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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
-$49.6M
Cap. Flow %
-0.04%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,663
Reduced
3,631
Closed
1,728

Top Buys

Rank Stock Value
1
WMT icon
Walmart Inc
WMT
+$43.6M
2
AAPL icon
Apple
AAPL
+$40.9M
3
OIH icon
VanEck Oil Services ETF
OIH
+$37.7M
4
C icon
Citigroup
C
+$34.2M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$32.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$189M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$123M
3
NVDA icon
NVIDIA
NVDA
+$115M
4
TSLA icon
Tesla
TSLA
+$52M
5
META icon
Meta Platforms (Facebook)
META
+$49M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.51%
2 Technology 0.42%
3 Consumer Discretionary 0.2%
4 Healthcare 0.17%
5 Industrials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ROAD icon
9951
PUT
Construction Partners
ROAD
$5.94B
– –
-500
Closed -$13K
ROCK icon
9952
CALL
Gibraltar Industries
ROCK
$1.4B
– –
-700
Closed -$32K
ROCK icon
9953
PUT
Gibraltar Industries
ROCK
$1.4B
– –
-100
Closed -$4K
ROK icon
9954
Rockwell Automation
ROK
$48.2B
– –
-6,009
Closed -$1.71M
ROP icon
9955
Roper Technologies
ROP
$40.3B
– –
-1,371
Closed -$593K
RRX icon
9956
Regal Rexnord
RRX
$10.8B
– –
-386
Closed -$55.9K
RSKD icon
9957
Riskified
RSKD
$860M
– –
-83,187
Closed -$462K
RSKD icon
9958
PUT
Riskified
RSKD
$860M
– –
-152,100
Closed -$702K
RSP icon
9959
Invesco S&P 500 Equal Weight ETF
RSP
$100B
– –
-33,923
Closed -$4.79M
RSPR icon
9960
Invesco S&P 500 Equal Weight Real Estate ETF
RSPR
$96.4M
– –
-6
Closed –
RSVR
9961
CALL
Reservoir Media
RSVR
$642M
– –
-400
Closed -$2K
RSVR
9962
PUT
Reservoir Media
RSVR
$642M
– –
-3,000
Closed -$17K
RTH icon
9963
VanEck Retail ETF
RTH
$248M
– –
-39
Closed -$6K
RUSHA icon
9964
Rush Enterprises Class A
RUSHA
$5.95B
– –
-680
Closed -$16.4K
RVPH
9965
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
– –
-515
Closed -$45K
RVTY icon
9966
Revvity
RVTY
$14.5B
– –
-472
Closed -$62.2K
RWAY icon
9967
Runway Growth Finance
RWAY
$279M
– –
-10,160
Closed -$127K
RXD icon
9968
ProShares UltraShort Health Care
RXD
$3.06M
$0 ﹤0.01%
16
-3
-16% -$77
RXI icon
9969
iShares Global Consumer Discretionary ETF
RXI
$255M
– –
-161
Closed -$20K
RXO icon
9970
PUT
RXO
RXO
$3.41B
– –
-500
Closed -$8K
RYAN icon
9971
Ryan Specialty Holdings
RYAN
$5.12B
– –
-305
Closed -$12.5K
RYTM icon
9972
Rhythm Pharmaceuticals
RYTM
$7.07B
– –
-5,581
Closed -$140K
SAH icon
9973
CALL
Sonic Automotive
SAH
$2.56B
– –
-21,200
Closed -$1.04M
SAIC icon
9974
CALL
Saic
SAIC
$5.31B
– –
-1,300
Closed -$144K
SAIC icon
9975
Saic
SAIC
$5.31B
– –
-1,503
Closed -$158K
397 398
399
400 401

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Simplex Trading's Q1 2023 Portfolio in Review

As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.

Simplex Trading's Q1 2023 filing shows 1,536 new, 3,663 increased, 3,631 reduced and 1,728 closed positions. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M. The largest sale was Amazon, an estimated $189M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
  • Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
  • Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
  • Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
  • Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
  • Simplex Trading opened 1,536 new positions and closed 1,728 in Q1 2023.
  • Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.

Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.