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 | |
|---|---|---|---|---|---|---|
551
Lamar Advertising Co
LAMR
$16.1B
| $692K | 0.03% |
9,333
+3,970
| +74% | +$290K |
|
552
PUT
Ulta Beauty
ULTA
$20.8B
| $690K | 0.03% |
964
-286
| -23% | -$60.5K |
|
|
JOBS
553
DELISTED
51job Inc
JOBS
| $689K | 0.03% |
11,334
+8,364
| +282% | +$512K |
|
554
CALL
DuPont de Nemours
DD
$18.9B
| $688K | 0.03% |
934
+452
| +94% | +$81.4K |
|
|
MNK
555
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $687K | 0.03% |
30,478
+20,881
| +218% | +$560K |
|
|
CYBR
556
DELISTED
CyberArk
CYBR
| $686K | 0.03% |
16,594
+6,617
| +66% | +$290K |
|
557
Costco
COST
$411B
| $678K | 0.03% |
+3,647
| New | +$630K |
|
558
PUT
TripAdvisor
TRIP
$1.61B
| $678K | 0.03% |
1,909
+1,377
| +259% | +$49.7K |
|
559
CALL
Energous
WATT
$84.8M
| $678K | 0.03% |
2
+1
| +100% | +$6.29K |
|
560
Jack in the Box
JACK
$272M
| $672K | 0.03% |
6,856
-2,577
| -27% | -$262K |
|
561
Pacira BioSciences
PCRX
$1.01B
| $672K | 0.03% |
14,738
-21,221
| -59% | -$841K |
|
|
AUD
562
DELISTED
Audacy, Inc.
AUD
| $672K | 0.03% |
+62,247
| New | +$708K |
|
|
ILG
563
DELISTED
ILG, Inc Common Stock
ILG
| $672K | 0.03% |
23,617
-19,895
| -46% | -$574K |
|
564
WisdomTree Europe Hedged Equity Fund
HEDJ
$1.84B
| $670K | 0.03% |
21,038
-33,020
| -61% | -$1.07M |
|
565
Nutanix
NTNX
$14.4B
| $669K | 0.03% |
18,963
+2,147
| +13% | +$65K |
|
|
566
TripAdvisor
TRIP
$1.61B
| $667K | 0.03% |
+19,364
| New | +$700K |
|
567
Kennametal
KMT
$2.65B
| $666K | 0.03% |
+13,776
| New | +$614K |
|
|
JUNO
568
CALL
DELISTED
Juno Therapeutics, Inc.
JUNO
| $666K | 0.03% |
953
+360
| +61% | +$18K |
|
569
Marvell Technology
MRVL
$189B
| $664K | 0.03% |
30,930
+12,482
| +68% | +$255K |
|
570
Universal Display
OLED
$3.81B
| $664K | 0.03% |
3,849
+3,334
| +647% | +$532K |
|
571
CALL
Palo Alto Networks
PANW
$273B
| $664K | 0.03% |
7,422
-1,548
| -17% | -$37.7K |
|
572
PUT
Incyte
INCY
$23.1B
| $663K | 0.03% |
656
+100
| +18% | +$10.5K |
|
|
KW
573
DELISTED
Kennedy-Wilson Holdings
KW
| $663K | 0.03% |
38,226
-28,810
| -43% | -$543K |
|
574
CALL
Las Vegas Sands
LVS
$30B
| $663K | 0.03% |
1,672
+79
| +5% | +$5.27K |
|
575
US Foods
USFD
$21.2B
| $663K | 0.03% |
20,789
+20,270
| +3,906% | +$574K |
|
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.