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 | |
|---|---|---|---|---|---|---|
|
UCD
26
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $4.45M | 0.52% |
1,404
+1,282
| +1,051% | +$62.9K |
|
|
27
CALL
Booking.com
BKNG
$139B
| $4.28M | 0.5% |
27,800
-7,550
| -21% | -$338K |
|
|
APC
28
DELISTED
Anadarko Petroleum
APC
| $4.08M | 0.47% |
+49,250
| New | +$4.03M |
|
29
PUT
iShares S&P 100 ETF
OEF
$20.2B
| $3.82M | 0.44% |
17,479
+16,574
| +1,831% | +$1.51M |
|
|
TRW
30
DELISTED
TRW AUTOMOTIVE HOLDINGS CORP
TRW
| $3.75M | 0.44% |
35,777
+1,249
| +4% | +$130K |
|
31
Skyworks Solutions
SWKS
$8.99B
| $3.75M | 0.44% |
38,154
+2,623
| +7% | +$224K |
|
|
PCYC
32
CALL
DELISTED
PHARMACYCLICS INC
PCYC
| $3.71M | 0.43% |
799
+642
| +409% | +$124K |
|
33
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $3.7M | 0.43% |
+13,341
| New | +$3.6M |
|
|
CELG
34
CALL
DELISTED
Celgene Corp
CELG
| $3.69M | 0.43% |
3,894
+425
| +12% | +$50.8K |
|
35
AbbVie
ABBV
$448B
| $3.69M | 0.43% |
+63,011
| New | +$3.81M |
|
|
KRFT
36
CALL
DELISTED
KRAFT FOODS GROUP INC COM STK (VA)
KRFT
| $3.58M | 0.42% |
2,362
+2,345
| +13,794% | +$155K |
|
37
Illumina
ILMN
$27.9B
| $3.58M | 0.42% |
19,809
+8,487
| +75% | +$1.6M |
|
38
CALL
Tesla
TSLA
$1.42T
| $3.56M | 0.41% |
62,820
+7,380
| +13% | +$99.6K |
|
39
CALL
Netflix
NFLX
$286B
| $3.55M | 0.41% |
183,680
-6,930
| -4% | -$42K |
|
40
Chipotle Mexican Grill
CMG
$42.5B
| $3.46M | 0.4% |
266,300
-791,700
| -75% | -$10.8M |
|
|
41
PUT
Apple
AAPL
$4.81T
| $3.43M | 0.4% |
+34,220
| New | +$1.03M |
|
42
SLB Ltd
SLB
$69.4B
| $3.37M | 0.39% |
+40,409
| New | +$3.36M |
|
43
Qualcomm
QCOM
$183B
| $3.34M | 0.39% |
48,185
+27,801
| +136% | +$1.96M |
|
|
AGN
44
CALL
DELISTED
Allergan plc
AGN
| $3.17M | 0.37% |
+1,445
| New | +$412K |
|
|
45
Netflix
NFLX
$286B
| $3.17M | 0.37% |
532,210
+513,310
| +2,716% | +$3.11M |
|
|
LNKD
46
DELISTED
LinkedIn Corporation
LNKD
| $3.16M | 0.37% |
+12,655
| New | +$3.14M |
|
47
UnitedHealth
UNH
$396B
| $3.15M | 0.37% |
26,609
+24,045
| +938% | +$2.67M |
|
48
CALL
Meta Platforms (Facebook)
META
$1.63T
| $3.13M | 0.36% |
7,283
+2,932
| +67% | +$230K |
|
49
CALL
Biogen
BIIB
$29.5B
| $3.07M | 0.36% |
642
-287
| -31% | -$113K |
|
50
Boeing
BA
$161B
| $3.06M | 0.36% |
20,423
+7,523
| +58% | +$1.1M |
|
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.