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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
-6.21%
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
$56.7B
AUM Growth
+$11B
Cap. Flow
+$631M
Cap. Flow %
1.11%
Top 10 Hldgs %
50.41%
Holding
8,783
New
1,512
Increased
3,249
Reduced
2,705
Closed
1,159

Top Buys

Rank Stock Value
1
GLD icon
SPDR Gold Trust
GLD
+$31.6M
2
SLV icon
iShares Silver Trust
SLV
+$28.1M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$25.1M
4
JPM icon
JPMorgan Chase
JPM
+$24.5M
5
JNUG icon
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
+$24M

Top Sells

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$51.6M
2
AMZN icon
Amazon
AMZN
+$47.4M
3
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$44.7M
4
NFLX icon
Netflix
NFLX
+$38.3M
5
NVDA icon
NVIDIA
NVDA
+$31.1M

Sector Composition

Rank Sector Weight
1 Technology 0.49%
2 Healthcare 0.33%
3 Consumer Discretionary 0.32%
4 Financials 0.16%
5 Communication Services 0.16%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
AFYA icon
7501
PUT
Afya
AFYA
$1.26B
– –
-13
Closed -$35K
AGX icon
7502
Argan
AGX
$8.12B
– –
-231
Closed -$9K
AHRT
7503
AH Realty Trust
AHRT
$535M
– –
-4,130
Closed -$66.9K
AIRG icon
7504
Airgain
AIRG
$76.2M
$0 ﹤0.01%
45
-117
-72% -$1.02K
AKAM icon
7505
Akamai
AKAM
$17B
– –
-1,484
Closed -$138K
ALDX icon
7506
CALL
Aldeyra Therapeutics
ALDX
$90.5M
– –
-13
Closed -$7K
ALEX
7507
DELISTED
Alexander & Baldwin
ALEX
$0 ﹤0.01%
88
+7
+9% +$131
ALLT icon
7508
CALL
Allot
ALLT
$375M
– –
-10
Closed -$8K
ALRM icon
7509
Alarm.com
ALRM
$2.57B
– –
-399
Closed -$17.4K
ALT icon
7510
Altimmune
ALT
$545M
$0 ﹤0.01%
+94
New +$216
ALTO icon
7511
CALL
Alto Ingredients
ALTO
$364M
– –
-58
Closed -$3K
ALTO icon
7512
PUT
Alto Ingredients
ALTO
$364M
– –
-20
Closed -$1K
ALV icon
7513
Autoliv
ALV
$8.58B
– –
-5,527
Closed -$379K
OSG
7514
Octave Specialty Group
OSG
$253M
– –
-16,214
Closed -$349K
AMD icon
7515
Advanced Micro Devices
AMD
$869B
– –
-296,533
Closed -$14.3M
AMED
7516
DELISTED
Amedisys
AMED
– –
-8,192
Closed -$1.46M
AMH icon
7517
American Homes 4 Rent
AMH
$12B
– –
-44
Closed -$1.16K
AMH icon
7518
PUT
American Homes 4 Rent
AMH
$12B
– –
-2
Closed -$5K
AMLP icon
7519
Alerian MLP ETF
AMLP
$13B
– –
-15,060
Closed -$640K
AMP icon
7520
Ameriprise Financial
AMP
$46.5B
– –
-5,565
Closed -$825K
AMPH icon
7521
CALL
Amphastar Pharmaceuticals
AMPH
$834M
– –
-17
Closed -$32K
AMPY icon
7522
PUT
Amplify Energy
AMPY
$163M
– –
-24
Closed -$15K
AMZA icon
7523
InfraCap MLP ETF
AMZA
$475M
$0 ﹤0.01%
+10
New +$326
ANIK icon
7524
Anika Therapeutics
ANIK
$198M
– –
-498
Closed -$20.1K
ANIK icon
7525
PUT
Anika Therapeutics
ANIK
$198M
– –
-89
Closed -$461K
299 300
301
302 303

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Simplex Trading's Q1 2020 Portfolio in Review

As of Q1 2020, Simplex Trading held 8,783 positions worth $56.7B, up 24% from $45.7B the previous quarter. Its ten largest holdings account for 50% of the portfolio.

Simplex Trading's Q1 2020 filing shows 1,512 new, 3,249 increased, 2,705 reduced and 1,159 closed positions. Its largest new stake was SPDR Gold Trust: 212,230 shares worth $31.4M. The largest sale was Alphabet (Google) Class C, an estimated $51.6M.

By sector, the portfolio is most concentrated in Technology at 0.49% of assets, down from 0.75% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q1 2020 buy was SPDR Gold Trust: 212,230 shares worth $31.4M.
  • Simplex Trading added most to JPMorgan Chase in Q1 2020, an estimated $24.5M increase.
  • Simplex Trading's biggest Q1 2020 reduction was Amazon, cutting an estimated $47.4M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2020, selling an estimated $51.6M.
  • Simplex Trading's ten largest holdings make up 50% of its $56.7B portfolio in Q1 2020.
  • Simplex Trading opened 1,512 new positions and closed 1,159 in Q1 2020.
  • Simplex Trading's portfolio value rose 24% quarter-over-quarter to $56.7B.

Based on Simplex Trading's 13F filing for Q1 2020, filed 29 Apr 2020.