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 | |
|---|---|---|---|---|---|---|
701
CALL
Exelixis
EXEL
$13.8B
| $513K | 0.02% |
972
+199
| +26% | +$5.29K |
|
|
MULE
702
DELISTED
MuleSoft, Inc.
MULE
| $513K | 0.02% |
22,086
+11,704
| +113% | +$265K |
|
703
CALL
Charter Communications
CHTR
$15.9B
| $511K | 0.02% |
476
+20
| +4% | +$6.79K |
|
704
CALL
United Parcel Service
UPS
$98.5B
| $509K | 0.02% |
2,411
-1,154
| -32% | -$136K |
|
705
CALL
Kroger
KR
$35.3B
| $508K | 0.02% |
1,239
-2,999
| -71% | -$69.8K |
|
|
ALXN
706
CALL
DELISTED
Alexion Pharmaceuticals
ALXN
| $507K | 0.02% |
733
-224
| -23% | -$27.3K |
|
707
CALL
Corning
GLW
$133B
| $506K | 0.02% |
1,149
+579
| +102% | +$18.2K |
|
708
Reinsurance Group of America
RGA
$15.4B
| $506K | 0.02% |
+3,248
| New | +$492K |
|
|
PF
709
DELISTED
Pinnacle Foods, Inc.
PF
| $506K | 0.02% |
8,516
-13,961
| -62% | -$787K |
|
|
PRMW
710
DELISTED
Primo Water Corporation
PRMW
| $506K | 0.02% |
40,309
+40,027
| +14,194% | +$480K |
|
711
CALL
McDonald's
MCD
$187B
| $504K | 0.02% |
1,221
-166
| -12% | -$27.9K |
|
712
CALL
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $502K | 0.02% |
2,278
-344
| -13% | -$15.6K |
|
|
TYNS
713
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $502K | 0.02% |
1,402
-145
| -9% | -$4.08K |
|
714
CALL
Marathon Petroleum
MPC
$92.2B
| $501K | 0.02% |
942
-1,663
| -64% | -$102K |
|
715
CALL
Coca-Cola
KO
$354B
| $500K | 0.02% |
3,091
+963
| +45% | +$44.3K |
|
716
AutoNation
AN
$6.89B
| $499K | 0.02% |
+9,738
| New | +$494K |
|
717
PUT
Riot Platforms
RIOT
$8.84B
| $498K | 0.02% |
+1,193
| New | +$16.7K |
|
718
Safety Insurance
SAFT
$1.06B
| $498K | 0.02% |
+6,198
| New | +$501K |
|
719
PUT
Salesforce
CRM
$133B
| $497K | 0.02% |
3,801
+390
| +11% | +$39.7K |
|
|
EQM
720
DELISTED
EQM Midstream Partners, LP
EQM
| $497K | 0.02% |
+6,812
| New | +$487K |
|
721
Cognex
CGNX
$10.4B
| $496K | 0.02% |
8,126
-10,472
| -56% | -$667K |
|
|
VRAY
722
DELISTED
ViewRay, Inc.
VRAY
| $491K | 0.02% |
53,070
+51,001
| +2,465% | +$408K |
|
723
Old Dominion Freight Line
ODFL
$48.4B
| $490K | 0.02% |
+11,178
| New | +$449K |
|
724
Bank OZK
OZK
$5.56B
| $488K | 0.02% |
+10,080
| New | +$468K |
|
725
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$6.82B
| $487K | 0.02% |
11,001
-3,931
| -26% | -$165K |
|
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.