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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
+6.28%
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
$91.9B
AUM Growth
+$3.47B
Cap. Flow
+$1.91B
Cap. Flow %
2.08%
Top 10 Hldgs %
34.1%
Holding
11,206
New
1,219
Increased
3,365
Reduced
4,370
Closed
1,942

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$170M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$71.3M
3
T icon
AT&T
T
+$44.2M
4
META icon
Meta Platforms (Facebook)
META
+$37.1M
5
EEM icon
iShares MSCI Emerging Markets ETF
EEM
+$34.4M

Top Sells

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$94.3M
2
JPM icon
JPMorgan Chase
JPM
+$68.2M
3
C icon
Citigroup
C
+$62.8M
4
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$50.9M
5
GLD icon
SPDR Gold Trust
GLD
+$46.3M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 0.38%
2 Technology 0.35%
3 Communication Services 0.24%
4 Healthcare 0.2%
5 Consumer Staples 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SRTS icon
10351
Sensus Healthcare
SRTS
$48.4M
– –
-49,775
Closed -$449K
SRTS icon
10352
PUT
Sensus Healthcare
SRTS
$48.4M
– –
-4,700
Closed -$58K
SSB icon
10353
CALL
SouthState Bank Corp
SSB
$9.89B
– –
-11,000
Closed -$870K
SSB icon
10354
SouthState Bank Corp
SSB
$9.89B
– –
-1,578
Closed -$124K
SSB icon
10355
PUT
SouthState Bank Corp
SSB
$9.89B
– –
-13,400
Closed -$1.06M
SSP icon
10356
PUT
E.W. Scripps
SSP
$269M
– –
-700
Closed -$7K
SSTK icon
10357
Shutterstock
SSTK
$211M
$0 ﹤0.01%
18
-19,976
-100% -$1.02M
STC icon
10358
CALL
Stewart Information Services
STC
$1.95B
– –
-100
Closed -$4K
STC icon
10359
Stewart Information Services
STC
$1.95B
– –
-11
Closed –
STC icon
10360
PUT
Stewart Information Services
STC
$1.95B
– –
-300
Closed -$13K
STE icon
10361
CALL
Steris
STE
$20.5B
– –
-100
Closed -$16K
STEP icon
10362
CALL
StepStone Group
STEP
$3.32B
– –
-100
Closed -$2K
STGW icon
10363
CALL
Stagwell
STGW
$1.75B
– –
-4,600
Closed -$31K
STGW icon
10364
Stagwell
STGW
$1.75B
– –
-7,818
Closed -$54K
STKH
10365
CALL
Steakholder Foods
STKH
$820K
– –
-2
Closed -$1K
STN icon
10366
PUT
Stantec
STN
$7.61B
– –
-1,400
Closed -$61K
STNG icon
10367
Scorpio Tankers
STNG
$3.95B
– –
-21,705
Closed -$1.08M
STRA icon
10368
CALL
Strategic Education
STRA
$1.7B
– –
-1,400
Closed -$85K
STRO icon
10369
Sutro Biopharma
STRO
$391M
– –
-49
Closed -$2K
STTK icon
10370
Shattuck Labs
STTK
$674M
– –
-5,249
Closed -$14K
STVN icon
10371
CALL
Stevanato
STVN
$5.29B
– –
-500
Closed -$8K
STX icon
10372
Seagate
STX
$207B
– –
-63,482
Closed -$3.37M
STXS icon
10373
Stereotaxis
STXS
$140M
$0 ﹤0.01%
100
-25
-20% -$49
STZ icon
10374
Constellation Brands
STZ
$22.1B
– –
-3,821
Closed -$915K
SUI icon
10375
Sun Communities
SUI
$14.8B
– –
-2,006
Closed -$274K
413 414
415
416 417

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Simplex Trading's Q4 2022 Portfolio in Review

As of Q4 2022, Simplex Trading held 11,206 positions worth $91.9B, up 3.9% from $88.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.

Simplex Trading's Q4 2022 filing shows 1,219 new, 3,365 increased, 4,370 reduced and 1,942 closed positions. Its largest new stake was iShares MSCI Emerging Markets ETF: 932,756 shares worth $35.4M. The largest sale was Microsoft, an estimated $94.3M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 0.38% of assets, up from 0.3% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q4 2022 buy was iShares MSCI Emerging Markets ETF: 932,756 shares worth $35.4M.
  • Simplex Trading added most to Amazon in Q4 2022, an estimated $170M increase.
  • Simplex Trading's biggest Q4 2022 reduction was Microsoft, cutting an estimated $94.3M.
  • Simplex Trading fully exited JPMorgan Chase in Q4 2022, selling an estimated $68.2M.
  • Simplex Trading's ten largest holdings make up 34% of its $91.9B portfolio in Q4 2022.
  • Simplex Trading opened 1,219 new positions and closed 1,942 in Q4 2022.
  • Simplex Trading's portfolio value rose 3.9% quarter-over-quarter to $91.9B.

Based on Simplex Trading's 13F filing for Q4 2022, filed 2 Feb 2023.