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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
PKOH icon
9701
PUT
Park-Ohio Holdings
PKOH
$542M
– –
-1,000
Closed -$12K
PLCE icon
9702
Children's Place
PLCE
$60.3M
– –
-7,246
Closed -$184K
PLL
9703
DELISTED
Piedmont Lithium
PLL
– –
-5,314
Closed -$304K
PLRX icon
9704
Pliant Therapeutics
PLRX
$66.3M
– –
-1,776
Closed -$42K
PLYM
9705
CALL
DELISTED
Plymouth Industrial REIT
PLYM
– –
-500
Closed -$10K
PM icon
9706
Philip Morris
PM
$301B
– –
-28,987
Closed -$2.77M
PMT
9707
PennyMac Mortgage Investment
PMT
$853M
– –
-644
Closed -$7.88K
POET icon
9708
PUT
POET Technologies
POET
$1.37B
– –
-2,000
Closed -$7K
POR icon
9709
PUT
Portland General Electric
POR
$6.08B
– –
-100
Closed -$4K
PPBI
9710
PUT
DELISTED
Pacific Premier Bancorp
PPBI
– –
-200
Closed -$4K
PPBT
9711
CALL
Purple Biotech
PPBT
$1.25M
– –
-50
Closed -$17K
PPH icon
9712
VanEck Pharmaceutical ETF
PPH
$928M
– –
-70
Closed -$5K
PRCT icon
9713
PUT
Procept Biorobotics
PRCT
$997M
– –
-700
Closed -$19K
PRDO icon
9714
CALL
Perdoceo Education
PRDO
$1.87B
– –
-3,000
Closed -$40K
PRG icon
9715
CALL
PROG Holdings
PRG
$1.74B
– –
-11,800
Closed -$280K
PRIM icon
9716
PUT
Primoris Services
PRIM
$4.97B
– –
-800
Closed -$19K
PRM icon
9717
PUT
Perimeter Solutions
PRM
$5.54B
– –
-400
Closed -$3K
PRO
9718
DELISTED
PROS Holdings
PRO
– –
-966
Closed -$27.2K
PRO
9719
PUT
DELISTED
PROS Holdings
PRO
– –
-10,100
Closed -$276K
PRPO icon
9720
Precipio
PRPO
$41.9M
$0 ﹤0.01%
2
-22
-92% -$249
ALP
9721
Alpha Compute
ALP
$5.6M
– –
-16
Closed -$1K
ALP
9722
PUT
Alpha Compute
ALP
$5.6M
– –
-20
Closed -$1K
PSMT icon
9723
Pricesmart
PSMT
$5.67B
– –
-17
Closed -$1K
PSMT icon
9724
PUT
Pricesmart
PSMT
$5.67B
– –
-2,400
Closed -$171K
PSNL icon
9725
Personalis
PSNL
$1.35B
$0 ﹤0.01%
385
-666
-63% -$1.5K
387 388
389
390 391

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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.