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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
-4.86%
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
$88.5B
AUM Growth
-$5.62B
Cap. Flow
-$2.04B
Cap. Flow %
-2.3%
Top 10 Hldgs %
38.07%
Holding
11,570
New
1,564
Increased
4,281
Reduced
3,851
Closed
1,575

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$114M
2
NVDA icon
NVIDIA
NVDA
+$85.9M
3
C icon
Citigroup
C
+$61.5M
4
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$45.5M
5
PFE icon
Pfizer
PFE
+$41.6M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$467M
2
VOO icon
Vanguard S&P 500 ETF
VOO
+$71.2M
3
META icon
Meta Platforms (Facebook)
META
+$47.6M
4
INTC icon
Intel
INTC
+$41.9M
5
TSM icon
TSMC
TSM
+$35.9M

Sector Composition

Rank Sector Weight
1 Technology 0.51%
2 Financials 0.35%
3 Consumer Discretionary 0.3%
4 Healthcare 0.25%
5 Industrials 0.18%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PRLD icon
9126
Prelude Therapeutics
PRLD
$305M
$3K ﹤0.01%
+470
New +$3.17K
PRLB icon
9127
PUT
Protolabs
PRLB
$1.86B
$3K ﹤0.01%
100
-3,800
-97% -$165K
PRPH
9128
CALL
DELISTED
ProPhase Labs
PRPH
$3K ﹤0.01%
30
-80
-73% -$9.31K
AIXC
9129
CALL
AIxCrypto Holdings Inc
AIXC
$16.6M
$3K ﹤0.01%
23
-22
-49% -$4.39K
RCEL icon
9130
CALL
Avita Medical
RCEL
$142M
$3K ﹤0.01%
+700
New +$4.32K
RCMT icon
9131
PUT
RCM Technologies
RCMT
$196M
$3K ﹤0.01%
200
-800
-80% -$13.9K
RDN icon
9132
PUT
Radian Group
RDN
$5.14B
$3K ﹤0.01%
200
– –
RFL icon
9133
Rafael Holdings
RFL
$111M
$3K ﹤0.01%
+1,861
New +$3.92K
RGP icon
9134
CALL
Resources Connection
RGP
$129M
$3K ﹤0.01%
200
-300
-60% -$6.01K
RGP icon
9135
PUT
Resources Connection
RGP
$129M
$3K ﹤0.01%
+200
New +$4.01K
RDNW
9136
PUT
RideNow Group
RDNW
$247M
$3K ﹤0.01%
200
-13,100
-98% -$264K
RPTX
9137
PUT
DELISTED
Repare Therapeutics
RPTX
$3K ﹤0.01%
+300
New +$3.86K
SDP icon
9138
ProShares UltraShort Utilities
SDP
$3.79M
$3K ﹤0.01%
+62
New +$2.71K
SEER icon
9139
PUT
Seer Inc
SEER
$108M
$3K ﹤0.01%
500
-300
-38% -$2.91K
OLOX
9140
CALL
Olenox Industries
OLOX
$7.29M
– –
-1
Closed -$11.7K
SHYG icon
9141
iShares 0-5 Year High Yield Corporate Bond ETF
SHYG
$7.57B
$3K ﹤0.01%
100
-300
-75% -$12.4K
SNCR
9142
DELISTED
Synchronoss Technologies
SNCR
$3K ﹤0.01%
320
-150
-32% -$1.91K
SNPE icon
9143
Xtrackers S&P 500 ESG ETF
SNPE
$2.57B
$3K ﹤0.01%
100
-100
-50% -$3.58K
SPIR icon
9144
PUT
Spire Global
SPIR
$425M
$3K ﹤0.01%
375
-4,188
-92% -$45.4K
SUPN icon
9145
PUT
Supernus Pharmaceuticals
SUPN
$2.68B
$3K ﹤0.01%
100
-200
-67% -$6.51K
TCX icon
9146
PUT
Tucows
TCX
$97.1M
$3K ﹤0.01%
+100
New +$4.59K
TLS icon
9147
CALL
Telos
TLS
$337M
$3K ﹤0.01%
400
-20,800
-98% -$192K
TRUE
9148
PUT
DELISTED
TrueCar
TRUE
$3K ﹤0.01%
2,500
-295,500
-99% -$674K
TSQ icon
9149
Townsquare Media
TSQ
$113M
$3K ﹤0.01%
+536
New +$4.55K
TTSH
9150
DELISTED
Tile Shop Holdings
TTSH
$3K ﹤0.01%
928
+769
+484% +$2.76K
364 365
366
367 368

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Simplex Trading's Q3 2022 Portfolio in Review

As of Q3 2022, Simplex Trading held 11,570 positions worth $88.5B, down 6% from $94.1B the previous quarter. Its ten largest holdings account for 38% of the portfolio.

Simplex Trading's Q3 2022 filing shows 1,564 new, 4,281 increased, 3,851 reduced and 1,575 closed positions. Its largest new stake was Microsoft: 432,062 shares worth $101M. The largest sale was Apple, an estimated $467M.

By sector, the portfolio is most concentrated in Technology at 0.51% of assets, down from 0.84% a quarter earlier, followed by Financials and Consumer Discretionary.

  • Simplex Trading's largest Q3 2022 buy was Microsoft: 432,062 shares worth $101M.
  • Simplex Trading added most to NVIDIA in Q3 2022, an estimated $85.9M increase.
  • Simplex Trading's biggest Q3 2022 reduction was Apple, cutting an estimated $467M.
  • Simplex Trading fully exited iShares Core S&P 500 ETF in Q3 2022, selling an estimated $34.3M.
  • Simplex Trading's ten largest holdings make up 38% of its $88.5B portfolio in Q3 2022.
  • Simplex Trading opened 1,564 new positions and closed 1,575 in Q3 2022.
  • Simplex Trading's portfolio value fell 6% quarter-over-quarter to $88.5B.

Based on Simplex Trading's 13F filing for Q3 2022, filed 4 Nov 2022.