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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
SLGL icon
9851
PUT
Sol-Gel Technologies
SLGL
$228M
– –
-100
Closed -$3K
SLNH icon
9852
Soluna Holdings
SLNH
$294M
$0 ﹤0.01%
148
-66
-31% -$348
SLP icon
9853
CALL
Simulations Plus
SLP
$373M
– –
-700
Closed -$30K
SLVP icon
9854
iShares MSCI Global Silver and Metals Miners ETF
SLVP
$1.03B
– –
-1,882
Closed -$21K
SLX icon
9855
VanEck Steel ETF
SLX
$174M
– –
-10,111
Closed -$644K
SMBK icon
9856
SmartFinancial
SMBK
$887M
– –
-300
Closed -$6.55K
SMBK icon
9857
PUT
SmartFinancial
SMBK
$887M
– –
-400
Closed -$9K
SMFG icon
9858
PUT
Sumitomo Mitsui Financial
SMFG
$173B
– –
-500
Closed -$4K
SMIN icon
9859
iShares MSCI India Small-Cap ETF
SMIN
$778M
– –
-100
Closed -$4K
SMN icon
9860
ProShares UltraShort Materials
SMN
$3.86M
– –
-178
Closed -$6K
SMTC icon
9861
Semtech
SMTC
$13.8B
– –
-2,591
Closed -$55.9K
SNCR
9862
DELISTED
Synchronoss Technologies
SNCR
$0 ﹤0.01%
15
-729
-98% -$6.14K
SNEX icon
9863
CALL
StoneX
SNEX
$8.38B
– –
-3,038
Closed -$62K
SNV
9864
DELISTED
Synovus
SNV
– –
-35,432
Closed -$1.04M
SOHU
9865
Sohu.com
SOHU
$358M
– –
-19,965
Closed -$253K
SONO icon
9866
Sonos
SONO
$1.82B
– –
-38,859
Closed -$689K
SOPH icon
9867
SOPHiA GENETICS
SOPH
$689M
$0 ﹤0.01%
+190
New +$859
SPDW icon
9868
State Street SPDR Portfolio Developed World ex-US ETF
SPDW
$42.7B
– –
-2,161
Closed -$69K
SPEM icon
9869
State Street SPDR Portfolio Emerging Markets ETF
SPEM
$18B
– –
-21
Closed –
SPIR icon
9870
PUT
Spire Global
SPIR
$487M
– –
-213
Closed -$1K
SPNT icon
9871
CALL
SiriusPoint
SPNT
$2.84B
– –
-1,200
Closed -$9K
SPNT icon
9872
PUT
SiriusPoint
SPNT
$2.84B
– –
-1,200
Closed -$9K
SPOK icon
9873
Spok Holdings
SPOK
$224M
– –
-4,579
Closed -$57.5K
SPRU icon
9874
PUT
Spruce Power Holding Corp
SPRU
$34.3M
– –
-238
Closed -$1K
SPTL icon
9875
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$11.1B
– –
-3,975
Closed -$122K
393 394
395
396 397

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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.