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
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
ZINC
376
DELISTED
HORSEHEAD HLDG CORP COM STK (DE)
ZINC
| $425K | 0.05% |
33,633
+31,848
| +1,784% | +$433K |
|
377
Jazz Pharmaceuticals
JAZZ
$15.7B
| $424K | 0.05% |
2,456
+2,335
| +1,930% | +$401K |
|
|
GAP
378
The Gap Inc
GAP
$7.07B
| $423K | 0.05% |
9,776
+5,055
| +107% | +$211K |
|
|
XONE
379
PUT
DELISTED
The ExOne Company
XONE
| $423K | 0.05% |
197
-85
| -30% | -$1.27K |
|
|
SGMO
380
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $422K | 0.05% |
26,946
+22,677
| +531% | +$351K |
|
381
PUT
Boeing
BA
$164B
| $420K | 0.05% |
+1,050
| New | +$153K |
|
382
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $420K | 0.05% |
+1,308
| New | +$233K |
|
383
GE Aerospace
GE
$354B
| $420K | 0.05% |
+3,539
| New | +$421K |
|
|
VSTO
384
DELISTED
Vista Outdoor Inc.
VSTO
| $419K | 0.05% |
+9,800
| New | +$416K |
|
385
Enterprise Products Partners
EPD
$84.1B
| $417K | 0.05% |
+12,692
| New | +$425K |
|
386
PUT
American Airlines Group
AAL
$9.78B
| $412K | 0.05% |
2,511
-559
| -18% | -$28.4K |
|
387
Five Below
FIVE
$11.3B
| $411K | 0.05% |
11,562
+8,726
| +308% | +$291K |
|
388
Duke Energy
DUK
$99.7B
| $410K | 0.05% |
+5,340
| New | +$433K |
|
389
Coca-Cola
KO
$354B
| $408K | 0.05% |
10,081
-65,949
| -87% | -$2.76M |
|
390
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$6.82B
| $405K | 0.05% |
+18,356
| New | +$405K |
|
391
Puma Biotechnology
PBYI
$401M
| $402K | 0.05% |
1,704
+595
| +54% | +$127K |
|
|
BLUE
392
CALL
DELISTED
bluebird bio
BLUE
| $401K | 0.05% |
7
-4
| -36% | -$5.28K |
|
393
iShares MSCI South Korea ETF
EWY
$22.7B
| $401K | 0.05% |
7,017
+2,448
| +54% | +$138K |
|
|
APOL
394
DELISTED
Apollo Education Group Inc Class A
APOL
| $401K | 0.05% |
21,221
-8,963
| -30% | -$237K |
|
|
LL
395
PUT
DELISTED
LL Flooring Holdings, Inc.
LL
| $400K | 0.05% |
848
+707
| +501% | +$36.2K |
|
|
ADT
396
DELISTED
ADT Corp
ADT
| $400K | 0.05% |
9,636
-4,429
| -31% | -$166K |
|
397
Bank of America
BAC
$432B
| $398K | 0.05% |
25,861
+16,361
| +172% | +$263K |
|
398
Copa Holdings
CPA
$5.66B
| $397K | 0.05% |
3,934
-8,691
| -69% | -$943K |
|
399
iShares S&P 500 Growth ETF
IVW
$74.2B
| $397K | 0.05% |
13,940
+1,940
| +16% | +$55.1K |
|
|
PXD
400
PUT
DELISTED
Pioneer Natural Resource Co.
PXD
| $397K | 0.05% |
313
-143
| -31% | -$22K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.