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
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2376
CALL
SL Green Realty
SLG
$3.88B
| $427K | ﹤0.01% |
56
+49
| +700% | +$4.33K |
|
2377
CALL
Dana Inc
DAN
$2.91B
| $426K | ﹤0.01% |
313
+306
| +4,371% | +$4.64K |
|
2378
PUT
Oxford Industries
OXM
$577M
| $426K | ﹤0.01% |
+60
| New | +$4.86K |
|
|
NBIS
2379
Nebius Group N.V.
NBIS
$47.7B
| $426K | ﹤0.01% |
15,596
-67,764
| -81% | -$1.99M |
|
|
ICPT
2380
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $426K | ﹤0.01% |
4,231
-7,271
| -63% | -$754K |
|
2381
PUT
Banc of California
BANC
$3.28B
| $425K | ﹤0.01% |
320
+251
| +364% | +$4.08K |
|
2382
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $425K | ﹤0.01% |
128
-365
| -74% | -$11.5K |
|
2383
PUT
Suburban Propane Partners
SPH
$1.23B
| $425K | ﹤0.01% |
221
+186
| +531% | +$4.18K |
|
2384
Watsco Inc
WSO
$14.9B
| $425K | ﹤0.01% |
3,056
+2,945
| +2,653% | +$449K |
|
|
XEC
2385
CALL
DELISTED
CIMAREX ENERGY CO
XEC
| $425K | ﹤0.01% |
69
+13
| +23% | +$1.07K |
|
|
DERM
2386
CALL
DELISTED
Dermira, Inc.
DERM
| $425K | ﹤0.01% |
592
+402
| +212% | +$4.4K |
|
|
BKS
2387
CALL
DELISTED
Barnes & Noble
BKS
| $425K | ﹤0.01% |
600
-301
| -33% | -$2.01K |
|
2388
Koppers
KOP
$966M
| $423K | ﹤0.01% |
24,861
+19,137
| +334% | +$450K |
|
2389
Melco Resorts & Entertainment
MLCO
$2.1B
| $423K | ﹤0.01% |
24,058
-18,757
| -44% | -$334K |
|
|
EPAY
2390
DELISTED
Bottomline Technologies Inc
EPAY
| $423K | ﹤0.01% |
8,824
+8,180
| +1,270% | +$473K |
|
2391
PUT
Infosys
INFY
$45B
| $421K | ﹤0.01% |
443
+159
| +56% | +$1.52K |
|
2392
CALL
Repligen
RGEN
$7.44B
| $421K | ﹤0.01% |
80
-245
| -75% | -$14.4K |
|
2393
Usana Health Sciences
USNA
$394M
| $420K | ﹤0.01% |
+3,568
| New | +$413K |
|
2394
PUT
Weis Markets
WMK
$1.82B
| $420K | ﹤0.01% |
88
+73
| +487% | +$3.31K |
|
2395
CALL
Kinross Gold
KGC
$28.5B
| $419K | ﹤0.01% |
1,295
+1,289
| +21,483% | +$3.61K |
|
2396
PUT
MKS Inc
MKSI
$22.2B
| $419K | ﹤0.01% |
65
-74
| -53% | -$5.35K |
|
2397
Ovintiv
OVV
$17.5B
| $419K | ﹤0.01% |
14,509
+2,534
| +21% | +$109K |
|
|
UN
2398
PUT
DELISTED
Unilever NV New York Registry Shares
UN
| $419K | ﹤0.01% |
78
-289
| -79% | -$15.8K |
|
2399
CALL
Generac Holdings
GNRC
$11.9B
| $417K | ﹤0.01% |
84
-32
| -28% | -$1.72K |
|
2400
PUT
Voya Financial
VOYA
$8.94B
| $417K | ﹤0.01% |
104
-219
| -68% | -$9.73K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.