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 | |
|---|---|---|---|---|---|---|
|
WPX
676
DELISTED
WPX Energy, Inc.
WPX
| $493K | 0.02% |
+36,876
| New | +$492K |
|
|
PXD
677
PUT
DELISTED
Pioneer Natural Resource Co.
PXD
| $491K | 0.02% |
798
+442
| +124% | +$82K |
|
678
PUT
McKesson
MCK
$95.3B
| $490K | 0.02% |
475
+150
| +46% | +$22K |
|
|
POT
679
PUT
DELISTED
Potash Corp Of Saskatchewan
POT
| $490K | 0.02% |
2,507
+1,384
| +123% | +$25.1K |
|
680
Apogee Enterprises
APOG
$838M
| $489K | 0.02% |
+8,212
| New | +$471K |
|
681
Lexicon Pharmaceuticals
LXRX
$999M
| $489K | 0.02% |
34,131
+27,104
| +386% | +$402K |
|
682
Suncor Energy
SU
$76.4B
| $489K | 0.02% |
+15,918
| New | +$501K |
|
683
Zillow
Z
$7.18B
| $489K | 0.02% |
+14,524
| New | +$517K |
|
684
Chord Energy
CHRD
$7.74B
| $488K | 0.02% |
+34,281
| New | +$482K |
|
|
TOUR
685
Tuniu
TOUR
$57.6M
| $488K | 0.02% |
5,576
+639
| +13% | +$56.1K |
|
686
CALL
American Tower
AMT
$77.4B
| $487K | 0.02% |
314
-24
| -7% | -$2.64K |
|
|
687
CALL
Eli Lilly
LLY
$1.04T
| $487K | 0.02% |
1,814
-520
| -22% | -$41.6K |
|
688
WEX
WEX
$5.4B
| $487K | 0.02% |
+4,706
| New | +$522K |
|
689
CALL
FMC
FMC
$1.48B
| $486K | 0.02% |
655
+552
| +536% | +$28.5K |
|
|
NE
690
DELISTED
Noble Corporation
NE
| $486K | 0.02% |
78,671
+40,936
| +108% | +$276K |
|
691
Safety Insurance
SAFT
$1.06B
| $485K | 0.02% |
6,930
-1,606
| -19% | -$115K |
|
692
Karyopharm Therapeutics
KPTI
$163M
| $484K | 0.02% |
+2,516
| New | +$404K |
|
|
AIRM
693
DELISTED
Air Methods Corp
AIRM
| $483K | 0.02% |
11,238
+7,998
| +247% | +$309K |
|
694
Nexstar Media Group
NXST
$5.55B
| $479K | 0.02% |
6,835
-4,796
| -41% | -$321K |
|
|
FBC
695
DELISTED
Flagstar Bancorp, Inc. New
FBC
| $478K | 0.02% |
16,959
+16,058
| +1,782% | +$437K |
|
696
CALL
EOG Resources
EOG
$76.7B
| $477K | 0.02% |
727
-471
| -39% | -$47K |
|
697
PUT
Visa
V
$672B
| $477K | 0.02% |
3,104
+242
| +8% | +$20.8K |
|
698
CALL
Caterpillar
CAT
$410B
| $476K | 0.02% |
3,682
+1,013
| +38% | +$95.9K |
|
699
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$6.82B
| $476K | 0.02% |
15,080
-55,676
| -79% | -$1.68M |
|
700
Ubiquiti
UI
$32.5B
| $475K | 0.02% |
+9,460
| New | +$517K |
|
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.