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 |
CELG
Celgene Corp
CELG
|
+$31.6M |
| 2 |
Citigroup
C
|
+$19.5M |
| 3 |
AGN
Allergan plc
AGN
|
+$18.4M |
| 4 |
Baidu
BIDU
|
+$18M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$14.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$81.3M |
| 2 |
NVIDIA
NVDA
|
+$60.2M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$48.2M |
| 4 |
Apple
AAPL
|
+$48.2M |
| 5 |
Meta Platforms (Facebook)
META
|
+$31.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 11.27% |
| 2 | Technology | 10.64% |
| 3 | Healthcare | 7.06% |
| 4 | Communication Services | 6.92% |
| 5 | Industrials | 5.66% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
626
CALL
AeroVironment
AVAV
$8.09B
| $596K | 0.03% |
493
+410
| +494% | +$20.9K |
|
|
DQ
627
Daqo New Energy
DQ
$838M
| $596K | 0.03% |
50,205
+3,630
| +8% | +$31K |
|
|
STI
628
CALL
DELISTED
SunTrust Banks, Inc.
STI
| $596K | 0.03% |
449
+334
| +290% | +$20.4K |
|
629
Omeros
OMER
$722M
| $594K | 0.03% |
30,575
+3,738
| +14% | +$70.1K |
|
630
CALL
United Airlines
UAL
$36.6B
| $593K | 0.03% |
2,318
+1,126
| +94% | +$70.2K |
|
|
MXIM
631
DELISTED
Maxim Integrated Products
MXIM
| $593K | 0.03% |
11,348
-17,139
| -60% | -$891K |
|
632
Zoetis
ZTS
$31.2B
| $591K | 0.03% |
8,204
-23,962
| -74% | -$1.65M |
|
633
PUT
SM Energy
SM
$8.17B
| $590K | 0.03% |
574
-33
| -5% | -$666 |
|
|
ETFC
634
CALL
DELISTED
E*Trade Financial Corporation
ETFC
| $589K | 0.03% |
1,268
+633
| +100% | +$29.1K |
|
635
CALL
ExxonMobil
XOM
$655B
| $586K | 0.03% |
4,623
-1,095
| -19% | -$90.6K |
|
|
EFOR
636
Everforth Inc
EFOR
$821M
| $584K | 0.03% |
9,092
+8,355
| +1,134% | +$506K |
|
637
CALL
Northrop Grumman
NOC
$76.8B
| $584K | 0.03% |
392
-128
| -25% | -$38.4K |
|
|
DCH
638
Dauch Corp
DCH
$1.32B
| $581K | 0.03% |
34,162
+11,477
| +51% | +$203K |
|
|
GPOR
639
DELISTED
Gulfport Energy Corp.
GPOR
| $579K | 0.02% |
45,383
+19,314
| +74% | +$257K |
|
|
CBI
640
PUT
DELISTED
Chicago Bridge & Iron Nv
CBI
| $579K | 0.02% |
959
-163
| -15% | -$2.66K |
|
641
PUT
Teva Pharmaceuticals
TEVA
$35.6B
| $576K | 0.02% |
2,827
-1,078
| -28% | -$16.2K |
|
|
642
PUT
United Airlines
UAL
$36.6B
| $576K | 0.02% |
4,045
+322
| +9% | +$20.1K |
|
|
KYNB
643
Kyntra Bio
KYNB
$29.2M
| $575K | 0.02% |
486
-1,317
| -73% | -$1.65M |
|
644
Iron Mountain
IRM
$37.4B
| $575K | 0.02% |
+15,252
| New | +$605K |
|
645
CALL
Deere & Co
DE
$164B
| $573K | 0.02% |
665
-630
| -49% | -$88.2K |
|
646
Whirlpool
WHR
$2.33B
| $573K | 0.02% |
+3,399
| New | +$576K |
|
|
MDP
647
DELISTED
Meredith Corporation
MDP
| $573K | 0.02% |
+8,679
| New | +$523K |
|
648
Magna International
MGA
$18B
| $571K | 0.02% |
+10,084
| New | +$554K |
|
649
CALL
Teck Resources
TECK
$29.2B
| $571K | 0.02% |
2,186
+544
| +33% | +$12.4K |
|
|
IXYS
650
DELISTED
IXYS Corp
IXYS
| $570K | 0.02% |
23,817
+23,698
| +19,914% | +$571K |
|
Similar funds
Simplex Trading's Q4 2017 Portfolio in Review
As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.
Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.
Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.
- Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
- Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
- Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
- Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
- Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
- Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.
Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.