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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
251
NVIDIA
NVDA
$5.14T
| $48.6M | 0.05% |
601,100
-1,246,180
| -67% | -$25.9M |
|
252
PUT
Comcast
CMCSA
$84B
| $48.4M | 0.05% |
838,500
-9,300
| -1% | -$542K |
|
253
PUT
Enphase Energy
ENPH
$5.22B
| $48.2M | 0.05% |
263,500
+4,100
| +2% | +$704K |
|
254
CALL
Roblox
RBLX
$35.5B
| $48.1M | 0.04% |
560,000
+61,900
| +12% | +$5.08M |
|
255
CALL
Chipotle Mexican Grill
CMG
$41.3B
| $47.1M | 0.04% |
1,530,000
+75,000
| +5% | +$2.73M |
|
256
PUT
Gilead Sciences
GILD
$162B
| $47M | 0.04% |
679,600
-7,800
| -1% | -$548K |
|
257
CALL
McDonald's
MCD
$187B
| $46.9M | 0.04% |
201,900
+23,800
| +13% | +$5.68M |
|
258
PUT
Thermo Fisher Scientific
TMO
$196B
| $46.6M | 0.04% |
91,500
+300
| +0.3% | +$165K |
|
259
CALL
Bristol-Myers Squibb
BMY
$124B
| $46.5M | 0.04% |
698,700
-4,900
| -0.7% | -$323K |
|
260
CALL
Freeport-McMoran
FCX
$93.4B
| $45.9M | 0.04% |
1,238,300
+36,800
| +3% | +$1.3M |
|
261
CALL
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$156M
| $45.6M | 0.04% |
98,250
-306
| -0.3% | -$137K |
|
262
CALL
Eli Lilly
LLY
$1.04T
| $45.5M | 0.04% |
197,000
+7,300
| +4% | +$1.8M |
|
263
PUT
Lockheed Martin
LMT
$119B
| $45.5M | 0.04% |
119,600
+100
| +0.1% | +$36.2K |
|
264
PUT
RH
RH
$3.31B
| $45.3M | 0.04% |
65,600
| – | – |
|
|
265
CALL
Comcast
CMCSA
$84B
| $45.1M | 0.04% |
781,600
+27,300
| +4% | +$1.59M |
|
|
SPLK
266
PUT
DELISTED
Splunk Inc
SPLK
| $45.1M | 0.04% |
319,800
+65,100
| +26% | +$9.47M |
|
267
CALL
Vanguard S&P 500 ETF
VOO
$979B
| $45M | 0.04% |
180,900
+4,900
| +3% | +$1.99M |
|
268
CALL
PepsiCo
PEP
$185B
| $45M | 0.04% |
303,800
| – | – |
|
269
CALL
Delta Air Lines
DAL
$54.9B
| $44.8M | 0.04% |
1,013,900
+2,000
| +0.2% | +$81.6K |
|
270
CALL
Zscaler
ZS
$23B
| $44.8M | 0.04% |
209,500
-100
| -0% | -$25.1K |
|
271
CALL
Coca-Cola
KO
$354B
| $44.4M | 0.04% |
822,700
-7,400
| -0.9% | -$412K |
|
272
CALL
Twilio
TWLO
$27.8B
| $44.4M | 0.04% |
114,600
+40,700
| +55% | +$14.8M |
|
|
273
CALL
Enphase Energy
ENPH
$5.22B
| $43.8M | 0.04% |
239,200
+6,800
| +3% | +$1.17M |
|
274
CALL
Plug Power
PLUG
$3.11B
| $43.5M | 0.04% |
1,307,000
+33,200
| +3% | +$890K |
|
275
CALL
Etsy
ETSY
$7.64B
| $43.5M | 0.04% |
218,100
+20,700
| +10% | +$4.2M |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.