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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
+6.28%
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
$91.9B
AUM Growth
+$3.47B
Cap. Flow
+$1.91B
Cap. Flow %
2.08%
Top 10 Hldgs %
34.1%
Holding
11,206
New
1,219
Increased
3,365
Reduced
4,370
Closed
1,942

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$170M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$71.3M
3
T icon
AT&T
T
+$44.2M
4
META icon
Meta Platforms (Facebook)
META
+$37.1M
5
EEM icon
iShares MSCI Emerging Markets ETF
EEM
+$34.4M

Top Sells

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$94.3M
2
JPM icon
JPMorgan Chase
JPM
+$68.2M
3
C icon
Citigroup
C
+$62.8M
4
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$50.9M
5
GLD icon
SPDR Gold Trust
GLD
+$46.3M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 0.38%
2 Technology 0.35%
3 Communication Services 0.24%
4 Healthcare 0.2%
5 Consumer Staples 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PLYM
10126
DELISTED
Plymouth Industrial REIT
PLYM
– –
-300
Closed -$5K
PLYM
10127
PUT
DELISTED
Plymouth Industrial REIT
PLYM
– –
-400
Closed -$6K
PLYA
10128
PUT
DELISTED
Playa Hotels & Resorts
PLYA
– –
-4,200
Closed -$24K
PLXS icon
10129
CALL
Plexus
PLXS
$7B
– –
-800
Closed -$70K
PMVP icon
10130
CALL
PMV Pharmaceuticals
PMVP
$70.9M
– –
-700
Closed -$8K
PNFP icon
10131
CALL
Pinnacle Financial Partners Inc
PNFP
$15.1B
– –
-100
Closed -$8K
PNQI icon
10132
Invesco NASDAQ Internet ETF
PNQI
$495M
– –
-500
Closed -$11K
PNW icon
10133
Pinnacle West Capital
PNW
$12.8B
– –
-9,199
Closed -$657K
POR icon
10134
Portland General Electric
POR
$6.06B
– –
-626
Closed -$29K
POWL icon
10135
PUT
Powell Industries
POWL
$8.83B
– –
-900
Closed -$6K
PPBT
10136
Purple Biotech
PPBT
$1.3M
– –
-30
Closed -$11.5K
PPTA
10137
Perpetua Resources
PPTA
$2.23B
– –
-25,096
Closed -$54.5K
PPTA
10138
PUT
Perpetua Resources
PPTA
$2.23B
– –
-1,700
Closed -$3K
PRAA icon
10139
PRA Group
PRAA
$616M
– –
-3,689
Closed -$122K
PRAA icon
10140
PUT
PRA Group
PRAA
$616M
– –
-17,600
Closed -$578K
PRAX icon
10141
CALL
Praxis Precision Medicines
PRAX
$8.99B
– –
-440
Closed -$14K
PRDO icon
10142
PUT
Perdoceo Education
PRDO
$1.93B
– –
-5,200
Closed -$53K
PRI icon
10143
Primerica
PRI
$9.61B
$0 ﹤0.01%
+2
New +$279
PRIM icon
10144
Primoris Services
PRIM
$4.92B
– –
-256
Closed -$5.17K
PRLD icon
10145
CALL
Prelude Therapeutics
PRLD
$313M
– –
-4,400
Closed -$29K
PRLD icon
10146
Prelude Therapeutics
PRLD
$313M
– –
-470
Closed -$3K
PROF
10147
PUT
Profound Medical
PROF
$249M
– –
-300
Closed -$1K
PRPO icon
10148
CALL
Precipio
PRPO
$40.9M
– –
-170
Closed -$2K
PRPO icon
10149
Precipio
PRPO
$40.9M
$0 ﹤0.01%
63
+48
+320% +$722
PRSO icon
10150
CALL
Peraso
PRSO
$10.9M
– –
-43
Closed -$2K
404 405
406
407 408

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Simplex Trading's Q4 2022 Portfolio in Review

As of Q4 2022, Simplex Trading held 11,206 positions worth $91.9B, up 3.9% from $88.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.

Simplex Trading's Q4 2022 filing shows 1,219 new, 3,365 increased, 4,370 reduced and 1,942 closed positions. Its largest new stake was iShares MSCI Emerging Markets ETF: 932,756 shares worth $35.4M. The largest sale was Microsoft, an estimated $94.3M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 0.38% of assets, up from 0.3% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q4 2022 buy was iShares MSCI Emerging Markets ETF: 932,756 shares worth $35.4M.
  • Simplex Trading added most to Amazon in Q4 2022, an estimated $170M increase.
  • Simplex Trading's biggest Q4 2022 reduction was Microsoft, cutting an estimated $94.3M.
  • Simplex Trading fully exited JPMorgan Chase in Q4 2022, selling an estimated $68.2M.
  • Simplex Trading's ten largest holdings make up 34% of its $91.9B portfolio in Q4 2022.
  • Simplex Trading opened 1,219 new positions and closed 1,942 in Q4 2022.
  • Simplex Trading's portfolio value rose 3.9% quarter-over-quarter to $91.9B.

Based on Simplex Trading's 13F filing for Q4 2022, filed 2 Feb 2023.