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 | |
|---|---|---|---|---|---|---|
|
GTT
2026
PUT
DELISTED
GTT Communications, Inc.
GTT
| $73K | ﹤0.01% |
+224
| New | +$6.07K |
|
2027
CALL
Agnico Eagle Mines
AEM
$72.6B
| $72K | ﹤0.01% |
663
-218
| -25% | -$9.8K |
|
2028
Astec Industries
ASTE
$1.3B
| $72K | ﹤0.01% |
+1,176
| New | +$77.9K |
|
2029
PUT
Eaton
ETN
$157B
| $72K | ﹤0.01% |
670
+366
| +120% | +$26K |
|
2030
PUT
Idexx Laboratories
IDXX
$42.9B
| $72K | ﹤0.01% |
210
+187
| +813% | +$25.8K |
|
2031
CALL
KKR & Co
KKR
$89.2B
| $72K | ﹤0.01% |
477
-99
| -17% | -$1.76K |
|
2032
CALL
Marvell Technology
MRVL
$174B
| $72K | ﹤0.01% |
433
+139
| +47% | +$2.14K |
|
2033
CALL
Parker-Hannifin
PH
$125B
| $72K | ﹤0.01% |
73
-6
| -8% | -$911 |
|
2034
CALL
PTC
PTC
$13.7B
| $72K | ﹤0.01% |
223
-371
| -62% | -$19.6K |
|
2035
CALL
Ralph Lauren
RL
$22.2B
| $72K | ﹤0.01% |
409
+299
| +272% | +$24.7K |
|
|
CALA
2036
PUT
DELISTED
Calithera Biosciences, Inc
CALA
| $72K | ﹤0.01% |
+39
| New | +$6.74K |
|
|
JCP
2037
PUT
DELISTED
J.C. Penney Company, Inc.
JCP
| $72K | ﹤0.01% |
1,479
+639
| +76% | +$4.22K |
|
|
WAGE
2038
DELISTED
WageWorks, Inc.
WAGE
| $72K | ﹤0.01% |
1,008
-539
| -35% | -$39.9K |
|
|
ATHN
2039
PUT
DELISTED
Athenahealth, Inc.
ATHN
| $72K | ﹤0.01% |
123
-222
| -64% | -$25.9K |
|
|
CZR
2040
DELISTED
Caesars Entertainment Corporation
CZR
| $72K | ﹤0.01% |
7,609
-33,594
| -82% | -$307K |
|
2041
Accuray
ARAY
$28.4M
| $71K | ﹤0.01% |
15,149
-13,549
| -47% | -$70.6K |
|
2042
CALL
Deckers Outdoor
DECK
$13.3B
| $71K | ﹤0.01% |
1,320
+1,092
| +479% | +$10.1K |
|
2043
PUT
Encore Capital Group
ECPG
$1.93B
| $71K | ﹤0.01% |
384
+245
| +176% | +$7.71K |
|
2044
PUT
Essex Property Trust
ESS
$18.9B
| $71K | ﹤0.01% |
+387
| New | +$88.8K |
|
2045
Entravision Communication
EVC
$983M
| $71K | ﹤0.01% |
+11,543
| New | +$67K |
|
2046
PUT
ICICI Bank
IBN
$106B
| $71K | ﹤0.01% |
1,451
+350
| +32% | +$2.61K |
|
|
SF
2047
CALL
Stifel
SF
$12.3B
| $71K | ﹤0.01% |
1,406
-142
| -9% | -$3.27K |
|
2048
UDR
UDR
$12.9B
| $71K | ﹤0.01% |
+1,961
| New | +$70.1K |
|
2049
iShares MSCI World ETF
URTH
$7.95B
| $71K | ﹤0.01% |
+918
| New | +$70.1K |
|
|
CXO
2050
PUT
DELISTED
CONCHO RESOURCES INC.
CXO
| $71K | ﹤0.01% |
194
+23
| +13% | +$3.1K |
|
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.