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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
KINS icon
9576
Kingstone Companies
KINS
$289M
– –
-3,929
Closed -$5K
KLAC icon
9577
KLA
KLAC
$242B
– –
-164,400
Closed -$6.48M
KMB icon
9578
Kimberly-Clark
KMB
$34.9B
– –
-7,802
Closed -$1.01M
KN icon
9579
Knowles
KN
$3.03B
– –
-213
Closed -$3.72K
KN icon
9580
PUT
Knowles
KN
$3.03B
– –
-1,000
Closed -$16K
KNSL icon
9581
Kinsale Capital Group
KNSL
$8.5B
– –
-188
Closed -$55K
KOMP icon
9582
State Street SPDR S&P Kensho New Economies Composite ETF
KOMP
$2.68B
– –
-1
Closed –
KOF icon
9583
PUT
Coca-Cola Femsa
KOF
$23.5B
– –
-100
Closed -$6K
KOPN icon
9584
Kopin
KOPN
$796M
– –
-4,197
Closed -$5.13K
KORU icon
9585
Direxion Daily MSCI South Korea Bull 3X ETF
KORU
$1.7B
– –
-2
Closed –
KPTI icon
9586
Karyopharm Therapeutics
KPTI
$40.6M
– –
-1,160
Closed -$57.3K
KRC icon
9587
Kilroy Realty
KRC
$4.32B
– –
-440
Closed -$16K
KRMD icon
9588
KORU Medical Systems
KRMD
$150M
– –
-110
Closed -$433
KRNY icon
9589
CALL
Kearny Financial
KRNY
$658M
– –
-21,500
Closed -$218K
KRNY icon
9590
Kearny Financial
KRNY
$658M
– –
-90
Closed –
KROS icon
9591
CALL
Keros Therapeutics
KROS
$224M
– –
-6,600
Closed -$316K
KROS icon
9592
Keros Therapeutics
KROS
$224M
– –
-53
Closed -$2.68K
KROS icon
9593
PUT
Keros Therapeutics
KROS
$224M
– –
-100
Closed -$4K
KSA icon
9594
iShares MSCI Saudi Arabia ETF
KSA
$635M
– –
-33
Closed -$1K
KTB icon
9595
Kontoor Brands
KTB
$4.02B
– –
-54
Closed -$2.56K
KULR icon
9596
KULR Technology Group
KULR
$118M
– –
-629
Closed -$5.85K
KULR icon
9597
PUT
KULR Technology Group
KULR
$118M
– –
-250
Closed -$2K
KW
9598
PUT
DELISTED
Kennedy-Wilson Holdings
KW
– –
-400
Closed -$6K
KXIN icon
9599
Kaixin Holdings
KXIN
$2.05M
– –
0
– –
LASR icon
9600
CALL
nLIGHT
LASR
$2.31B
– –
-2,800
Closed -$28K
382 383
384
385 386

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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.