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 | |
|---|---|---|---|---|---|---|
326
PUT
Amgen
AMGN
$198B
| $31.4M | 0.03% |
+128,900
| New | +$31.7M |
|
327
CALL
Wynn Resorts
WYNN
$9.79B
| $31.4M | 0.03% |
256,700
+255,069
| +15,639% | +$32.5M |
|
328
PUT
Datadog
DDOG
$87.5B
| $30.8M | 0.03% |
296,200
+293,507
| +10,899% | +$26.5M |
|
329
PUT
Cloudflare
NET
$95.5B
| $30.5M | 0.03% |
287,900
+284,752
| +9,045% | +$23.6M |
|
330
PUT
Spotify
SPOT
$97.5B
| $30.5M | 0.03% |
110,500
+109,488
| +10,819% | +$27.8M |
|
331
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$153B
| $30.3M | 0.03% |
456,400
+452,734
| +12,350% | +$29.8M |
|
332
PUT
Upstart Holdings
UPST
$2.74B
| $30.3M | 0.03% |
242,600
+241,561
| +23,249% | +$29.7M |
|
333
PUT
Best Buy
BBY
$18.4B
| $30.3M | 0.03% |
+263,200
| New | +$30.7M |
|
334
CALL
Clover Health Investments
CLOV
$2.46B
| $29.8M | 0.03% |
2,238,900
+2,233,647
| +42,521% | +$21.9M |
|
335
PUT
Charter Communications
CHTR
$15.9B
| $29.7M | 0.03% |
+41,200
| New | +$27.7M |
|
336
CALL
Rio Tinto
RIO
$150B
| $29.7M | 0.03% |
353,600
+352,203
| +25,211% | +$30.3M |
|
337
CALL
BP
BP
$112B
| $29.4M | 0.03% |
+1,111,900
| New | +$29.2M |
|
|
338
Baidu
BIDU
$36.6B
| $29.4M | 0.03% |
143,944
+111,547
| +344% | +$22.3M |
|
339
PUT
eBay
EBAY
$49.3B
| $29.2M | 0.03% |
416,000
+411,364
| +8,873% | +$25.8M |
|
340
CALL
Twilio
TWLO
$27.8B
| $29.1M | 0.03% |
73,900
+72,723
| +6,179% | +$25.2M |
|
341
TSMC
TSM
$2.18T
| $29.1M | 0.03% |
242,379
+163,432
| +207% | +$19.1M |
|
342
CALL
ProShares UltraShort Health Care
RXD
$3.38M
| $29.1M | 0.03% |
773,600
+768,631
| +15,469% | +$24.6M |
|
343
PUT
Take-Two Interactive
TTWO
$43.4B
| $29.1M | 0.03% |
+164,300
| New | +$29.2M |
|
344
CALL
Royal Caribbean
RCL
$76.7B
| $29.1M | 0.03% |
+340,900
| New | +$29.7M |
|
345
CALL
PENN Entertainment
PENN
$2.8B
| $29M | 0.03% |
379,200
+375,326
| +9,688% | +$32.3M |
|
346
CALL
Seagate
STX
$205B
| $28.8M | 0.03% |
+327,800
| New | +$29.5M |
|
347
PUT
Western Digital
WDC
$192B
| $28.8M | 0.03% |
534,889
+530,810
| +13,013% | +$28.7M |
|
348
PUT
Norwegian Cruise Line
NCLH
$8.87B
| $28.6M | 0.03% |
973,600
+964,397
| +10,479% | +$29.1M |
|
349
CALL
Southwest Airlines
LUV
$23.3B
| $28.6M | 0.03% |
539,200
+536,614
| +20,751% | +$32.2M |
|
|
350
AT&T
T
$160B
| $28.5M | 0.03% |
+1,311,180
| New | +$29.8M |
|
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.