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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
+2.11%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$36.6B
AUM Growth
+$674M
Cap. Flow
-$102M
Cap. Flow %
-0.28%
Top 10 Hldgs %
34.99%
Holding
8,406
New
1,261
Increased
2,604
Reduced
3,015
Closed
1,300

Top Buys

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$29.6M
2
XLI icon
State Street Industrial Select Sector SPDR ETF
XLI
+$22.6M
3
IWM icon
iShares Russell 2000 ETF
IWM
+$17.9M
4
NFLX icon
Netflix
NFLX
+$17.1M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$13.4M

Top Sells

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$123M
2
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$40.6M
3
DIS icon
Walt Disney
DIS
+$25.6M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$13.5M
5
JNJ icon
Johnson & Johnson
JNJ
+$11.2M

Sector Composition

Rank Sector Weight
1 Miscellaneous 97.48%
2 Technology 0.51%
3 Communication Services 0.5%
4 Healthcare 0.37%
5 Industrials 0.31%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SLAB icon
7726
CALL
Silicon Laboratories
SLAB
$7.36B
– –
-15
Closed -$121K
SLDB icon
7727
Solid Biosciences
SLDB
$1.1B
– –
-4,242
Closed -$463K
SLG icon
7728
CALL
SL Green Realty
SLG
$3.94B
– –
-109
Closed -$953K
SLM icon
7729
SLM Corp
SLM
$5.09B
– –
-656
Closed -$6.5K
SLM icon
7730
PUT
SLM Corp
SLM
$5.09B
– –
-17
Closed -$16K
SLV icon
7731
iShares Silver Trust
SLV
$32.2B
– –
-65,474
Closed -$914K
SLX icon
7732
VanEck Steel ETF
SLX
$174M
– –
-5,053
Closed -$202K
SMFG icon
7733
CALL
Sumitomo Mitsui Financial
SMFG
$173B
– –
-12
Closed -$8K
SMG icon
7734
ScottsMiracle-Gro
SMG
$3.46B
– –
-1,146
Closed -$102K
SMP icon
7735
Standard Motor Products
SMP
$928M
– –
-1,495
Closed -$71.6K
SMPL icon
7736
PUT
Simply Good Foods
SMPL
$1.01B
– –
-1
Closed -$2K
SMSI icon
7737
Smith Micro Software
SMSI
$15.9M
– –
-618
Closed -$75.3K
SNDR icon
7738
Schneider National
SNDR
$6.14B
– –
-4,509
Closed -$87.4K
SNDR icon
7739
PUT
Schneider National
SNDR
$6.14B
– –
-10
Closed -$21K
SOL
7740
CALL
DELISTED
Emeren Group
SOL
– –
-20
Closed -$3K
SON icon
7741
PUT
Sonoco
SON
$5.14B
– –
-20
Closed -$123K
SONO icon
7742
Sonos
SONO
$1.82B
– –
-5,024
Closed -$55.2K
SOXX icon
7743
iShares Semiconductor ETF
SOXX
$42.8B
– –
-36,702
Closed -$2.32M
SPGI icon
7744
S&P Global
SPGI
$131B
– –
-5,891
Closed -$1.29M
SPH icon
7745
Suburban Propane Partners
SPH
$1.17B
– –
-2,409
Closed -$56K
SPYM
7746
State Street SPDR Portfolio S&P 500 ETF
SPYM
$170B
– –
-100
Closed -$3K
SPNS
7747
DELISTED
Sapiens International
SPNS
– –
-243
Closed -$3K
SPRO icon
7748
CALL
Spero Therapeutics
SPRO
$70.5M
– –
-1
Closed -$1K
SPXL icon
7749
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$7.17B
– –
-44,597
Closed -$2.08M
SRI icon
7750
CALL
Stoneridge
SRI
$213M
– –
-1
Closed -$2K
308 309
310
311 312

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Simplex Trading's Q2 2019 Portfolio in Review

As of Q2 2019, Simplex Trading held 8,406 positions worth $36.6B, up 1.9% from $36B the previous quarter. Its ten largest holdings account for 35% of the portfolio.

Simplex Trading's Q2 2019 filing shows 1,261 new, 2,604 increased, 3,015 reduced and 1,300 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M. The largest sale was Invesco QQQ Trust, an estimated $123M.

By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, up from 97% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q2 2019 buy was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M.
  • Simplex Trading added most to NVIDIA in Q2 2019, an estimated $29.6M increase.
  • Simplex Trading's biggest Q2 2019 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $40.6M.
  • Simplex Trading fully exited Invesco QQQ Trust in Q2 2019, selling an estimated $123M.
  • Simplex Trading's ten largest holdings make up 35% of its $36.6B portfolio in Q2 2019.
  • Simplex Trading opened 1,261 new positions and closed 1,300 in Q2 2019.
  • Simplex Trading's portfolio value rose 1.9% quarter-over-quarter to $36.6B.

Based on Simplex Trading's 13F filing for Q2 2019, filed 26 Jul 2019.