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 | |
|---|---|---|---|---|---|---|
4451
CALL
Opko Health
OPK
$1.25B
| $6K | ﹤0.01% |
479
-218
| -31% | -$1.83K |
|
4452
CALL
Pacific Biosciences
PACB
$432M
| $6K | ﹤0.01% |
212
+14
| +7% | +$69 |
|
|
PDS
4453
Precision Drilling
PDS
$1.01B
| $6K | ﹤0.01% |
69
+26
| +60% | +$2.73K |
|
4454
PUT
PetMed Express
PETS
$43M
| $6K | ﹤0.01% |
+170
| New | +$3.6K |
|
4455
PUT
PhenixFIN
PFX
$83M
| $6K | ﹤0.01% |
12
-1
| -8% | -$153 |
|
4456
PUT
Dave & Buster's
PLAY
$361M
| $6K | ﹤0.01% |
275
+162
| +143% | +$9.23K |
|
4457
PUT
Plug Power
PLUG
$2.73B
| $6K | ﹤0.01% |
35
-5
| -13% | -$6 |
|
4458
CALL
Plexus
PLXS
$6.69B
| $6K | ﹤0.01% |
37
+2
| +6% | +$111 |
|
4459
CALL
Ryder
R
$9.98B
| $6K | ﹤0.01% |
53
+20
| +61% | +$1.51K |
|
4460
CALL
LiveRamp
RAMP
$2.29B
| $6K | ﹤0.01% |
66
-114
| -63% | -$3.17K |
|
4461
CALL
RPC Inc
RES
$1.14B
| $6K | ﹤0.01% |
88
-157
| -64% | -$3.17K |
|
4462
Radiant Logistics
RLGT
$411M
| $6K | ﹤0.01% |
+1,200
| New | +$5.53K |
|
|
4463
PUT
Radiant Logistics
RLGT
$411M
| $6K | ﹤0.01% |
+14
| New | +$64 |
|
4464
CALL
ResMed
RMD
$30.3B
| $6K | ﹤0.01% |
28
-213
| -88% | -$14.7K |
|
4465
Red Rock Resorts
RRR
$3.87B
| $6K | ﹤0.01% |
298
+289
| +3,211% | +$6.6K |
|
4466
PUT
Rush Enterprises Class A
RUSHA
$6.13B
| $6K | ﹤0.01% |
+34
| New | +$503 |
|
4467
CALL
Rayonier Advanced Materials
RYAM
$591M
| $6K | ﹤0.01% |
106
+32
| +43% | +$449 |
|
|
RYZ
4468
CALL
Ryerson Holding Corp
RYZ
$1.61B
| $6K | ﹤0.01% |
+27
| New | +$307 |
|
4469
PUT
Sasol
SSL
$7.03B
| $6K | ﹤0.01% |
+83
| New | +$2.42K |
|
4470
STAAR Surgical
STAA
$1.13B
| $6K | ﹤0.01% |
620
-17,611
| -97% | -$176K |
|
4471
PUT
STAG Industrial
STAG
$7.79B
| $6K | ﹤0.01% |
157
-21
| -12% | -$512 |
|
4472
Telkom Indonesia
TLK
$14.2B
| $6K | ﹤0.01% |
204
-59
| -22% | -$1.74K |
|
4473
PUT
Trustmark
TRMK
$2.74B
| $6K | ﹤0.01% |
+21
| New | +$696 |
|
4474
CALL
Take-Two Interactive
TTWO
$46B
| $6K | ﹤0.01% |
62
-49
| -44% | -$2.74K |
|
4475
PUT
Uranium Energy
UEC
$4.67B
| $6K | ﹤0.01% |
36
+26
| +260% | +$39 |
|
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.