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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
+22.5%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$104B
AUM Growth
+$47.9B
Cap. Flow
+$109M
Cap. Flow %
0.11%
Top 10 Hldgs %
39.88%
Holding
11,184
New
2,248
Increased
6,668
Reduced
1,000
Closed
1,196

Top Buys

Rank Stock Value
1
AMC icon
AMC Entertainment Holdings
AMC
+$39.3M
2
T icon
AT&T
T
+$29.8M
3
NVDA icon
NVIDIA
NVDA
+$28.3M
4
MU icon
Micron Technology
MU
+$22.9M
5
BIDU icon
Baidu
BIDU
+$22.3M

Top Sells

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$36.1M
2
TSLA icon
Tesla
TSLA
+$35.2M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$25.9M
4
PLTR icon
Palantir
PLTR
+$25.7M
5
WFC icon
Wells Fargo
WFC
+$20.4M

Sector Composition

Rank Sector Weight
1 Miscellaneous 97.7%
2 Technology 0.48%
3 Consumer Discretionary 0.39%
4 Communication Services 0.28%
5 Healthcare 0.27%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ERII icon
10176
Energy Recovery
ERII
$389M
– –
-27,723
Closed -$546K
ESCA icon
10177
Escalade
ESCA
$287M
– –
-1,276
Closed -$29.2K
ESE icon
10178
ESCO Technologies
ESE
$7.1B
– –
-724
Closed –
ESGE icon
10179
iShares ESG Aware MSCI EM ETF
ESGE
$7.09B
– –
-100
Closed -$4K
ESI icon
10180
Element Solutions
ESI
$8.78B
– –
-32,954
Closed -$725K
ESNT icon
10181
Essent Group
ESNT
$6.22B
– –
-781
Closed -$37.9K
ESS icon
10182
CALL
Essex Property Trust
ESS
$17.9B
– –
-50
Closed -$1.36M
ESTA icon
10183
Establishment Labs
ESTA
$2.21B
– –
-1,084
Closed -$80.6K
ESTA icon
10184
PUT
Establishment Labs
ESTA
$2.21B
– –
-35
Closed -$218K
ETNB
10185
PUT
DELISTED
89bio
ETNB
– –
-1
Closed -$2K
EUO icon
10186
ProShares UltraShort Euro
EUO
$32.9M
– –
-315
Closed -$7K
EVC icon
10187
Entravision Communication
EVC
$777M
– –
-3,772
Closed -$17K
EVR icon
10188
Evercore
EVR
$11.5B
– –
-3,546
Closed -$496K
EVTC icon
10189
PUT
Evertec
EVTC
$1.81B
– –
-8
Closed -$29K
EWA icon
10190
iShares MSCI Australia ETF
EWA
$1.34B
– –
-200,510
Closed -$5.28M
EWBC icon
10191
East-West Bancorp
EWBC
$17.9B
– –
-1,028
Closed -$76.4K
EWD icon
10192
iShares MSCI Sweden ETF
EWD
$757M
– –
-70
Closed -$3K
EWH icon
10193
iShares MSCI Hong Kong ETF
EWH
$1.2B
– –
-1,156
Closed –
EWM icon
10194
iShares MSCI Malaysia ETF
EWM
$321M
– –
-3,056
Closed -$82K
EWP icon
10195
iShares MSCI Spain ETF
EWP
$2.28B
– –
-2,977
Closed -$81K
EWT icon
10196
iShares MSCI Taiwan ETF
EWT
$12.2B
– –
-30,636
Closed -$1.84M
EWZ icon
10197
iShares MSCI Brazil ETF
EWZ
$8.62B
– –
-44,183
Closed –
EXLS icon
10198
CALL
EXL Service
EXLS
$5.55B
– –
-5
Closed -$9K
EXLS icon
10199
EXL Service
EXLS
$5.55B
– –
-120
Closed -$2.38K
EYE icon
10200
National Vision
EYE
$1.32B
$0 ﹤0.01%
15
-19,320
-100% -$948K
406 407
408
409 410

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Simplex Trading's Q2 2021 Portfolio in Review

As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.

Simplex Trading's Q2 2021 filing shows 2,248 new, 6,668 increased, 1,000 reduced and 1,196 closed positions. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M. The largest sale was Invesco QQQ Trust, an estimated $36.1M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 97% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
  • Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
  • Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
  • Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
  • Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
  • Simplex Trading opened 2,248 new positions and closed 1,196 in Q2 2021.
  • Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.

Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.