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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
LOCL icon
9501
CALL
Local Bounti
LOCL
$26.2M
– –
-2,262
Closed -$23K
LOOP icon
9502
PUT
Loop Industries
LOOP
$23.1M
– –
-13,800
Closed -$47K
LOPE icon
9503
Grand Canyon Education
LOPE
$3.98B
– –
-1,584
Closed -$174K
LOPE icon
9504
PUT
Grand Canyon Education
LOPE
$3.98B
– –
-2,100
Closed -$239K
LPCN icon
9505
CALL
Lipocine
LPCN
$20.2M
– –
-1,471
Closed -$7K
LPL icon
9506
LG Display
LPL
$3.3B
– –
-231
Closed -$1K
LPX icon
9507
Louisiana-Pacific
LPX
$4.77B
– –
-4,337
Closed -$268K
LQDT icon
9508
PUT
Liquidity Services
LQDT
$1.32B
– –
-1,000
Closed -$13K
LRMR icon
9509
Larimar Therapeutics
LRMR
$398M
– –
-161
Closed -$657
LTC
9510
LTC Properties
LTC
$2.22B
– –
-3,019
Closed -$101K
LTRN icon
9511
CALL
Lantern Pharma
LTRN
$24.4M
– –
-4,700
Closed -$22K
LTRX icon
9512
CALL
Lantronix
LTRX
$244M
– –
-1,000
Closed -$4K
SEGG
9513
Sports Entertainment Gaming Global Corp
SEGG
$8.9M
– –
-3
Closed -$1K
LYEL icon
9514
Lyell Immunopharma
LYEL
$352M
– –
-1
Closed -$55
LYFT icon
9515
Lyft
LYFT
$6.33B
– –
-103,314
Closed -$993K
LYG icon
9516
CALL
Lloyds Banking Group
LYG
$88B
– –
-74,800
Closed -$173K
M icon
9517
Macy's
M
$6.06B
– –
-75,943
Closed -$1.21M
MAGA icon
9518
Truth Social America First ETF
MAGA
$31.5M
– –
-1,400
Closed -$52K
MAN icon
9519
CALL
ManpowerGroup
MAN
$2.88B
– –
-100
Closed -$8K
MAXN
9520
DELISTED
Maxeon Solar Technologies
MAXN
– –
-472
Closed -$1.35M
MBB icon
9521
iShares MBS ETF
MBB
$39.5B
– –
-7,640
Closed -$723K
MBIO icon
9522
Mustang Bio
MBIO
$4.11M
– –
0
– –
MBWM icon
9523
CALL
Mercantile Bank Corp
MBWM
$1.07B
– –
-1,000
Closed -$30K
MC icon
9524
Moelis & Co
MC
$5.11B
– –
-838
Closed -$33.4K
MDLZ icon
9525
Mondelez International
MDLZ
$78.2B
– –
-7,018
Closed -$518K
379 380
381
382 383

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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.