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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
STLD icon
9626
Steel Dynamics
STLD
$34.7B
– –
-40,720
Closed -$5.16M
STNG icon
9627
Scorpio Tankers
STNG
$4.12B
– –
-33,446
Closed -$1.5M
STNE icon
9628
StoneCo
STNE
$2.33B
– –
-250,724
Closed -$2.36M
STRO icon
9629
Sutro Biopharma
STRO
$333M
– –
-135
Closed -$2.13K
STXF
9630
Strive 500 ETF
STXF
$1.18B
– –
-100
Closed -$3K
STTK icon
9631
Shattuck Labs
STTK
$681M
– –
-251
Closed -$309
STT icon
9632
State Street
STT
$53.4B
– –
-10,835
Closed -$1.04M
STVN icon
9633
PUT
Stevanato
STVN
$5.6B
– –
-1,800
Closed -$39K
STX icon
9634
Seagate
STX
$192B
– –
-35,339
Closed -$3.34M
STZ icon
9635
Constellation Brands
STZ
$21.9B
– –
-20,544
Closed -$3.73M
SUN icon
9636
Sunoco
SUN
$14.2B
– –
-17,247
Closed -$976K
SUPN icon
9637
PUT
Supernus Pharmaceuticals
SUPN
$2.53B
– –
-500
Closed -$18K
SUZ icon
9638
CALL
Suzano
SUZ
$11.3B
– –
-1,900
Closed -$19K
SVAL icon
9639
iShares US Small Cap Value Factor ETF
SVAL
$162M
– –
-90
Closed -$2K
SVXY icon
9640
ProShares Short VIX Short-Term Futures ETF
SVXY
$258M
– –
-45,228
Closed -$2.26M
SWAN icon
9641
Amplify BlackSwan Growth & Treasure Core ETF
SWAN
$157M
– –
-160
Closed -$4K
SWIM icon
9642
Latham Group
SWIM
$835M
– –
-1,858
Closed -$12.5K
SWBI icon
9643
Smith & Wesson
SWBI
$578M
– –
-12,890
Closed -$133K
SY
9644
So-Young International
SY
$278M
$0 ﹤0.01%
171
– –
SYBT icon
9645
CALL
Stock Yards Bancorp
SYBT
$2.47B
– –
-1,500
Closed -$107K
SYRE icon
9646
Spyre Therapeutics
SYRE
$7.85B
– –
-55
Closed -$1.14K
TALO icon
9647
Talos Energy
TALO
$2.81B
– –
-179,337
Closed -$1.7M
TAN icon
9648
Invesco Solar ETF
TAN
$1.03B
– –
-2,318
Closed -$76K
TAP icon
9649
Molson Coors Class B
TAP
$7.55B
– –
-12,179
Closed -$701K
TARS icon
9650
PUT
Tarsus Pharmaceuticals
TARS
$3.98B
– –
-300
Closed -$16K
384 385
386
387 388

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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.