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 | |
|---|---|---|---|---|---|---|
2026
CALL
Visteon
VC
$2.77B
| $878K | ﹤0.01% |
150
+31
| +26% | +$1.89K |
|
2027
State Street Materials Select Sector SPDR ETF
XLB
$8.51B
| $877K | ﹤0.01% |
30,000
-43,540
| -59% | -$1.23M |
|
2028
CALL
Atkore
ATKR
$2.59B
| $876K | ﹤0.01% |
339
+336
| +11,200% | +$8.21K |
|
2029
CALL
LKQ Corp
LKQ
$6.58B
| $875K | ﹤0.01% |
329
-149
| -31% | -$4.17K |
|
2030
CALL
Republic Services
RSG
$66.7B
| $875K | ﹤0.01% |
101
+20
| +25% | +$1.67K |
|
2031
PUT
Valmont Industries
VMI
$9.44B
| $874K | ﹤0.01% |
69
-11
| -14% | -$1.37K |
|
|
LEXEA
2032
CALL
DELISTED
Liberty Expedia Holdings, Inc. Class A Common Stock
LEXEA
| $874K | ﹤0.01% |
183
+55
| +43% | +$2.43K |
|
|
FDC
2033
CALL
DELISTED
First Data Corporation
FDC
| $874K | ﹤0.01% |
323
-480
| -60% | -$12.5K |
|
2034
PUT
KeyCorp
KEY
$24.3B
| $869K | ﹤0.01% |
490
-518
| -51% | -$8.76K |
|
2035
CALL
SS&C Technologies
SSNC
$17.8B
| $869K | ﹤0.01% |
151
-198
| -57% | -$11.9K |
|
2036
CALL
Fortinet
FTNT
$112B
| $868K | ﹤0.01% |
565
-1,165
| -67% | -$19.2K |
|
2037
OFG Bancorp
OFG
$2.21B
| $867K | ﹤0.01% |
36,506
+6,149
| +20% | +$122K |
|
|
KYNB
2038
Kyntra Bio
KYNB
$28.5M
| $866K | ﹤0.01% |
+767
| New | +$840K |
|
2039
PUT
Everest Group
EG
$15.2B
| $865K | ﹤0.01% |
35
+12
| +52% | +$2.88K |
|
|
LM
2040
DELISTED
Legg Mason, Inc.
LM
| $863K | ﹤0.01% |
22,569
+1,334
| +6% | +$46.1K |
|
2041
PUT
VanEck Durable High Dividend ETF
DURA
$38.7M
| $860K | ﹤0.01% |
248
-399
| -62% | -$10.9K |
|
2042
PUT
Nutrien
NTR
$32.7B
| $860K | ﹤0.01% |
161
-76
| -32% | -$3.97K |
|
2043
PUT
Scorpio Tankers
STNG
$3.96B
| $859K | ﹤0.01% |
291
+113
| +63% | +$2.86K |
|
|
AIFU
2044
AIFU Inc
AIFU
$201M
| $858K | ﹤0.01% |
+64
| New | +$729K |
|
2045
VanEck Biotech ETF
BBH
$396M
| $857K | ﹤0.01% |
6,645
-360
| -5% | -$44.4K |
|
2046
PUT
BBVA Argentina
BBAR
$3.85B
| $856K | ﹤0.01% |
757
-63
| -8% | -$588 |
|
|
CORR
2047
CALL
DELISTED
CorEnergy Infrastructure Trust, Inc.
CORR
| $856K | ﹤0.01% |
216
+81
| +60% | +$3.16K |
|
|
MXIM
2048
PUT
DELISTED
Maxim Integrated Products
MXIM
| $855K | ﹤0.01% |
143
+125
| +694% | +$7.13K |
|
2049
iShares MSCI China ETF
MCHI
$6.04B
| $854K | ﹤0.01% |
14,375
-541
| -4% | -$32.5K |
|
2050
MarketAxess Holdings
MKTX
$4.15B
| $852K | ﹤0.01% |
2,651
-1,168
| -31% | -$338K |
|
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.