Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$29.6M |
| 2 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$22.6M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$17.9M |
| 4 |
Netflix
NFLX
|
+$17.1M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$13.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 2 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$40.6M |
| 3 |
Walt Disney
DIS
|
+$25.6M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.5M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
3751
PUT
H&R Block
HRB
$5.98B
| $152K | ﹤0.01% |
52
-412
| -89% | -$11.1K |
|
3752
PUT
Lands' End
LE
$378M
| $152K | ﹤0.01% |
125
+84
| +205% | +$1.27K |
|
|
BIG
3753
DELISTED
Big Lots, Inc.
BIG
| $152K | ﹤0.01% |
+5,329
| New | +$178K |
|
3754
PUT
AMN Healthcare
AMN
$1.35B
| $151K | ﹤0.01% |
28
-292
| -91% | -$14.8K |
|
3755
PUT
Brunswick
BC
$5.23B
| $151K | ﹤0.01% |
33
-1
| -3% | -$48 |
|
3756
Daktronics
DAKT
$946M
| $151K | ﹤0.01% |
24,585
-5,911
| -19% | -$41.2K |
|
|
GDEN
3757
CALL
DELISTED
Golden Entertainment
GDEN
| $151K | ﹤0.01% |
108
+89
| +468% | +$1.29K |
|
|
3758
CALL
Lands' End
LE
$378M
| $151K | ﹤0.01% |
124
-119
| -49% | -$1.8K |
|
3759
PUT
Dentsply Sirona
XRAY
$2.84B
| $151K | ﹤0.01% |
26
-33
| -56% | -$1.77K |
|
|
RAD
3760
DELISTED
Rite Aid Corporation
RAD
| $151K | ﹤0.01% |
18,964
+1,459
| +8% | +$12.6K |
|
|
HCR
3761
CALL
DELISTED
Hi-Crush Inc. Common Stock
HCR
| $151K | ﹤0.01% |
617
+85
| +16% | +$266 |
|
3762
CALL
Antero Resources
AR
$10.9B
| $150K | ﹤0.01% |
272
+100
| +58% | +$721 |
|
3763
PUT
Brookfield Infrastructure Partners
BIP
$19.6B
| $150K | ﹤0.01% |
59
+29
| +97% | +$723 |
|
3764
Badger Meter
BMI
$3.87B
| $150K | ﹤0.01% |
2,518
+1,352
| +116% | +$74.9K |
|
3765
PUT
GDS Holdings
GDS
$5.93B
| $150K | ﹤0.01% |
40
-358
| -90% | -$13K |
|
3766
Helios Technologies
HLIO
$2.47B
| $150K | ﹤0.01% |
+3,241
| New | +$151K |
|
3767
CALL
Talphera
TLPH
$68M
| $150K | ﹤0.01% |
30
+20
| +200% | +$1.2K |
|
3768
Tronox
TROX
$967M
| $150K | ﹤0.01% |
11,804
+5,974
| +102% | +$73.2K |
|
3769
CALL
WillScot Mobile Mini Holdings
WSC
$4.37B
| $150K | ﹤0.01% |
+100
| New | +$1.36K |
|
|
AMRS
3770
CALL
DELISTED
Amyris Inc.
AMRS
| $150K | ﹤0.01% |
424
+8
| +2% | +$32 |
|
|
HOME
3771
CALL
DELISTED
At Home Group Inc.
HOME
| $150K | ﹤0.01% |
226
-10
| -4% | -$177 |
|
3772
PUT
Amdocs
DOX
$6.03B
| $149K | ﹤0.01% |
24
-18
| -43% | -$1.04K |
|
3773
CALL
Fabrinet
FN
$14.9B
| $149K | ﹤0.01% |
30
-33
| -52% | -$1.74K |
|
3774
QuidelOrtho
QDEL
$1.13B
| $149K | ﹤0.01% |
2,528
+2,480
| +5,167% | +$149K |
|
3775
CALL
Westlake Chemical Partners
WLKP
$772M
| $149K | ﹤0.01% |
61
+24
| +65% | +$554 |
|
Similar funds
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.