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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
MRCC
9551
DELISTED
Monroe Capital Corp
MRCC
– –
-1
Closed -$8
MRCY icon
9552
Mercury Systems
MRCY
$6.37B
– –
-3,038
Closed -$130K
MRTN icon
9553
PUT
Marten Transport
MRTN
$1.37B
– –
-500
Closed -$10K
MRUS
9554
DELISTED
Merus
MRUS
– –
-15,777
Closed -$345K
MSBI icon
9555
Midland States Bancorp
MSBI
$642M
– –
-85
Closed -$1K
MSBI icon
9556
PUT
Midland States Bancorp
MSBI
$642M
– –
-200
Closed -$4K
MSEX icon
9557
CALL
Middlesex Water
MSEX
$1.05B
– –
-1,800
Closed -$140K
MTG icon
9558
MGIC Investment
MTG
$6.1B
– –
-3,150
Closed -$46.7K
MTN icon
9559
Vail Resorts
MTN
$5.12B
– –
-1,289
Closed -$314K
MTRN icon
9560
PUT
Materion
MTRN
$5.15B
– –
-900
Closed -$104K
MTW icon
9561
Manitowoc
MTW
$504M
– –
-55,552
Closed -$896K
MXCT icon
9562
CALL
MaxCyte
MXCT
$118M
– –
-400
Closed -$1K
MXI icon
9563
iShares Global Materials ETF
MXI
$335M
– –
-772
Closed -$64K
LUXE
9564
CALL
LuxExperience B.V.
LUXE
$1.07B
– –
-300
Closed -$2K
LUXE
9565
LuxExperience B.V.
LUXE
$1.07B
$0 ﹤0.01%
224
+137
+157% +$652
NAAS
9566
NaaS Technology Inc
NAAS
$35.9M
– –
-37
Closed -$90.5K
NABL icon
9567
PUT
N-able
NABL
$746M
– –
-1,000
Closed -$13K
NATR icon
9568
CALL
Nature's Sunshine
NATR
$357M
– –
-3,500
Closed -$35K
NATR icon
9569
PUT
Nature's Sunshine
NATR
$357M
– –
-100
Closed -$1K
NAUT icon
9570
Nautilus Biotechnolgy
NAUT
$222M
– –
-61,113
Closed -$176K
NBHC icon
9571
National Bank Holdings
NBHC
$1.91B
– –
-78
Closed -$2K
NBHC icon
9572
PUT
National Bank Holdings
NBHC
$1.91B
– –
-100
Closed -$3K
NBTB icon
9573
NBT Bancorp
NBTB
$2.66B
$0 ﹤0.01%
+5
New +$167
NBTB icon
9574
PUT
NBT Bancorp
NBTB
$2.66B
– –
-400
Closed -$13K
NDSN icon
9575
PUT
Nordson
NDSN
$16.3B
– –
-100
Closed -$22K
381 382
383
384 385

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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.