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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
426
CALL
Eaton
ETN
$158B
| $7.46M | 0.02% |
1,086
+281
| +35% | +$21K |
|
427
CALL
United States Natural Gas Fund
UNG
$472M
| $7.41M | 0.02% |
750
+161
| +27% | +$19.5K |
|
428
PUT
BP
BP
$112B
| $7.33M | 0.02% |
1,995
+1,074
| +117% | +$42.9K |
|
429
PUT
Arista Networks
ANET
$220B
| $7.33M | 0.02% |
5,568
+192
| +4% | +$2.76K |
|
430
CALL
NextEra Energy
NEE
$186B
| $7.32M | 0.02% |
1,684
-464
| -22% | -$20.3K |
|
431
CALL
Lumen
LUMN
$6.9B
| $7.31M | 0.02% |
4,823
+3,133
| +185% | +$59.8K |
|
432
PUT
PNC Financial Services
PNC
$101B
| $7.29M | 0.02% |
624
+451
| +261% | +$57.6K |
|
433
CALL
Campbell Soup
CPB
$6.52B
| $7.29M | 0.02% |
2,210
-688
| -24% | -$26K |
|
434
CALL
Dollar Tree
DLTR
$23.5B
| $7.25M | 0.02% |
803
-37
| -4% | -$3.13K |
|
435
PUT
Lam Research
LRCX
$399B
| $7.2M | 0.02% |
5,290
-16,800
| -76% | -$241K |
|
436
CALL
Sarepta Therapeutics
SRPT
$1.67B
| $7.19M | 0.02% |
659
+62
| +10% | +$7.75K |
|
437
CALL
Tyler Technologies
TYL
$11.7B
| $7.17M | 0.02% |
386
+354
| +1,106% | +$69.9K |
|
438
CALL
Cummins
CMI
$91.2B
| $7.15M | 0.02% |
535
-350
| -40% | -$49.4K |
|
439
PUT
MarketAxess Holdings
MKTX
$4.01B
| $7.14M | 0.02% |
338
-10
| -3% | -$2.07K |
|
440
PUT
BHP
BHP
$215B
| $7.14M | 0.02% |
1,657
+1,338
| +419% | +$56.1K |
|
|
X
441
PUT
DELISTED
US Steel
X
| $7.13M | 0.02% |
3,909
-51
| -1% | -$1.28K |
|
442
PUT
CSX Corp
CSX
$92.8B
| $7.13M | 0.02% |
3,441
-1,875
| -35% | -$43.1K |
|
443
Invesco CurrencyShares Euro Currency Trust
FXE
$332M
| $7.11M | 0.02% |
64,911
+31,038
| +92% | +$3.39M |
|
444
CALL
ProShares Ultra S&P500
SSO
$8.02B
| $7.09M | 0.02% |
8,160
+192
| +2% | +$2.61K |
|
445
CALL
Roku
ROKU
$21.2B
| $7.08M | 0.02% |
2,310
-393
| -15% | -$18.5K |
|
446
PUT
Colgate-Palmolive
CL
$73.3B
| $7.07M | 0.02% |
1,187
+247
| +26% | +$15.5K |
|
447
CALL
Air Products & Chemicals
APD
$66.1B
| $7.04M | 0.02% |
440
+370
| +529% | +$58.6K |
|
448
CALL
Becton Dickinson
BDX
$42.2B
| $7.03M | 0.02% |
320
+212
| +196% | +$49.2K |
|
449
CALL
Advance Auto Parts
AAP
$3.35B
| $7.02M | 0.02% |
446
+265
| +146% | +$44.3K |
|
|
ABMD
450
CALL
DELISTED
Abiomed Inc
ABMD
| $7.02M | 0.02% |
216
+3
| +1% | +$1.04K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.