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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
KBR icon
4501
PUT
KBR
KBR
$4.68B
$1K ﹤0.01%
2
-14
-88% -$228
KEX icon
4502
PUT
Kirby Corp
KEX
$7.95B
$1K ﹤0.01%
7
+3
+75% +$231
KEYS icon
4503
PUT
Keysight
KEYS
$54.5B
$1K ﹤0.01%
+47
New +$1.69K
KFRC icon
4504
Kforce
KFRC
$983M
$1K ﹤0.01%
46
-112
-71% -$2.6K
KFY icon
4505
CALL
Korn Ferry
KFY
$3.98B
$1K ﹤0.01%
+2
New +$61
KGC icon
4506
PUT
Kinross Gold
KGC
$28.5B
$1K ﹤0.01%
6
-23
-79% -$67
KKR icon
4507
CALL
KKR & Co
KKR
$89.2B
$1K ﹤0.01%
8
-13
-62% -$307
LAMR icon
4508
CALL
Lamar Advertising Co
LAMR
$16.2B
$1K ﹤0.01%
+14
New +$799
LPL icon
4509
LG Display
LPL
$3.17B
$1K ﹤0.01%
+119
New +$1.84K
LQDT icon
4510
Liquidity Services
LQDT
$1.17B
$1K ﹤0.01%
189
-2,641
-93% -$23.7K
MAN icon
4511
PUT
ManpowerGroup
MAN
$2.39B
$1K ﹤0.01%
9
-6
-40% -$457
MAT icon
4512
Mattel
MAT
$4.17B
$1K ﹤0.01%
54
-2,002
-97% -$53.1K
MBI icon
4513
CALL
MBIA
MBI
$288M
$1K ﹤0.01%
31
-28
-47% -$249
MED icon
4514
CALL
Medifast
MED
$108M
$1K ﹤0.01%
+9
New +$286
MFIN icon
4515
CALL
Medallion Financial
MFIN
$226M
$1K ﹤0.01%
35
-4
-10% -$40
MG icon
4516
CALL
Mistras Group
MG
$492M
$1K ﹤0.01%
+5
New +$97
MKL icon
4517
PUT
Markel Group
MKL
$25B
$1K ﹤0.01%
+5
New +$3.62K
MOH icon
4518
CALL
Molina Healthcare
MOH
$10.3B
$1K ﹤0.01%
11
+2
+22% +$116
MPT
4519
Medical Properties Trust
MPT
$2.89B
$1K ﹤0.01%
100
-37
-27% -$550
MRCY icon
4520
CALL
Mercury Systems
MRCY
$6.2B
$1K ﹤0.01%
+9
New +$142
MRIN
4521
DELISTED
Marin Software
MRIN
$1K ﹤0.01%
+6
New +$1.72K
MSGS icon
4522
CALL
Madison Square Garden
MSGS
$9.54B
$1K ﹤0.01%
7
-18
-72% -$990
MTDR icon
4523
PUT
Matador Resources
MTDR
$6.31B
$1K ﹤0.01%
6
-6
-50% -$129
MTH icon
4524
PUT
Meritage Homes
MTH
$4.87B
$1K ﹤0.01%
86
+76
+760% +$1.54K
MWA icon
4525
CALL
Mueller Water Products
MWA
$3.92B
$1K ﹤0.01%
32
+18
+129% +$172
179 180
181
182 183

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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.