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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
+5.12%
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
$1.5B
AUM Growth
+$242M
Cap. Flow
+$178M
Cap. Flow %
11.93%
Top 10 Hldgs %
18.61%
Holding
7,153
New
1,586
Increased
2,321
Reduced
1,709
Closed
1,363

Top Buys

Rank Stock Value
1
LNKD
LinkedIn Corporation
LNKD
+$21.4M
2
GLD icon
SPDR Gold Trust
GLD
+$17.3M
3
QIHU
QIHOO 360 TECHNOLOGY CO LTD ADS RPSTG 3 CL A SHS
QIHU
+$15M
4
BIIB icon
Biogen
BIIB
+$14.9M
5
V icon
Visa
V
+$14.1M

Top Sells

Rank Stock Value
1
AVGO icon
Broadcom
AVGO
+$36.7M
2
GOOG icon
Alphabet (Google) Class C
GOOG
+$20.1M
3
EEM icon
iShares MSCI Emerging Markets ETF
EEM
+$15.8M
4
C icon
Citigroup
C
+$14.7M
5
MDY icon
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
+$13.1M

Sector Composition

Rank Sector Weight
1 Communication Services 6.61%
2 Healthcare 6.55%
3 Technology 6.45%
4 Consumer Discretionary 4.54%
5 Financials 4.51%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
M icon
6176
Macy's
M
$6.15B
– –
-59,366
Closed -$2.13M
MAN icon
6177
ManpowerGroup
MAN
$2.39B
– –
-342
Closed -$26.5K
MANU icon
6178
Manchester United
MANU
$3.91B
– –
-93
Closed -$1.5K
MARA icon
6179
Marathon Digital Holdings
MARA
$4.62B
– –
-36
Closed -$1K
MAS icon
6180
Masco
MAS
$16B
$0 ﹤0.01%
+29
New +$915
MASI
6181
CALL
DELISTED
Masimo
MASI
– –
-20
Closed -$6K
MATV icon
6182
Mativ Holdings
MATV
$448M
– –
-305
Closed -$10.3K
MATW icon
6183
CALL
Matthews International
MATW
$864M
– –
-5
Closed -$1K
MCO icon
6184
CALL
Moody's
MCO
$81.7B
– –
-13
Closed -$3K
MDGL icon
6185
Madrigal Pharmaceuticals
MDGL
$12.6B
– –
-11
Closed –
MDU icon
6186
MDU Resources
MDU
$4.44B
– –
-6,748
Closed -$55K
MDXG icon
6187
CALL
MiMedx Group
MDXG
$626M
– –
-35
Closed -$1K
MDY icon
6188
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
– –
-49,052
Closed -$13.1M
MEI icon
6189
Methode Electronics
MEI
$543M
– –
-105
Closed -$3.08K
MEI icon
6190
PUT
Methode Electronics
MEI
$543M
– –
-10
Closed -$1K
MFIN icon
6191
CALL
Medallion Financial
MFIN
$226M
– –
-7
Closed -$2K
MFIN icon
6192
Medallion Financial
MFIN
$226M
$0 ﹤0.01%
88
-5,443
-98% -$42.3K
MGNI icon
6193
CALL
Magnite
MGNI
$2.65B
– –
-137
Closed -$36K
MGRC icon
6194
CALL
McGrath RentCorp
MGRC
$2.94B
– –
-3
Closed -$1K
MHK icon
6195
CALL
Mohawk Industries
MHK
$6.9B
– –
-21
Closed -$15K
MKC icon
6196
PUT
McCormick & Company Non-Voting
MKC
$13.4B
– –
-156
Closed -$1K
MKL icon
6197
PUT
Markel Group
MKL
$25B
– –
-3
Closed -$7K
MMI icon
6198
Marcus & Millichap
MMI
$1.15B
– –
-1,257
Closed -$31K
MMI icon
6199
PUT
Marcus & Millichap
MMI
$1.15B
– –
-50
Closed -$2K
MMS icon
6200
CALL
Maximus
MMS
$3.14B
– –
-34
Closed -$1K
246 247
248
249 250

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Simplex Trading's Q2 2016 Portfolio in Review

As of Q2 2016, Simplex Trading held 7,153 positions worth $1.5B, up 19% from $1.25B the previous quarter. Its ten largest holdings account for 19% of the portfolio.

Simplex Trading deployed $178M of net new capital in Q2 2016, opening 1,586 new positions and adding to 2,321 existing holdings. Its largest new stake was Biogen: 56,467 shares worth $13.7M.

By sector, the portfolio is most concentrated in Communication Services at 6.6% of assets, down from 6.9% a quarter earlier, followed by Healthcare and Technology.

On the sell side, the largest reduction was Broadcom, an estimated $36.7M trimmed.

  • Simplex Trading's largest Q2 2016 buy was Biogen: 56,467 shares worth $13.7M.
  • Simplex Trading added most to LinkedIn Corporation in Q2 2016, an estimated $21.4M increase.
  • Simplex Trading's biggest Q2 2016 reduction was Broadcom, cutting an estimated $36.7M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q2 2016, selling an estimated $20.1M.
  • Simplex Trading's ten largest holdings make up 19% of its $1.5B portfolio in Q2 2016.
  • Simplex Trading opened 1,586 new positions and closed 1,363 in Q2 2016.
  • Simplex Trading's portfolio value rose 19% quarter-over-quarter to $1.5B.

Based on Simplex Trading's 13F filing for Q2 2016, filed 18 Jul 2016.