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 | Miscellaneous | 97.48% |
| 2 | Technology | 0.51% |
| 3 | Communication Services | 0.5% |
| 4 | Healthcare | 0.37% |
| 5 | Industrials | 0.31% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
351
PUT
MongoDB
MDB
$29.7B
| $11.8M | 0.03% |
773
-154
| -17% | -$22.4K |
|
352
CALL
Altria Group
MO
$115B
| $11.7M | 0.03% |
2,475
-546
| -18% | -$28.6K |
|
353
PUT
Thermo Fisher Scientific
TMO
$227B
| $11.7M | 0.03% |
398
+121
| +44% | +$33.3K |
|
|
NLSN
354
CALL
DELISTED
Nielsen Holdings plc
NLSN
| $11.7M | 0.03% |
5,161
+1,548
| +43% | +$37.4K |
|
355
PUT
BP
BP
$113B
| $11.6M | 0.03% |
2,839
-36
| -1% | -$1.51K |
|
356
CALL
lululemon athletica
LULU
$11.1B
| $11.6M | 0.03% |
644
-1,313
| -67% | -$228K |
|
357
PUT
TransDigm Group
TDG
$64.2B
| $11.6M | 0.03% |
239
+119
| +99% | +$55.7K |
|
358
CALL
ProShares UltraShort Health Care
RXD
$3.06M
| $11.6M | 0.03% |
1,064
+114
| +12% | +$10.5K |
|
359
PUT
Baxter International
BAX
$13.4B
| $11.5M | 0.03% |
1,410
+1,085
| +334% | +$84.2K |
|
360
CALL
Danaher
DHR
$146B
| $11.5M | 0.03% |
907
+396
| +77% | +$46.9K |
|
|
WCG
361
CALL
DELISTED
Wellcare Health Plans, Inc.
WCG
| $11.5M | 0.03% |
403
+26
| +7% | +$7.17K |
|
362
PUT
Abbott
ABT
$187B
| $11.4M | 0.03% |
1,356
+539
| +66% | +$42.4K |
|
363
PUT
Okta
OKTA
$29.8B
| $11.4M | 0.03% |
923
+396
| +75% | +$43K |
|
364
CALL
CSX Corp
CSX
$91.5B
| $11.3M | 0.03% |
4,392
-444
| -9% | -$11.4K |
|
365
PUT
Truist Financial
TFC
$63.1B
| $11.3M | 0.03% |
2,305
+617
| +37% | +$30.2K |
|
366
PUT
MarketAxess Holdings
MKTX
$5.75B
| $11.3M | 0.03% |
351
+77
| +28% | +$22.3K |
|
367
PUT
Waste Management
WM
$87.5B
| $11.3M | 0.03% |
976
+502
| +106% | +$54.5K |
|
368
RTX Corp
RTX
$271B
| $11.2M | 0.03% |
136,749
+104,904
| +329% | +$8.77M |
|
369
CALL
Norfolk Southern
NSC
$74B
| $11.2M | 0.03% |
561
+306
| +120% | +$60.7K |
|
370
CALL
AB InBev
BUD
$158B
| $11.1M | 0.03% |
1,258
-844
| -40% | -$72.4K |
|
371
PUT
Herbalife
HLF
$1.3B
| $11.1M | 0.03% |
2,604
+765
| +42% | +$36.2K |
|
372
CALL
Capital One
COF
$135B
| $11M | 0.03% |
1,216
+611
| +101% | +$54.6K |
|
373
PUT
Las Vegas Sands
LVS
$28.7B
| $11M | 0.03% |
1,862
-341
| -15% | -$21.1K |
|
374
PUT
Carvana
CVNA
$53.7B
| $11M | 0.03% |
8,750
-3,910
| -31% | -$50.2K |
|
375
CALL
United States Natural Gas Fund
UNG
$572M
| $10.9M | 0.03% |
1,374
-162
| -11% | -$14.1K |
|
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 1,300 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 Miscellaneous at 97% of assets, up from 97% a quarter earlier, followed by Technology and Communication Services.
- 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 1,300 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.