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 | |
|---|---|---|---|---|---|---|
401
Baker Hughes
BKR
$56.2B
| $1M | 0.04% |
31,747
+16,296
| +105% | +$523K |
|
402
CALL
Macy's
M
$6.4B
| $999K | 0.04% |
4,494
+2,197
| +96% | +$48.2K |
|
|
ABMD
403
DELISTED
Abiomed Inc
ABMD
| $996K | 0.04% |
5,315
+828
| +18% | +$155K |
|
404
CALL
D.R. Horton
DHI
$40.4B
| $992K | 0.04% |
1,260
-53
| -4% | -$2.47K |
|
405
iShares US Transportation ETF
IYT
$2.33B
| $992K | 0.04% |
20,716
+5,012
| +32% | +$226K |
|
|
TIME
406
DELISTED
Time Inc.
TIME
| $991K | 0.04% |
53,727
-6,668
| -11% | -$99.7K |
|
|
RHT
407
DELISTED
Red Hat Inc
RHT
| $985K | 0.04% |
+8,202
| New | +$1.01M |
|
|
EXAS
408
CALL
DELISTED
Exact Sciences
EXAS
| $981K | 0.04% |
566
-108
| -16% | -$5.77K |
|
409
ProShares UltraShort Gold
GLL
$123M
| $973K | 0.04% |
+3,520
| New | +$1.01M |
|
|
GRA
410
DELISTED
W.R. Grace & Co.
GRA
| $972K | 0.04% |
13,870
+13,232
| +2,074% | +$959K |
|
411
MKS Inc
MKSI
$23.3B
| $969K | 0.04% |
+10,256
| New | +$1.02M |
|
412
CALL
Ross Stores
ROST
$76.4B
| $966K | 0.04% |
692
-61
| -8% | -$4.27K |
|
413
PUT
Qualcomm
QCOM
$185B
| $965K | 0.04% |
7,072
+2,860
| +68% | +$173K |
|
414
Republic Services
RSG
$66.6B
| $964K | 0.04% |
14,261
+14,161
| +14,161% | +$913K |
|
|
GCAP
415
DELISTED
Gain Capital Holdings, Inc.
GCAP
| $959K | 0.04% |
+95,953
| New | +$688K |
|
|
CCMP
416
DELISTED
CMC Materials, Inc. Common Stock
CCMP
| $954K | 0.04% |
10,148
+9,940
| +4,779% | +$915K |
|
417
PUT
JD.com
JD
$40.7B
| $948K | 0.04% |
4,786
-4,258
| -47% | -$168K |
|
418
EPAM Systems
EPAM
$4.52B
| $947K | 0.04% |
8,819
+6,956
| +373% | +$688K |
|
|
DYN
419
DELISTED
Dynegy, Inc.
DYN
| $938K | 0.04% |
79,217
+32,947
| +71% | +$368K |
|
420
Bunge Global
BG
$24B
| $936K | 0.04% |
13,961
-51,944
| -79% | -$3.53M |
|
421
Floor & Decor
FND
$5.86B
| $933K | 0.04% |
+19,175
| New | +$775K |
|
422
Vipshop
VIPS
$7.05B
| $932K | 0.04% |
79,526
-52,798
| -40% | -$467K |
|
423
DaVita
DVA
$14.9B
| $929K | 0.04% |
+12,865
| New | +$792K |
|
424
iShares MSCI USA Min Vol Factor ETF
USMV
$23.1B
| $929K | 0.04% |
+17,617
| New | +$914K |
|
425
CALL
Alcoa
AA
$12.2B
| $927K | 0.04% |
1,232
+444
| +56% | +$20.3K |
|
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.