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 | |
|---|---|---|---|---|---|---|
|
LL
1401
DELISTED
LL Flooring Holdings, Inc.
LL
| $168K | 0.01% |
5,377
-7,935
| -60% | -$251K |
|
1402
CALL
Alaska Air
ALK
$5.06B
| $167K | 0.01% |
629
+525
| +505% | +$37.3K |
|
1403
Allison Transmission
ALSN
$10.1B
| $167K | 0.01% |
3,897
-781
| -17% | -$31.8K |
|
1404
CALL
DaVita
DVA
$15.2B
| $167K | 0.01% |
172
+64
| +59% | +$3.94K |
|
1405
CALL
Huntsman Corp
HUN
$2.22B
| $167K | 0.01% |
513
-648
| -56% | -$19.8K |
|
1406
CALL
Texas Capital Bancshares
TCBI
$4.33B
| $167K | 0.01% |
241
+50
| +26% | +$4.33K |
|
1407
World Acceptance Corp
WRLD
$980M
| $167K | 0.01% |
2,079
-3,884
| -65% | -$312K |
|
|
NYMX
1408
DELISTED
Nymox Pharmaceutical Corp
NYMX
| $167K | 0.01% |
50,804
+45,863
| +928% | +$167K |
|
|
CY
1409
DELISTED
Cypress Semiconductor
CY
| $167K | 0.01% |
10,971
-32,161
| -75% | -$511K |
|
1410
Agilent Technologies
A
$39.1B
| $166K | 0.01% |
+2,490
| New | +$168K |
|
1411
BBVA Argentina
BBAR
$3.84B
| $166K | 0.01% |
+6,599
| New | +$146K |
|
1412
Broadridge
BR
$17.1B
| $166K | 0.01% |
+1,835
| New | +$160K |
|
1413
CALL
HF Sinclair
DINO
$16.3B
| $166K | 0.01% |
196
+46
| +31% | +$1.94K |
|
1414
CALL
Mercado Libre
MELI
$92.4B
| $166K | 0.01% |
126
-297
| -70% | -$80.3K |
|
|
CAI
1415
DELISTED
CAI International, Inc.
CAI
| $166K | 0.01% |
5,864
+4,760
| +431% | +$157K |
|
1416
Duluth Holdings
DLTH
$164M
| $165K | 0.01% |
9,283
+7,601
| +452% | +$141K |
|
1417
CALL
Newmont
NEM
$99.6B
| $165K | 0.01% |
765
-576
| -43% | -$21.2K |
|
1418
PUT
Wayfair
W
$11B
| $165K | 0.01% |
1,315
+757
| +136% | +$53.2K |
|
|
DISCK
1419
PUT
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $165K | 0.01% |
2,235
+1,869
| +511% | +$34.4K |
|
1420
ProShares Ultra Bloomberg Natural Gas
BOIL
$437M
| $164K | 0.01% |
3
+2
| +200% | +$146K |
|
1421
CALL
Insulet
PODD
$11.1B
| $164K | 0.01% |
+230
| New | +$15.1K |
|
|
XIN
1422
DELISTED
Xinyuan Real Estate
XIN
| $164K | 0.01% |
2,420
-416
| -15% | -$24.5K |
|
|
XLNX
1423
PUT
DELISTED
Xilinx Inc
XLNX
| $164K | 0.01% |
696
+199
| +40% | +$14.1K |
|
|
GWPH
1424
CALL
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $164K | 0.01% |
150
-86
| -36% | -$10.1K |
|
1425
CALL
Clorox
CLX
$11.5B
| $163K | 0.01% |
190
+66
| +53% | +$8.98K |
|
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.