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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
PLUG icon
4551
CALL
Plug Power
PLUG
$2.92B
$1K ﹤0.01%
67
+16
+31% +$46
PLUG icon
4552
PUT
Plug Power
PLUG
$2.92B
$1K ﹤0.01%
10
-8
-44% -$23
PLX icon
4553
CALL
Protalix BioTherapeutics
PLX
$191M
$1K ﹤0.01%
+12
New +$235
PLXS icon
4554
CALL
Plexus
PLXS
$6.81B
$1K ﹤0.01%
+15
New +$601
PMT
4555
CALL
PennyMac Mortgage Investment
PMT
$849M
$1K ﹤0.01%
8
-8
-50% -$173
PNR icon
4556
PUT
Pentair
PNR
$10.2B
$1K ﹤0.01%
+4
New +$174
PNW icon
4557
CALL
Pinnacle West Capital
PNW
$12.9B
$1K ﹤0.01%
25
+13
+108% +$868
POOL icon
4558
CALL
Pool Corp
POOL
$6.7B
$1K ﹤0.01%
+10
New +$668
PPG icon
4559
CALL
PPG Industries
PPG
$25.9B
$1K ﹤0.01%
6
-426
-99% -$48.8K
PRA
4560
PUT
DELISTED
ProAssurance
PRA
$1K ﹤0.01%
+3
New +$136
PRGS icon
4561
Progress Software
PRGS
$1.55B
$1K ﹤0.01%
+65
New +$1.72K
PRI icon
4562
Primerica
PRI
$9.81B
$1K ﹤0.01%
+21
New +$1.09K
PRIM icon
4563
PUT
Primoris Services
PRIM
$4.69B
$1K ﹤0.01%
+10
New +$195
PSEC icon
4564
Prospect Capital
PSEC
$1.06B
$1K ﹤0.01%
+144
New +$1.23K
PXLW icon
4565
PUT
Pixelworks
PXLW
$38.8M
$1K ﹤0.01%
1
-2
-67% -$122
PZG icon
4566
Paramount Gold Nevada
PZG
$94.4M
$1K ﹤0.01%
+1,800
New +$2.12K
PZZA icon
4567
PUT
Papa John's
PZZA
$999M
$1K ﹤0.01%
+13
New +$810
QTWO icon
4568
CALL
Q2 Holdings
QTWO
$3.42B
$1K ﹤0.01%
+41
New +$808
RAIL icon
4569
PUT
FreightCar America
RAIL
$275M
$1K ﹤0.01%
+3
New +$83
RAMP icon
4570
CALL
LiveRamp
RAMP
$2.29B
$1K ﹤0.01%
+25
New +$480
RBBN icon
4571
CALL
Ribbon Communications
RBBN
$354M
$1K ﹤0.01%
44
+36
+450% +$593
RCI icon
4572
CALL
Rogers Communications
RCI
$17.7B
$1K ﹤0.01%
+25
New +$901
RDI icon
4573
Reading International Class A
RDI
$32.9M
$1K ﹤0.01%
+100
New +$1.27K
RDY icon
4574
CALL
Dr. Reddy's Laboratories
RDY
$9.82B
$1K ﹤0.01%
+5
New +$53
RES icon
4575
RPC Inc
RES
$1.24B
$1K ﹤0.01%
+147
New +$1.84K
181 182
183
184 185

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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.