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 |
Amazon
AMZN
|
+$148M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$67.3M |
| 3 |
Meta Platforms (Facebook)
META
|
+$63.2M |
| 4 |
Goldman Sachs
GS
|
+$23.9M |
| 5 |
Citigroup
C
|
+$23.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Berkshire Hathaway Class B
BRK.B
|
+$47.5M |
| 2 |
Apple
AAPL
|
+$46M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$44.5M |
| 4 |
Micron Technology
MU
|
+$29.1M |
| 5 |
Adobe
ADBE
|
+$22.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 1.13% |
| 2 | Communication Services | 0.89% |
| 3 | Technology | 0.68% |
| 4 | Industrials | 0.51% |
| 5 | Healthcare | 0.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
576
PUT
Thor Industries
THO
$4.04B
| $5.45M | 0.02% |
651
+456
| +234% | +$43.6K |
|
577
Illumina
ILMN
$28.9B
| $5.43M | 0.02% |
15,221
+8,287
| +120% | +$2.66M |
|
578
PUT
Dropbox
DBX
$6.69B
| $5.42M | 0.02% |
2,021
-555
| -22% | -$16K |
|
579
PUT
Sarepta Therapeutics
SRPT
$1.67B
| $5.41M | 0.02% |
335
-420
| -56% | -$57.4K |
|
580
CALL
Vail Resorts
MTN
$5.16B
| $5.41M | 0.02% |
197
+61
| +45% | +$17.6K |
|
581
CALL
Alnylam Pharmaceuticals
ALNY
$35.6B
| $5.39M | 0.02% |
616
+405
| +192% | +$40.7K |
|
|
PX
582
PUT
DELISTED
Praxair Inc
PX
| $5.37M | 0.02% |
334
+57
| +21% | +$9.15K |
|
|
DOCU
583
CALL
DocuSign
DOCU
$9.14B
| $5.35M | 0.02% |
1,018
+448
| +79% | +$25.4K |
|
584
CALL
International Flavors & Fragrances
IFF
$19.7B
| $5.33M | 0.02% |
383
+259
| +209% | +$34.1K |
|
585
PUT
Bunge Global
BG
$24B
| $5.3M | 0.02% |
772
+233
| +43% | +$15.4K |
|
586
PUT
Kroger
KR
$35.3B
| $5.3M | 0.02% |
1,821
+353
| +24% | +$10.5K |
|
587
PUT
Rio Tinto
RIO
$150B
| $5.29M | 0.02% |
1,038
+372
| +56% | +$19K |
|
588
CALL
Southern Company
SO
$108B
| $5.27M | 0.02% |
1,209
+637
| +111% | +$29.4K |
|
589
CALL
Moody's
MCO
$85.5B
| $5.27M | 0.02% |
315
+278
| +751% | +$48.9K |
|
590
CALL
Madison Square Garden
MSGS
$9.56B
| $5.26M | 0.02% |
234
+87
| +59% | +$19.3K |
|
591
CALL
Domino's
DPZ
$10.6B
| $5.25M | 0.02% |
178
+21
| +13% | +$5.95K |
|
|
STMP
592
PUT
DELISTED
Stamps.com, Inc.
STMP
| $5.25M | 0.02% |
232
+81
| +54% | +$20.3K |
|
593
PUT
Novartis
NVS
$292B
| $5.24M | 0.02% |
679
+543
| +399% | +$40.1K |
|
594
PUT
Abbott
ABT
$175B
| $5.24M | 0.02% |
714
+453
| +174% | +$29.7K |
|
595
CALL
Veeva Systems
VEEV
$30B
| $5.24M | 0.02% |
481
+25
| +5% | +$2.27K |
|
596
Morgan Stanley
MS
$343B
| $5.23M | 0.02% |
112,287
-183,702
| -62% | -$8.97M |
|
597
CALL
Martin Marietta Materials
MLM
$33.1B
| $5.22M | 0.02% |
287
+213
| +288% | +$44K |
|
598
Norfolk Southern
NSC
$74.3B
| $5.21M | 0.02% |
28,874
+24,399
| +545% | +$4.17M |
|
599
PUT
Workday
WDAY
$32.7B
| $5.21M | 0.02% |
357
+75
| +27% | +$10.4K |
|
600
CALL
Public Storage
PSA
$54.7B
| $5.2M | 0.02% |
258
+46
| +22% | +$9.93K |
|
Similar funds
Simplex Trading's Q3 2018 Portfolio in Review
As of Q3 2018, Simplex Trading held 8,699 positions worth $31.1B, up 22% from $25.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.
Simplex Trading's Q3 2018 filing shows 1,336 new, 3,066 increased, 2,755 reduced and 1,315 closed positions. Its largest new stake was Invesco QQQ Trust: 371,806 shares worth $69.1M. The largest sale was Berkshire Hathaway Class B, an estimated $47.5M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 1.1% of assets, up from 0.92% a quarter earlier, followed by Communication Services and Technology.
- Simplex Trading's largest Q3 2018 buy was Invesco QQQ Trust: 371,806 shares worth $69.1M.
- Simplex Trading added most to Amazon in Q3 2018, an estimated $148M increase.
- Simplex Trading's biggest Q3 2018 reduction was Apple, cutting an estimated $46M.
- Simplex Trading fully exited Berkshire Hathaway Class B in Q3 2018, selling an estimated $47.5M.
- Simplex Trading's ten largest holdings make up 34% of its $31.1B portfolio in Q3 2018.
- Simplex Trading opened 1,336 new positions and closed 1,315 in Q3 2018.
- Simplex Trading's portfolio value rose 22% quarter-over-quarter to $31.1B.
Based on Simplex Trading's 13F filing for Q3 2018, filed 23 Oct 2018.