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 | |
|---|---|---|---|---|---|---|
3876
PUT
Brunswick
BC
$5.23B
| $10K | ﹤0.01% |
43
-18
| -30% | -$980 |
|
3877
PUT
CBRE Group
CBRE
$43.3B
| $10K | ﹤0.01% |
144
-16
| -10% | -$663 |
|
3878
CALL
Conduent
CNDT
$253M
| $10K | ﹤0.01% |
448
+140
| +45% | +$2.19K |
|
3879
PUT
Capri Holdings
CPRI
$1.82B
| $10K | ﹤0.01% |
212
-616
| -74% | -$33.8K |
|
3880
CALL
Crane NXT
CXT
$2.99B
| $10K | ﹤0.01% |
81
-385
| -83% | -$11.3K |
|
3881
PUT
Cytokinetics
CYTK
$10.6B
| $10K | ﹤0.01% |
69
-314
| -82% | -$3.56K |
|
3882
CALL
Donaldson
DCI
$10.7B
| $10K | ﹤0.01% |
171
-48
| -22% | -$2.29K |
|
3883
PUT
Eagle Bancorp
EGBN
$850M
| $10K | ﹤0.01% |
+88
| New | +$5.63K |
|
3884
First Commonwealth Financial
FCF
$2.22B
| $10K | ﹤0.01% |
712
-141
| -17% | -$2.04K |
|
|
FISV
3885
PUT
Fiserv Inc
FISV
$29.7B
| $10K | ﹤0.01% |
+32
| New | +$2.07K |
|
3886
CALL
Fortuna Silver Mines
FSM
$2.54B
| $10K | ﹤0.01% |
371
-49
| -12% | -$221 |
|
|
B
3887
CALL
Barrick Mining
B
$60.9B
| $10K | ﹤0.01% |
190
-565
| -75% | -$8.33K |
|
3888
CALL
Groupon
GRPN
$1.03B
| $10K | ﹤0.01% |
9
-3
| -25% | -$316 |
|
3889
PUT
Interactive Brokers
IBKR
$38.4B
| $10K | ﹤0.01% |
264
-184
| -41% | -$2.51K |
|
3890
CALL
IDT Corp
IDT
$1.67B
| $10K | ﹤0.01% |
337
-20
| -6% | -$219 |
|
3891
CALL
Idexx Laboratories
IDXX
$44.9B
| $10K | ﹤0.01% |
190
+17
| +10% | +$2.68K |
|
3892
CALL
KeyCorp
KEY
$23.8B
| $10K | ﹤0.01% |
171
-549
| -76% | -$10.4K |
|
|
TBHC
3893
DELISTED
The Brand House Collective
TBHC
| $10K | ﹤0.01% |
+907
| New | +$11.1K |
|
3894
CALL
LivePerson
LPSN
$22M
| $10K | ﹤0.01% |
8
+2
| +33% | +$374 |
|
3895
PUT
Macerich
MAC
$7.4B
| $10K | ﹤0.01% |
330
+251
| +318% | +$15.4K |
|
3896
CALL
ManpowerGroup
MAN
$2.6B
| $10K | ﹤0.01% |
83
-4
| -5% | -$500 |
|
3897
CALL
Morningstar
MORN
$7.55B
| $10K | ﹤0.01% |
23
+20
| +667% | +$1.8K |
|
3898
PUT
M&T Bank
MTB
$36.3B
| $10K | ﹤0.01% |
74
+8
| +12% | +$1.33K |
|
3899
CALL
Nordson
NDSN
$16.4B
| $10K | ﹤0.01% |
+18
| New | +$2.31K |
|
|
NGD
3900
CALL
DELISTED
New Gold Inc
NGD
| $10K | ﹤0.01% |
1,065
-723
| -40% | -$2.43K |
|
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.