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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
301
CALL
Northrop Grumman
NOC
$74.6B
| $18.3M | 0.04% |
532
-158
| -23% | -$55.6K |
|
|
SPLK
302
PUT
DELISTED
Splunk Inc
SPLK
| $18.3M | 0.04% |
1,220
+75
| +7% | +$9.85K |
|
303
CALL
Morgan Stanley
MS
$343B
| $18.3M | 0.04% |
3,572
+1,700
| +91% | +$80.5K |
|
|
HES
304
PUT
DELISTED
Hess
HES
| $18.2M | 0.04% |
2,730
+946
| +53% | +$61.9K |
|
305
CALL
Pfizer
PFE
$141B
| $18.1M | 0.04% |
4,880
-2,343
| -32% | -$83.5K |
|
306
PUT
HCA Healthcare
HCA
$82.5B
| $17.9M | 0.04% |
1,209
+363
| +43% | +$48.7K |
|
307
PUT
Oracle
ORCL
$362B
| $17.9M | 0.04% |
3,373
-19
| -0.6% | -$1.05K |
|
|
SCHW
308
CALL
Charles Schwab
SCHW
$175B
| $17.7M | 0.04% |
3,728
+1,446
| +63% | +$63.7K |
|
309
CALL
Pinduoduo
PDD
$119B
| $17.7M | 0.04% |
4,685
+3,267
| +230% | +$122K |
|
310
PUT
Palo Alto Networks
PANW
$273B
| $17.5M | 0.04% |
4,548
-474
| -9% | -$17.9K |
|
311
PUT
Illinois Tool Works
ITW
$78.8B
| $17.5M | 0.04% |
973
+380
| +64% | +$64.4K |
|
312
iShares MSCI EAFE ETF
EFA
$77.1B
| $17.5M | 0.04% |
+251,515
| New | +$17M |
|
313
PUT
RingCentral
RNG
$3.16B
| $17.4M | 0.04% |
1,030
+795
| +338% | +$131K |
|
314
CALL
PNC Financial Services
PNC
$101B
| $17.4M | 0.04% |
1,088
+221
| +25% | +$33.2K |
|
315
CALL
Deere & Co
DE
$164B
| $17.3M | 0.04% |
998
-803
| -45% | -$138K |
|
316
PUT
CSX Corp
CSX
$92.8B
| $17.1M | 0.04% |
7,098
+651
| +10% | +$15.4K |
|
|
317
PUT
PNC Financial Services
PNC
$101B
| $17.1M | 0.04% |
1,072
+647
| +152% | +$97.1K |
|
318
PUT
DuPont de Nemours
DD
$18.9B
| $16.9M | 0.04% |
2,200
+586
| +36% | +$48.6K |
|
|
RDS.A
319
CALL
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $16.8M | 0.04% |
2,828
-904
| -24% | -$52.8K |
|
320
PUT
ProShares Ultra S&P500
SSO
$8.02B
| $16.8M | 0.04% |
10,200
+4,112
| +68% | +$70.8K |
|
|
PXD
321
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $16.7M | 0.04% |
1,103
+582
| +112% | +$77.5K |
|
|
WBA
322
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $16.7M | 0.04% |
2,825
+1,127
| +66% | +$65K |
|
|
ETFC
323
PUT
DELISTED
E*Trade Financial Corporation
ETFC
| $16.6M | 0.04% |
3,651
+1,772
| +94% | +$75.7K |
|
324
CALL
Align Technology
ALGN
$12.4B
| $16.5M | 0.04% |
592
-613
| -51% | -$153K |
|
|
XYZ
325
CALL
Block Inc
XYZ
$46.1B
| $16.5M | 0.04% |
2,636
-1,597
| -38% | -$102K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.