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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
+17.83%
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
$36B
AUM Growth
+$1.89B
Cap. Flow
-$586M
Cap. Flow %
-1.63%
Top 10 Hldgs %
34.84%
Holding
8,479
New
1,472
Increased
3,049
Reduced
2,419
Closed
1,324

Top Buys

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$86.9M
2
DIS icon
Walt Disney
DIS
+$25.5M
3
BIDU icon
Baidu
BIDU
+$12.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$12.3M
5
RHT
Red Hat Inc
RHT
+$11.4M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$60.3M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$33.9M
4
AAPL icon
Apple
AAPL
+$21.1M
5
XLF icon
State Street Financial Select Sector SPDR ETF
XLF
+$18.2M

Sector Composition

Rank Sector Weight
1 Communication Services 0.58%
2 Technology 0.42%
3 Healthcare 0.34%
4 Consumer Discretionary 0.29%
5 Industrials 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VLY icon
7926
Valley National Bancorp
VLY
$7.83B
– –
-24,707
Closed -$252K
VMC icon
7927
Vulcan Materials
VMC
$35.7B
– –
-6,074
Closed -$656K
VNDA icon
7928
Vanda Pharmaceuticals
VNDA
$322M
– –
-10,207
Closed -$233K
VNET
7929
CALL
VNET Group
VNET
$2.22B
– –
-55
Closed -$47K
VNO icon
7930
Vornado Realty Trust
VNO
$7.38B
– –
-27,423
Closed -$1.84M
VOX icon
7931
Vanguard Communication Services ETF
VOX
$5.52B
– –
-675
Closed -$49K
VRA icon
7932
Vera Bradley
VRA
$106M
– –
-3,350
Closed -$34.2K
VRE
7933
PUT
DELISTED
Veris Residential
VRE
– –
-5
Closed -$9K
VREX icon
7934
PUT
Varex Imaging
VREX
$448M
– –
-2
Closed -$4K
VRNS icon
7935
Varonis Systems
VRNS
$5.12B
– –
-3,138
Closed -$59.5K
VRNT
7936
DELISTED
Verint Systems
VRNT
– –
-618
Closed -$15.7K
VRSK icon
7937
Verisk Analytics
VRSK
$25.3B
– –
-4,018
Closed -$489K
VSAT icon
7938
Viasat
VSAT
$10.2B
– –
-1,139
Closed -$79.3K
VSTM icon
7939
Verastem
VSTM
$540M
– –
-1,530
Closed -$60.5K
VTLE
7940
DELISTED
Vital Energy
VTLE
– –
-3,180
Closed -$226K
VTRS icon
7941
Viatris
VTRS
$19.8B
– –
-50,642
Closed -$1.48M
VV icon
7942
Vanguard Large-Cap ETF
VV
$51.9B
– –
-100
Closed -$11K
VVV icon
7943
Valvoline
VVV
$4.94B
– –
-2,140
Closed -$42.4K
VVX icon
7944
V2X
VVX
$2.64B
– –
-93
Closed -$2K
VVX icon
7945
PUT
V2X
VVX
$2.64B
– –
-1
Closed -$2K
VZ icon
7946
Verizon
VZ
$185B
– –
-64,709
Closed -$3.66M
WABC icon
7947
Westamerica Bancorp
WABC
$1.38B
– –
-2,113
Closed -$117K
WABC icon
7948
PUT
Westamerica Bancorp
WABC
$1.38B
– –
-41
Closed -$228K
WAL icon
7949
Western Alliance Bancorporation
WAL
$8.91B
– –
-3,503
Closed -$154K
WBS icon
7950
CALL
Webster Financial
WBS
$12.2B
– –
-30
Closed -$147K
316 317
318
319 320

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Simplex Trading's Q1 2019 Portfolio in Review

As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.

Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.

By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
  • Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
  • Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
  • Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
  • Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
  • Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
  • Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.

Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.