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 |
Alphabet (Google) Class C
GOOG
|
+$54.6M |
| 2 |
Apple
AAPL
|
+$29.1M |
| 3 |
Meta Platforms (Facebook)
META
|
+$15.7M |
| 4 |
IBM
IBM
|
+$13.8M |
| 5 |
Baidu
BIDU
|
+$10.6M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$10.1M |
| 2 |
McDonald's
MCD
|
+$8.46M |
| 3 |
Ralph Lauren
RL
|
+$5.36M |
| 4 |
Intel
INTC
|
+$5.04M |
| 5 |
WBA
Walgreens Boots Alliance
WBA
|
+$4.76M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 14.27% |
| 2 | Technology | 10.3% |
| 3 | Healthcare | 7.76% |
| 4 | Consumer Discretionary | 6.32% |
| 5 | Financials | 5.18% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
INXN
376
DELISTED
Interxion Holding N.V.
INXN
| $534K | 0.04% |
19,328
+16,272
| +532% | +$483K |
|
377
CALL
Illumina
ILMN
$28.9B
| $533K | 0.04% |
283
+136
| +93% | +$26.6K |
|
|
LL
378
PUT
DELISTED
LL Flooring Holdings, Inc.
LL
| $532K | 0.04% |
637
-211
| -25% | -$5.55K |
|
379
Domino's
DPZ
$10.6B
| $531K | 0.04% |
4,691
+4,088
| +678% | +$441K |
|
380
PUT
Caterpillar
CAT
$410B
| $529K | 0.04% |
764
-1,409
| -65% | -$121K |
|
381
JetBlue
JBLU
$1.92B
| $529K | 0.04% |
25,512
+17,940
| +237% | +$363K |
|
382
PUT
Whirlpool
WHR
$2.41B
| $528K | 0.04% |
616
+386
| +168% | +$72.5K |
|
383
CALL
eBay
EBAY
$49.3B
| $527K | 0.04% |
2,956
-1,183
| -29% | -$29.5K |
|
|
384
CALL
IBM
IBM
$193B
| $524K | 0.04% |
1,977
+650
| +49% | +$104K |
|
|
SEE
385
DELISTED
Sealed Air
SEE
| $522K | 0.04% |
10,174
+4,895
| +93% | +$235K |
|
386
PUT
Teva Pharmaceuticals
TEVA
$35.1B
| $519K | 0.04% |
1,009
+453
| +81% | +$27.9K |
|
387
CACI
CACI
$10.3B
| $513K | 0.04% |
+6,351
| New | +$552K |
|
388
PUT
iShares MSCI Australia ETF
EWA
$1.35B
| $509K | 0.04% |
2,053
+260
| +15% | +$5.92K |
|
|
QLTY
389
DELISTED
QUALITY DISTR INC FLA
QLTY
| $509K | 0.04% |
+32,943
| New | +$445K |
|
|
EXAS
390
CALL
DELISTED
Exact Sciences
EXAS
| $508K | 0.04% |
436
+228
| +110% | +$5.73K |
|
391
CALL
Citigroup
C
$222B
| $504K | 0.04% |
2,379
+1,357
| +133% | +$73.8K |
|
392
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$108M
| $503K | 0.04% |
1,862
+1,533
| +466% | +$34.7K |
|
393
PUT
Philip Morris
PM
$303B
| $503K | 0.04% |
847
+14
| +2% | +$1.15K |
|
394
United Airlines
UAL
$38.1B
| $503K | 0.04% |
+9,498
| New | +$550K |
|
395
Microchip Technology
MCHP
$46.2B
| $496K | 0.04% |
+20,934
| New | +$508K |
|
396
PUT
Halliburton
HAL
$27.6B
| $494K | 0.04% |
659
-64
| -9% | -$2.95K |
|
397
CALL
JD.com
JD
$40.7B
| $494K | 0.04% |
1,389
+1,188
| +591% | +$40.4K |
|
398
Kroger
KR
$35.3B
| $492K | 0.04% |
13,584
+8,304
| +157% | +$302K |
|
|
CHL
399
DELISTED
China Mobile Limited
CHL
| $491K | 0.04% |
7,662
+6,802
| +791% | +$465K |
|
400
Acadia Healthcare
ACHC
$3.2B
| $488K | 0.04% |
6,241
+5,585
| +851% | +$402K |
|
Similar funds
Simplex Trading's Q2 2015 Portfolio in Review
As of Q2 2015, Simplex Trading held 6,639 positions worth $1.19B, up 39% from $860M the previous quarter. Its ten largest holdings account for 20% of the portfolio.
Simplex Trading deployed $279M of net new capital in Q2 2015, opening 1,607 new positions and adding to 1,829 existing holdings. Its largest new stake was IBM: 85,948 shares worth $13.4M.
By sector, the portfolio is most concentrated in Communication Services at 14% of assets, up from 7.8% a quarter earlier, followed by Technology and Healthcare.
On the sell side, the largest reduction was Intel, an estimated $5.04M trimmed.
- Simplex Trading's largest Q2 2015 buy was IBM: 85,948 shares worth $13.4M.
- Simplex Trading added most to Alphabet (Google) Class C in Q2 2015, an estimated $54.6M increase.
- Simplex Trading's biggest Q2 2015 reduction was Intel, cutting an estimated $5.04M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q2 2015, selling an estimated $10.1M.
- Simplex Trading's ten largest holdings make up 20% of its $1.19B portfolio in Q2 2015.
- Simplex Trading opened 1,607 new positions and closed 1,438 in Q2 2015.
- Simplex Trading's portfolio value rose 39% quarter-over-quarter to $1.19B.
Based on Simplex Trading's 13F filing for Q2 2015, filed 8 Jul 2015.