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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
KCCA icon
9451
KraneShares California Carbon Allowance Strategy ETF
KCCA
$115M
– –
-36
Closed –
KD icon
9452
Kyndryl
KD
$2.57B
– –
-17,484
Closed -$237K
KEP icon
9453
CALL
Korea Electric Power
KEP
$15.5B
– –
-1,700
Closed -$11K
KEY icon
9454
KeyCorp
KEY
$24.4B
– –
-261,713
Closed -$2.73M
KFY icon
9455
Korn Ferry
KFY
$3.96B
– –
-17
Closed -$836
NXDR
9456
Nextdoor Holdings
NXDR
$847M
– –
-7,238
Closed -$17.9K
KMPR icon
9457
Kemper
KMPR
$1.63B
$0 ﹤0.01%
+17
New +$823
KNDI
9458
Kandi Technologies Group
KNDI
$65.9M
– –
-10,411
Closed -$35.2K
KNSA icon
9459
Kiniksa Pharmaceuticals
KNSA
$4.85B
– –
-395
Closed -$5.29K
KNSA icon
9460
PUT
Kiniksa Pharmaceuticals
KNSA
$4.85B
– –
-400
Closed -$4K
KNTK icon
9461
CALL
Kinetik
KNTK
$3.81B
– –
-4,200
Closed -$131K
KODK icon
9462
Kodak
KODK
$788M
– –
-22,338
Closed -$94.2K
KOF icon
9463
Coca-Cola Femsa
KOF
$21.5B
– –
-7,835
Closed -$671K
KOS icon
9464
Kosmos Energy
KOS
$1.63B
– –
-29,338
Closed -$191K
KR icon
9465
Kroger
KR
$34.2B
– –
-22,125
Closed -$1.06M
KRE icon
9466
State Street SPDR S&P Regional Banking ETF
KRE
$4.82B
– –
-261,312
Closed -$11.5M
KRO icon
9467
KRONOS Worldwide
KRO
$764M
– –
-504
Closed -$4.44K
KRRO icon
9468
CALL
Korro Bio
KRRO
$166M
– –
-44
Closed -$1K
KRRO icon
9469
Korro Bio
KRRO
$166M
– –
-1,629
Closed -$31.6K
KTCC icon
9470
Key Tronic
KTCC
$39.5M
– –
-3,638
Closed -$26K
KURA icon
9471
CALL
Kura Oncology
KURA
$928M
– –
-200
Closed -$2K
KW
9472
DELISTED
Kennedy-Wilson Holdings
KW
– –
-5,131
Closed -$82K
KWR icon
9473
Quaker Houghton
KWR
$2.58B
– –
-97
Closed -$19K
KXIN icon
9474
Kaixin Holdings
KXIN
$8.8M
– –
0
– –
L icon
9475
Loews
L
$23.8B
– –
-43,386
Closed -$2.51M
377 378
379
380 381

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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.