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 |
Goldman Sachs
GS
|
+$40.4M |
| 2 |
NVIDIA
NVDA
|
+$23.1M |
| 3 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$21.5M |
| 4 |
Wells Fargo
WFC
|
+$20.8M |
| 5 |
Micron Technology
MU
|
+$20M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Citigroup
C
|
+$21.4M |
| 2 |
Apple
AAPL
|
+$15.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$14.4M |
| 4 |
Eli Lilly
LLY
|
+$10.5M |
| 5 |
iShares Biotechnology ETF
IBB
|
+$8.06M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 9.73% |
| 2 | Communication Services | 9.25% |
| 3 | Consumer Discretionary | 8.76% |
| 4 | Healthcare | 8.53% |
| 5 | Financials | 7.38% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3626
iShares MSCI BIC ETF
BKF
$76.8M
| $14K | ﹤0.01% |
+386
| New | +$13.5K |
|
3627
Calix
CALX
$2.34B
| $14K | ﹤0.01% |
+2,005
| New | +$14.2K |
|
3628
CALL
Celldex Therapeutics
CLDX
$2.79B
| $14K | ﹤0.01% |
41
+28
| +215% | +$1.46K |
|
3629
PUT
Constellium
CSTM
$3.96B
| $14K | ﹤0.01% |
62
-33
| -35% | -$236 |
|
3630
CALL
Ecolab
ECL
$79.6B
| $14K | ﹤0.01% |
69
+22
| +47% | +$2.69K |
|
3631
PUT
New Oriental
EDU
$8.08B
| $14K | ﹤0.01% |
176
+66
| +60% | +$3.35K |
|
3632
CALL
Etsy
ETSY
$8.21B
| $14K | ﹤0.01% |
425
+97
| +30% | +$1.14K |
|
3633
iShares MSCI Europe Financials ETF
EUFN
$4.05B
| $14K | ﹤0.01% |
+710
| New | +$14K |
|
3634
Gladstone Capital
GLAD
$436M
| $14K | ﹤0.01% |
778
+623
| +402% | +$11.6K |
|
3635
Hudbay
HBM
$9.67B
| $14K | ﹤0.01% |
2,226
+1,504
| +208% | +$11.2K |
|
3636
CALL
Helen of Troy
HELE
$672M
| $14K | ﹤0.01% |
100
+64
| +178% | +$6.04K |
|
3637
CALL
Hartford Financial Services
HIG
$39.3B
| $14K | ﹤0.01% |
461
-79
| -15% | -$3.82K |
|
3638
CALL
Interactive Brokers
IBKR
$40.5B
| $14K | ﹤0.01% |
1,516
-344
| -18% | -$3.2K |
|
3639
PUT
JetBlue
JBLU
$2.23B
| $14K | ﹤0.01% |
141
+65
| +86% | +$1.32K |
|
3640
CALL
ManpowerGroup
MAN
$2.58B
| $14K | ﹤0.01% |
17
-5
| -23% | -$485 |
|
3641
Marriott International
MAR
$101B
| $14K | ﹤0.01% |
159
-13,015
| -99% | -$1.13M |
|
3642
CALL
Middleby
MIDD
$6.11B
| $14K | ﹤0.01% |
24
-96
| -80% | -$13.1K |
|
3643
CALL
Martin Midstream Partners
MMLP
$93.1M
| $14K | ﹤0.01% |
+286
| New | +$5.4K |
|
3644
Novanta
NOVT
$5.04B
| $14K | ﹤0.01% |
+548
| New | +$13.4K |
|
3645
CALL
NovoCure
NVCR
$1.89B
| $14K | ﹤0.01% |
179
-73
| -29% | -$527 |
|
3646
Omnicell
OMCL
$1.96B
| $14K | ﹤0.01% |
+365
| New | +$13.5K |
|
3647
CALL
PG&E
PCG
$39.2B
| $14K | ﹤0.01% |
92
+37
| +67% | +$2.36K |
|
3648
PUT
Pacira BioSciences
PCRX
$1.05B
| $14K | ﹤0.01% |
58
-58
| -50% | -$2.51K |
|
3649
CALL
Pentair
PNR
$10.8B
| $14K | ﹤0.01% |
58
-234
| -80% | -$9.35K |
|
3650
VanEck Pharmaceutical ETF
PPH
$987M
| $14K | ﹤0.01% |
+268
| New | +$14.5K |
|
Similar funds
Simplex Trading's Q1 2017 Portfolio in Review
As of Q1 2017, Simplex Trading held 7,485 positions worth $2.31B, up 38% from $1.67B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading deployed $551M of net new capital in Q1 2017, opening 1,662 new positions and adding to 2,374 existing holdings. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 179,511 shares worth $21.7M.
By sector, the portfolio is most concentrated in Technology at 9.7% of assets, up from 7.2% a quarter earlier, followed by Communication Services and Consumer Discretionary.
On the sell side, the largest reduction was Citigroup, an estimated $21.4M trimmed.
- Simplex Trading's largest Q1 2017 buy was iShares 20+ Year Treasury Bond ETF: 179,511 shares worth $21.7M.
- Simplex Trading added most to Goldman Sachs in Q1 2017, an estimated $40.4M increase.
- Simplex Trading's biggest Q1 2017 reduction was Citigroup, cutting an estimated $21.4M.
- Simplex Trading fully exited Invesco QQQ Trust in Q1 2017, selling an estimated $14.4M.
- Simplex Trading's ten largest holdings make up 18% of its $2.31B portfolio in Q1 2017.
- Simplex Trading opened 1,662 new positions and closed 1,369 in Q1 2017.
- Simplex Trading's portfolio value rose 38% quarter-over-quarter to $2.31B.
Based on Simplex Trading's 13F filing for Q1 2017, filed 21 Apr 2017.