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 |
Alibaba
BABA
|
+$39.9M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$39M |
| 3 |
Mastercard
MA
|
+$31.3M |
| 4 |
Apple
AAPL
|
+$25.3M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$25.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
JPMorgan Chase
JPM
|
+$52.8M |
| 2 |
TSMC
TSM
|
+$43M |
| 3 |
Amazon
AMZN
|
+$24.7M |
| 4 |
iShares Silver Trust
SLV
|
+$24.2M |
| 5 |
Netflix
NFLX
|
+$21.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.69% |
| 2 | Consumer Discretionary | 0.65% |
| 3 | Technology | 0.38% |
| 4 | Healthcare | 0.33% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
276
PUT
NetEase
NTES
$76.4B
| $27.9M | 0.04% |
2,912
+1,322
| +83% | +$119K |
|
277
CALL
CSX Corp
CSX
$91.5B
| $27.8M | 0.04% |
9,195
+6,330
| +221% | +$182K |
|
278
PUT
Datadog
DDOG
$76.5B
| $27.5M | 0.04% |
2,793
-622
| -18% | -$62.1K |
|
279
PUT
Blackrock
BLK
$174B
| $27.3M | 0.04% |
379
-197
| -34% | -$131K |
|
280
AutoZone
AZO
$48.7B
| $27.3M | 0.04% |
23,056
+3,682
| +19% | +$4.26M |
|
281
CALL
Bristol-Myers Squibb
BMY
$136B
| $27.3M | 0.04% |
4,404
-2,292
| -34% | -$141K |
|
282
CALL
Etsy
ETSY
$7.02B
| $27M | 0.04% |
1,517
+373
| +33% | +$56.1K |
|
283
PUT
RH
RH
$2.8B
| $27M | 0.04% |
603
+104
| +21% | +$42.9K |
|
284
CALL
Eli Lilly
LLY
$1.02T
| $26.9M | 0.03% |
1,596
+983
| +160% | +$147K |
|
285
CALL
PepsiCo
PEP
$188B
| $26.9M | 0.03% |
1,817
-2,285
| -56% | -$325K |
|
|
B
286
PUT
Barrick Mining
B
$73.7B
| $26.8M | 0.03% |
11,784
-3,238
| -22% | -$82K |
|
287
PUT
Thermo Fisher Scientific
TMO
$227B
| $26.7M | 0.03% |
574
+265
| +86% | +$124K |
|
288
PUT
XPeng
XPEV
$10.5B
| $26.5M | 0.03% |
6,191
+5,739
| +1,270% | +$211K |
|
289
PUT
Linde
LIN
$220B
| $26.5M | 0.03% |
1,006
+370
| +58% | +$90.8K |
|
|
WORK
290
PUT
DELISTED
Slack Technologies, Inc.
WORK
| $26.5M | 0.03% |
6,265
-4,366
| -41% | -$148K |
|
291
PUT
Charter Communications
CHTR
$18.1B
| $26.5M | 0.03% |
400
+43
| +12% | +$27.4K |
|
292
PUT
Plug Power
PLUG
$3.03B
| $26.5M | 0.03% |
7,803
+5,178
| +197% | +$117K |
|
293
PUT
Freeport-McMoran
FCX
$104B
| $26.5M | 0.03% |
10,167
+2,235
| +28% | +$46.5K |
|
294
CALL
PENN Entertainment
PENN
$2.29B
| $26.1M | 0.03% |
3,022
-1,822
| -38% | -$130K |
|
|
295
CALL
Thermo Fisher Scientific
TMO
$227B
| $26.1M | 0.03% |
560
+90
| +19% | +$42.2K |
|
296
PUT
Ulta Beauty
ULTA
$24.1B
| $26.1M | 0.03% |
908
-2
| -0.2% | -$506 |
|
297
CALL
NextEra Energy
NEE
$174B
| $26.1M | 0.03% |
5,304
+500
| +10% | +$37.4K |
|
298
PUT
Skyworks Solutions
SWKS
$11.1B
| $26M | 0.03% |
1,702
+345
| +25% | +$50.5K |
|
299
CALL
Vale
VALE
$65B
| $25.9M | 0.03% |
15,468
+2,511
| +19% | +$33.5K |
|
300
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.5B
| $25.9M | 0.03% |
617
+35
| +6% | +$13.5K |
|
Similar funds
Simplex Trading's Q4 2020 Portfolio in Review
As of Q4 2020, Simplex Trading held 9,568 positions worth $77.2B, up 5% from $73.5B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading's Q4 2020 filing shows 1,710 new, 3,401 increased, 3,105 reduced and 1,157 closed positions. Its largest new stake was Alibaba: 143,630 shares worth $33.4M. The largest sale was JPMorgan Chase, an estimated $52.8M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2020 buy was Alibaba: 143,630 shares worth $33.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q4 2020, an estimated $39M increase.
- Simplex Trading's biggest Q4 2020 reduction was JPMorgan Chase, cutting an estimated $52.8M.
- Simplex Trading fully exited Target in Q4 2020, selling an estimated $14.3M.
- Simplex Trading's ten largest holdings make up 42% of its $77.2B portfolio in Q4 2020.
- Simplex Trading opened 1,710 new positions and closed 1,157 in Q4 2020.
- Simplex Trading's portfolio value rose 5% quarter-over-quarter to $77.2B.
Based on Simplex Trading's 13F filing for Q4 2020, filed 2 Feb 2021.