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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
+17.83%
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
$36B
AUM Growth
+$1.89B
Cap. Flow
-$586M
Cap. Flow %
-1.63%
Top 10 Hldgs %
34.84%
Holding
8,479
New
1,472
Increased
3,049
Reduced
2,419
Closed
1,324

Top Buys

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$86.9M
2
DIS icon
Walt Disney
DIS
+$25.5M
3
BIDU icon
Baidu
BIDU
+$12.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$12.3M
5
RHT
Red Hat Inc
RHT
+$11.4M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$60.3M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$33.9M
4
AAPL icon
Apple
AAPL
+$21.1M
5
XLF icon
State Street Financial Select Sector SPDR ETF
XLF
+$18.2M

Sector Composition

Rank Sector Weight
1 Communication Services 0.58%
2 Technology 0.42%
3 Healthcare 0.34%
4 Consumer Discretionary 0.29%
5 Industrials 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ABUS icon
6451
CALL
Arbutus Biopharma
ABUS
$865M
$5K ﹤0.01%
14
-93
-87% -$357
ACM icon
6452
CALL
Aecom
ACM
$9.07B
$5K ﹤0.01%
2
+1
+100% +$30
AIN icon
6453
Albany International
AIN
$2.14B
$5K ﹤0.01%
+75
New +$5.34K
BNBX
6454
CALL
DELISTED
BNB PLUS CORP
BNBX
– –
0
– –
ATNI icon
6455
CALL
ATN International
ATNI
$361M
$5K ﹤0.01%
+1
New +$66
AXS icon
6456
CALL
AXIS Capital
AXS
$8.59B
$5K ﹤0.01%
+1
New +$55
BANC icon
6457
CALL
Banc of California
BANC
$3.28B
$5K ﹤0.01%
4
-10
-71% -$149
BJ icon
6458
BJs Wholesale Club
BJ
$11.9B
$5K ﹤0.01%
+215
New +$5.48K
CHRS icon
6459
PUT
Coherus Oncology
CHRS
$217M
$5K ﹤0.01%
4
-43
-91% -$574
CRAI icon
6460
PUT
CRA International
CRAI
$1.1B
$5K ﹤0.01%
+1
New +$45
CSR
6461
PUT
Centerspace
CSR
$936M
$5K ﹤0.01%
+1
New +$58
CYTK icon
6462
CALL
Cytokinetics
CYTK
$11B
$5K ﹤0.01%
7
-23
-77% -$169
EWQ icon
6463
iShares MSCI France ETF
EWQ
$324M
$5K ﹤0.01%
190
-892
-82% -$25.3K
FN icon
6464
PUT
Fabrinet
FN
$17.1B
$5K ﹤0.01%
1
-6
-86% -$327
FPI
6465
CALL
Farmland Partners
FPI
$419M
$5K ﹤0.01%
8
+5
+167% +$28
FTAI icon
6466
PUT
FTAI Aviation
FTAI
$22.2B
$5K ﹤0.01%
4
-24
-86% -$321
FXP icon
6467
ProShares UltraShort FTSE China 50 of ProShares Trust
FXP
$6.3M
$5K ﹤0.01%
+43
New +$5.5K
GLP icon
6468
Global Partners
GLP
$1.64B
$5K ﹤0.01%
+276
New +$5.1K
GOGL
6469
PUT
DELISTED
Golden Ocean Group
GOGL
$5K ﹤0.01%
11
-17
-61% -$93
HIW icon
6470
Highwoods Properties
HIW
$3.71B
$5K ﹤0.01%
+114
New +$5.09K
IBP icon
6471
Installed Building Products
IBP
$6.13B
$5K ﹤0.01%
110
-184
-63% -$7.88K
IEV icon
6472
iShares Europe ETF
IEV
$1.63B
$5K ﹤0.01%
128
– –
ILF icon
6473
iShares Latin America 40 ETF
ILF
$3.77B
$5K ﹤0.01%
+175
New +$5.97K
INVE icon
6474
CALL
Identive
INVE
$64.6M
$5K ﹤0.01%
10
-35
-78% -$182
LOB icon
6475
PUT
Live Oak Bancshares
LOB
$1.95B
$5K ﹤0.01%
4
-4
-50% -$61
257 258
259
260 261

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Simplex Trading's Q1 2019 Portfolio in Review

As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.

Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.

By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
  • Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
  • Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
  • Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
  • Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
  • Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
  • Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.

Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.