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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
RDVT icon
9751
Red Violet
RDVT
$1.22B
– –
-85
Closed -$1K
RDWR icon
9752
CALL
Radware
RDWR
$1.19B
– –
-15,000
Closed -$323K
REAX icon
9753
Real REMAX Group Inc. Common Stock
REAX
$407M
$0 ﹤0.01%
3
-10
-77% -$133
REFR icon
9754
Research Frontiers
REFR
$14.5M
$0 ﹤0.01%
+100
New +$162
RELL icon
9755
Richardson Electronics
RELL
$258M
– –
-309
Closed -$5.34K
RELL icon
9756
PUT
Richardson Electronics
RELL
$258M
– –
-100
Closed -$2K
RELY icon
9757
Remitly
RELY
$5.54B
– –
-26,613
Closed -$484K
RETL icon
9758
Direxion Daily Retail Bull 3X ETF
RETL
$26.6M
$0 ﹤0.01%
+32
New +$207
REVG
9759
PUT
DELISTED
REV Group
REVG
– –
-1,400
Closed -$16K
REW icon
9760
Proshares UltraShort Technology
REW
$3M
$0 ﹤0.01%
+1
New +$101
REXR icon
9761
Rexford Industrial Realty
REXR
$8.2B
– –
-16
Closed -$873
RGA icon
9762
Reinsurance Group of America
RGA
$16.5B
– –
-274
Closed -$39K
RH icon
9763
RH
RH
$2.8B
– –
-8,208
Closed -$2.15M
RIG icon
9764
Transocean
RIG
$6.53B
– –
-397,864
Closed -$2.46M
RLGT icon
9765
Radiant Logistics
RLGT
$395M
– –
-31,458
Closed -$203K
RLGT icon
9766
PUT
Radiant Logistics
RLGT
$395M
– –
-157,200
Closed -$1.03M
RMAX
9767
PUT
DELISTED
RE/MAX Holdings
RMAX
– –
-2,000
Closed -$37K
RMR icon
9768
PUT
The RMR Group
RMR
$334M
– –
-900
Closed -$23K
RMTI icon
9769
Rockwell Medical
RMTI
$32.2M
– –
-933
Closed -$28.7K
RNR icon
9770
PUT
RenaissanceRe
RNR
$13.7B
– –
-100
Closed -$20K
RNST icon
9771
CALL
Renasant Corp
RNST
$3.78B
– –
-400
Closed -$12K
RNW icon
9772
ReNew
RNW
$2.5B
– –
-297,343
Closed -$1.63M
ROBO icon
9773
ROBO Global Robotics & Automation Index ETF
ROBO
$2.05B
– –
-119
Closed -$6K
ROCK icon
9774
Gibraltar Industries
ROCK
$1.4B
– –
-648
Closed -$35K
RPAY icon
9775
CALL
Repay Holdings
RPAY
$322M
– –
-1,600
Closed -$10K
389 390
391
392 393

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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.