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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
276
PUT
Vale
VALE
$63.2B
| $41.4M | 0.04% |
1,816,000
+1,806,724
| +19,477% | +$37.8M |
|
277
CALL
McDonald's
MCD
$187B
| $41.1M | 0.04% |
+178,100
| New | +$41.4M |
|
278
CALL
3M
MMM
$89.1B
| $41M | 0.04% |
+246,974
| New | +$41.2M |
|
279
CALL
Etsy
ETSY
$7.64B
| $40.6M | 0.04% |
197,400
+195,992
| +13,920% | +$36.3M |
|
280
CALL
Carnival Corporation Ltd
CCL
$35.7B
| $40.3M | 0.04% |
+1,529,200
| New | +$42.8M |
|
281
PUT
American Express
AXP
$238B
| $40.2M | 0.04% |
243,100
+240,058
| +7,891% | +$37.6M |
|
282
PUT
Zillow
Z
$7.18B
| $40M | 0.04% |
327,400
+324,834
| +12,659% | +$39.5M |
|
|
STZ.B
283
PUT
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
| $39.9M | 0.04% |
170,500
+169,555
| +17,942% | +$39.4M |
|
284
CALL
Merck
MRK
$315B
| $39.7M | 0.04% |
1,291,800
+1,280,487
| +11,319% | +$95.2M |
|
|
SCHW
285
PUT
Charles Schwab
SCHW
$175B
| $39.7M | 0.04% |
+545,500
| New | +$38.6M |
|
286
CALL
Abbott
ABT
$175B
| $39.6M | 0.04% |
341,900
+339,278
| +12,940% | +$39.6M |
|
|
287
PUT
3M
MMM
$89.1B
| $39.6M | 0.04% |
+238,243
| New | +$39.8M |
|
288
PUT
Riot Platforms
RIOT
$8.84B
| $38.8M | 0.04% |
1,030,300
+1,023,491
| +15,031% | +$36.6M |
|
289
CALL
Norwegian Cruise Line
NCLH
$8.87B
| $38.8M | 0.04% |
1,317,600
+1,308,108
| +13,781% | +$39.4M |
|
290
PUT
PENN Entertainment
PENN
$2.8B
| $38.5M | 0.04% |
503,800
+498,760
| +9,896% | +$43M |
|
291
CALL
Lowe's Companies
LOW
$115B
| $38.4M | 0.04% |
+198,200
| New | +$38.8M |
|
292
PUT
Seagate
STX
$205B
| $38.4M | 0.04% |
+436,900
| New | +$39.4M |
|
293
PUT
DoorDash
DASH
$77.4B
| $38.1M | 0.04% |
213,800
+211,009
| +7,560% | +$30.9M |
|
|
294
Carnival Corporation Ltd
CCL
$35.7B
| $38.1M | 0.04% |
1,444,431
+278,173
| +24% | +$7.79M |
|
|
ATVI
295
CALL
DELISTED
Activision Blizzard
ATVI
| $38M | 0.04% |
398,100
+393,869
| +9,309% | +$37.3M |
|
296
CALL
NextEra Energy
NEE
$186B
| $37.7M | 0.04% |
514,200
+508,696
| +9,242% | +$38.2M |
|
|
297
CALL
American Express
AXP
$238B
| $37.3M | 0.04% |
226,000
+224,187
| +12,366% | +$35.1M |
|
|
298
NVIDIA
NVDA
$5.14T
| $37M | 0.04% |
1,847,280
+1,764,880
| +2,142% | +$28.3M |
|
|
SPLK
299
PUT
DELISTED
Splunk Inc
SPLK
| $36.8M | 0.04% |
254,700
+253,089
| +15,710% | +$32.2M |
|
300
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$422M
| $36.5M | 0.04% |
6,296
+6,294
| +314,700% | +$31.9M |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.