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 | |
|---|---|---|---|---|---|---|
676
ProShares UltraShort QQQ
QID
$262M
| $539K | 0.02% |
504
+132
| +35% | +$148K |
|
677
PUT
Molson Coors Class B
TAP
$7.47B
| $538K | 0.02% |
492
+12
| +3% | +$971 |
|
678
Global X Uranium ETF
URA
$5.67B
| $538K | 0.02% |
35,773
+27,486
| +332% | +$382K |
|
679
Goodyear
GT
$1.99B
| $537K | 0.02% |
+16,648
| New | +$529K |
|
|
FNSR
680
DELISTED
Finisar Corp
FNSR
| $537K | 0.02% |
26,412
+21,545
| +443% | +$448K |
|
|
FL
681
CALL
DELISTED
Foot Locker
FL
| $536K | 0.02% |
1,091
+844
| +342% | +$31.5K |
|
|
ONCE
682
PUT
DELISTED
Spark Therapeutics, Inc. Common Stock
ONCE
| $535K | 0.02% |
423
+390
| +1,182% | +$28K |
|
683
PUT
Bristol-Myers Squibb
BMY
$126B
| $533K | 0.02% |
3,124
-494
| -14% | -$30.9K |
|
684
CALL
Royal Bank of Canada
RY
$289B
| $532K | 0.02% |
464
+56
| +14% | +$4.44K |
|
685
Zillow
ZG
$6.72B
| $531K | 0.02% |
13,035
+583
| +5% | +$23.9K |
|
686
Century Communities
CCS
$1.98B
| $529K | 0.02% |
17,028
-14,622
| -46% | -$418K |
|
687
CALL
RH
RH
$3.13B
| $528K | 0.02% |
699
+79
| +13% | +$7.14K |
|
688
CALL
Comcast
CMCSA
$80.4B
| $527K | 0.02% |
3,732
+2,225
| +148% | +$83.6K |
|
689
Gen Digital
GEN
$15.1B
| $525K | 0.02% |
+18,729
| New | +$560K |
|
690
CALL
Roku
ROKU
$21B
| $525K | 0.02% |
+3,899
| New | +$134K |
|
|
RHT
691
CALL
DELISTED
Red Hat Inc
RHT
| $525K | 0.02% |
316
-1,214
| -79% | -$149K |
|
|
RTN
692
CALL
DELISTED
Raytheon Company
RTN
| $524K | 0.02% |
359
-156
| -30% | -$29.1K |
|
693
Brighthouse Financial
BHF
$3.6B
| $523K | 0.02% |
8,926
-5,647
| -39% | -$334K |
|
|
K
694
DELISTED
Kellanova
K
| $523K | 0.02% |
8,205
-35,143
| -81% | -$2.12M |
|
695
Norwegian Cruise Line
NCLH
$8.59B
| $523K | 0.02% |
9,833
+7,696
| +360% | +$426K |
|
696
Smith & Wesson
SWBI
$647M
| $520K | 0.02% |
52,728
+47,480
| +905% | +$513K |
|
|
ARNA
697
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $520K | 0.02% |
15,317
-688
| -4% | -$19.6K |
|
|
PEGI
698
DELISTED
Pattern Energy Group Inc. Class A
PEGI
| $520K | 0.02% |
24,226
+23,802
| +5,614% | +$535K |
|
|
VIAB
699
PUT
DELISTED
Viacom Inc. Class B
VIAB
| $516K | 0.02% |
2,737
+784
| +40% | +$21.3K |
|
|
AABA
700
PUT
DELISTED
Altaba Inc
AABA
| $516K | 0.02% |
3,748
+855
| +30% | +$59.5K |
|
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.