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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
STNE icon
10676
StoneCo
STNE
$2.33B
– –
-6,560
Closed -$425K
STOK icon
10677
CALL
Stoke Therapeutics
STOK
$1.92B
– –
-3
Closed -$11K
STOK icon
10678
PUT
Stoke Therapeutics
STOK
$1.92B
– –
-7
Closed -$27K
STRA icon
10679
Strategic Education
STRA
$1.81B
– –
-747
Closed -$59.6K
STRO icon
10680
Sutro Biopharma
STRO
$333M
$0 ﹤0.01%
2
-711
-100% -$139K
STRO icon
10681
PUT
Sutro Biopharma
STRO
$333M
– –
-2
Closed -$34K
STXS icon
10682
Stereotaxis
STXS
$139M
– –
-750
Closed -$5.92K
SVC
10683
Service Properties Trust
SVC
$986M
– –
-270
Closed -$16.7K
SXT icon
10684
Sensient Technologies
SXT
$5.74B
$0 ﹤0.01%
+10
New +$847
SYBX
10685
DELISTED
Synlogic
SYBX
– –
-1,242
Closed -$67.8K
TACT icon
10686
CALL
Transact Technologies
TACT
$53.1M
– –
-51
Closed -$55K
TACT icon
10687
PUT
Transact Technologies
TACT
$53.1M
– –
-12
Closed -$13K
TBF icon
10688
ProShares Short 20+ Year Treasury ETF
TBF
$117M
– –
-60,151
Closed -$1.09M
TCX icon
10689
PUT
Tucows
TCX
$120M
– –
-1
Closed -$7K
TDIV icon
10690
First Trust NASDAQ Technology Dividend Index Fund
TDIV
$4.43B
– –
-805
Closed -$43K
TDOC icon
10691
Teladoc Health
TDOC
$1.14B
– –
-78,708
Closed -$12.8M
TDY icon
10692
Teledyne Technologies
TDY
$28.3B
– –
-562
Closed -$239K
TECH icon
10693
Bio-Techne
TECH
$11.4B
– –
-7,596
Closed -$800K
TEF
10694
CALL
DELISTED
Telefonica
TEF
– –
-169
Closed -$67K
TENB icon
10695
Tenable Holdings
TENB
$3.77B
– –
-4,193
Closed -$170K
TEX icon
10696
Terex
TEX
$7.23B
– –
-3,330
Closed -$162K
TFSL icon
10697
TFS Financial
TFSL
$4.93B
– –
-9,646
Closed -$201K
TGB
10698
CALL
Trekor Metals
TGB
$3.09B
– –
-165
Closed -$28K
TGS icon
10699
Transportadora de Gas del Sur
TGS
$4.37B
– –
-100
Closed –
THR
10700
DELISTED
Thermon Group Holdings
THR
– –
-745
Closed -$13.9K
426 427
428
429 430

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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.