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 | |
|---|---|---|---|---|---|---|
1601
Gogo Inc
GOGO
$515M
| $130K | 0.01% |
11,548
-14,683
| -56% | -$156K |
|
1602
Helmerich & Payne
HP
$3.53B
| $130K | 0.01% |
2,020
-19,012
| -90% | -$1.07M |
|
1603
PUT
Perrigo
PRGO
$1.4B
| $130K | 0.01% |
315
-414
| -57% | -$35.6K |
|
1604
Stellantis
STLA
$16.5B
| $130K | 0.01% |
+7,328
| New | +$129K |
|
|
CS
1605
CALL
DELISTED
Credit Suisse Group
CS
| $130K | 0.01% |
604
+43
| +8% | +$711 |
|
|
ATCO
1606
DELISTED
Atlas Corp.
ATCO
| $130K | 0.01% |
19,373
+2,013
| +12% | +$13.1K |
|
|
NAV
1607
CALL
DELISTED
Navistar International
NAV
| $130K | 0.01% |
414
+48
| +13% | +$2K |
|
|
STRP
1608
PUT
DELISTED
Straight Path Communications Inc.
STRP
| $130K | 0.01% |
204
-729
| -78% | -$132K |
|
|
CMA
1609
CALL
DELISTED
Comerica
CMA
| $129K | 0.01% |
265
+130
| +96% | +$10.5K |
|
|
JO
1610
DELISTED
iPath Bloomberg Coffee Subindex Total Return ETN due June 24, 2038
JO
| $129K | 0.01% |
8,272
-22,528
| -73% | -$359K |
|
1611
VirnetX Holding Corp
VHC
$52.3M
| $128K | 0.01% |
1,732
+918
| +113% | +$89.3K |
|
|
MATR
1612
DELISTED
Mattersight Corp.
MATR
| $128K | 0.01% |
50,454
+1,483
| +3% | +$3.93K |
|
1613
CALL
Axalta
AXTA
$7.01B
| $127K | 0.01% |
1,041
-400
| -28% | -$12.7K |
|
1614
CALL
Citizens Financial Group
CFG
$30.4B
| $127K | 0.01% |
450
+382
| +562% | +$14.9K |
|
1615
PUT
United Parcel Service
UPS
$97.6B
| $127K | 0.01% |
1,766
+1,095
| +163% | +$129K |
|
1616
CALL
Vera Bradley
VRA
$105M
| $127K | 0.01% |
466
+342
| +276% | +$3.09K |
|
|
XNET
1617
CALL
Xunlei
XNET
$351M
| $127K | 0.01% |
+706
| New | +$8.1K |
|
|
CTXS
1618
CALL
DELISTED
Citrix Systems Inc
CTXS
| $127K | 0.01% |
396
+91
| +30% | +$7.71K |
|
|
WIFI
1619
DELISTED
Boingo Wireless, Inc.
WIFI
| $127K | 0.01% |
+5,675
| New | +$130K |
|
1620
Deckers Outdoor
DECK
$13.3B
| $126K | 0.01% |
+9,450
| New | +$113K |
|
1621
CALL
Illinois Tool Works
ITW
$81.4B
| $126K | 0.01% |
334
+203
| +155% | +$32.4K |
|
|
SOHU
1622
Sohu.com
SOHU
$336M
| $126K | 0.01% |
2,919
+203
| +7% | +$10.9K |
|
1623
Interface
TILE
$1.91B
| $126K | 0.01% |
+5,018
| New | +$118K |
|
1624
PUT
YPF
YPF
$20.2B
| $126K | 0.01% |
3,815
+130
| +4% | +$2.98K |
|
|
LCI
1625
PUT
DELISTED
Lannett Company, Inc.
LCI
| $126K | 0.01% |
357
+300
| +526% | +$29.2K |
|
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.