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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
RJET
7551
PUT
Republic Airways Holdings
RJET
$810M
– –
0
– -$2K
MFA
7552
CALL
MFA Financial
MFA
$934M
– –
-1
Closed -$3K
MFC icon
7553
Manulife Financial
MFC
$72.5B
– –
-15,153
Closed -$246K
MG icon
7554
Mistras Group
MG
$497M
– –
-1,391
Closed -$20K
MG icon
7555
PUT
Mistras Group
MG
$497M
– –
-17
Closed -$24K
MGIC
7556
CALL
DELISTED
Magic Software Enterprises
MGIC
– –
-55
Closed -$41K
MGIC
7557
DELISTED
Magic Software Enterprises
MGIC
– –
-131
Closed –
MGPI icon
7558
MGP Ingredients
MGPI
$382M
– –
-878
Closed -$64.1K
MIDD icon
7559
Middleby
MIDD
$6.07B
– –
-1,562
Closed -$188K
MJ icon
7560
Amplify Alternative Harvest ETF
MJ
$100M
– –
-522
Closed -$156K
MLI icon
7561
Mueller Industries
MLI
$14.1B
– –
-1,476
Closed -$10.9K
MLI icon
7562
PUT
Mueller Industries
MLI
$14.1B
– –
-28
Closed -$16K
MLKN icon
7563
MillerKnoll
MLKN
$1.51B
– –
-586
Closed -$20.4K
MLPA icon
7564
Global X MLP ETF
MLPA
$2.28B
– –
-34
Closed -$1K
MRSH
7565
Marsh
MRSH
$85B
– –
-5,870
Closed -$519K
MMSI icon
7566
Merit Medical Systems
MMSI
$4.41B
– –
-181
Closed -$10.3K
MNRO icon
7567
PUT
Monro
MNRO
$529M
– –
-14
Closed -$96K
MO icon
7568
Altria Group
MO
$122B
– –
-61,059
Closed -$3.12M
MOV icon
7569
Movado Group
MOV
$817M
– –
-663
Closed -$22.2K
MPAA icon
7570
Motorcar Parts of America
MPAA
$262M
– –
-2,477
Closed -$41K
MPAA icon
7571
PUT
Motorcar Parts of America
MPAA
$262M
– –
-40
Closed -$66K
MPX
7572
PUT
DELISTED
Marine Products Corp
MPX
– –
-10
Closed -$16K
MRC
7573
DELISTED
MRC Global
MRC
– –
-1,474
Closed -$24K
MRTN icon
7574
Marten Transport
MRTN
$1.35B
– –
-714
Closed -$7K
MRTN icon
7575
PUT
Marten Transport
MRTN
$1.35B
– –
-53
Closed -$56K
301 302
303
304 305

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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.