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 | |
|---|---|---|---|---|---|---|
2851
CALL
Ford
F
$57.3B
| $32K | ﹤0.01% |
559
-785
| -58% | -$9.66K |
|
2852
CALL
KB Home
KBH
$3.48B
| $32K | ﹤0.01% |
83
-349
| -81% | -$10K |
|
2853
PUT
Kodak
KODK
$806M
| $32K | ﹤0.01% |
196
+58
| +42% | +$268 |
|
2854
Leggett & Platt
LEG
$1.52B
| $32K | ﹤0.01% |
686
-1,774
| -72% | -$83.7K |
|
2855
Lipocine
LPCN
$17.1M
| $32K | ﹤0.01% |
+559
| New | +$34.8K |
|
2856
PUT
Nelnet
NNI
$4.79B
| $32K | ﹤0.01% |
20
-19
| -49% | -$1.03K |
|
2857
CALL
NOV
NOV
$7.45B
| $32K | ﹤0.01% |
229
+36
| +19% | +$1.22K |
|
2858
CALL
Olin
OLN
$2.64B
| $32K | ﹤0.01% |
186
-146
| -44% | -$5.19K |
|
|
SEE
2859
DELISTED
Sealed Air
SEE
| $32K | ﹤0.01% |
+656
| New | +$30.1K |
|
2860
CALL
Twilio
TWLO
$29.1B
| $32K | ﹤0.01% |
542
-133
| -20% | -$3.73K |
|
2861
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.84B
| $32K | ﹤0.01% |
319
+289
| +963% | +$43.1K |
|
2862
Vanguard Total International Stock ETF
VXUS
$153B
| $32K | ﹤0.01% |
578
-1,842
| -76% | -$103K |
|
2863
PUT
XPO
XPO
$25B
| $32K | ﹤0.01% |
3,614
+2,125
| +143% | +$54.3K |
|
|
ONIT
2864
PUT
Onity Group
ONIT
$333M
| $32K | ﹤0.01% |
44
-37
| -46% | -$1.86K |
|
|
CALA
2865
CALL
DELISTED
Calithera Biosciences, Inc
CALA
| $32K | ﹤0.01% |
29
+28
| +2,800% | +$7.17K |
|
|
NUAN
2866
CALL
DELISTED
Nuance Communications, Inc.
NUAN
| $32K | ﹤0.01% |
+236
| New | +$3.17K |
|
|
HCR
2867
PUT
DELISTED
Hi-Crush Inc. Common Stock
HCR
| $32K | ﹤0.01% |
238
+106
| +80% | +$1.06K |
|
|
P
2868
PUT
DELISTED
Pandora Media Inc
P
| $32K | ﹤0.01% |
722
+45
| +7% | +$269 |
|
|
LKM
2869
CALL
DELISTED
Link Motion Inc.
LKM
| $32K | ﹤0.01% |
518
+226
| +77% | +$880 |
|
|
OA
2870
PUT
DELISTED
Orbital ATK, Inc.
OA
| $32K | ﹤0.01% |
247
-243
| -50% | -$32.2K |
|
|
CHIX
2871
DELISTED
Global X MSCI China Financials ETF
CHIX
| $32K | ﹤0.01% |
1,829
+956
| +110% | +$17K |
|
|
BAS
2872
DELISTED
Basis Energy Services, Inc.
BAS
| $32K | ﹤0.01% |
1,380
-15,604
| -92% | -$324K |
|
2873
Akebia Therapeutics
AKBA
$327M
| $31K | ﹤0.01% |
2,121
-320
| -13% | -$5.31K |
|
2874
CALL
AMN Healthcare
AMN
$1.28B
| $31K | ﹤0.01% |
42
-14
| -25% | -$638 |
|
2875
CALL
Brown-Forman Class B
BF.B
$12B
| $31K | ﹤0.01% |
56
+45
| +409% | +$1.72K |
|
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.