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 | |
|---|---|---|---|---|---|---|
1901
Repligen
RGEN
$7.44B
| $89K | ﹤0.01% |
2,463
-1,222
| -33% | -$44.2K |
|
|
SIEN
1902
PUT
DELISTED
Sientra, Inc.
SIEN
| $89K | ﹤0.01% |
20
+18
| +900% | +$2.62K |
|
|
CTB
1903
DELISTED
Cooper Tire & Rubber Co.
CTB
| $89K | ﹤0.01% |
+2,542
| New | +$89.8K |
|
1904
PUT
American Tower
AMT
$77.7B
| $88K | ﹤0.01% |
592
+88
| +17% | +$12.6K |
|
1905
CALL
CoStar Group
CSGP
$11.3B
| $88K | ﹤0.01% |
140
-680
| -83% | -$19.9K |
|
1906
Invesco DB Base Metals Fund
DBB
$306M
| $88K | ﹤0.01% |
+4,558
| New | +$84.5K |
|
1907
PUT
Ionis Pharmaceuticals
IONS
$9.35B
| $88K | ﹤0.01% |
505
-26
| -5% | -$1.43K |
|
1908
CALL
Melco Resorts & Entertainment
MLCO
$2.1B
| $88K | ﹤0.01% |
256
+114
| +80% | +$2.91K |
|
1909
NBT Bancorp
NBTB
$2.72B
| $88K | ﹤0.01% |
+2,409
| New | +$90.9K |
|
1910
PUT
Newmont
NEM
$98.2B
| $88K | ﹤0.01% |
593
+51
| +9% | +$1.88K |
|
1911
CALL
Novartis
NVS
$295B
| $88K | ﹤0.01% |
436
+196
| +82% | +$14.8K |
|
|
PF
1912
PUT
DELISTED
Pinnacle Foods, Inc.
PF
| $88K | ﹤0.01% |
456
+2
| +0.4% | +$113 |
|
|
HIMX
1913
PUT
Himax Technologies
HIMX
$2.2B
| $87K | ﹤0.01% |
1,335
+1,067
| +398% | +$11.6K |
|
1914
CALL
Heron Therapeutics
HRTX
$86.3M
| $87K | ﹤0.01% |
485
+147
| +43% | +$2.4K |
|
1915
CALL
Progressive
PGR
$124B
| $87K | ﹤0.01% |
190
-255
| -57% | -$13.2K |
|
1916
PUT
Xerox
XRX
$337M
| $87K | ﹤0.01% |
414
+56
| +16% | +$1.7K |
|
|
CPE
1917
DELISTED
Callon Petroleum Company
CPE
| $87K | ﹤0.01% |
720
+608
| +543% | +$67.3K |
|
|
DGL
1918
DELISTED
Invesco DB Gold Fund
DGL
| $87K | ﹤0.01% |
2,107
+799
| +61% | +$32.4K |
|
|
MSCC
1919
DELISTED
Microsemi Corp
MSCC
| $87K | ﹤0.01% |
+1,703
| New | +$89.5K |
|
1920
CALL
Duke Energy
DUK
$102B
| $86K | ﹤0.01% |
445
-394
| -47% | -$34.4K |
|
1921
Geron
GERN
$911M
| $86K | ﹤0.01% |
47,991
+28,823
| +150% | +$58.2K |
|
1922
CALL
Galicia Financial Group
GGAL
$7.92B
| $86K | ﹤0.01% |
43
-178
| -81% | -$10.2K |
|
1923
Global Payments
GPN
$22.1B
| $86K | ﹤0.01% |
+859
| New | +$85.9K |
|
|
KNDI
1924
Kandi Technologies Group
KNDI
$65.3M
| $86K | ﹤0.01% |
12,781
+11,878
| +1,315% | +$88.7K |
|
1925
CALL
Eli Lilly
LLY
$1.07T
| $86K | ﹤0.01% |
944
+151
| +19% | +$12.8K |
|
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.