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 | |
|---|---|---|---|---|---|---|
3676
PUT
Match Group
MTCH
$9.16B
| $13K | ﹤0.01% |
571
+199
| +53% | +$5.58K |
|
3677
CALL
Murphy Oil
MUR
$5.25B
| $13K | ﹤0.01% |
98
-47
| -32% | -$1.31K |
|
3678
CALL
McEwen Inc
MUX
$1.03B
| $13K | ﹤0.01% |
50
-87
| -64% | -$1.76K |
|
3679
PUT
NRG Energy
NRG
$26.9B
| $13K | ﹤0.01% |
732
-129
| -15% | -$3.51K |
|
3680
PUT
Nu Skin
NUS
$255M
| $13K | ﹤0.01% |
131
-83
| -39% | -$5.37K |
|
3681
Novavax
NVAX
$1.21B
| $13K | ﹤0.01% |
559
-518
| -48% | -$12.6K |
|
3682
CALL
Oshkosh
OSK
$9.51B
| $13K | ﹤0.01% |
48
-247
| -84% | -$21.6K |
|
3683
PUT
PACCAR
PCAR
$72.7B
| $13K | ﹤0.01% |
312
+18
| +6% | +$851 |
|
3684
PUT
Polaris
PII
$4.07B
| $13K | ﹤0.01% |
69
-110
| -61% | -$13.1K |
|
3685
CALL
PTC Therapeutics
PTCT
$6.25B
| $13K | ﹤0.01% |
77
-354
| -82% | -$5.99K |
|
3686
QuinStreet
QNST
$916M
| $13K | ﹤0.01% |
1,635
-2,321
| -59% | -$19.7K |
|
|
SFIX
3687
CALL
Stitch Fix
SFIX
$563M
| $13K | ﹤0.01% |
+26
| New | +$592 |
|
|
SRDX
3688
PUT
DELISTED
Surmodics
SRDX
| $13K | ﹤0.01% |
+20
| New | +$610 |
|
3689
CALL
Sempra
SRE
$59.2B
| $13K | ﹤0.01% |
+814
| New | +$47.2K |
|
|
SRG
3690
CALL
Seritage Growth Properties
SRG
$129M
| $13K | ﹤0.01% |
200
+110
| +122% | +$4.59K |
|
3691
CALL
Alaunos Therapeutics
TCRT
$4.64M
| $13K | ﹤0.01% |
3
| – | – |
|
3692
Tredegar Corp
TG
$263M
| $13K | ﹤0.01% |
+692
| New | +$13.3K |
|
3693
TriNet
TNET
$3.14B
| $13K | ﹤0.01% |
+313
| New | +$12.5K |
|
3694
Trustmark
TRMK
$2.74B
| $13K | ﹤0.01% |
+418
| New | +$13.8K |
|
3695
PUT
Tyler Technologies
TYL
$13.7B
| $13K | ﹤0.01% |
36
+25
| +227% | +$4.44K |
|
3696
PUT
Wheaton Precious Metals
WPM
$49.8B
| $13K | ﹤0.01% |
67
-63
| -48% | -$1.31K |
|
3697
CALL
Wolverine World Wide
WWW
$1.71B
| $13K | ﹤0.01% |
219
+195
| +813% | +$5.63K |
|
3698
PUT
Yum China
YUMC
$15.6B
| $13K | ﹤0.01% |
132
-109
| -45% | -$4.48K |
|
|
ENLC
3699
CALL
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $13K | ﹤0.01% |
256
-259
| -50% | -$4.25K |
|
|
AMRS
3700
CALL
DELISTED
Amyris Inc.
AMRS
| $13K | ﹤0.01% |
724
+522
| +258% | +$1.76K |
|
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.