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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
TFSL icon
7776
TFS Financial
TFSL
$5.12B
– –
-94
Closed -$1.6K
TGI
7777
DELISTED
Triumph Group
TGI
– –
-4,917
Closed -$106K
TGS icon
7778
Transportadora de Gas del Sur
TGS
$4.74B
– –
-2
Closed –
TGTX icon
7779
TG Therapeutics
TGTX
$8.06B
– –
-26,146
Closed -$198K
THO icon
7780
Thor Industries
THO
$4.04B
– –
-2,012
Closed -$122K
THS
7781
DELISTED
Treehouse Foods
THS
– –
-24,908
Closed -$1.45M
TISI icon
7782
Team
TISI
$76.3M
– –
-490
Closed -$79K
TK icon
7783
Teekay
TK
$968M
$0 ﹤0.01%
+246
New +$947
TLYS icon
7784
Tilly's
TLYS
$116M
– –
-1,570
Closed -$17K
TLYS icon
7785
PUT
Tilly's
TLYS
$116M
– –
-86
Closed -$95K
TMHC icon
7786
CALL
Taylor Morrison
TMHC
$6.67B
– –
-86
Closed -$152K
TMO icon
7787
Thermo Fisher Scientific
TMO
$196B
– –
-880
Closed -$242K
TMQ
7788
CALL
Trilogy Metals
TMQ
$549M
– –
-53
Closed -$13K
TMV icon
7789
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$179M
– –
-10,594
Closed -$424K
TNDM icon
7790
Tandem Diabetes Care
TNDM
$1.16B
– –
-80
Closed -$5.16K
TNK icon
7791
Teekay Tankers
TNK
$2.59B
– –
-8,888
Closed -$81K
TNK icon
7792
PUT
Teekay Tankers
TNK
$2.59B
– –
-87
Closed -$67K
TOUR
7793
CALL
Tuniu
TOUR
$57.6M
– –
0
– -$1K
TOWN icon
7794
Towne Bank
TOWN
$3.29B
– –
-510
Closed -$13.5K
TPH
7795
DELISTED
Tri Pointe Homes
TPH
– –
-337
Closed -$4.39K
TPVG icon
7796
CALL
TriplePoint Venture Growth BDC
TPVG
$186M
– –
-6
Closed -$8K
TQQQ icon
7797
ProShares UltraPro QQQ
TQQQ
$34.1B
– –
-21,536
Closed -$152K
TRAK icon
7798
CALL
ReposiTrak
TRAK
$146M
– –
-25
Closed -$19K
TRAK icon
7799
ReposiTrak
TRAK
$146M
$0 ﹤0.01%
151
-335
-69% -$2.23K
TREE icon
7800
LendingTree
TREE
$578M
– –
-867
Closed -$332K
310 311
312
313 314

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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.