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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
BTG icon
7026
CALL
B2Gold
BTG
$5.16B
– –
-22
Closed -$5K
BW icon
7027
CALL
Babcock & Wilcox
BW
$1.43B
– –
-2
Closed -$1K
BWEN icon
7028
CALL
Broadwind
BWEN
$113M
– –
-23
Closed -$5K
BWEN icon
7029
Broadwind
BWEN
$113M
– –
-188
Closed -$335
BWXT icon
7030
CALL
BWX Technologies
BWXT
$16B
– –
-123
Closed -$769K
BWXT icon
7031
BWX Technologies
BWXT
$16B
– –
-512
Closed -$25.4K
CACI icon
7032
CACI
CACI
$10.8B
– –
-5,991
Closed -$1.02M
CACI icon
7033
PUT
CACI
CACI
$10.8B
– –
-53
Closed -$975K
CADE
7034
DELISTED
Cadence Bank
CADE
– –
-91
Closed -$2.65K
CAG icon
7035
CALL
Conagra Brands
CAG
$7.07B
– –
-1,321
Closed -$4.49M
CAG icon
7036
PUT
Conagra Brands
CAG
$7.07B
– –
-226
Closed -$767K
CAKE icon
7037
Cheesecake Factory
CAKE
$4.21B
– –
-22,534
Closed -$1.09M
CALM icon
7038
Cal-Maine
CALM
$4.28B
– –
-1,752
Closed -$81.2K
CARG icon
7039
CarGurus
CARG
$3.01B
– –
-8,034
Closed -$322K
CASH icon
7040
Pathward Financial
CASH
$1.81B
– –
-30
Closed -$700
CASH icon
7041
PUT
Pathward Financial
CASH
$1.81B
– –
-6
Closed -$16K
CATO icon
7042
PUT
Cato Corp
CATO
$65.9M
– –
-97
Closed -$203K
CBRE icon
7043
CBRE Group
CBRE
$40.8B
– –
-9,163
Closed -$379K
CBRL icon
7044
Cracker Barrel
CBRL
$1.2B
– –
-3,389
Closed -$557K
CBZ icon
7045
CALL
CBIZ
CBZ
$2.29B
– –
-16
Closed -$37K
CBZ icon
7046
CBIZ
CBZ
$2.29B
– –
-2,813
Closed -$66K
CBZ icon
7047
PUT
CBIZ
CBZ
$2.29B
– –
-1
Closed -$2K
CCJ icon
7048
Cameco
CCJ
$38.3B
– –
-6,082
Closed -$70.4K
CCK icon
7049
Crown Holdings
CCK
$12.8B
– –
-486
Closed -$22.5K
CCOI icon
7050
Cogent Communications
CCOI
$594M
– –
-346
Closed -$17.1K
280 281
282
283 284

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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.