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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
+2.14%
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
$860M
AUM Growth
+$34.4M
Cap. Flow
-$17.8M
Cap. Flow %
-2.07%
Top 10 Hldgs %
14.96%
Holding
6,670
New
1,973
Increased
1,386
Reduced
1,513
Closed
1,643

Top Buys

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$40.1M
2
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$12.5M
3
BABA icon
Alibaba
BABA
+$10.5M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$9.89M
5
INTC icon
Intel
INTC
+$9.83M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$35.7M
2
GILD icon
Gilead Sciences
GILD
+$32.3M
3
AMZN icon
Amazon
AMZN
+$29M
4
BKNG icon
Booking.com
BKNG
+$28.4M
5
BIDU icon
Baidu
BIDU
+$13.3M

Sector Composition

Rank Sector Weight
1 Communication Services 7.76%
2 Consumer Discretionary 7.62%
3 Healthcare 7.24%
4 Technology 6.95%
5 Financials 4.83%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
KIM icon
3851
Kimco Realty
KIM
$17.7B
$3K ﹤0.01%
+144
New +$3.87K
TBHC
3852
DELISTED
The Brand House Collective
TBHC
$3K ﹤0.01%
+132
New +$3.16K
KOPN icon
3853
CALL
Kopin
KOPN
$654M
$3K ﹤0.01%
+29
New +$112
KPTI icon
3854
CALL
Karyopharm Therapeutics
KPTI
$161M
$3K ﹤0.01%
+1
New +$431
LE icon
3855
CALL
Lands' End
LE
$389M
$3K ﹤0.01%
21
-13
-38% -$516
LECO icon
3856
PUT
Lincoln Electric
LECO
$14.6B
$3K ﹤0.01%
+17
New +$1.15K
LTC
3857
PUT
LTC Properties
LTC
$2.14B
$3K ﹤0.01%
+8
New +$362
MAC icon
3858
CALL
Macerich
MAC
$7.52B
$3K ﹤0.01%
+208
New +$18.2K
MAG
3859
PUT
DELISTED
MAG Silver
MAG
$3K ﹤0.01%
+10
New +$73
MATX icon
3860
PUT
Matsons
MATX
$6.15B
$3K ﹤0.01%
+116
New +$4.41K
MCO icon
3861
CALL
Moody's
MCO
$83.9B
$3K ﹤0.01%
5
-23
-82% -$2.22K
MDLZ icon
3862
PUT
Mondelez International
MDLZ
$80.2B
$3K ﹤0.01%
18
-36
-67% -$1.3K
MEOH icon
3863
CALL
Methanex
MEOH
$4.12B
$3K ﹤0.01%
+28
New +$1.4K
MLR icon
3864
CALL
Miller Industries
MLR
$584M
$3K ﹤0.01%
+4
New +$86
MSCI icon
3865
CALL
MSCI
MSCI
$42.1B
$3K ﹤0.01%
+11
New +$614
MTN icon
3866
CALL
Vail Resorts
MTN
$5.6B
$3K ﹤0.01%
+2
New +$181
MTW icon
3867
CALL
Manitowoc
MTW
$527M
$3K ﹤0.01%
21
-107
-84% -$2.01K
MUX icon
3868
McEwen Inc
MUX
$1.03B
$3K ﹤0.01%
+350
New +$3.92K
MUX icon
3869
PUT
McEwen Inc
MUX
$1.03B
$3K ﹤0.01%
+4
New +$45
NBR icon
3870
PUT
Nabors Industries
NBR
$1.12B
$3K ﹤0.01%
+1
New +$610
NDSN icon
3871
Nordson
NDSN
$16.9B
$3K ﹤0.01%
+42
New +$3.18K
NICE icon
3872
CALL
Nice
NICE
$5.94B
$3K ﹤0.01%
+12
New +$661
NMFC icon
3873
New Mountain Finance
NMFC
$668M
$3K ﹤0.01%
267
+54
+25% +$792
NMM icon
3874
CALL
Navios Maritime Partners
NMM
$2.25B
$3K ﹤0.01%
+3
New +$541
NOK icon
3875
Nokia
NOK
$49.9B
$3K ﹤0.01%
509
-4,271
-89% -$33.3K
153 154
155
156 157

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Simplex Trading's Q1 2015 Portfolio in Review

As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.

Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.

By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.

  • Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
  • Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
  • Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
  • Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
  • Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
  • Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
  • Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.

Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.