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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
351
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
| $12.4M | 0.04% |
353
+78
| +28% | +$27.3K |
|
352
CALL
RTX Corp
RTX
$282B
| $12.3M | 0.04% |
1,435
-213
| -13% | -$17.7K |
|
353
CALL
Etsy
ETSY
$7.68B
| $12.3M | 0.04% |
2,175
+1,790
| +465% | +$105K |
|
354
CALL
General Mills
GIS
$19B
| $12.3M | 0.03% |
2,224
+826
| +59% | +$44.5K |
|
355
CALL
American Express
AXP
$233B
| $12.2M | 0.03% |
1,034
-159
| -13% | -$19.5K |
|
356
CALL
Zoom
ZM
$24.7B
| $12.2M | 0.03% |
1,602
+1,026
| +178% | +$92.4K |
|
357
CALL
Expedia Group
EXPE
$30.9B
| $12.2M | 0.03% |
908
-75
| -8% | -$9.91K |
|
358
PUT
Dollar General
DG
$25.4B
| $12.2M | 0.03% |
767
+317
| +70% | +$45.9K |
|
359
CALL
Estee Lauder
EL
$28.9B
| $12.2M | 0.03% |
612
+181
| +42% | +$34.6K |
|
360
PUT
Verizon
VZ
$183B
| $12.2M | 0.03% |
2,016
-2,897
| -59% | -$167K |
|
361
CALL
PNC Financial Services
PNC
$99.5B
| $12.2M | 0.03% |
867
+519
| +149% | +$70.4K |
|
362
PUT
Las Vegas Sands
LVS
$30.5B
| $12.1M | 0.03% |
2,103
+241
| +13% | +$14K |
|
|
DISH
363
PUT
DELISTED
DISH Network Corp.
DISH
| $12.1M | 0.03% |
3,558
+1,130
| +47% | +$40.5K |
|
364
CALL
GE Aerospace
GE
$362B
| $12.1M | 0.03% |
2,710
+997
| +58% | +$46.9K |
|
|
365
PUT
RTX Corp
RTX
$282B
| $12.1M | 0.03% |
1,403
-671
| -32% | -$55.7K |
|
366
CALL
Illinois Tool Works
ITW
$79.7B
| $12M | 0.03% |
769
+190
| +33% | +$28.8K |
|
367
PUT
SLB Ltd
SLB
$70.6B
| $11.9M | 0.03% |
3,491
-442
| -11% | -$16.2K |
|
368
PUT
Analog Devices
ADI
$185B
| $11.7M | 0.03% |
1,047
-247
| -19% | -$28K |
|
369
PUT
Boston Beer
SAM
$1.82B
| $11.7M | 0.03% |
321
+287
| +844% | +$113K |
|
|
370
Alphabet (Google) Class C
GOOG
$3.88T
| $11.7M | 0.03% |
191,720
-1,018,620
| -84% | -$60.3M |
|
371
CALL
Elevance Health
ELV
$82.3B
| $11.6M | 0.03% |
485
+345
| +246% | +$94.5K |
|
372
CALL
EOG Resources
EOG
$77.5B
| $11.6M | 0.03% |
1,566
+578
| +59% | +$46.8K |
|
373
CALL
Yum! Brands
YUM
$40.6B
| $11.6M | 0.03% |
1,021
+423
| +71% | +$48.3K |
|
374
CALL
MetLife
MET
$59.5B
| $11.6M | 0.03% |
2,451
+1,394
| +132% | +$66.5K |
|
375
PUT
BP
BP
$113B
| $11.5M | 0.03% |
3,036
+197
| +7% | +$7.52K |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.