New +$487
PSQ icon
4177
ProShares Short QQQ
PSQ
$832M
$2K ﹤0.01%
+8
New +$2.33K
PWR icon
4178
PUT
Quanta Services
PWR
$92.3B
$2K ﹤0.01%
19
-63
-77% -$1.77K
RIO icon
4179
CALL
Rio Tinto
RIO
$149B
$2K ﹤0.01%
97
-106
-52% -$4.79K
RPM icon
4180
PUT
RPM International
RPM
$13.7B
$2K ﹤0.01%
+11
New +$532
RRGB icon
4181
CALL
Red Robin
RRGB
$135M
$2K ﹤0.01%
4
+1
+33% +$81
SEM
4182
PUT
DELISTED
Select Medical
SEM
$2K ﹤0.01%
+110
New +$822
SGU icon
4183
CALL
Star Group
SGU
$421M
$2K ﹤0.01%
+10
New +$68
SKYW icon
4184
Skywest
SKYW
$4.31B
$2K ﹤0.01%
+166
New +$2.31K
SNCR
4185
CALL
DELISTED
Synchronoss Technologies
SNCR
$2K ﹤0.01%
+1
New +$394
SOYB icon
4186
Teucrium Soybean Fund
SOYB
$62M
$2K ﹤0.01%
+124
New +$2.48K
SPR
4187
PUT
DELISTED
Spirit AeroSystems
SPR
$2K ﹤0.01%
+17
New +$813
SPXC icon
4188
SPX Corp
SPXC
$10.9B
$2K ﹤0.01%
+131
New +$2.81K
SRE icon
4189
PUT
Sempra
SRE
$59.9B
$2K ﹤0.01%
108
+20
+23% +$1.1K
SSP icon
4190
CALL
E.W. Scripps
SSP
$278M
$2K ﹤0.01%
11
+5
+83% +$101
STM icon
4191
CALL
STMicroelectronics
STM
$47.2B
$2K ﹤0.01%
+56
New +$488
STM icon
4192
PUT
STMicroelectronics
STM
$47.2B
$2K ﹤0.01%
46
+4
+10% +$35
SVC
4193
PUT
Service Properties Trust
SVC
$1.09B
$2K ﹤0.01%
+9
New +$1.44K
TDG icon
4194
CALL
TransDigm Group
TDG
$71.9B
$2K ﹤0.01%
1
-8
-89% -$1.69K
TEX icon
4195
Terex
TEX
$7.86B
$2K ﹤0.01%
100
-596
-86% -$15.1K
TITN icon
4196
Titan Machinery
TITN
$471M
$2K ﹤0.01%
208
+107
+106% +$1.44K
TK icon
4197
CALL
Teekay
TK
$970M
$2K ﹤0.01%
30
– –
TKR icon
4198
PUT
Timken Company
TKR
$9.69B
$2K ﹤0.01%
3
-4
-57% -$166
TMV icon
4199
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$177M
$2K ﹤0.01%
+40
New +$2.77K
TOL icon
4200
PUT
Toll Brothers
TOL
$14.1B
$2K ﹤0.01%
55
-50
-48% -$1.83K
166 167
168
169 170

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Simplex Trading's Q1 2015 Portfolio in Review

As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.

Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.

By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.

  • Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
  • Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
  • Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
  • Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
  • Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
  • Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
  • Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.

Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.