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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$536M
Cap. Flow %
-0.34%
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 Miscellaneous 98.56%
2 Technology 0.41%
3 Consumer Discretionary 0.22%
4 Healthcare 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
LGO
9126
Largo
LGO
$73.2M
$0 ﹤0.01%
244
-1,743
-88% -$3.15K
LILAK icon
9127
Liberty Latin America Class C
LILAK
$1.66B
– –
-1,225
Closed -$7.43K
LILAK icon
9128
PUT
Liberty Latin America Class C
LILAK
$1.66B
– –
-1,540
Closed -$8K
LINC icon
9129
CALL
Lincoln Educational Services
LINC
$813M
– –
-100
Closed -$1K
LINC icon
9130
Lincoln Educational Services
LINC
$813M
– –
-496
Closed -$8.07K
LIND icon
9131
Lindblad Expeditions
LIND
$1.7B
– –
-201
Closed -$2.29K
LKFN icon
9132
Lakeland Financial Corp
LKFN
$1.51B
– –
-18
Closed -$1K
LKQ icon
9133
LKQ Corp
LKQ
$6.46B
– –
-2,563
Closed -$102K
LLYVA icon
9134
Liberty Live Group Series A
LLYVA
$8.8B
– –
-24
Closed -$1K
LMAT icon
9135
LeMaitre Vascular
LMAT
$1.84B
– –
-194
Closed -$17K
LMNR icon
9136
CALL
Limoneira
LMNR
$272M
– –
-200
Closed -$4K
LMNR icon
9137
PUT
Limoneira
LMNR
$272M
– –
-400
Closed -$9K
LMT icon
9138
Lockheed Martin
LMT
$121B
– –
-6,346
Closed -$2.92M
LNTH icon
9139
Lantheus
LNTH
$6.59B
– –
-5,229
Closed -$489K
LOB icon
9140
Live Oak Bancshares
LOB
$1.83B
– –
-1,097
Closed -$36.5K
LOGI icon
9141
Logitech
LOGI
$14.6B
– –
-8,632
Closed -$812K
LOOP icon
9142
CALL
Loop Industries
LOOP
$23.1M
– –
-4,900
Closed -$5K
LOOP icon
9143
Loop Industries
LOOP
$23.1M
– –
-3,595
Closed -$4.31K
LOPE icon
9144
PUT
Grand Canyon Education
LOPE
$3.98B
– –
-100
Closed -$16K
LPL icon
9145
CALL
LG Display
LPL
$3.3B
– –
-400
Closed -$1K
CYPH
9146
Cypherpunk Technologies Inc
CYPH
$261M
$0 ﹤0.01%
686
-3,402
-83% -$3.75K
CYPH
9147
PUT
Cypherpunk Technologies Inc
CYPH
$261M
– –
-800
Closed -$2K
LQD icon
9148
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$30.3B
– –
-15,382
Closed -$1.64M
LQDT icon
9149
Liquidity Services
LQDT
$1.32B
$0 ﹤0.01%
23
-1,021
-98% -$33.9K
LRMR icon
9150
Larimar Therapeutics
LRMR
$398M
$0 ﹤0.01%
+264
New +$834
364 365
366
367 368

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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's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.

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 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.