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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
MDU icon
9526
CALL
MDU Resources
MDU
$4.12B
– –
-27,877
Closed -$323K
MDXG icon
9527
MiMedx Group
MDXG
$666M
– –
-6,998
Closed -$35.7K
MDY icon
9528
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.5B
– –
-2,821
Closed -$1.28M
MEC icon
9529
Mayville Engineering Co
MEC
$501M
– –
-3,045
Closed -$38.5K
MED icon
9530
Medifast
MED
$141M
– –
-2,788
Closed -$248K
MEDP icon
9531
Medpace
MEDP
$16.5B
– –
-175
Closed -$36.4K
ONT
9532
CALL
Onterris Inc
ONT
$627M
– –
-100
Closed -$3K
MERC icon
9533
PUT
Mercer International
MERC
$25.3M
– –
-300
Closed -$2K
METC icon
9534
Ramaco Resources Class A
METC
$837M
– –
-2,357
Closed -$19.6K
MFG icon
9535
CALL
Mizuho Financial
MFG
$136B
– –
-500
Closed -$1K
MGK icon
9536
Vanguard Morningstar Mega Cap Growth ETF
MGK
$33.6B
– –
-2,975
Closed -$121K
MHK icon
9537
Mohawk Industries
MHK
$9.05B
– –
-2,404
Closed -$236K
MIST icon
9538
CALL
Milestone Pharmaceuticals
MIST
$149M
– –
-1,200
Closed -$4K
MLI icon
9539
Mueller Industries
MLI
$14.1B
– –
-2,508
Closed -$47.7K
MLPA icon
9540
Global X MLP ETF
MLPA
$2.39B
– –
-1,416
Closed -$58K
MLSS icon
9541
Milestone Scientific
MLSS
$41.6M
$0 ﹤0.01%
+488
New +$440
MMS icon
9542
Maximus
MMS
$3.02B
– –
-636
Closed -$52.3K
MMSI icon
9543
PUT
Merit Medical Systems
MMSI
$5.35B
– –
-800
Closed -$59K
MMYT icon
9544
PUT
MakeMyTrip
MMYT
$5.23B
– –
-300
Closed -$7K
MNDO icon
9545
Mind CTI
MNDO
$20.4M
– –
-158
Closed –
MNDY icon
9546
monday.com
MNDY
$3.85B
– –
-2,806
Closed -$419K
MNTS icon
9547
Momentus
MNTS
$91.8M
– –
0
– –
MNTS icon
9548
PUT
Momentus
MNTS
$91.8M
– –
-1
Closed -$3K
MOH icon
9549
Molina Healthcare
MOH
$10.5B
– –
-1,727
Closed -$496K
MOMO
9550
Hello Group
MOMO
$710M
– –
-3,693
Closed -$32.5K
380 381
382
383 384

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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.