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 | |
|---|---|---|---|---|---|---|
776
Leidos
LDOS
$13.7B
| $439K | 0.02% |
6,804
-1,260
| -16% | -$79K |
|
777
CALL
Dollar Tree
DLTR
$22.6B
| $438K | 0.02% |
323
-28
| -8% | -$2.74K |
|
778
National Health Investors
NHI
$3.87B
| $438K | 0.02% |
+5,811
| New | +$451K |
|
|
ESIO
779
DELISTED
Electro Scientific Industries
ESIO
| $438K | 0.02% |
20,469
+4,867
| +31% | +$97.7K |
|
780
GATX Corp
GATX
$6.45B
| $437K | 0.02% |
+7,037
| New | +$427K |
|
781
Paycom
PAYC
$6.42B
| $437K | 0.02% |
5,444
+5,339
| +5,085% | +$427K |
|
|
UWC
782
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $437K | 0.02% |
2,062
-89
| -4% | -$18.9K |
|
783
PUT
eBay
EBAY
$48.5B
| $436K | 0.02% |
3,528
+2,214
| +168% | +$82.2K |
|
|
HTZ
784
DELISTED
Hertz Global Holdings, Inc.
HTZ
| $436K | 0.02% |
+22,733
| New | +$439K |
|
785
CALL
ProShares Ultra S&P500
SSO
$7.8B
| $435K | 0.02% |
4,880
-7,144
| -59% | -$92.4K |
|
786
Invesco Mortgage Capital
IVR
$782M
| $433K | 0.02% |
+2,433
| New | +$430K |
|
|
PXD
787
DELISTED
Pioneer Natural Resource Co.
PXD
| $432K | 0.02% |
2,502
-21,584
| -90% | -$3.32M |
|
|
NLSN
788
DELISTED
Nielsen Holdings plc
NLSN
| $432K | 0.02% |
11,871
+8,978
| +310% | +$341K |
|
789
Apogee Enterprises
APOG
$835M
| $431K | 0.02% |
9,430
+5,371
| +132% | +$256K |
|
790
HF Sinclair
DINO
$16.2B
| $431K | 0.02% |
8,424
-28,036
| -77% | -$1.18M |
|
791
Eagle Materials
EXP
$6.36B
| $431K | 0.02% |
+3,812
| New | +$412K |
|
792
National Beverage
FIZZ
$2.82B
| $431K | 0.02% |
8,848
-4,040
| -31% | -$207K |
|
793
OSI Systems
OSIS
$3.5B
| $431K | 0.02% |
+6,703
| New | +$563K |
|
794
PUT
SPDR Gold Trust
GLD
$130B
| $429K | 0.02% |
3,806
-2,164
| -36% | -$262K |
|
|
LXFT
795
DELISTED
Luxoft Holding, Inc.
LXFT
| $429K | 0.02% |
7,714
+7,016
| +1,005% | +$351K |
|
|
BZUN
796
Baozun
BZUN
$142M
| $428K | 0.02% |
13,591
-6,854
| -34% | -$221K |
|
797
Perrigo
PRGO
$1.4B
| $428K | 0.02% |
+4,912
| New | +$422K |
|
798
Xerox
XRX
$335M
| $428K | 0.02% |
+14,696
| New | +$446K |
|
|
B
799
Barrick Mining
B
$61.9B
| $427K | 0.02% |
29,544
-94,023
| -76% | -$1.39M |
|
800
CALL
Sinclair Inc
SBGI
$962M
| $427K | 0.02% |
1,245
+279
| +29% | +$9.24K |
|
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.