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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
PRLB icon
7626
Protolabs
PRLB
$1.87B
– –
-462
Closed -$49.7K
PRQR icon
7627
ProQR Therapeutics
PRQR
$254M
– –
-52
Closed –
PRQR icon
7628
PUT
ProQR Therapeutics
PRQR
$254M
– –
-20
Closed -$27K
PRTA icon
7629
CALL
Prothena Corp
PRTA
$448M
– –
-2
Closed -$2K
PSA icon
7630
Public Storage
PSA
$55.2B
– –
-3,821
Closed -$876K
PSCH icon
7631
Invesco S&P SmallCap Health Care ETF
PSCH
$162M
– –
-450
Closed -$17K
PSEC icon
7632
CALL
Prospect Capital
PSEC
$1.06B
– –
-50
Closed -$32K
PSMT icon
7633
CALL
Pricesmart
PSMT
$5.79B
– –
-32
Closed -$188K
PSO icon
7634
PUT
Pearson
PSO
$9.61B
– –
-81
Closed -$88K
PSP icon
7635
Invesco Global Listed Private Equity ETF
PSP
$224M
– –
-110
Closed -$6K
P
7636
Everpure Inc
P
$24.8B
– –
-38,851
Closed -$759K
BCIC
7637
BCP Investment Corp
BCIC
$86.6M
– –
-26
Closed -$731
PUK icon
7638
CALL
Prudential
PUK
$36.2B
– –
-1
Closed -$4K
PVL
7639
Permianville Royalty Trust
PVL
$57.1M
– –
-8,856
Closed -$27K
PWR icon
7640
Quanta Services
PWR
$97.5B
– –
-40,084
Closed -$1.52M
PXLW icon
7641
CALL
Pixelworks
PXLW
$39.2M
– –
-5
Closed -$21K
HTT
7642
High Templar Tech Ltd
HTT
$385M
– –
-53,388
Closed -$368K
QDEL icon
7643
CALL
QuidelOrtho
QDEL
$1.13B
– –
-7
Closed -$45K
QLD icon
7644
ProShares Ultra QQQ
QLD
$12.7B
– –
-47,656
Closed -$535K
QMCO icon
7645
CALL
Quantum Corp
QMCO
$454M
– –
-1
Closed -$1K
QMCO icon
7646
PUT
Quantum Corp
QMCO
$454M
– –
-2
Closed -$6K
QNST icon
7647
QuinStreet
QNST
$859M
– –
-3,269
Closed -$48.8K
QQQ icon
7648
Invesco QQQ Trust
QQQ
$458B
– –
-667,812
Closed -$123M
QUAD icon
7649
Quad
QUAD
$427M
– –
-2,318
Closed -$24.3K
R icon
7650
Ryder
R
$10.4B
– –
-4,276
Closed -$254K
304 305
306
307 308

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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.