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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

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 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
LABD icon
9476
Direxion Daily S&P Biotech Bear 3X ETF
LABD
$63.1M
– –
-728
Closed -$149K
LABU icon
9477
Direxion Daily S&P Biotech Bull 3X ETF
LABU
$590M
– –
-1,107
Closed -$108K
LAD icon
9478
Lithia Motors
LAD
$7.62B
– –
-2,961
Closed -$709K
LAKE icon
9479
Lakeland Industries
LAKE
$107M
– –
-9,897
Closed -$124K
LAKE icon
9480
PUT
Lakeland Industries
LAKE
$107M
– –
-28,400
Closed -$414K
LAUR icon
9481
CALL
Laureate Education
LAUR
$5.12B
– –
-300
Closed -$3K
LAW icon
9482
CALL
CS Disco
LAW
$226M
– –
-300
Closed -$1K
LAZR
9483
DELISTED
Luminar Technologies
LAZR
– –
-99
Closed -$9.35K
LBRT icon
9484
Liberty Energy
LBRT
$3.2B
– –
-7,006
Closed -$90.8K
LCTX icon
9485
CALL
Lineage Cell Therapeutics
LCTX
$267M
– –
-28,600
Closed -$42K
LDTC
9486
DELISTED
LeddarTech
LDTC
$0 ﹤0.01%
2
-121,008
-100% -$618K
LE icon
9487
CALL
Lands' End
LE
$358M
– –
-69,200
Closed -$672K
LGHL
9488
CALL
Lion Group Holding
LGHL
$1.14M
– –
0
– -$9K
LGMK
9489
CALL
DELISTED
LogicMark
LGMK
– –
-230
Closed -$17K
LGMK
9490
DELISTED
LogicMark
LGMK
– –
-7
Closed –
LII icon
9491
Lennox International
LII
$18.7B
– –
-104
Closed -$29.4K
LILAK icon
9492
PUT
Liberty Latin America Class C
LILAK
$1.49B
– –
-2,860
Closed -$20K
LIN icon
9493
Linde
LIN
$234B
– –
-8,823
Closed -$3.22M
LIND icon
9494
CALL
Lindblad Expeditions
LIND
$1.77B
– –
-4,400
Closed -$42K
LIND icon
9495
Lindblad Expeditions
LIND
$1.77B
– –
-58,072
Closed -$596K
LMB icon
9496
PUT
Limbach Holdings
LMB
$884M
– –
-1,100
Closed -$19K
LMFA
9497
DELISTED
LM Funding America
LMFA
– –
-6
Closed –
LMNR icon
9498
Limoneira
LMNR
$238M
$0 ﹤0.01%
+9
New +$148
LMNR icon
9499
PUT
Limoneira
LMNR
$238M
– –
-2,800
Closed -$46K
LNSR icon
9500
LENSAR
LNSR
$70.7M
– –
-89
Closed -$271
378 379
380
381 382

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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, 3,350 increased, 3,913 reduced and 1,517 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 Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • 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 1,517 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.