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 |
iShares Russell 2000 ETF
IWM
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 65.37% |
| 2 | Healthcare | 6.71% |
| 3 | Communication Services | 4.77% |
| 4 | Technology | 4.7% |
| 5 | Consumer Discretionary | 4.67% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1776
CALL
United Rentals
URI
$63.2B
| $66K | ﹤0.01% |
802
+416
| +108% | +$28.9K |
|
1777
PUT
NCR Voyix
VYX
$1.19B
| $66K | ﹤0.01% |
280
-375
| -57% | -$6.25K |
|
1778
Waste Management
WM
$86.9B
| $66K | ﹤0.01% |
1,339
-1,012
| -43% | -$50.4K |
|
|
CIE
1779
PUT
DELISTED
Cobalt International Energy, Inc
CIE
| $66K | ﹤0.01% |
16
+11
| +220% | +$1.34K |
|
1780
CALL
American Tower
AMT
$82.8B
| $65K | ﹤0.01% |
601
+379
| +171% | +$35.7K |
|
|
TDAY
1781
USA Today Co
TDAY
$953M
| $65K | ﹤0.01% |
4,236
+488
| +13% | +$7.83K |
|
1782
ProShares UltraShort Gold
GLL
$87.9M
| $65K | ﹤0.01% |
153
+115
| +303% | +$48.9K |
|
1783
PUT
W.W. Grainger
GWW
$60.3B
| $65K | ﹤0.01% |
43
-172
| -80% | -$38.6K |
|
1784
CALL
International Paper
IP
$19.6B
| $65K | ﹤0.01% |
257
-286
| -53% | -$12.1K |
|
1785
iShares Core S&P 500 ETF
IVV
$872B
| $65K | ﹤0.01% |
+342
| New | +$69.8K |
|
1786
CALL
Ralph Lauren
RL
$20.9B
| $65K | ﹤0.01% |
262
-27
| -9% | -$3.21K |
|
1787
PUT
Timken Company
TKR
$8.57B
| $65K | ﹤0.01% |
170
+168
| +8,400% | +$5.36K |
|
1788
PUT
VirnetX Holding Corp
VHC
$46.8M
| $65K | ﹤0.01% |
18
+7
| +64% | +$558 |
|
|
AKS
1789
DELISTED
AK Steel Holding Corp
AKS
| $65K | ﹤0.01% |
27,210
+26,204
| +2,605% | +$76.3K |
|
|
HIFR
1790
PUT
DELISTED
InfraREIT, Inc.
HIFR
| $65K | ﹤0.01% |
+164
| New | +$4.8K |
|
|
JIVE
1791
DELISTED
Jive Software, Inc.
JIVE
| $65K | ﹤0.01% |
+13,958
| New | +$64.6K |
|
1792
PUT
CSX Corp
CSX
$91.5B
| $64K | ﹤0.01% |
1,077
-744
| -41% | -$7.3K |
|
|
EA
1793
CALL
DELISTED
Electronic Arts
EA
| $64K | ﹤0.01% |
336
+177
| +111% | +$12.4K |
|
|
LNW
1794
DELISTED
Light & Wonder
LNW
| $64K | ﹤0.01% |
+6,185
| New | +$81.1K |
|
1795
Titan Machinery
TITN
$577M
| $64K | ﹤0.01% |
+5,597
| New | +$76.1K |
|
|
SINA
1796
CALL
DELISTED
Sina Corp
SINA
| $64K | ﹤0.01% |
701
-17
| -2% | -$686 |
|
|
QLTI
1797
PUT
DELISTED
QLT Inc
QLTI
| $64K | ﹤0.01% |
288
-180
| -38% | -$660 |
|
1798
CALL
Elevance Health
ELV
$87B
| $63K | ﹤0.01% |
262
-276
| -51% | -$41.5K |
|
1799
PUT
ICICI Bank
IBN
$106B
| $63K | ﹤0.01% |
811
+743
| +1,093% | +$6.34K |
|
1800
PUT
Insmed
INSM
$27.3B
| $63K | ﹤0.01% |
+200
| New | +$4.99K |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading withdrew a net $47.8M in Q3 2015, closing 1,420 positions and reducing 1,391 holdings. Its most notable exit was IBM, an estimated $12.7M position sold in full.
By sector, the portfolio is most concentrated in Miscellaneous at 65% of assets, up from 42% a quarter earlier, followed by Healthcare and Communication Services.
Against the trend, Simplex Trading opened a new position in iShares Russell 2000 ETF worth $27.5M.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.