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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
RJF icon
4576
Raymond James Financial
RJF
$32.5B
$1K ﹤0.01%
51
-6,101
-99% -$228K
RM icon
4577
PUT
Regional Management Corp
RM
$384M
$1K ﹤0.01%
36
+1
+3% +$15
RMD icon
4578
PUT
ResMed
RMD
$28.3B
$1K ﹤0.01%
14
-15
-52% -$974
RRX icon
4579
CALL
Regal Rexnord
RRX
$14.2B
$1K ﹤0.01%
+6
New +$449
RS icon
4580
PUT
Reliance Steel & Aluminium
RS
$20.8B
$1K ﹤0.01%
+6
New +$338
SANW
4581
DELISTED
S&W Seed Co
SANW
$1K ﹤0.01%
18
+1
+6% +$86
SBSW icon
4582
Sibanye-Stillwater
SBSW
$5.92B
$1K ﹤0.01%
+229
New +$2.11K
SBSW icon
4583
PUT
Sibanye-Stillwater
SBSW
$5.92B
$1K ﹤0.01%
+4
New +$37
SCCO icon
4584
CALL
Southern Copper
SCCO
$141B
$1K ﹤0.01%
70
+18
+35% +$480
SCHL icon
4585
Scholastic
SCHL
$796M
$1K ﹤0.01%
+38
New +$1.41K
SEE
4586
PUT
DELISTED
Sealed Air
SEE
$1K ﹤0.01%
19
-43
-69% -$1.91K
SEIC icon
4587
SEI Investments
SEIC
$11.9B
$1K ﹤0.01%
+35
New +$1.47K
SFL icon
4588
CALL
SFL Corp
SFL
$1.59B
$1K ﹤0.01%
6
-118
-95% -$1.75K
SHEN icon
4589
Shenandoah Telecom
SHEN
$632M
$1K ﹤0.01%
70
-1,120
-94% -$17.1K
SKT icon
4590
Tanger
SKT
$4.82B
$1K ﹤0.01%
+32
New +$1.19K
SNA icon
4591
CALL
Snap-on
SNA
$20.9B
$1K ﹤0.01%
+5
New +$703
SNA icon
4592
PUT
Snap-on
SNA
$20.9B
$1K ﹤0.01%
+6
New +$844
SNV
4593
DELISTED
Synovus
SNV
$1K ﹤0.01%
+54
New +$1.47K
SPTN
4594
CALL
DELISTED
SpartanNash
SPTN
$1K ﹤0.01%
+6
New +$162
SRI icon
4595
PUT
Stoneridge
SRI
$209M
$1K ﹤0.01%
+10
New +$120
SSNC icon
4596
CALL
SS&C Technologies
SSNC
$17.8B
$1K ﹤0.01%
+76
New +$2.26K
NSLR
4597
CALL
Neostellar Capital Corp
NSLR
$262M
$1K ﹤0.01%
31
+14
+82% +$88
STLD icon
4598
PUT
Steel Dynamics
STLD
$35.6B
$1K ﹤0.01%
8
-1
-11% -$19
STRL icon
4599
CALL
Sterling Infrastructure
STRL
$20.3B
$1K ﹤0.01%
+5
New +$20
STT icon
4600
CALL
State Street
STT
$50.9B
$1K ﹤0.01%
22
-26
-54% -$1.95K
182 183
184
185 186

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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.