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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
DJP icon
7251
PUT
iPath Bloomberg Commodity Index Total Return ETN due 12 June 2036
DJP
$819M
– –
-78
Closed -$43K
DLB icon
7252
Dolby
DLB
$4.72B
– –
-1,689
Closed -$108K
DNOW icon
7253
DNOW Inc
DNOW
$2.63B
– –
-1,607
Closed -$22.3K
DOCU
7254
DocuSign
DOCU
$9.63B
– –
-20,111
Closed -$1.03M
DOV icon
7255
Dover
DOV
$27.2B
– –
-10,127
Closed -$875K
DRV icon
7256
Direxion Daily Real Estate Bear 3X ETF
DRV
$25M
– –
-53
Closed -$29K
DSS icon
7257
DSS Inc
DSS
$5.52M
– –
0
– –
DTE icon
7258
DTE Energy
DTE
$31.1B
– –
-3,472
Closed -$351K
DUST icon
7259
Direxion Daily Gold Miners Index Bear 2X ETF
DUST
$72.3M
– –
-24
Closed -$1.36M
DVY icon
7260
iShares Select Dividend ETF
DVY
$24B
– –
-9,658
Closed -$862K
DWSN icon
7261
CALL
Dawson Geophysical
DWSN
$155M
– –
-50
Closed -$16K
DWSN icon
7262
Dawson Geophysical
DWSN
$155M
– –
-1,913
Closed -$6K
DWSN icon
7263
PUT
Dawson Geophysical
DWSN
$155M
– –
-20
Closed -$6K
DXC icon
7264
DXC Technology
DXC
$1.63B
– –
-4,989
Closed -$319K
DY icon
7265
Dycom Industries
DY
$12.9B
– –
-1,177
Closed -$64.4K
EA icon
7266
Electronic Arts
EA
$52.4B
– –
-105,132
Closed -$9.97M
EAT icon
7267
Brinker International
EAT
$8.02B
– –
-12,631
Closed -$569K
EBAY icon
7268
eBay
EBAY
$48.6B
– –
-173,626
Closed -$6.02M
EBF icon
7269
CALL
Ennis
EBF
$546M
– –
-3
Closed -$5K
EC icon
7270
Ecopetrol
EC
$32.9B
– –
-8,211
Closed -$161K
ECH icon
7271
iShares MSCI Chile ETF
ECH
$1.01B
– –
-3,366
Closed -$139K
ECVT icon
7272
Ecovyst
ECVT
$1.36B
– –
-318
Closed -$4K
ECVT icon
7273
PUT
Ecovyst
ECVT
$1.36B
– –
-5
Closed -$7K
EEX
7274
DELISTED
Emerald Holding
EEX
– –
-470
Closed -$5K
EEX
7275
PUT
DELISTED
Emerald Holding
EEX
– –
-25
Closed -$30K
289 290
291
292 293

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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.