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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
SATO icon
9801
Invesco Alerian Galaxy Crypto Economy ETF
SATO
$8.51M
$0 ﹤0.01%
+68
New +$501
ECHO
9802
EchoStar
ECHO
$26.1B
– –
-94
Closed -$1.58K
ECHO
9803
PUT
EchoStar
ECHO
$26.1B
– –
-700
Closed -$12K
SBS icon
9804
PUT
Sabesp
SBS
$18.1B
– –
-52,597
Closed -$102K
SCHB icon
9805
Schwab US Broad Market ETF
SCHB
$44.8B
– –
-3,477
Closed -$56.7K
SCHD icon
9806
Schwab US Dividend Equity ETF
SCHD
$112B
– –
-13,617
Closed -$332K
SCHW
9807
Charles Schwab
SCHW
$189B
– –
-242,679
Closed -$12.7M
SCL icon
9808
CALL
Stepan Co
SCL
$1.44B
– –
-300
Closed -$30K
SCM icon
9809
Stellus Capital Investment Corp
SCM
$250M
– –
-1,240
Closed -$17.6K
SCO icon
9810
ProShares UltraShort Bloomberg Crude Oil
SCO
$801M
– –
-2,516
Closed -$253K
SCOR icon
9811
CALL
Comscore
SCOR
$78.5M
– –
-115
Closed -$2K
SHOE
9812
CALL
Shoe Station Group
SHOE
$382M
– –
-1,500
Closed -$38K
SCYX icon
9813
SCYNEXIS
SCYX
$52.7M
– –
-8,858
Closed -$207K
SDD icon
9814
ProShares UltraShort SmallCap600
SDD
$1.38M
– –
-340
Closed -$8K
SDOW icon
9815
ProShares UltraPro Short Dow 30
SDOW
$161M
– –
-15
Closed -$1K
SEAT icon
9816
CALL
Vivid Seats
SEAT
$67.9M
– –
-2,410
Closed -$367K
SEER icon
9817
CALL
Seer Inc
SEER
$108M
– –
-4,400
Closed -$16K
SEER icon
9818
Seer Inc
SEER
$108M
$0 ﹤0.01%
+63
New +$246
SEF icon
9819
ProShares Short Financials
SEF
$13M
– –
-384
Closed -$20K
SEIC icon
9820
PUT
SEI Investments
SEIC
$13.2B
– –
-200
Closed -$11K
SEM
9821
PUT
DELISTED
Select Medical
SEM
– –
-10,950
Closed -$152K
SEMR
9822
PUT
DELISTED
Semrush
SEMR
– –
-900
Closed -$9K
SENS icon
9823
Senseonics Holdings Inc
SENS
$509M
– –
-6,088
Closed -$83.4K
SES icon
9824
CALL
SES AI
SES
$187M
– –
-7,700
Closed -$22K
SES icon
9825
PUT
SES AI
SES
$187M
– –
-14,100
Closed -$41K
391 392
393
394 395

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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.