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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
-2.07%
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
$35.2B
AUM Growth
-$1.49B
Cap. Flow
-$310M
Cap. Flow %
-0.88%
Top 10 Hldgs %
32.67%
Holding
8,410
New
1,312
Increased
3,129
Reduced
2,596
Closed
1,163

Top Buys

Rank Stock Value
1
BABA icon
Alibaba
BABA
+$50.3M
2
BA icon
Boeing
BA
+$24.3M
3
GLD icon
SPDR Gold Trust
GLD
+$18.3M
4
BIIB icon
Biogen
BIIB
+$15.9M
5
FDX icon
FedEx
FDX
+$15.1M

Top Sells

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$60.3M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$36.4M
3
NFLX icon
Netflix
NFLX
+$19M
4
XLI icon
State Street Industrial Select Sector SPDR ETF
XLI
+$17.3M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$14.2M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 0.49%
2 Technology 0.48%
3 Healthcare 0.35%
4 Industrials 0.35%
5 Communication Services 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
RIOT icon
7776
Riot Platforms
RIOT
$9.26B
– –
-100,716
Closed -$210K
RJF icon
7777
Raymond James Financial
RJF
$32.2B
– –
-1,359
Closed -$73.8K
RLGT icon
7778
CALL
Radiant Logistics
RLGT
$418M
– –
-8
Closed -$4K
RNAC icon
7779
CALL
Cartesian Therapeutics
RNAC
$230M
– –
-1
Closed -$5K
ROG icon
7780
Rogers Corp
ROG
$2.41B
– –
-5,770
Closed -$851K
ROL icon
7781
Rollins
ROL
$19B
– –
-209
Closed -$4.8K
ROP icon
7782
Roper Technologies
ROP
$36.6B
– –
-1,037
Closed -$377K
RPM icon
7783
RPM International
RPM
$13.2B
– –
-477
Closed -$31.6K
RS icon
7784
CALL
Reliance Steel & Aluminium
RS
$21.1B
– –
-78
Closed -$738K
HIND
7785
Vyome Holdings
HIND
$14.7M
– –
0
– –
RUSHA icon
7786
Rush Enterprises Class A
RUSHA
$5.93B
– –
-21,357
Closed -$355K
RVLV icon
7787
Revolve Group
RVLV
$1.74B
– –
-1,114
Closed -$31.8K
RVSB icon
7788
Riverview Bancorp
RVSB
$107M
– –
-61
Closed –
RVTY icon
7789
Revvity
RVTY
$12.6B
– –
-782
Closed -$68.4K
RVTY icon
7790
PUT
Revvity
RVTY
$12.6B
– –
-49
Closed -$472K
RYN icon
7791
Rayonier
RYN
$6.42B
$0 ﹤0.01%
12
-5
-29% -$128
RYN icon
7792
PUT
Rayonier
RYN
$6.42B
– –
-1
Closed -$3K
SANM icon
7793
Sanmina
SANM
$11.7B
– –
-219
Closed -$6.72K
SANM icon
7794
PUT
Sanmina
SANM
$11.7B
– –
-1
Closed -$3K
SANW
7795
DELISTED
S&W Seed Co
SANW
$0 ﹤0.01%
+2
New +$100
ECHO
7796
EchoStar
ECHO
$26.5B
– –
-1,225
Closed -$44.3K
ECHO
7797
PUT
EchoStar
ECHO
$26.5B
– –
-33
Closed -$119K
SB icon
7798
Safe Bulkers
SB
$751M
– –
-117
Closed -$228
SBUX icon
7799
Starbucks
SBUX
$117B
– –
-5,680
Closed -$527K
SCCO icon
7800
Southern Copper
SCCO
$146B
– –
-1,301
Closed -$41.3K
310 311
312
313 314

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Simplex Trading's Q3 2019 Portfolio in Review

As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.

Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
  • Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
  • Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
  • Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
  • Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
  • Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
  • Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.

Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.