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 | |
|---|---|---|---|---|---|---|
851
Toronto Dominion Bank
TD
$197B
| $392K | 0.02% |
+6,705
| New | +$383K |
|
852
Brown-Forman Class B
BF.B
$11.8B
| $390K | 0.02% |
8,883
-200
| -2% | -$7.63K |
|
853
CALL
Gilead Sciences
GILD
$162B
| $389K | 0.02% |
6,085
-2,131
| -26% | -$162K |
|
854
CALL
ArcelorMittal
MT
$49.9B
| $389K | 0.02% |
699
-878
| -56% | -$26K |
|
855
CALL
Electronic Arts
EA
$52.4B
| $388K | 0.02% |
2,220
+1,168
| +111% | +$130K |
|
856
PUT
Signet Jewelers
SIG
$3.48B
| $388K | 0.02% |
1,171
-75
| -6% | -$4.58K |
|
|
SKX
857
DELISTED
Skechers
SKX
| $388K | 0.02% |
10,279
-8,369
| -45% | -$271K |
|
|
CS
858
DELISTED
Credit Suisse Group
CS
| $388K | 0.02% |
+21,750
| New | +$360K |
|
|
NPTN
859
DELISTED
NEOPHOTONICS CORP
NPTN
| $384K | 0.02% |
58,416
+50,282
| +618% | +$307K |
|
860
Rayonier
RYN
$6.41B
| $383K | 0.02% |
+13,361
| New | +$371K |
|
|
ARNA
861
CALL
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $380K | 0.02% |
472
-226
| -32% | -$6.44K |
|
|
SCMP
862
DELISTED
Sucampo Pharmaceuticals, Inc.
SCMP
| $380K | 0.02% |
+21,200
| New | +$261K |
|
863
CALL
Stanley Black & Decker
SWK
$13.6B
| $379K | 0.02% |
231
+155
| +204% | +$25.4K |
|
864
PUT
McKesson
MCK
$96.5B
| $376K | 0.02% |
1,099
+526
| +92% | +$77.9K |
|
|
JBTM
865
JBT Marel
JBTM
$6.99B
| $376K | 0.02% |
3,394
+2,539
| +297% | +$277K |
|
866
Nordson
NDSN
$16.3B
| $375K | 0.02% |
+2,564
| New | +$330K |
|
867
CALL
Truist Financial
TFC
$62.5B
| $375K | 0.02% |
827
-242
| -23% | -$11.7K |
|
|
SIVB
868
DELISTED
SVB Financial Group
SIVB
| $374K | 0.02% |
+1,603
| New | +$342K |
|
869
Abercrombie & Fitch
ANF
$4.04B
| $372K | 0.02% |
+21,361
| New | +$324K |
|
870
AngloGold Ashanti
AU
$39.7B
| $372K | 0.02% |
36,536
-40,250
| -52% | -$388K |
|
871
AB InBev
BUD
$155B
| $372K | 0.02% |
+3,340
| New | +$393K |
|
872
PUT
American Airlines Group
AAL
$8.96B
| $371K | 0.02% |
3,521
+416
| +13% | +$20.7K |
|
873
Southern Copper
SCCO
$143B
| $371K | 0.02% |
+8,455
| New | +$340K |
|
874
TG Therapeutics
TGTX
$8.5B
| $371K | 0.02% |
45,348
-9,953
| -18% | -$87K |
|
|
HDP
875
DELISTED
Hortonworks, Inc.
HDP
| $371K | 0.02% |
+18,452
| New | +$338K |
|
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.