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 | |
|---|---|---|---|---|---|---|
|
MSGN
1326
DELISTED
MSG Networks Inc.
MSGN
| $186K | 0.01% |
+9,196
| New | +$177K |
|
|
EBIX
1327
CALL
DELISTED
Ebix Inc
EBIX
| $186K | 0.01% |
131
+48
| +58% | +$3.49K |
|
|
MTSC
1328
DELISTED
MTS Systems Corp
MTSC
| $186K | 0.01% |
+3,478
| New | +$187K |
|
1329
Nokia
NOK
$54.3B
| $185K | 0.01% |
39,876
+27,478
| +222% | +$142K |
|
1330
RLJ Lodging Trust
RLJ
$1.83B
| $185K | 0.01% |
+8,466
| New | +$184K |
|
1331
Sensata Technologies
ST
$6.63B
| $185K | 0.01% |
3,638
+3,117
| +598% | +$154K |
|
1332
PUT
Twilio
TWLO
$28.1B
| $185K | 0.01% |
683
+52
| +8% | +$1.46K |
|
|
COHR
1333
CALL
DELISTED
Coherent Inc
COHR
| $185K | 0.01% |
141
-55
| -28% | -$15.3K |
|
|
PIR
1334
DELISTED
Pier 1 Imports, Inc.
PIR
| $185K | 0.01% |
2,238
+2,102
| +1,546% | +$187K |
|
1335
CALL
Columbia Sportswear
COLM
$3.16B
| $184K | 0.01% |
109
-79
| -42% | -$5.18K |
|
1336
iShare MSCI Eurozone ETF
EZU
$9.36B
| $184K | 0.01% |
4,247
-9,595
| -69% | -$417K |
|
1337
Ingevity
NGVT
$2.56B
| $184K | 0.01% |
2,623
+2,012
| +329% | +$145K |
|
|
FRGI
1338
DELISTED
Fiesta Restaurant Group, Inc.
FRGI
| $184K | 0.01% |
9,729
+603
| +7% | +$10.8K |
|
|
MLNX
1339
CALL
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $184K | 0.01% |
398
+269
| +209% | +$14.2K |
|
1340
CALL
International Paper
IP
$20.1B
| $183K | 0.01% |
720
-288
| -29% | -$15.5K |
|
|
SEP
1341
DELISTED
Spectra Engy Parters Lp
SEP
| $183K | 0.01% |
+4,638
| New | +$195K |
|
1342
Q2 Holdings
QTWO
$3.31B
| $182K | 0.01% |
4,953
+4,338
| +705% | +$178K |
|
1343
PUT
Verizon
VZ
$183B
| $182K | 0.01% |
3,152
+932
| +42% | +$45.8K |
|
|
SINA
1344
CALL
DELISTED
Sina Corp
SINA
| $182K | 0.01% |
559
+41
| +8% | +$4.38K |
|
1345
iShares MSCI Europe Financials ETF
EUFN
$3.82B
| $181K | 0.01% |
+7,787
| New | +$180K |
|
|
PINC
1346
DELISTED
Premier
PINC
| $181K | 0.01% |
6,216
+6,025
| +3,154% | +$186K |
|
1347
PUT
SiriusXM
SIRI
$10.1B
| $181K | 0.01% |
143
-42
| -23% | -$2.32K |
|
1348
WisdomTree
WT
$3.01B
| $181K | 0.01% |
14,453
-11,421
| -44% | -$131K |
|
1349
Boot Barn
BOOT
$4.48B
| $180K | 0.01% |
10,856
+10,652
| +5,222% | +$128K |
|
1350
CALL
Sysco
SYY
$39.1B
| $180K | 0.01% |
498
-142
| -22% | -$8.05K |
|
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.