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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
INCY icon
3351
PUT
Incyte
INCY
$23.7B
$6K ﹤0.01%
54
-219
-80% -$18.1K
KALU icon
3352
Kaiser Aluminum
KALU
$2.65B
$6K ﹤0.01%
85
+27
+47% +$1.98K
OPLN
3353
CALL
Openlane
OPLN
$4.25B
$6K ﹤0.01%
+50
New +$677
LECO icon
3354
CALL
Lincoln Electric
LECO
$14.1B
$6K ﹤0.01%
26
+16
+160% +$1.08K
LNW
3355
CALL
DELISTED
Light & Wonder
LNW
$6K ﹤0.01%
27
-137
-84% -$1.73K
LSAK icon
3356
Lesaka Technologies
LSAK
$392M
$6K ﹤0.01%
+467
New +$6.07K
MAA icon
3357
PUT
Mid-America Apartment Communities
MAA
$15.5B
$6K ﹤0.01%
40
-52
-57% -$3.99K
MAG
3358
DELISTED
MAG Silver
MAG
$6K ﹤0.01%
+992
New +$7.2K
MCHP icon
3359
CALL
Microchip Technology
MCHP
$42.3B
$6K ﹤0.01%
72
-56
-44% -$1.35K
MDGL icon
3360
PUT
Madrigal Pharmaceuticals
MDGL
$12.7B
– –
0
– –
MDXG icon
3361
MiMedx Group
MDXG
$635M
$6K ﹤0.01%
+641
New +$6K
MERC icon
3362
CALL
Mercer International
MERC
$44.7M
$6K ﹤0.01%
96
+69
+256% +$929
MFC icon
3363
PUT
Manulife Financial
MFC
$73.2B
$6K ﹤0.01%
21
-82
-80% -$1.41K
MRVL icon
3364
PUT
Marvell Technology
MRVL
$170B
$6K ﹤0.01%
39
-22
-36% -$348
NNI icon
3365
PUT
Nelnet
NNI
$4.81B
$6K ﹤0.01%
+30
New +$1.38K
NOAH
3366
CALL
Noah Holdings
NOAH
$595M
$6K ﹤0.01%
+29
New +$608
NRT
3367
North European Oil Royalty Trust
NRT
$79.2M
$6K ﹤0.01%
+566
New +$7.48K
OLED icon
3368
PUT
Universal Display
OLED
$3.81B
$6K ﹤0.01%
46
-70
-60% -$2.48K
OTEX icon
3369
PUT
Open Text
OTEX
$5.73B
$6K ﹤0.01%
36
-28
-44% -$800
PCG icon
3370
CALL
PG&E
PCG
$47.2B
$6K ﹤0.01%
217
+183
+538% +$10.1K
PEGA icon
3371
PUT
Pegasystems
PEGA
$4.7B
$6K ﹤0.01%
+78
New +$806
PKX icon
3372
PUT
POSCO
PKX
$16.1B
$6K ﹤0.01%
7
-1
-13% -$61
BCIC
3373
BCP Investment Corp
BCIC
$88.1M
$6K ﹤0.01%
90
– –
QSR icon
3374
CALL
Restaurant Brands International
QSR
$25.8B
$6K ﹤0.01%
+25
New +$996
RYN icon
3375
PUT
Rayonier
RYN
$6.52B
$6K ﹤0.01%
9
-9
-50% -$229
133 134
135
136 137

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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.