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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
+2.11%
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
$36.6B
AUM Growth
+$674M
Cap. Flow
-$192M
Cap. Flow %
-0.52%
Top 10 Hldgs %
34.99%
Holding
8,406
New
1,261
Increased
2,604
Reduced
3,015
Closed
1,301

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 Technology 0.5%
2 Communication Services 0.5%
3 Healthcare 0.35%
4 Industrials 0.3%
5 Consumer Discretionary 0.26%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ROG icon
7676
CALL
Rogers Corp
ROG
$2.37B
– –
-30
Closed -$476K
ROG icon
7677
PUT
Rogers Corp
ROG
$2.37B
– –
-100
Closed -$1.59M
ROK icon
7678
Rockwell Automation
ROK
$51.1B
– –
-714
Closed -$121K
ROKU icon
7679
Roku
ROKU
$21B
– –
-29,899
Closed -$2.4M
ROM icon
7680
ProShares Ultra Technology
ROM
$1.16B
– –
-1,040
Closed -$14K
RPD icon
7681
Rapid7
RPD
$646M
– –
-1,816
Closed -$95.6K
RPM icon
7682
PUT
RPM International
RPM
$13.1B
– –
-22
Closed -$127K
RRC icon
7683
Range Resources
RRC
$9.14B
– –
-33,633
Closed -$292K
RRGB icon
7684
Red Robin
RRGB
$130M
– –
-1,232
Closed -$37.8K
RRX icon
7685
Regal Rexnord
RRX
$14.3B
– –
-37
Closed -$2.98K
RSG icon
7686
Republic Services
RSG
$66.8B
– –
-4,184
Closed -$348K
HIND
7687
Vyome Holdings
HIND
$14.9M
– –
0
– –
RTH icon
7688
VanEck Retail ETF
RTH
$245M
– –
-1,258
Closed -$131K
RVSB icon
7689
Riverview Bancorp
RVSB
$107M
$0 ﹤0.01%
61
-1,247
-95% -$9.68K
RVSB icon
7690
PUT
Riverview Bancorp
RVSB
$107M
– –
-50
Closed -$36K
RWR icon
7691
State Street SPDR Dow Jones REIT ETF
RWR
$1.89B
– –
-1,295
Closed -$128K
RWT
7692
Redwood Trust
RWT
$611M
– –
-29
Closed -$470
RYN icon
7693
Rayonier
RYN
$6.39B
$0 ﹤0.01%
+17
New +$475
SA
7694
Seabridge Gold
SA
$2.81B
– –
-10,194
Closed -$121K
SABR icon
7695
Sabre
SABR
$676M
– –
-5,209
Closed -$112K
SAH icon
7696
Sonic Automotive
SAH
$3.13B
– –
-846
Closed -$16.3K
SAH icon
7697
PUT
Sonic Automotive
SAH
$3.13B
– –
-9
Closed -$13K
SAIA icon
7698
CALL
Saia
SAIA
$11.3B
– –
-85
Closed -$519K
SB icon
7699
Safe Bulkers
SB
$759M
$0 ﹤0.01%
117
-216
-65% -$336
SB icon
7700
PUT
Safe Bulkers
SB
$759M
– –
-15
Closed -$2K
306 307
308
309 310

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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 1,301 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 Technology at 0.5% of assets, up from 0.42% a quarter earlier, followed by Communication Services and Healthcare.

  • 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 1,301 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.