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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
-$49.6M
Cap. Flow %
-0.04%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,663
Reduced
3,631
Closed
1,728

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 Miscellaneous 98.51%
2 Technology 0.42%
3 Consumer Discretionary 0.2%
4 Healthcare 0.17%
5 Industrials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
GGAL icon
9376
Galicia Financial Group
GGAL
$7.13B
– –
-87,106
Closed -$1.08M
GGG icon
9377
CALL
Graco
GGG
$12.6B
– –
-2,000
Closed -$134K
GGR icon
9378
CALL
Gogoro
GGR
$53.4M
– –
-475
Closed -$30K
GGR icon
9379
Gogoro
GGR
$53.4M
$0 ﹤0.01%
7
-47
-87% -$3.95K
GGR icon
9380
PUT
Gogoro
GGR
$53.4M
– –
-115
Closed -$7K
GHM icon
9381
Graham Corp
GHM
$1.03B
– –
-327
Closed -$3.98K
GHM icon
9382
PUT
Graham Corp
GHM
$1.03B
– –
-500
Closed -$4K
GIFI
9383
DELISTED
Gulf Island Fabrication
GIFI
$0 ﹤0.01%
137
-205
-60% -$910
GIGB icon
9384
Goldman Sachs Access Investment Grade Corporate Bond ETF
GIGB
$1.01B
– –
-175
Closed -$7K
GIII icon
9385
G-III Apparel Group
GIII
$1.17B
– –
-57,387
Closed -$899K
GL icon
9386
Globe Life
GL
$13.4B
– –
-658
Closed -$77.2K
GLDD
9387
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
– –
-300
Closed -$1K
GLDD
9388
PUT
DELISTED
Great Lakes Dredge & Dock
GLDD
– –
-500
Closed -$2K
DMRA
9389
Damora Therapeutics
DMRA
$1.86B
$0 ﹤0.01%
+12
New +$633
CBIO
9390
Crescent Biopharma
CBIO
$776M
– –
-676
Closed -$152K
CBIO
9391
PUT
Crescent Biopharma
CBIO
$776M
– –
-10
Closed -$3K
GMAB icon
9392
Genmab
GMAB
$20.7B
– –
-4,027
Closed -$155K
GM icon
9393
General Motors
GM
$77B
– –
-195,072
Closed -$7.38M
GNPX icon
9394
Genprex
GNPX
$2.87M
– –
0
– –
GNSS icon
9395
Genasys
GNSS
$66M
– –
-397
Closed -$1.42K
GNW icon
9396
Genworth Financial
GNW
$3.91B
– –
-3,045
Closed -$16.9K
GOOG icon
9397
Alphabet (Google) Class C
GOOG
$4.1T
– –
-217,128
Closed -$19.3M
GOSS icon
9398
Gossamer Bio
GOSS
$85.7M
$0 ﹤0.01%
100
-60,245
-100% -$115K
GOSS icon
9399
PUT
Gossamer Bio
GOSS
$85.7M
– –
-94,400
Closed -$204K
GORV
9400
CALL
DELISTED
Lazydays
GORV
– –
-67
Closed -$23K
374 375
376
377 378

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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's Q1 2023 filing shows 1,536 new, 3,663 increased, 3,631 reduced and 1,728 closed positions. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M. The largest sale was Amazon, an estimated $189M.

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 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 1,728 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.