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 | |
|---|---|---|---|---|---|---|
|
CTXS
376
PUT
DELISTED
Citrix Systems Inc
CTXS
| $8.66M | 0.03% |
845
-186
| -18% | -$19.6K |
|
377
PUT
General Dynamics
GD
$101B
| $8.6M | 0.03% |
547
+344
| +169% | +$61.6K |
|
378
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $8.56M | 0.03% |
19,850
+70
| +0.4% | +$820 |
|
379
CALL
American Tower
AMT
$77.4B
| $8.56M | 0.03% |
541
+111
| +26% | +$17.4K |
|
|
CGC
380
CALL
Canopy Growth
CGC
$384M
| $8.56M | 0.03% |
319
+51
| +19% | +$19.2K |
|
381
PUT
HSBC
HSBC
$354B
| $8.53M | 0.03% |
2,152
+1,309
| +155% | +$52.4K |
|
|
GRUB
382
PUT
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $8.53M | 0.03% |
555
+130
| +31% | +$24.4K |
|
383
PUT
Ralph Lauren
RL
$23B
| $8.51M | 0.03% |
823
+651
| +378% | +$76.8K |
|
384
PUT
Valero Energy
VLO
$92.3B
| $8.51M | 0.03% |
1,135
-2,082
| -65% | -$183K |
|
385
VanEck Semiconductor ETF
SMH
$70.7B
| $8.45M | 0.02% |
193,638
+130,318
| +206% | +$6.12M |
|
386
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $8.44M | 0.02% |
1,846
+1,755
| +1,929% | +$35.4K |
|
387
CALL
Rio Tinto
RIO
$150B
| $8.42M | 0.02% |
1,737
+750
| +76% | +$36.6K |
|
388
NVIDIA
NVDA
$5.14T
| $8.38M | 0.02% |
2,511,320
-2,068,280
| -45% | -$9.89M |
|
|
ETFC
389
CALL
DELISTED
E*Trade Financial Corporation
ETFC
| $8.37M | 0.02% |
1,908
-970
| -34% | -$47.5K |
|
390
PUT
Petrobras
PBR
$122B
| $8.37M | 0.02% |
6,435
+740
| +13% | +$10.7K |
|
391
PUT
United States Oil Fund
USO
$2.36B
| $8.36M | 0.02% |
1,082
+868
| +406% | +$87.4K |
|
392
CALL
Norfolk Southern
NSC
$74.3B
| $8.34M | 0.02% |
558
-55
| -9% | -$9.05K |
|
393
PUT
Equinix
EQIX
$101B
| $8.32M | 0.02% |
236
+48
| +26% | +$18.7K |
|
394
Electronic Arts
EA
$52.4B
| $8.29M | 0.02% |
105,132
+67,026
| +176% | +$6.15M |
|
395
PUT
Nutanix
NTNX
$14.4B
| $8.28M | 0.02% |
1,990
-636
| -24% | -$26.3K |
|
396
PUT
Honeywell
HON
$73.8B
| $8.25M | 0.02% |
1,086
+397
| +58% | +$54.2K |
|
397
PUT
Estee Lauder
EL
$29.9B
| $8.23M | 0.02% |
633
+32
| +5% | +$4.35K |
|
398
CALL
Newmont
NEM
$102B
| $8.23M | 0.02% |
2,376
+1,796
| +310% | +$58.2K |
|
399
CALL
AB InBev
BUD
$160B
| $8.12M | 0.02% |
1,234
+135
| +12% | +$10.3K |
|
|
DATA
400
CALL
DELISTED
Tableau Software, Inc.
DATA
| $8.11M | 0.02% |
676
+343
| +103% | +$38.3K |
|
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.