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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$7.93B
Cap. Flow %
-5.08%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Consumer Discretionary 0.22%
3 Healthcare 0.17%
4 Communication Services 0.15%
5 Financials 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
JBBB icon
9051
Janus Henderson B-BBB CLO ETF
JBBB
$1.4B
– –
-77
Closed -$3K
JBL icon
9052
Jabil
JBL
$33.7B
– –
-32,646
Closed -$5.02M
JKHY icon
9053
Jack Henry & Associates
JKHY
$10.5B
– –
-442
Closed -$77.1K
JNJ icon
9054
Johnson & Johnson
JNJ
$624B
– –
-118,269
Closed -$18.5M
JNUG icon
9055
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
$349M
– –
-10,457
Closed -$381K
JPST icon
9056
JPMorgan Ultra-Short Income ETF
JPST
$40B
– –
-329
Closed -$16K
JRVR icon
9057
CALL
James River Group Holdings
JRVR
$209M
– –
-47,700
Closed -$232K
JSML icon
9058
PUT
Janus Henderson Small Cap Growth Alpha ETF
JSML
$371M
– –
-300
Closed -$14K
JSPR icon
9059
PUT
Jasper Therapeutics
JSPR
$24.3M
– –
-100
Closed -$2K
KALV
9060
DELISTED
KalVista Pharmaceuticals
KALV
– –
-35,125
Closed -$358K
KALV
9061
PUT
DELISTED
KalVista Pharmaceuticals
KALV
– –
-126,800
Closed -$1.07M
KB icon
9062
CALL
KB Financial Group
KB
$42.4B
– –
-19,500
Closed -$1.11M
KBH icon
9063
KB Home
KBH
$3.41B
– –
-40,393
Closed -$2.57M
KBR icon
9064
KBR
KBR
$4.61B
– –
-30,958
Closed -$1.65M
KDP icon
9065
Keurig Dr Pepper
KDP
$40.4B
– –
-49,884
Closed -$1.62M
KEP icon
9066
Korea Electric Power
KEP
$15.5B
– –
-3,681
Closed -$27.2K
KEP icon
9067
PUT
Korea Electric Power
KEP
$15.5B
– –
-5,500
Closed -$37K
KEY icon
9068
KeyCorp
KEY
$24.4B
– –
-31,918
Closed -$541K
KFRC icon
9069
CALL
Kforce
KFRC
$1.01B
– –
-100
Closed -$5K
KFRC icon
9070
Kforce
KFRC
$1.01B
– –
-77
Closed -$4K
KWY
9071
Kingsway Corp
KWY
$246M
– –
-43
Closed –
KGS icon
9072
PUT
Kodiak Gas Services
KGS
$6.59B
– –
-4,100
Closed -$167K
KHC icon
9073
Kraft Heinz
KHC
$30.1B
– –
-1,386
Closed -$41.5K
KIE icon
9074
State Street SPDR S&P Insurance ETF
KIE
$606M
– –
-8,138
Closed -$459K
KIM icon
9075
Kimco Realty
KIM
$17.4B
– –
-9,635
Closed -$210K
361 362
363
364 365

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.