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 | |
|---|---|---|---|---|---|---|
326
PUT
Crown Castle
CCI
$32.5B
| $12.9M | 0.04% |
992
-512
| -34% | -$65.8K |
|
|
EXAS
327
PUT
DELISTED
Exact Sciences
EXAS
| $12.9M | 0.04% |
1,092
+567
| +108% | +$57.1K |
|
328
PUT
GE Aerospace
GE
$362B
| $12.9M | 0.04% |
2,458
-2,005
| -45% | -$98.7K |
|
329
PUT
Skyworks Solutions
SWKS
$9.1B
| $12.8M | 0.03% |
1,652
+739
| +81% | +$58.6K |
|
330
PUT
eBay
EBAY
$48.5B
| $12.8M | 0.03% |
3,231
-1,719
| -35% | -$64.6K |
|
331
CALL
Northrop Grumman
NOC
$75.8B
| $12.7M | 0.03% |
394
-29
| -7% | -$8.64K |
|
332
PUT
CME Group
CME
$91.9B
| $12.7M | 0.03% |
653
-317
| -33% | -$58.4K |
|
333
PUT
Marriott International
MAR
$96.1B
| $12.6M | 0.03% |
899
-360
| -29% | -$47.8K |
|
|
ABMD
334
CALL
DELISTED
Abiomed Inc
ABMD
| $12.6M | 0.03% |
484
+188
| +64% | +$49.9K |
|
335
PUT
CSX Corp
CSX
$98.1B
| $12.6M | 0.03% |
4,869
+2,082
| +75% | +$53.6K |
|
336
PUT
General Mills
GIS
$19B
| $12.4M | 0.03% |
2,368
+746
| +46% | +$38.5K |
|
337
CALL
United Rentals
URI
$71.4B
| $12.4M | 0.03% |
937
+157
| +20% | +$19.9K |
|
338
PUT
American Airlines Group
AAL
$8.96B
| $12.4M | 0.03% |
3,805
-2,259
| -37% | -$73K |
|
339
Elevance Health
ELV
$82.3B
| $12.3M | 0.03% |
43,725
+40,197
| +1,139% | +$11M |
|
340
PUT
Centene
CNC
$31.5B
| $12.2M | 0.03% |
2,336
-172
| -7% | -$9.29K |
|
341
PUT
Cummins
CMI
$91.8B
| $12.2M | 0.03% |
711
+259
| +57% | +$42.4K |
|
342
PUT
AutoZone
AZO
$47.7B
| $12.1M | 0.03% |
110
-69
| -39% | -$72.6K |
|
343
PUT
JD.com
JD
$40.6B
| $12.1M | 0.03% |
3,990
-2,145
| -35% | -$61.7K |
|
344
PUT
Royal Caribbean
RCL
$76B
| $12.1M | 0.03% |
997
-90
| -8% | -$11K |
|
345
CALL
Rio Tinto
RIO
$149B
| $12M | 0.03% |
1,925
-797
| -29% | -$47.8K |
|
346
PUT
Accenture
ACN
$84.9B
| $12M | 0.03% |
647
-399
| -38% | -$71.7K |
|
347
PUT
Valero Energy
VLO
$90.6B
| $11.9M | 0.03% |
1,391
+239
| +21% | +$19.7K |
|
|
RAD
348
CALL
DELISTED
Rite Aid Corporation
RAD
| $11.9M | 0.03% |
14,806
+14,451
| +4,071% | +$125K |
|
349
PUT
Mohawk Industries
MHK
$6.71B
| $11.8M | 0.03% |
802
-50
| -6% | -$6.92K |
|
|
CGC
350
CALL
Canopy Growth
CGC
$382M
| $11.8M | 0.03% |
293
-162
| -36% | -$71.3K |
|
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.