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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
+4.79%
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
$179B
AUM Growth
+$8.24B
Cap. Flow
+$1.08B
Cap. Flow %
0.6%
Top 10 Hldgs %
48.72%
Holding
10,008
New
1,520
Increased
3,222
Reduced
3,616
Closed
1,504

Top Buys

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$552M
2
MSTR icon
Strategy Inc
MSTR
+$85.8M
3
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
+$48.1M
4
INTC icon
Intel
INTC
+$45.4M
5
UBER icon
Uber
UBER
+$43M

Top Sells

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$133M
2
PDD icon
Pinduoduo
PDD
+$82.6M
3
BA icon
Boeing
BA
+$49.8M
4
KWEB icon
KraneShares CSI China Internet ETF
KWEB
+$45.1M
5
MSFT icon
Microsoft
MSFT
+$41M

Sector Composition

Rank Sector Weight
1 Technology 0.68%
2 Consumer Discretionary 0.23%
3 Healthcare 0.19%
4 Financials 0.13%
5 Communication Services 0.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SCM icon
8301
PUT
Stellus Capital Investment Corp
SCM
$203M
$1K ﹤0.01%
+100
New +$1.39K
SCYX icon
8302
CALL
SCYNEXIS
SCYX
$37M
$1K ﹤0.01%
138
-275
-67% -$2.85K
SELF
8303
CALL
Global Self Storage
SELF
$57.7M
$1K ﹤0.01%
+300
New +$1.53K
SEMR
8304
PUT
DELISTED
Semrush
SEMR
$1K ﹤0.01%
100
-2,500
-96% -$33.6K
SGU icon
8305
PUT
Star Group
SGU
$428M
$1K ﹤0.01%
+100
New +$1.18K
SHYF
8306
CALL
DELISTED
The Shyft Group
SHYF
$1K ﹤0.01%
+100
New +$1.29K
SITC icon
8307
PUT
SITE Centers
SITC
$230M
$1K ﹤0.01%
+100
New +$1.61K
SLRN
8308
CALL
DELISTED
ACELYRIN
SLRN
$1K ﹤0.01%
600
-1,600
-73% -$7.75K
SLYG icon
8309
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$5.02B
$1K ﹤0.01%
+16
New +$1.51K
SMP icon
8310
Standard Motor Products
SMP
$861M
$1K ﹤0.01%
+49
New +$1.58K
SSTI icon
8311
CALL
SoundThinking
SSTI
$107M
$1K ﹤0.01%
+100
New +$1.2K
SURG icon
8312
CALL
SurgePays
SURG
$6.05M
$1K ﹤0.01%
800
-6,600
-89% -$11.6K
SWIM icon
8313
CALL
Latham Group
SWIM
$646M
$1K ﹤0.01%
200
-500
-71% -$3.34K
SYRE icon
8314
Spyre Therapeutics
SYRE
$8.87B
$1K ﹤0.01%
+55
New +$1.61K
TGI
8315
PUT
DELISTED
Triumph Group
TGI
$1K ﹤0.01%
100
– –
THRD
8316
DELISTED
Third Harmonic Bio
THRD
$1K ﹤0.01%
+153
New +$1.91K
TIPT icon
8317
Tiptree Inc
TIPT
$668M
$1K ﹤0.01%
+67
New +$1.4K
TKC icon
8318
Turkcell
TKC
$4.84B
$1K ﹤0.01%
187
-95
-34% -$617
TORO icon
8319
CALL
Toro Corp
TORO
$175M
$1K ﹤0.01%
400
-100
-20% -$296
TRIB
8320
Trinity Biotech
TRIB
$5.7M
$1K ﹤0.01%
+48
New +$1.93K
TRVG
8321
CALL
trivago
TRVG
$386M
$1K ﹤0.01%
+700
New +$1.35K
TRVG
8322
PUT
trivago
TRVG
$386M
$1K ﹤0.01%
+500
New +$965
TTGT icon
8323
TechTarget
TTGT
$246M
$1K ﹤0.01%
+96
New +$2.53K
TTGT icon
8324
PUT
TechTarget
TTGT
$246M
$1K ﹤0.01%
100
– –
UFI icon
8325
UNIFI
UFI
$117M
$1K ﹤0.01%
223
-3,730
-94% -$22.8K
331 332
333
334 335

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Simplex Trading's Q4 2024 Portfolio in Review

As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.

Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.

By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.

  • Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
  • Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
  • Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
  • Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
  • Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
  • Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
  • Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.

Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.