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 | |
|---|---|---|---|---|---|---|
|
SC
601
DELISTED
SANTANDER CONSUMER USA HOLDINGS INC
SC
| $628K | 0.03% |
33,743
+26,177
| +346% | +$438K |
|
|
ALXN
602
PUT
DELISTED
Alexion Pharmaceuticals
ALXN
| $628K | 0.03% |
702
-556
| -44% | -$67.7K |
|
603
CALL
Halliburton
HAL
$27.6B
| $627K | 0.03% |
2,059
-29
| -1% | -$1.28K |
|
604
PUT
AT&T
T
$160B
| $627K | 0.03% |
8,916
+2,156
| +32% | +$58.9K |
|
605
Marriott Vacations Worldwide
VAC
$3.33B
| $618K | 0.03% |
+4,575
| New | +$604K |
|
606
KLA
KLAC
$280B
| $617K | 0.03% |
+58,740
| New | +$619K |
|
607
CALL
Marriott International
MAR
$97.5B
| $616K | 0.03% |
1,149
+725
| +171% | +$89K |
|
|
HYGS
608
DELISTED
Hydrogenics Corp
HYGS
| $616K | 0.03% |
55,570
-2,633
| -5% | -$26.2K |
|
609
Assured Guaranty
AGO
$3.74B
| $614K | 0.03% |
18,135
-17,639
| -49% | -$640K |
|
|
DLPH
610
DELISTED
Delphi Technologies PLC Ordinary Shares
DLPH
| $614K | 0.03% |
+11,709
| New | +$609K |
|
|
SODA
611
DELISTED
SodaStream International Ltd
SODA
| $614K | 0.03% |
8,732
+3,514
| +67% | +$233K |
|
612
CALL
Estee Lauder
EL
$29.9B
| $613K | 0.03% |
968
-155
| -14% | -$18.6K |
|
613
Schwab US Large- Cap ETF
SCHX
$71.7B
| $612K | 0.03% |
+57,600
| New | +$597K |
|
614
CALL
Hain Celestial
HAIN
$51.4M
| $610K | 0.03% |
1,554
+657
| +73% | +$26K |
|
615
Targa Resources
TRGP
$61.1B
| $608K | 0.03% |
+12,564
| New | +$562K |
|
616
PUT
Wynn Resorts
WYNN
$9.79B
| $608K | 0.03% |
4,718
+1,656
| +54% | +$255K |
|
|
ZGNX
617
CALL
DELISTED
Zogenix, Inc.
ZGNX
| $607K | 0.03% |
462
-837
| -64% | -$32.2K |
|
|
ATVI
618
PUT
DELISTED
Activision Blizzard
ATVI
| $607K | 0.03% |
2,351
| – | – |
|
619
Nexstar Media Group
NXST
$5.55B
| $603K | 0.03% |
7,722
-20,522
| -73% | -$1.38M |
|
620
OneMain Financial
OMF
$6.91B
| $603K | 0.03% |
23,224
+14,773
| +175% | +$408K |
|
621
iShares Russell Mid-Cap Growth ETF
IWP
$20.3B
| $598K | 0.03% |
9,924
+6,682
| +206% | +$393K |
|
622
Mid-America Apartment Communities
MAA
$15.3B
| $598K | 0.03% |
5,951
+2,922
| +96% | +$303K |
|
623
Twilio
TWLO
$27.8B
| $598K | 0.03% |
+25,380
| New | +$712K |
|
|
RGC
624
DELISTED
Regal Entertainment Group
RGC
| $598K | 0.03% |
26,026
-34,465
| -57% | -$635K |
|
625
PUT
JPMorgan Chase
JPM
$926B
| $597K | 0.03% |
6,014
-1,617
| -21% | -$164K |
|
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.