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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
+3.04%
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
$2.27B
AUM Growth
-$49.2M
Cap. Flow
-$210M
Cap. Flow %
-9.24%
Top 10 Hldgs %
17.82%
Holding
7,591
New
1,643
Increased
2,060
Reduced
2,267
Closed
1,502

Top Buys

Rank Stock Value
1
TSLA icon
Tesla
TSLA
+$33.5M
2
NFLX icon
Netflix
NFLX
+$22.8M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$20.9M
4
TWX
Time Warner Inc
TWX
+$18.3M
5
BABA icon
Alibaba
BABA
+$15.2M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$71.1M
2
MU icon
Micron Technology
MU
+$43.8M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$26.3M
4
BKNG icon
Booking.com
BKNG
+$22.2M
5
BA icon
Boeing
BA
+$21.6M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 7.87%
2 Communication Services 7.14%
3 Technology 6.23%
4 Financials 5.5%
5 Healthcare 5.2%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PSO icon
5326
Pearson
PSO
$9.78B
$2K ﹤0.01%
217
-494
-69% -$4.92K
QLYS icon
5327
PUT
Qualys
QLYS
$4.84B
$2K ﹤0.01%
8
-105
-93% -$7.25K
QUAD icon
5328
PUT
Quad
QUAD
$430M
$2K ﹤0.01%
19
-40
-68% -$974
RHI icon
5329
PUT
Robert Half
RHI
$3.61B
$2K ﹤0.01%
24
-13
-35% -$743
RNAC icon
5330
PUT
Cartesian Therapeutics
RNAC
$232M
– –
0
– –
RRR icon
5331
PUT
Red Rock Resorts
RRR
$3.74B
$2K ﹤0.01%
12
-58
-83% -$1.91K
RS icon
5332
PUT
Reliance Steel & Aluminium
RS
$20.8B
$2K ﹤0.01%
+24
New +$2.14K
RYZ
5333
PUT
Ryerson Holding Corp
RYZ
$1.6B
$2K ﹤0.01%
+96
New +$990
SABR icon
5334
PUT
Sabre
SABR
$656M
$2K ﹤0.01%
+44
New +$942
SAFT icon
5335
PUT
Safety Insurance
SAFT
$1.52B
$2K ﹤0.01%
15
-53
-78% -$4.06K
SANW
5336
CALL
DELISTED
S&W Seed Co
SANW
$2K ﹤0.01%
+1
New +$72
SCM icon
5337
Stellus Capital Investment Corp
SCM
$203M
$2K ﹤0.01%
235
-270
-53% -$3.25K
SEM
5338
PUT
DELISTED
Select Medical
SEM
$2K ﹤0.01%
61
-87
-59% -$828
SF
5339
PUT
Stifel
SF
$12.3B
$2K ﹤0.01%
+14
New +$397
SHYF
5340
PUT
DELISTED
The Shyft Group
SHYF
$2K ﹤0.01%
+22
New +$342
SITC icon
5341
CALL
SITE Centers
SITC
$230M
$2K ﹤0.01%
47
+1
+2% +$10
SLG icon
5342
PUT
SL Green Realty
SLG
$3.88B
$2K ﹤0.01%
8
+2
+33% +$187
SNV
5343
CALL
DELISTED
Synovus
SNV
$2K ﹤0.01%
56
-23
-29% -$1.16K
SSTK icon
5344
PUT
Shutterstock
SSTK
$205M
$2K ﹤0.01%
35
-98
-74% -$4.63K
SYY icon
5345
PUT
Sysco
SYY
$39.7B
$2K ﹤0.01%
56
-297
-84% -$18K
TEF
5346
PUT
DELISTED
Telefonica
TEF
$2K ﹤0.01%
61
-70
-53% -$556
TEL icon
5347
CALL
TE Connectivity
TEL
$58.8B
$2K ﹤0.01%
5
-179
-97% -$18.1K
TG icon
5348
PUT
Tredegar Corp
TG
$268M
$2K ﹤0.01%
22
-5
-19% -$90
TGB
5349
PUT
Trekor Metals
TGB
$2.56B
$2K ﹤0.01%
+28
New +$45
TITN icon
5350
CALL
Titan Machinery
TITN
$466M
$2K ﹤0.01%
6
-12
-67% -$251
212 213
214
215 216

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Simplex Trading's Q1 2018 Portfolio in Review

As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.

Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.

By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.

Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.

  • Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
  • Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
  • Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
  • Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
  • Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
  • Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.

Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.