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 | |
|---|---|---|---|---|---|---|
1526
TransUnion
TRU
$14.8B
| $144K | 0.01% |
+2,624
| New | +$140K |
|
1527
Calumet Specialty Products
CLMT
$3.63B
| $143K | 0.01% |
18,592
+14,845
| +396% | +$124K |
|
1528
CALL
Macerich
MAC
$7.32B
| $143K | 0.01% |
455
+311
| +216% | +$19K |
|
1529
PUT
Intellia Therapeutics
NTLA
$1.5B
| $143K | 0.01% |
272
+157
| +137% | +$3.63K |
|
|
SEE
1530
CALL
DELISTED
Sealed Air
SEE
| $143K | 0.01% |
613
+179
| +41% | +$8.22K |
|
1531
Spok Holdings
SPOK
$221M
| $143K | 0.01% |
+9,192
| New | +$154K |
|
|
ESL
1532
DELISTED
Esterline Technologies
ESL
| $143K | 0.01% |
+1,917
| New | +$157K |
|
1533
CALL
Agilent Technologies
A
$39.1B
| $142K | 0.01% |
287
+209
| +268% | +$14.1K |
|
1534
PUT
Delta Air Lines
DAL
$55.9B
| $142K | 0.01% |
2,851
+343
| +14% | +$17.9K |
|
1535
PUT
First Solar
FSLR
$21.8B
| $142K | 0.01% |
1,289
-235
| -15% | -$13.8K |
|
1536
PUT
General Mills
GIS
$19.2B
| $142K | 0.01% |
1,544
-15
| -1% | -$811 |
|
1537
PUT
Marathon Digital Holdings
MARA
$4.62B
| $142K | 0.01% |
174
+171
| +5,700% | +$2.01K |
|
1538
CALL
Merck
MRK
$324B
| $142K | 0.01% |
2,739
-127
| -4% | -$7.04K |
|
1539
CALL
Voya Financial
VOYA
$8.94B
| $142K | 0.01% |
275
+147
| +115% | +$6.32K |
|
1540
PUT
United Parks & Resorts
PRKS
$2.11B
| $142K | 0.01% |
386
-695
| -64% | -$8.64K |
|
|
DERM
1541
PUT
DELISTED
Dermira, Inc.
DERM
| $142K | 0.01% |
259
-1
| -0.4% | -$27 |
|
|
KYNB
1542
PUT
Kyntra Bio
KYNB
$28.5M
| $141K | 0.01% |
16
-8
| -33% | -$10K |
|
|
OTIC
1543
DELISTED
Otonomy, Inc.
OTIC
| $141K | 0.01% |
25,472
-2,004
| -7% | -$8.7K |
|
1544
Penske Automotive Group
PAG
$14.3B
| $140K | 0.01% |
+2,928
| New | +$138K |
|
1545
CALL
Red Robin
RRGB
$134M
| $140K | 0.01% |
229
+142
| +163% | +$8.17K |
|
|
SFIX
1546
Stitch Fix
SFIX
$478M
| $140K | 0.01% |
+5,450
| New | +$124K |
|
|
WPX
1547
DELISTED
WPX Energy, Inc.
WPX
| $140K | 0.01% |
+10,007
| New | +$121K |
|
|
EMES
1548
PUT
DELISTED
Emerge Energy Services LP
EMES
| $140K | 0.01% |
328
+29
| +10% | +$227 |
|
1549
PUT
Coty
COTY
$2.33B
| $139K | 0.01% |
1,728
+1,011
| +141% | +$17.3K |
|
1550
Constellium
CSTM
$3.96B
| $139K | 0.01% |
12,509
+11,349
| +978% | +$121K |
|
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.