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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
+$86.7M
Cap. Flow %
0.07%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,349
Reduced
3,911
Closed
1,518

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.43%
2 Technology 0.41%
3 Healthcare 0.21%
4 Consumer Discretionary 0.21%
5 Communication Services 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
HOMB icon
9351
CALL
Home BancShares
HOMB
$6.03B
– –
-11,000
Closed -$238K
HOMB icon
9352
PUT
Home BancShares
HOMB
$6.03B
– –
-600
Closed -$13K
HOOK
9353
CALL
DELISTED
HOOKIPA Pharma
HOOK
– –
-1,280
Closed -$9K
HONE
9354
DELISTED
HarborOne Bancorp
HONE
$0 ﹤0.01%
+71
New +$678
HPP
9355
Hudson Pacific Properties
HPP
$684M
– –
-173
Closed -$6.19K
HRL icon
9356
Hormel Foods
HRL
$11.9B
– –
-2,248
Closed -$90.2K
HROW icon
9357
Harrow
HROW
$1.44B
– –
-3,068
Closed -$67.5K
HRTG icon
9358
CALL
Heritage Insurance Holdings
HRTG
$1.01B
– –
-14,900
Closed -$45K
HRTX icon
9359
CALL
Heron Therapeutics
HRTX
$65.3M
– –
-4,400
Closed -$6K
HSBC icon
9360
HSBC
HSBC
$367B
– –
-300
Closed -$11.2K
HSTM icon
9361
CALL
HealthStream
HSTM
$854M
– –
-200
Closed -$5K
HTLD icon
9362
CALL
Heartland Express
HTLD
$962M
– –
-1,000
Closed -$15K
HTZ icon
9363
Hertz
HTZ
$820M
– –
-33,227
Closed -$545K
HUBB icon
9364
Hubbell
HUBB
$24.3B
– –
-353
Closed -$97.7K
HUBG icon
9365
CALL
HUB Group
HUBG
$2.24B
– –
-2,800
Closed -$117K
HUBG icon
9366
PUT
HUB Group
HUBG
$2.24B
– –
-200
Closed -$8K
HURN icon
9367
Huron Consulting
HURN
$2.47B
– –
-854
Closed -$68K
HURN icon
9368
PUT
Huron Consulting
HURN
$2.47B
– –
-1,400
Closed -$112K
HVT icon
9369
Haverty Furniture Companies
HVT
$445M
– –
-236
Closed -$7K
HWC icon
9370
PUT
Hancock Whitney
HWC
$6.08B
– –
-800
Closed -$29K
HWKN icon
9371
PUT
Hawkins
HWKN
$2.7B
– –
-700
Closed -$30K
HXL icon
9372
Hexcel
HXL
$6.96B
– –
-421
Closed -$30K
HYD icon
9373
VanEck High Yield Muni ETF
HYD
$4.26B
– –
-11,190
Closed -$578K
IAGG icon
9374
iShares Core International Aggregate Bond Fund
IAGG
$11.9B
– –
-100
Closed -$4K
IAS
9375
CALL
DELISTED
Integral Ad Science
IAS
– –
-300
Closed -$4K
373 374
375
376 377

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,349 increased, 3,911 reduced and 1,518 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

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

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,518 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.