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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
+$10.1B
Cap. Flow %
8.87%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,665
Reduced
3,633
Closed
1,729

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 Technology 0.42%
2 Consumer Discretionary 0.2%
3 Healthcare 0.17%
4 Industrials 0.15%
5 Communication Services 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
STIP icon
10076
iShares 0-5 Year TIPS Bond ETF
STIP
$15.8B
– –
-1,053
Closed -$102K
STKH
10077
Steakholder Foods
STKH
$650K
$0 ﹤0.01%
2
-1
-33% -$360
STKL
10078
DELISTED
SunOpta
STKL
– –
-335
Closed -$2.68K
STKL
10079
PUT
DELISTED
SunOpta
STKL
– –
-19,100
Closed -$161K
STKS icon
10080
CALL
The ONE Group
STKS
$57.8M
– –
-3,000
Closed -$18K
STN icon
10081
Stantec
STN
$7.64B
– –
-3,809
Closed -$182K
STOK icon
10082
Stoke Therapeutics
STOK
$1.83B
– –
-10,658
Closed -$96.2K
STT icon
10083
State Street
STT
$50.7B
– –
-33,384
Closed -$2.81M
SUI icon
10084
PUT
Sun Communities
SUI
$14.8B
– –
-1,600
Closed -$228K
SURG icon
10085
SurgePays
SURG
$6.41M
– –
-24,467
Closed -$132K
SVXY icon
10086
ProShares Short VIX Short-Term Futures ETF
SVXY
$217M
– –
-23,622
Closed -$693K
SWIM icon
10087
Latham Group
SWIM
$656M
– –
-63
Closed -$221
SWBI icon
10088
Smith & Wesson
SWBI
$647M
– –
-29,333
Closed -$314K
SWKS icon
10089
Skyworks Solutions
SWKS
$9B
– –
-42,495
Closed -$4.71M
SWTX
10090
PUT
DELISTED
SpringWorks Therapeutics
SWTX
– –
-1,600
Closed -$41K
SWVL icon
10091
Swvl Holdings
SWVL
$13.8M
– –
-70
Closed –
SXI icon
10092
CALL
Standex International
SXI
$3.72B
– –
-300
Closed -$30K
SXI icon
10093
PUT
Standex International
SXI
$3.72B
– –
-100
Closed -$10K
SY
10094
PUT
So-Young International
SY
$191M
– –
-6,000
Closed -$7K
SYBX
10095
DELISTED
Synlogic
SYBX
– –
-9
Closed –
SYPR icon
10096
Sypris Solutions
SYPR
$43.7M
– –
-4,541
Closed -$8.99K
SYRE icon
10097
Spyre Therapeutics
SYRE
$8.59B
$0 ﹤0.01%
2
– –
TAGS icon
10098
Teucrium Agricultural Fund
TAGS
$19.7M
– –
-410
Closed -$12.6K
TALK icon
10099
CALL
Talkspace
TALK
$874M
– –
-1,800
Closed -$1K
TALK icon
10100
Talkspace
TALK
$874M
$0 ﹤0.01%
461
-21
-4% -$17
402 403
404
405 406

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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 deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.

By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.

  • 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 1,729 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.