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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
+6.87%
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
$2.45B
AUM Growth
+$147M
Cap. Flow
+$26.3M
Cap. Flow %
1.07%
Top 10 Hldgs %
23.61%
Holding
7,357
New
1,313
Increased
2,078
Reduced
2,339
Closed
1,500

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$45.9M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$30.1M
3
TWX
Time Warner Inc
TWX
+$25.8M
4
BKNG icon
Booking.com
BKNG
+$22.5M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$17.7M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$43.6M
2
AMGN icon
Amgen
AMGN
+$33.2M
3
BIDU icon
Baidu
BIDU
+$19.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$17.3M
5
MU icon
Micron Technology
MU
+$17.1M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 14.31%
2 Technology 13.17%
3 Communication Services 11.81%
4 Healthcare 4.06%
5 Financials 3.84%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
M icon
6301
Macy's
M
$6.14B
– –
-150,158
Closed -$3.3M
MAC icon
6302
Macerich
MAC
$7.17B
– –
-10,481
Closed -$588K
MAN icon
6303
ManpowerGroup
MAN
$2.32B
– –
-13,219
Closed -$1.48M
MANH icon
6304
CALL
Manhattan Associates
MANH
$8.72B
– –
-107
Closed -$4K
MANU icon
6305
Manchester United
MANU
$3.85B
– –
-6,411
Closed -$108K
MATX icon
6306
Matsons
MATX
$6.46B
– –
-28
Closed -$781
MCFT icon
6307
CALL
MasterCraft Boat Holdings
MCFT
$576M
– –
-233
Closed -$53K
MCK icon
6308
McKesson
MCK
$96.5B
– –
-2,448
Closed -$382K
MCO icon
6309
Moody's
MCO
$82.5B
– –
-796
Closed -$105K
MCO icon
6310
PUT
Moody's
MCO
$82.5B
– –
-83
Closed -$11K
MCRI icon
6311
CALL
Monarch Casino & Resort
MCRI
$2.14B
– –
-150
Closed -$25K
MCY icon
6312
Mercury Insurance
MCY
$5.84B
– –
-97
Closed -$5.49K
MD icon
6313
CALL
Pediatrix Medical
MD
$2.1B
– –
-45
Closed -$5K
MDU icon
6314
MDU Resources
MDU
$4.42B
– –
-1,304
Closed -$12K
MDXG icon
6315
MiMedx Group
MDXG
$615M
– –
-9,160
Closed -$136K
LITS
6316
CALL
Lite Strategy Inc
LITS
$33.7M
– –
-4
Closed -$1K
MELI icon
6317
Mercado Libre
MELI
$91.2B
– –
-9,276
Closed -$2.46M
MET icon
6318
MetLife
MET
$59.5B
– –
-103,279
Closed -$5.03M
MFC icon
6319
PUT
Manulife Financial
MFC
$71.6B
– –
-114
Closed -$3K
MFIN icon
6320
CALL
Medallion Financial
MFIN
$221M
– –
-117
Closed -$4K
MG icon
6321
Mistras Group
MG
$499M
– –
-940
Closed -$19K
MGNI icon
6322
CALL
Magnite
MGNI
$2.57B
– –
-684
Closed -$2K
MGNX icon
6323
MacroGenics
MGNX
$255M
– –
-7,734
Closed -$134K
MGNX icon
6324
PUT
MacroGenics
MGNX
$255M
– –
-201
Closed -$15K
MGPI icon
6325
CALL
MGP Ingredients
MGPI
$377M
– –
-52
Closed -$9K
251 252
253
254 255

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Simplex Trading's Q3 2017 Portfolio in Review

As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
  • Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
  • Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
  • Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
  • Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
  • Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
  • Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.

Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.