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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
-$49.6M
Cap. Flow %
-0.04%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,663
Reduced
3,631
Closed
1,728

Top Buys

Rank Stock Value
1
WMT icon
Walmart Inc
WMT
+$43.6M
2
AAPL icon
Apple
AAPL
+$40.9M
3
OIH icon
VanEck Oil Services ETF
OIH
+$37.7M
4
C icon
Citigroup
C
+$34.2M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$32.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$189M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$123M
3
NVDA icon
NVIDIA
NVDA
+$115M
4
TSLA icon
Tesla
TSLA
+$52M
5
META icon
Meta Platforms (Facebook)
META
+$49M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.51%
2 Technology 0.42%
3 Consumer Discretionary 0.2%
4 Healthcare 0.17%
5 Industrials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SLYG icon
10026
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$5.02B
$0 ﹤0.01%
+2
New +$151
SMDD icon
10027
ProShares UltraPro Short MidCap400
SMDD
$1.83M
– –
-45
Closed -$2K
SMG icon
10028
ScottsMiracle-Gro
SMG
$3.46B
– –
-41,454
Closed -$2.98M
SMRT icon
10029
SmartRent
SMRT
$255M
– –
-871
Closed -$2.33K
SMSI icon
10030
Smith Micro Software
SMSI
$15.9M
– –
-1,593
Closed -$143K
SMWB icon
10031
Similarweb
SMWB
$780M
– –
-59,827
Closed -$384K
SMWB icon
10032
PUT
Similarweb
SMWB
$780M
– –
-151,300
Closed -$972K
SNAP icon
10033
Snap
SNAP
$9.25B
– –
-346,497
Closed -$3.64M
SNDX icon
10034
Syndax Pharmaceuticals
SNDX
$1.84B
– –
-212
Closed -$5.27K
SNDX icon
10035
PUT
Syndax Pharmaceuticals
SNDX
$1.84B
– –
-100
Closed -$2K
SOGP
10036
CALL
Sound Group
SOGP
$49.9M
– –
-270
Closed -$1K
SOGP
10037
PUT
Sound Group
SOGP
$49.9M
– –
-310
Closed -$1K
SON icon
10038
Sonoco
SON
$5.14B
– –
-32,323
Closed -$1.92M
SONY icon
10039
Sony
SONY
$143B
– –
-120,290
Closed -$2.08M
SOUN icon
10040
SoundHound AI
SOUN
$2.99B
– –
-12,250
Closed -$28.9K
SOXL icon
10041
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$20.1B
– –
-60,718
Closed -$587K
SPDN icon
10042
Direxion Daily S&P 500 Bear 1X ETF
SPDN
$215M
$0 ﹤0.01%
32
-6,587
-100% -$105K
SPEM icon
10043
State Street SPDR Portfolio Emerging Markets ETF
SPEM
$18B
$0 ﹤0.01%
+21
New +$722
SPG icon
10044
Simon Property Group
SPG
$67.8B
– –
-29,589
Closed -$3.53M
SPGI icon
10045
S&P Global
SPGI
$131B
– –
-2,381
Closed -$838K
SPGP icon
10046
Invesco S&P 500 GARP ETF
SPGP
$2.24B
– –
-400
Closed -$33K
SPHB icon
10047
Invesco S&P 500 High Beta ETF
SPHB
$914M
– –
-1,397
Closed -$87K
SPIR icon
10048
Spire Global
SPIR
$487M
– –
-2,789
Closed -$22.3K
SPNS
10049
CALL
DELISTED
Sapiens International
SPNS
– –
-200
Closed -$3K
SPRO icon
10050
Spero Therapeutics
SPRO
$70.5M
– –
-9,206
Closed -$15.4K
400 401
402
403 404

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Simplex Trading's Q1 2023 Portfolio in Review

As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.

Simplex Trading's Q1 2023 filing shows 1,536 new, 3,663 increased, 3,631 reduced and 1,728 closed positions. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M. The largest sale was Amazon, an estimated $189M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
  • Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
  • Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
  • Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
  • Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
  • Simplex Trading opened 1,536 new positions and closed 1,728 in Q1 2023.
  • Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.

Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.