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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
IMMP
8626
Immutep
IMMP
$56.7M
$1K ﹤0.01%
+506
New +$947
IMMP
8627
PUT
Immutep
IMMP
$56.7M
$1K ﹤0.01%
+900
New +$1.68K
HYFT
8628
CALL
MindWalk Holdings
HYFT
$63.5M
$1K ﹤0.01%
500
-33,400
-99% -$97.1K
ISRA icon
8629
VanEck Israel ETF
ISRA
$152M
$1K ﹤0.01%
+50
New +$1.77K
JOBY icon
8630
Joby Aviation
JOBY
$6.82B
$1K ﹤0.01%
100
– –
JSPR icon
8631
Jasper Therapeutics
JSPR
$22.9M
$1K ﹤0.01%
+92
New +$1.37K
KCE icon
8632
State Street SPDR S&P Capital Markets ETF
KCE
$453M
$1K ﹤0.01%
+20
New +$1.63K
KMDA icon
8633
CALL
Kamada
KMDA
$407M
$1K ﹤0.01%
+300
New +$1.48K
LAB icon
8634
PUT
Standard BioTools
LAB
$326M
$1K ﹤0.01%
1,000
-20,600
-95% -$40.7K
LCTX icon
8635
Lineage Cell Therapeutics
LCTX
$257M
$1K ﹤0.01%
+1,383
New +$1.91K
LCUT icon
8636
CALL
Lifetime Brands
LCUT
$199M
$1K ﹤0.01%
+200
New +$1.02K
LCUT icon
8637
PUT
Lifetime Brands
LCUT
$199M
$1K ﹤0.01%
+200
New +$1.02K
LOCO icon
8638
PUT
El Pollo Loco
LOCO
$485M
$1K ﹤0.01%
200
-1,100
-85% -$10.3K
LOOP icon
8639
CALL
Loop Industries
LOOP
$38.9M
$1K ﹤0.01%
400
-10,500
-96% -$32.3K
LSAK icon
8640
CALL
Lesaka Technologies
LSAK
$388M
$1K ﹤0.01%
500
-500
-50% -$1.92K
LXP icon
8641
LXP Industrial Trust
LXP
$3.53B
$1K ﹤0.01%
21
-34
-62% -$1.68K
LYTS icon
8642
CALL
LSI Industries
LYTS
$853M
$1K ﹤0.01%
100
-100
-50% -$1.25K
MASS icon
8643
PUT
908 Devices
MASS
$293M
$1K ﹤0.01%
+200
New +$1.61K
MLKN icon
8644
MillerKnoll
MLKN
$1.5B
$1K ﹤0.01%
79
-1,849
-96% -$29.5K
MLNK
8645
DELISTED
MeridianLink
MLNK
$1K ﹤0.01%
50
-211
-81% -$3.77K
MLSS icon
8646
PUT
Milestone Scientific
MLSS
$34.5M
$1K ﹤0.01%
+2,000
New +$1.8K
MREO
8647
PUT
Mereo BioPharma
MREO
$45.9M
$1K ﹤0.01%
+1,000
New +$1.16K
MSA icon
8648
Mine Safety
MSA
$6.74B
$1K ﹤0.01%
+10
New +$1.43K
MWA icon
8649
PUT
Mueller Water Products
MWA
$3.92B
$1K ﹤0.01%
100
– –
NB
8650
NioCorp Developments
NB
$603M
$1K ﹤0.01%
+379
New +$2.16K
344 345
346
347 348

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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.